JP5691856B2 - Ventilation valve support structure for blow-by gas processing equipment - Google Patents

Description

  The present invention relates to a blow-by gas processing apparatus that performs a process for returning blow-by gas generated inside an internal combustion engine to an intake system, and supports a ventilation valve that adjusts the return amount of the blow-by gas to the intake system. The present invention relates to a ventilation valve support structure of a gas processing device.

  Conventionally, as this type of blow-by gas processing device (reduction device), for example, there is one described in Patent Document 1. In the blow-by gas processing apparatus described in Patent Document 1, the vent valve and the internal combustion engine are warmed to support the vent valve generally called a PCV (positive crankcase ventilation) valve. The hose through which the cooling water passes is connected by a heat transfer member. That is, by transmitting the heat of the cooling water to the ventilation valve, a situation in which the ventilation valve freezes due to moisture contained in the blow-by gas is avoided.

Japanese Patent Laid-Open No. 10-121937

  Incidentally, the blow-by gas processing device described in Patent Document 1 has a structure in which an intake device (intake passage) is disposed immediately above a cylinder head cover of an internal combustion engine, and the ventilation valve is incorporated between the overlapping cylinder head cover and the intake device. It has become. For this reason, whether the heat transfer member is attached to the ventilation valve or the cooling water hose is attached to the heat transfer member, not only the relationship between the cylinder head cover and the intake device but also the ventilation valve Ensuring the accuracy of the heat transfer member and the alignment of the heat transfer member and the cooling water hose cannot be ignored. Therefore, the work itself related to the assembly of the ventilation valve has to be complicated.

  On the other hand, many of such blow-by gas processing apparatuses are provided with an oil separator that separates an oil component and a gas component, and a ventilation valve is attached through the oil separator. Moreover, in recent years, the oil separator and the ventilation valve tend to be formed of a resin material with the aim of reducing the weight and cost, and heat transfer itself to the ventilation valve is becoming difficult.

  The present invention has been made in view of such circumstances, and its purpose is to improve positioning while ensuring heat transfer to the ventilation valve, even when an oil separator and a ventilation valve made of a resin material are used. An object of the present invention is to provide a ventilation valve support structure for a blow-by gas processing apparatus that can be easily assembled with a high degree of freedom.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The invention according to claim 1 is a blow-by gas processing apparatus that performs a process of returning blow-by gas generated inside an internal combustion engine to an intake system of the engine through an oil separator and a ventilation valve, and the ventilation valve is A ventilation valve support structure for a blow-by gas processing device supported by an oil separator, comprising a metal washer portion sandwiched between the oil separator and the ventilation valve, and an interior of the internal combustion engine connected to the washer portion. The metal pipe part to which the hot water hose through which the circulated cooling water passes is connected, and the washer part attachment surface of the oil separator are bent at least at two locations so as to be able to expand and contract in a direction perpendicular to and parallel to the direction. it, one is connected to the washer part with the other takes on the mounting surface of the oil separator body Through a support and a metallic flexible bracket that is, the gist that to support the ventilation valve to the oil separator.

According to the above configuration, since the heat of the cooling water is transmitted to the ventilation valve through the support, it is possible to suppress the ventilation valve from being frozen by moisture contained in the blowby gas. In addition, since the variation in positioning in two directions can be absorbed by expansion and contraction of the flexible bracket portion, even if there are variations due to manufacturing tolerances etc. in the support and oil separator, these variations are absorbed. Thus, the support, the oil separator, and the ventilation valve can be easily assembled. That is, the oil separator and the ventilation valve can be easily assembled with a higher degree of freedom in positioning and the like while ensuring heat transfer to the ventilation valve without changing the specification of the ventilation valve.

According to a second aspect of the present invention, in the ventilation valve support structure of the blow-by gas processing apparatus according to the first aspect, the flexible bracket portion is formed so that the plate thickness thereof is thinner than the plate thickness of the washer portion. Is the gist.

  According to the said structure, since it is suppressed that the heat from a cooling water is transmitted to the flexible bracket part side, the amount of heat transmitted to a washer part side increases, and efficient heat transfer to a ventilation valve is attained.

According to a third aspect of the present invention, in the ventilation valve support structure of the blow-by gas processing device according to the first or second aspect, a protrusion is formed at a lower portion of the washer portion mounting surface of the oil separator. The gist of the present invention is that a claw portion that is engaged with the protruding piece is formed at a lower portion of a portion of the washer portion that is in contact with the oil separator.

