JP2012002098A - Cylinder head cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder head cover that easily inserts a valve body of an OCV into a storage part of a valve case even if deformation by a resin pressure occurs in part of the valve case when a shell region of the cylinder head cover made of a synthetic resin.SOLUTION: An annular groove 13 is provided as a deformation absorption part in an end part in the valve case embedded in the shell part 2. An outer first annular protrusion of the annular groove 13 constitutes a deformable portion. Thus, even if the first annular protrusion is deformed, deformation of an inner second annular protrusion is prevented, which constantly enables the valve body of the OCV to be inserted into the valve case.

Description

  The present invention relates to a synthetic resin cylinder head cover mounted on an engine cylinder head, and more particularly to a cylinder head cover in which a valve case in which an oil control valve is mounted is embedded.

  In recent years, a cylinder head cover mounted on a cylinder head of an engine has been reduced in weight by being formed of a synthetic resin. A cylinder head cover in which a valve case for mounting an oil control valve (hereinafter referred to as “OCV”) is embedded and the valve case is integrated has been proposed.

  In the cylinder head cover of Patent Document 1, a metal valve case is integrated with an outer shell portion of a synthetic resin cylinder head cover. An OCV valve body is inserted and assembled into the valve case from an opening at one end of the valve case. The outer shell is provided with an annular protrusion that protrudes toward the end face of the opening of the valve case, and a seal ring is provided between the protrusion and the valve body. With such a structure, it is possible to prevent oil leakage from the boundary portion between the outer shell portion and the valve case to the outside.

JP 2009-22215 A

  As shown in FIG. 10, the conventional cylinder head cover has a structure in which a valve case 3 is embedded in an outer shell portion 2 that forms a part of the cylinder head cover 1 and an OCV 4 is attached to the valve case 3. . As shown in FIG. 11, the metal valve case 3 includes a cylindrical housing portion 6 having a circular hole 6 a into which the valve body 4 a of the OCV 4 is inserted, and an oil passage forming portion in which an oil passage 7 is formed. And 5. The valve case 3 is integrated with the outer shell portion 2 when the synthetic resin cylinder head cover 1 is molded. In this molding, the valve case 3 receives a high injection pressure or receives a resin shrinkage pressure during solidification. For this reason, the circular hole 6a is deformed even if it is slight.

  On the other hand, as shown in FIG. 12, a cylinder head cover having a structure in which the oil passage forming portion 5 is not formed of a metal material has been proposed for weight reduction. The outer shell portion 2 includes an oil passage forming portion 2 a having two oil passages 7. For this reason, in the molding die, the injection pressure of the resin flowing through the cavity for molding the oil passage forming portion 2 a is likely to act on the valve case 10. The inner surface 11 of the valve case 10 may be deformed so as to deviate from an allowable dimensional tolerance. Therefore, in such a case, it becomes difficult to insert the valve body 4a of the OCV 4 into the valve case 10.

  The present invention has been made paying attention to such a problem, and an object thereof is to provide a cylinder head cover in which an OCV valve body can be easily inserted into a valve case.

  In order to solve the above problem, the invention of the cylinder head cover according to claim 1 is directed to a cylinder head cover having a synthetic resin outer shell portion in which a valve case is embedded. A deformation allowing portion for allowing deformation by receiving the resin pressure, and a deformation absorbing portion for preventing the deformation from reaching the inner surface of the valve case. is there.

  According to the above configuration, the end portion of the bubble case is deformed in the deformation allowing portion, and the deformation is absorbed by the deformation absorbing portion so that the deformation is not transmitted to the inner surface of the valve case. For this reason, even if a high resin pressure acts on the valve case, it is possible to prevent deformation of the inner surface of the valve case so that it is not difficult to insert the OCV valve body into the valve case.

According to a second aspect of the present invention, in the cylinder head cover according to the first aspect, the deformation absorbing portion is a groove that opens to an end surface of the valve case.
According to a third aspect of the present invention, in the cylinder head cover according to the second aspect, the groove is annular.

According to a fourth aspect of the present invention, in the cylinder head cover according to the second aspect, the groove is located on the oil passage side and has a semicircular arc shape.
According to a fifth aspect of the present invention, in the cylinder head cover according to the second aspect, the end portion of the valve case is covered with the synthetic resin, and the synthetic resin does not enter the groove. The groove is filled with a thermosetting elastomer.

