JP2006241999A - Cylinder head cover for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain highly accurate positions of oil passage ends on the cylinder head cover side with a built-in oil control valve for supplying and discharging an operating fluid to and from a variable valve system of an internal combustion engine. <P>SOLUTION: Connecting oil passage parts 18, 20, 22 on the cylinder head cover 2 side are held being integrated with a cylinder head cover body 4 made of resin, on the base part side, and held to a metallic baffle plate 40 on the tip side. The rigidity of the whole cylinder head cover 2 is thereby improved to hardly cause deformation. Even if the cylinder head cover body 4 itself is slightly deformed, influence on the position accuracy of the oil passage ends 18a, 20a, 22a existing on the tip side of the connecting oil passage parts 18, 20, 22 is reduced to maintain high position accuracy. As a result of thus solving the problem, smooth supply and discharge of the operating fluid can be performed to and from the variable valve mechanism, and a leakage of the operating fluid from an abutting surface can be prevented to maintain smooth driving of the variable valve mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention has a mounting portion for mounting an oil control valve for controlling supply and discharge of hydraulic oil to and from a variable valve mechanism, and a connection oil passage portion for connecting a cylinder head side oil passage to the oil control valve. The present invention relates to a cylinder head cover of an internal combustion engine.

  When installing an oil control valve that controls the supply and discharge of hydraulic oil to the variable valve mechanism of an internal combustion engine, attach the oil control valve to the cylinder head cover from the viewpoint of attaching / detaching the oil control valve and facilitating the supply of hydraulic oil. (See, for example, Patent Document 1).

In such a technique of Patent Document 1, a configuration in which an oil control valve is mounted in a valve case attached to a cylinder head cover is employed. In order to connect the oil control valve in the valve case and the oil passage on the cylinder head side, the intermediate member protrudes into the internal space of the cylinder head cover, and the oil passage end of the oil passage formed in the intermediate member is It is in contact with the oil passage end of the oil passage formed in the cam cap. As a result, the supply and discharge of the hydraulic oil to and from the valve timing adjustment mechanism, which is one type of variable valve mechanism provided at the tip of the camshaft, is controlled by the oil control valve so that the desired valve timing is obtained. The variable valve mechanism is driven.
Japanese Patent No. 3525709 (page 4-6, FIGS. 1 and 3)

  However, from the viewpoint of weight reduction and noise reduction, it is conceivable that the cylinder head cover is made of resin or the wall thickness of the cylinder head cover is made thinner than the configuration of Patent Document 1. However, if this is done, the rigidity of the cylinder head cover is reduced, and therefore the cylinder head cover is likely to be deformed due to a change in temperature or a change in internal pressure. Further, when the cylinder head cover is attached to the cylinder head side, the cylinder head cover is easily deformed due to distortion.

  When such deformation occurs in the cylinder head cover, the oil passage end protruding from the cylinder head cover side is displaced with respect to the oil passage end formed on the cam cap or the like, and the oil passage ends are sufficiently connected to each other. The hydraulic oil may not flow smoothly, or the hydraulic oil may leak from the contact surface of the oil passage end. Therefore, there is a possibility that it is difficult to supply and discharge hydraulic oil to the variable valve mechanism, which may hinder smooth drive of the variable valve mechanism.

  An object of the present invention is to realize a cylinder head cover that can maintain the position accuracy of the oil passage end on the cylinder head cover side with high accuracy.

In the following, means for achieving the above object and its effects are described.
The cylinder head cover of the internal combustion engine according to claim 1 is provided with a mounting portion for mounting an oil control valve for controlling supply and discharge of hydraulic oil to and from the variable valve mechanism, and a state protruding from the inner surface of the cylinder head cover main body into the internal space. A cylinder head cover for an internal combustion engine having a connecting oil passage portion for contacting the oil passage end of the cylinder head side oil passage with the end of the oil passage on the cylinder head side of the internal combustion engine and connecting the cylinder head side oil passage to the oil control valve. And a holding member attached to the inner surface of the cylinder head cover body in a state where a part thereof is hung in the internal space of the cylinder head cover main body, the holding member being hung in the internal space The portion holds a part of the connection oil passage portion protruding into the internal space.

  The connecting oil passage portion protrudes into the internal space from the inner surface of the cylinder head cover main body, but the holding member holds a part of the connecting oil passage portion by the portion spanned in the internal space. Yes.

  The connecting oil passage portion is fixed to the cylinder head cover main body on the base side, but is held by the holding member in the inner space from the base side to the tip side. Thus, the structure in which the connecting oil passage is held at at least two points improves the rigidity of the entire cylinder head cover and makes it difficult to deform.

Furthermore, since the connecting oil passage portion is held by the holding member on the tip side of the base portion, the oil passage end existing on the tip side is more firmly positioned in the cylinder head cover.
Therefore, the cylinder head cover is not easily deformed by a change in temperature, a change in internal pressure, a distortion at the time of mounting, and the like, and the position accuracy of the oil passage end existing on the distal end side of the connecting oil passage portion is maintained at high accuracy. Further, even if the cylinder head cover main body is slightly deformed, the holding member is held on the distal end side of the connecting oil passage portion, so that the influence on the position accuracy of the oil passage end is reduced and high accuracy can be maintained.