According to the said structure, positioning of the support body with respect to an oil separator is made appropriately, and an assembly | attachment can be performed more easily.
Invention of Claim 4 is the ventilation valve support structure of the blowby gas processing apparatus as described in any one of Claims 1-3. WHEREIN: The said flexible bracket part is attached to the said oil separator from the attachment surface of the main body. The support attachment part for attachment is extended in the shape of a tongue piece, The tip guide part contacted to the attachment part tip of the flexible bracket part is provided in the support attachment part And

  According to the said structure, when installing the flexible bracket part of a support body in the support body attaching part of an oil separator, a moderation feeling (click feeling) is produced and it can attach now easily.

According to a fifth aspect of the present invention, in the ventilation valve support structure of the blow-by gas processing device according to the fourth aspect , the support attachment portion is a side portion that is in contact with the attachment portion side portion of the flexible bracket portion. The gist is that a guide portion is further provided.

  According to the said structure, the flexible bracket part of a support body will be guided also including the side part, and it will become possible to attach the flexible bracket part still more easily.

Invention of Claim 6 makes it a summary for the ventilation valve support structure of the blowby gas processing apparatus as described in any one of Claims 1 to 5 , wherein the oil separator and the ventilation valve are made of a resin material. .

  According to the above configuration, the oil separator and the ventilation valve can be easily manufactured, and even if they are made of a resin material, ventilation is appropriately performed due to the presence of the support including the metal washer and the pipe. Heat transfer to the valve can be performed.

The perspective view which shows the whole structure about one Embodiment of the ventilation valve support structure of the blowby gas processing apparatus concerning this invention. The perspective view which decomposes | disassembles and shows the whole structure about the ventilation valve support structure of the blowby gas processing apparatus of the embodiment. About the ventilation valve support structure of the blow-by gas processing apparatus of the embodiment, (a) is a side view showing the side structure of the support, (b) is a front view showing the front structure of the support, and (c) is The top view which shows the planar structure of a support body. The perspective view which shows the perspective structure of a flexible bracket part about the ventilation valve support structure of the blowby gas processing apparatus of the embodiment. (A) is a side view showing its side structure, (b) is a front view showing its front structure, and (c) is a perspective view showing its perspective structure. . Sectional drawing which shows the cross-sectional structure about the ventilation valve support structure of the blowby gas processing apparatus of the embodiment.

  Hereinafter, an embodiment of a ventilation valve support structure of a blow-by gas processing apparatus according to the present invention will be described with reference to FIGS. First, with reference to FIG. 1, FIG. 2, the whole structure of the ventilation valve support structure of the blowby gas processing apparatus concerning this embodiment is demonstrated.

  As shown in FIG. 1, in this embodiment, an oil separator 20 made of a resin material is installed on an upper portion of a cylinder head cover 10 of an internal combustion engine, and a ventilation valve 30 made of a resin material is also fitted and supported on the oil separator 20. Has been. Further, an intake system hose 40 connected to the intake system of the internal combustion engine is connected to the ventilation valve 30. Thereby, the blow-by gas containing unburned gas leaked from the combustion chamber in the internal combustion engine is separated from the oil component by the oil separator 20, and the flow rate is adjusted by the ventilation valve 30, and the internal combustion engine passes through the intake system hose 40. Is recirculated to the intake system and recombusted in the combustion chamber.

  In this embodiment, as shown in FIG. 2, a metal support 50 is sandwiched between the oil separator 20 and the ventilation valve 30. Connected to the support 50 is a hot water hose 60 through which the cooling water heated through the internal combustion engine passes, whereby the heat of the cooling water is transferred to the ventilation valve 30 through the support 50. .

Then, the structure of this support body 50 is demonstrated in detail with reference to FIG. 3, FIG.
As shown in FIG. 3, the support body 50 is configured by integrally forming a washer portion 51, a pipe portion 52, and a flexible bracket portion 53. The washer portion 51 has a circular portion 51a that is a circular portion sandwiched between the oil separator 20 and the ventilation valve 30, and two claw portions 51b for positioning protrude obliquely below the circular portion 51a. Is formed. A connecting portion 51c extends downward from the circular portion 51a, and the washer portion 51 is in contact with the pipe portion 52 and the flexible bracket portion 53 at the connecting portion 51c.