  According to the present invention, the end portion of the valve case is provided with the deformation allowing portion and the deformation absorbing portion. For this reason, when inserting a valve case and shape | molding a cylinder head cover, it can suppress that the deformation | transformation exceeding an allowable range arises in the inner surface of a valve case. Therefore, it is possible to provide a cylinder head cover that can easily insert the OCV into the valve case.

Sectional drawing which shows the state by which OCV was mounted | worn with the valve case of 1st Embodiment. Sectional drawing which shows the outer shell part with which the valve case was embed | buried. The A section enlarged view in FIG. The side view of the B arrow in FIG. CC sectional view taken on the line in FIG. Sectional drawing which shows the effect | action in 1st Embodiment. The side view of the partial cross section which shows the valve case of 2nd Embodiment. The side view which shows the edge part of the valve case of 3rd Embodiment. Sectional drawing which shows the valve case of 4th Embodiment. Sectional drawing which shows the outer shell part with which OCV in conventional technology was mounted | worn. Sectional drawing which shows the outer shell part in a prior art. Sectional drawing which shows the modification of the outer shell part in a prior art.

(First embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to FIGS. In addition, about the same structure as a prior art, the same code | symbol used in the description shall be used.

  As shown in FIG. 1, a metal valve case 10 is embedded in the outer shell 2 of the cylinder head cover 1 made of synthetic resin. An OCV 4 (oil control valve) is mounted in the valve case 10. The two annular oil grooves 4b in the valve body 4a of the OCV 4 and the two oil passages 7 in the oil passage forming portion 2a of the outer shell portion 2 communicate with each other through the oil holes 10b of the valve case 10. ing. Further, the oil is prevented from leaking out of the outer shell portion 2 by the O-ring 4c.

  As shown in FIG. 2, the entire valve case 10 is formed in a substantially cylindrical shape, but the left and right shapes thereof are different with respect to the boundary K. That is, the portion embedded in the oil passage forming portion 2a on the right side of the boundary K is an oil hole forming portion 10d (shown in FIG. 5) having an inverted U-shaped cross section with oil holes 10b formed in two places. Yes. Further, the portion on the left end 10 a side of the boundary K has a cylindrical shape and is embedded in the protruding portion 2 b of the outer shell portion 2. The valve case 10 is only exposed to the right end 10c in FIG. 2 inside the side shell 2d, and the other portions except the inner surface 11 are covered with the outer shell 2. An end portion 10a of the valve case 10 is covered with a covering portion 2c in the protruding portion 2b.

  As shown in FIG. 5, since the oil hole forming portion 10d is formed in an inverted U-shaped cross section, it is easy to confirm the posture of the valve case 10 unlike the case of a circular cross section. For this reason, when the valve case 10 is inserted into a mold (not shown), it can be set so that the axial direction of the oil hole 10b does not shift. Further, the valve case 10 can be held in a predetermined posture by applying a set pin (not shown) to the inverted U-shaped bottom portion.

  As shown in FIGS. 3 and 4, an annular groove 13 as a deformation absorbing portion is formed in the end portion 10 a of the valve case 10. The first annular protrusion 12a outside the annular groove 13 is deformed by receiving resin pressure, and constitutes a deformation allowing portion that relieves stress by the deformation. And the annular groove 13 of this embodiment is filled with the annular filler 14 made from urethane resin which is a thermosetting elastomer. The annular filler 14 is not melted by the heat of the synthetic resin forming the outer shell 2. For this reason, the annular filler 14 can prevent the synthetic resin from entering the annular groove 13.

In the present embodiment, liquid urethane resin is injected into the annular groove 13 and cured, but a previously formed annular shape may be inserted into the annular groove 13.
The valve case 10 having such a configuration is supported by a support pin on the inner surface 11 when inserted into a molding die (not shown) for molding the cylinder head cover 1. The fit between the support pin and the inner surface 11 is loose for ease of insertion. Therefore, the valve case 10 subjected to the resin pressure has room for shrinkage of the fitting tolerance, for example, an inner diameter of about 100 to 40 μm.

  Further, since the oil passage forming portion 2a is thicker than the other portions, the synthetic resin at the time of molding in the oil passage forming portion 2a does not reduce the flow velocity and the resin pressure, and therefore flows almost without resistance. can do. For this reason, a high resin pressure acts on the oil passage forming portion 2 a side of the valve case 10. Accordingly, in the oil hole forming portion 10d having an inverted U-shaped cross section, although not easily affected by the resin pressure, the vicinity of the end portion 10a of the cylindrical valve case 10 is formed on the inner surface 11 by the resin pressure of the oil passage forming portion 2a. Deformation is likely to occur.

  However, as shown in FIG. 6, in the valve case 10 of the present embodiment, only the first annular protrusion 12 a that has received the resin pressure stops deforming inward while compressing the annular filler 14. That is, since the annular groove 13 is provided on the deformation side of the first annular protrusion 12a, the first annular protrusion 12a is easily deformed. Further, the stress is relieved by the deformation, and the transmission of the deformation is blocked by the annular groove 13. For this reason, the second annular protrusion 12b is not deformed.

  In this embodiment, the annular groove 14 is filled with the annular filler 14, but the annular filler 14 is easily deformed because the material is an elastomer, and the first annular protrusion 12a is deformed. There is no hindrance. In addition, since the annular filler 14 itself is easily deformed to disperse the stress, it is possible to prevent the deformation from being transmitted to the second annular protrusion 12b.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the annular groove 13 as the deformation absorbing portion is formed in the end portion 10a of the valve case 10, and the first annular protrusion 12a outside the annular groove 13 is used as the deformation allowing portion. For this reason, in the molding of the cylinder head cover 1 with the valve case 10 inserted, only the first annular protrusion 12a is deformed by receiving the resin pressure due to the presence of the annular groove 13. Further, the stress causing the deformation is blocked by the annular groove 13. For this reason, since the second annular protrusion 12b hardly deforms, the dimensional tolerance of the inner diameter of the inner surface 11 can be maintained. Therefore, the cylinder head cover 1 in which the valve body 4a of the OCV 4 can be easily inserted into the valve case 10 can be provided.

  (2) In the above embodiment, the annular groove 13 of the end portion 10a of the valve case 10 is filled with the annular filler 14 made of thermosetting elastomer. For this reason, it is possible to prevent the synthetic resin forming the cylinder head cover 1 from entering the annular groove 13. Further, stress can be dispersed by deformation of the annular filler 14 itself. Therefore, the function of the annular groove 13 as a deformation absorbing portion can be maintained.

(Second Embodiment)
Next, a second embodiment that embodies the present invention will be described with reference to FIG. 7 with a focus on differences from the first embodiment.

  In the valve case 10 of the present embodiment, an annular groove 16 as a semicircular arc-shaped deformation absorbing portion is formed at the end portion 10a. The outer side of the annular groove 16 is a first annular protrusion 12a as a deformation allowing portion. Further, the inner side of the annular groove 16 is a second annular protrusion 12b that is not deformed by the first annular protrusion 12a.

  A high resin pressure acts on the oil passage forming portion 2a side of the valve case 10 as in the other portions, but not only this resin pressure but also due to shrinkage during cooling of the thick oil passage forming portion 2a, A force in the direction of separating the resin from the surface of the valve case 10 may occur. That is, at the end portion 10a of the valve case 10, the portion on the oil passage forming portion 2a side is more easily deformed. However, since the annular groove 16 is provided on the oil passage forming portion 2a side of the valve case 10, even if a relatively high resin pressure acts or a force in the separation direction is generated, the second annular protrusion The deformation of 12b can be prevented. Further, unlike the case where the circular annular groove 13 is formed, the annular groove 16 has an arc shape, so that the processing time can be reduced and the amount of urethane resin filled in the annular groove 16 can be reduced.

And in this 2nd Embodiment, in addition to the effect in 1st Embodiment, the following effects can be acquired.
(3) In the above-described embodiment, the semicircular circular groove 16 is formed in the end portion 10a, and the outer side is the first annular protrusion 12a and the inner side is the second annular protrusion 12b. For this reason, it is possible to prevent the deformation of the second annular protrusion 12b on the side receiving the high resin pressure. Further, the processing time of the annular groove 16 can be reduced, and the amount of urethane resin filled in the annular groove 16 can be reduced.

(Third embodiment)
Next, a third embodiment embodying the present invention will be described with reference to FIG. 8 with a focus on differences from the first and second embodiments.