  On the other hand, the pipe part 52 consists of a U-shaped pipe, and both U-shaped tips are connected to the above-mentioned hot water hose 60. Therefore, the cooling water flows from the hot water hose 60 through the pipe portion 52 and flows again to the hot water hose 60.

  Further, the flexible bracket portion 53 is formed so that its plate thickness is thinner than that of the washer portion 51. The shape of the flexible bracket portion 53 will be described in detail with reference to FIG.

  As shown in FIG. 4, the flexible bracket portion 53 is formed by bending a metal plate, the upper portion thereof is a connecting portion 53 a that contacts the washer portion 51, and the lower portion thereof is an attachment portion 53 b that is attached to the oil separator 20. . And between this connection part 53a and the attachment part 53b, the bending process is carried out at two places. The attachment portion 53b is formed with a bolt hole 53c, which is a bolt fastening hole with the oil separator 20 and the cylinder head cover 10, and a positioning groove portion 53d.

  Next, the operation of the ventilation valve support structure of this embodiment configured as described above will be described with reference to FIGS. First, the manner of assembling the oil separator 20 and the support 50 will be described with reference to FIG.

  A support attachment portion 21 for attaching the support 50 to the oil separator 20 is extended in the form of a tongue piece from the attachment surface of the oil separator 20 main body to the cylinder head cover 10. The mounting portion 53 b of the flexible bracket portion 53 described above is installed on the support body mounting portion 21.

  At this time, according to the shape of the attachment portion 53b of the flexible bracket portion 53, the support attachment portion 21 is in contact with the tip guide portion 21a that is in contact with the tip of the attachment portion 53b, and both sides of the attachment portion 53b. The side guide portion 21b to be formed is formed in a step shape. Further, the tip guide portion 21a is formed with a protrusion 21c corresponding to the above-described groove portion 53d formed in the attachment portion 53b. Thereby, when installing the flexible bracket part 53 on the support body attaching part 21, a feeling of moderation (click feeling) is born at the time of assembling by arranging the attaching part 53b along the tip guide part 21a and the side part guide part 21b. It can be easily attached.

  Further, the washer portion 51 of the support 50 is attached to the washer portion attachment surface 22 of the oil separator 20. At this time, two protrusions 22a are formed at the lower part of the washer part mounting surface 22, and the claw part 51b of the washer part 51 described above is engaged with the protrusions 22a so that the circular shape of the washer part 51 is obtained. Positioning of the part 51a and the opening 22b of the oil separator 20 is performed. Here, since the flexible bracket portion 53 has a shape bent at two locations as described above, the washer portion mounting surface 22 of the oil separator 20 is orthogonal to and parallel to the direction (FIG. 5 ( Expansion and contraction is possible in two directions (directions indicated by arrows in a). Therefore, even if there are variations due to manufacturing tolerances or the like in the oil separator 20 or the support 50, the variations are absorbed by expansion and contraction, and the oil separator 20 and the support 50 can be easily aligned, that is, the oil separator 20. The opening 22b of the washer 51 and the circular portion 51a of the washer 51 can be aligned. Further, since the claw portion 51b of the washer portion 51 is formed obliquely with respect to the expansion / contraction direction, the positioning is also appropriately performed.

As shown in FIG. 6, the ventilation valve 30, the intake system hose 40, the hot water hose 60, and the like are further assembled to the oil separator 20 and the support body 50 assembled in this way.
The ventilation valve 30 is fitted into the opening 22b of the oil separator 20 through the O-ring 31 from the support 50 side. In this embodiment, the washer portion 51 of the support 50 is formed by punching with a press machine, and the punching direction is the same as the insertion direction of the ventilation valve 30. As a result, no burr is formed on the side of the ventilation valve 30 of the washer portion 51. Therefore, when the ventilation valve 30 is fitted to the oil separator 20, the O-ring 31 is not damaged at the time of insertion.

  Further, in such a support structure of the ventilation valve 30, the flexible bracket portion 53 of the support body 50 supports the loads of the oil separator 20, the ventilation valve 30, the intake system hose 40, the hot water hose 60 and the like through the washer portion 51. Further, the reliability for fixing the oil separator 20 and the ventilation valve 30 is improved.

  In the ventilation valve support structure of the blow-by gas processing apparatus of this embodiment configured as described above, the cooling water heated by circulating through the internal combustion engine passes through the hot water hose 60 and enters the pipe portion 52 of the support body 50. Therefore, the heat of the cooling water is transmitted to the ventilation valve 30 through the washer portion 51. Therefore, the ventilation valve 30 is warmed, and the ventilation valve 30 can be prevented from freezing due to moisture contained in the blow-by gas.

  At this time, since the plate thickness of the flexible bracket portion 53 is thinner than that of the washer portion 51 of the support body 50, heat from the cooling water is prevented from being transmitted to the flexible bracket portion 53 side, and the ventilation valve Efficient heat transfer to 30 is possible.

As described above, according to the ventilation valve support structure of the blow-by gas processing apparatus according to this embodiment, the effects listed below can be obtained.
(1) The ventilation valve 30 is supported by the oil separator 20 via the metal support 50. In particular, the washer part 51 sandwiched between the oil separator 20 and the ventilation valve 30, the pipe part 52 connected to the washer part 51 and a hot water hose through which cooling water passes, and the washer part. 51 is formed so as to include a flexible bracket portion 53 that can flexibly determine the position of the oil separator 51 relative to the oil separator 20. Specifically, the flexible bracket portion 53 was formed so as to be bent at two locations between a portion connected to the washer portion 51 and a portion in contact with the support attachment portion 21 of the oil separator 20. That is, the flexible bracket portion 53 is bent so that the washer portion mounting surface 22 of the oil separator 20 can be expanded and contracted in two directions, a direction orthogonal to the washer portion and a parallel direction. Thereby, since the heat of the cooling water is transmitted to the ventilation valve 30 via the support body 50, the ventilation valve 30 can be prevented from being frozen by moisture contained in the blow-by gas. In addition, since the flexible bracket portion 53 is formed to be movable in two directions, even if the support 50 and the oil separator 20 have variations due to manufacturing tolerances or the like, the variations of the flexible bracket portion 53 are reduced. The support 50, the oil separator 20 and the ventilation valve 30 can be easily assembled by absorbing by expansion and contraction. That is, the oil separator 20 and the ventilation valve 30 can be easily assembled with a higher degree of freedom in positioning and the like while ensuring heat transfer to the ventilation valve 30 without changing the specification of the ventilation valve 30. It becomes like this. In addition, since the load of the oil separator 20 and the ventilation valve 30 is supported by the flexible bracket portion 53, reliability in fixing the ventilation valve 30 to the oil separator 20 is improved.

  (2) About the flexible bracket part 53 of the support body 50, the plate | board thickness was formed thinner than the plate | board thickness of the washer part 51. FIG. Thereby, it is suppressed that the heat from a cooling water is transmitted to the flexible bracket part 53 side, and the efficient heat transfer to the ventilation valve 30 is attained.

  (3) A protrusion 22a is formed at the lower part of the washer part mounting surface 22 of the oil separator 20, and a claw part 51b to be engaged with the protrusion 22a is formed at the lower part of the part of the washer part 51 that contacts the oil separator 20. did. As a result, the support 50 is properly positioned with respect to the oil separator 20 and can be assembled more easily. In particular, since the claw portion 51b is formed obliquely with respect to the extending / contracting direction of the flexible bracket portion 53, the positioning can be performed accurately while absorbing the displacement by the expansion / contraction.

  (4) The support guide mounting portion 21 of the oil separator 20 is provided with a tip guide portion 21 a that comes into contact with the tip of the mounting portion 53 b of the flexible bracket portion 53. Thereby, when installing the flexible bracket part 53 of the support body 50 in the support body attaching part 21 of the oil separator 20, a moderation feeling (click feeling) is produced and the attachment can be performed easily.

  (5) A side guide portion 21 b that is in contact with a side portion of the attachment portion 53 b of the flexible bracket portion 53 is provided on the support attachment portion 21 of the oil separator 20. Thereby, the flexible bracket part 53 of the support body 50 is guided including its side part, and the flexible bracket part 53 can be attached more easily.

  (6) The oil separator 20 and the ventilation valve 30 were formed from a resin material. Therefore, the oil separator 20 and the ventilation valve 30 can be easily manufactured. In addition, even when the oil separator 20 and the ventilation valve 30 are made of a resin material as described above, the heat transfer to the ventilation valve 30 can be appropriately performed due to the presence of the metal support 50.