  In the present embodiment, the first annular protrusion 12a is covered with an annular body 20 made of urethane resin and having a substantially C-shaped cross section. A part of the annular body 20 is fitted in the annular groove 13. In the present embodiment, the tip of the annular body 20 does not reach the groove bottom 13a. Accordingly, since a space is formed in the groove bottom portion 13a of the annular groove 13, deformation of the annular body 20 is allowed. For this reason, even if it is such a form, the penetration | invasion in the annular groove 13 of a synthetic resin can be prevented. The entire annular groove 13 may be filled with the annular body 20.

  Further, the covering portion 2 c of the protruding portion 2 b covers the first annular protrusion 12 a via the annular body 20. Therefore, in order to prevent oil from leaking to the outside from between the end 10a of the valve case 10 and the covering portion 2c, the annular body 20 can function as a sealing material.

In the third embodiment, the following effects can be obtained in addition to the effects in the first and second embodiments.
(4) In the above embodiment, the first annular protrusion 12a is covered with the annular body 20 made of urethane resin and having a substantially C-shaped cross section. In this case, a part of the annular body 20 is fitted in the annular groove 13. Therefore, it is possible to prevent the synthetic resin from entering the annular groove 13 and to seal the annular body 20 between the end portion 10a of the valve case 10 and the covering portion 2c. Can function as.

(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIG. 9 with a focus on differences from the first to third embodiments.

  In the valve case 10 of the present embodiment, the end portion 10a on the side where the OCV 4 is inserted and the end portion 10c opposite to the end portion 10a are exposed without being covered with the synthetic resin. And the annular groove 13 is formed in each edge part 10a, 10c. These annular grooves 13 are not filled with a thermosetting elastomer. Therefore, even if the resin pressure acts on the vicinity of both end portions 10a and 10c, the second annular protrusion 12b does not deform. For this reason, even when the valve body 4a longer than the valve case 10 is inserted, the tip of the valve body 4a can smoothly pass through the inner surface 11 of the end portion 10c. Therefore, insertion can be performed easily.

And in this 4th Embodiment, it can replace with the effect in 1st-3rd embodiment, and can obtain the following effects.
(5) In the above embodiment, the both end portions 10a and 10c of the valve case 10 are exposed, and the annular groove 13 is formed in each of the both end portions 10a and 10c. For this reason, the deformation | transformation of the 2nd cyclic | annular protrusion 12b of both ends 10a and 10c can be prevented. Therefore, even when the valve body 4a longer than the valve case 10 is inserted, the valve body 4a can be easily inserted.

(Example of change)
In addition, the said embodiment can also be changed and actualized as follows.
The annular filler 14 or the annular body 20 is formed of urethane resin, but is formed of thermosetting elastomer such as silicone resin or fluororesin.
In the third embodiment, the annular body 20 has a substantially C-shaped cross section. However, the annular body 20 has a substantially L-shaped cross section or a substantially T-shaped cross section, and a part thereof is fitted into the annular groove 13.

Further, technical ideas that can be grasped from the above-described embodiment are described below together with their effects.
(A) The deformation absorbing portion is arranged at a position where the resin pressure acts at a higher pressure than the other portion at an end portion of the valve case. Cylinder head cover. When comprised in this way, the processing time for forming a deformation | transformation absorption part can be reduced.
(2) The cylinder head cover according to claim 3, wherein the annular groove is filled with a thermosetting elastomer that is injected and cured in a liquid state. When configured in this manner, the annular groove can be easily filled with the thermosetting elastomer.

    DESCRIPTION OF SYMBOLS 1 ... Cylinder head cover, 2 ... Outer shell part, 7 ... Oil path, 10 ... Valve case, 10a, 10c ... End part, 11 ... Inner surface.

Claims (5)

  In the cylinder head cover having an outer shell portion made of synthetic resin in which the valve case is embedded, the end portion of the valve case is provided with a deformation allowing portion that allows deformation by receiving resin pressure at the time of molding, A cylinder head cover comprising a deformation absorbing portion for preventing the deformation from reaching the inner surface of the valve case.   The cylinder head cover according to claim 1, wherein the deformation absorbing portion is a groove opened in an end surface of the valve case.   The cylinder head cover according to claim 2, wherein the groove is annular.   The cylinder head cover according to claim 2, wherein the groove is located on the oil passage side and has a semicircular arc shape.   An end portion of the valve case is covered with the synthetic resin, and the groove is filled with a thermosetting elastomer so that the synthetic resin does not enter the groove. The cylinder head cover according to claim 2.

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