  (7) About the washer part 51 of the support body 50 formed by the punching process by the press machine, the punching direction is set to be the same direction as the insertion direction of the ventilation valve 30. Thereby, since no burr is formed on the side of the ventilation valve 30 of the washer portion 51, the ventilation valve 30 can be assembled to the oil separator 20 without damaging the O-ring 31 during insertion.

In addition, the said embodiment can also be implemented with the following forms.
In the above embodiment, the flexible bracket portion 53 is bent at two locations, but may be bent at three or more locations.

  In the above embodiment, the washer portion 51, the pipe portion 52, and the flexible bracket portion 53 are integrally formed to constitute the support body 50. However, the washer portion 51, the pipe portion 52, and the flexible bracket portion 53 are formed separately and connected separately by bolts or the like. Also good.

  -The claw part 51b of the washer part 51, the front-end | tip guide part 21a of the oil separator 20, and the side part guide part 21b in the said embodiment are not essential structures. That is, even without these configurations, if there is a flexible bracket portion 53 that can flexibly determine the position of the washer portion 51 with respect to the oil separator 20, it is possible to improve the degree of freedom of assembly, particularly positioning.

  In the above embodiment, the flexible bracket portion 53 of the support 50 is attached to the support attachment portion 21 of the oil separator 20, but may be attached directly to the cylinder head cover, for example. That is, if the position of the washer portion 51 relative to the oil separator 20 can be determined flexibly between the washer portion attachment surface 22 of the oil separator 20 and the attachment surface of the oil separator 20 body to the cylinder head cover, the flexible bracket portion 53 Is not necessarily attached to the oil separator 20.

  In the above embodiment, the oil separator 20 and the ventilation valve 30 are formed of a resin material. However, even when the oil separator 20 and the ventilation valve 30 are made of a material other than the resin material, the assembly can be similarly facilitated.

DESCRIPTION OF SYMBOLS 10 ... Cylinder head cover, 20 ... Oil separator, 21 ... Support body attaching part, 21a ... Tip guide part, 21b ... Side part guide part, 22 ... Washer part attaching surface, 22a ... Projection piece, 30 ... Ventilation valve, 40 ... Intake System hose, 50 ... support, 51 ... washer part, 51a ... circular part, 51b ... claw part, 52 ... pipe part, 53 ... flexible bracket part, 53b ... attachment part, 60 ... hot water hose.

Claims (6)

A blow-by gas processing apparatus for performing a process of recirculating blow-by gas generated inside an internal combustion engine to an intake system of the engine via an oil separator and a ventilation valve, and supporting the ventilation valve on the oil separator Ventilation valve support structure of
A metal washer portion sandwiched between the oil separator and the ventilation valve; a metal pipe portion connected to the washer portion and connected to a hot water hose through which cooling water circulated in the internal combustion engine passes; The washer part mounting surface of the oil separator is bent at least at two locations so as to be movable in a direction perpendicular to and parallel to the oil separator body, and one is connected to the washer part and the other is attached to the oil separator body. A ventilation valve support structure for a blow-by gas processing apparatus, wherein the oil separator is supported by a support body including a metal flexible bracket portion attached to a surface . The ventilation valve support structure of the blow-by gas processing apparatus according to claim 1, wherein the flexible bracket portion is formed with a plate thickness thinner than a plate thickness of the washer portion. A protruding piece is formed at the lower part of the washer part mounting surface of the oil separator, and a claw part that is engaged with the protruding piece is formed at the lower part of the part of the washer part that contacts the oil separator. The ventilation valve support structure of the blow-by gas processing apparatus according to claim 1 or 2 . In the oil separator, a support attachment portion for attaching the flexible bracket portion from the attachment surface of the main body is extended in a tongue-like shape, and the attachment portion of the flexible bracket portion is provided in the support attachment portion. The ventilation valve support structure of the blow-by gas processing device according to any one of claims 1 to 4 , wherein a tip guide portion that is in contact with the tip is provided. The ventilation valve support structure for a blow-by gas processing apparatus according to claim 4 , wherein the support attachment part is further provided with a side guide part that comes into contact with the attachment part side part of the flexible bracket part. The ventilation valve support structure of the blow-by gas processing apparatus according to any one of claims 1 to 5 , wherein the oil separator and the ventilation valve are made of a resin material.

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