  A cylinder head cover for an internal combustion engine according to claim 2, wherein the cylinder head cover main body is made of resin, and the holding member is made of a material having higher rigidity than the cylinder head cover main body. It is characterized by.

  When the cylinder head cover body is made of resin in this way, the holding member is formed of a material having higher rigidity than the cylinder head cover body, so that the deformation of the cylinder head cover is effectively prevented and the positioning of the oil path end is performed. Will be more robust. Therefore, the position accuracy of the oil passage end existing on the front end side of the connecting oil passage portion can be maintained with higher accuracy.

A cylinder head cover for an internal combustion engine according to a third aspect is characterized in that, in the second aspect, the holding member is a metal plate.
Thus, by using a metal plate as a holding member for the cylinder head cover body made of resin, the position accuracy of the oil passage end existing on the distal end side of the connecting oil passage portion can be maintained with sufficiently high accuracy.

A cylinder head cover for an internal combustion engine according to a fourth aspect of the present invention is the cylinder head cover according to the third aspect, wherein the holding member also serves as a baffle plate for blow-by gas ventilation.
As described above, the metal plate holding member may not be provided exclusively, but may also serve as a blow-by gas ventilation baffle plate. By using it in this way, the entire configuration of the cylinder head cover can be simplified.

  The cylinder head cover for an internal combustion engine according to claim 5, wherein the holding member has a fitting hole formed in a portion spanned in the internal space, and the fitting hole. It is characterized in that it is held by fitting a part of the connecting oil passage portion protruding into the internal space.

  Thus, by forming a fitting hole with respect to the holding member of the metal plate and fitting a part of the connection oil passage part into this fitting hole, the oil passage existing on the tip side of the connection oil passage part End position accuracy can be maintained with higher accuracy.

  The cylinder head cover for an internal combustion engine according to claim 6, wherein the oil passage in the connection oil passage portion is an oil passage through which hydraulic oil is supplied to and discharged from the variable valve mechanism. It is characterized in that it is abutted and connected to the oil passage end formed on the cam cap on the cylinder head side.

  In the case where the oil passage in the connecting oil passage portion is in contact with and connected to the oil passage end of the oil passage that is provided on the cam cap and supplies and discharges hydraulic oil to and from the variable valve mechanism. Therefore, smooth hydraulic oil supply / discharge control for the variable valve mechanism is possible, and the variable valve mechanism can be driven smoothly.

  The cylinder head cover of the internal combustion engine according to claim 7, wherein the oil passage in the connection oil passage portion is an oil passage of a hydraulic oil supply oil passage that supplies the hydraulic oil from the cylinder head side. It is characterized by being abutted and connected to an end of an oil passage formed on the cylinder head.

  When the oil passage in the connecting oil passage portion is in contact with the oil passage end of the hydraulic oil supply oil passage formed on the cylinder head in this way, the hydraulic oil leaks at the contact surface. The hydraulic pressure can be maintained. For this reason, the variable valve mechanism can be driven smoothly.

[Embodiment 1]
FIG. 1 is a bottom view of a cylinder head cover 2 of an internal combustion engine to which the above-described invention is applied, and FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 shows a cross-sectional view of a cylinder head H portion of the internal combustion engine in which the cylinder head cover 2 is incorporated.

  The cylinder head cover body 4 occupying the main structure of the cylinder head cover 2 is integrally formed of resin. In the cylinder head cover body 4, mounting structures 10 and 12 for mounting oil control valves (hereinafter referred to as “OCV”) 6 and 8 are integrated into the resin of the cylinder head cover body 4 by insert molding.

  The mounting structures 10 and 12 are cylindrical mounting portions 14 and 16 in which mounting holes 14a and 16a for mounting the OCVs 6 and 8 are formed, and a connecting oil passage that hangs down from substantially the center of the mounting portions 14 and 16. Parts 18 and 20. The mounting structures 10 and 12 are integrally formed of a metal material, here, an aluminum alloy.

  Of these mounting structures 10 and 12, one mounting structure 10 is for the intake camshaft, and the mounting hole 14a of the mounting portion 14 is mounted with an OCV 6 for adjusting the valve timing of the intake valve. . The other mounting structure 12 is for the exhaust camshaft, and the mounting hole 16a of the mounting portion 16 is mounted with an OCV 8 for adjusting the valve timing of the exhaust valve.

  The mounting portions 14 and 16 are respectively formed with five oil passages 14b to 14f and 16b to 16f each having one end opened in the mounting holes 14a and 16a so as to be adapted to the five ports of the OCVs 6 and 8. Among these, the supply oil passages 14 c and 16 c are connected to a connection oil passage portion 22 on the hydraulic oil supply side formed in the cylinder head cover body 4. The connecting oil passage portion 22 is opened downward at an oil passage end 22 a that protrudes downward in the internal space of the cylinder head cover body 4. When the cylinder head cover 2 is attached to the cylinder head H side, the oil path end 22a abuts on the oil path end 24a of the hydraulic oil supply oil path 24 on the cylinder head H side. The supply oil passage 24 and the connection oil passage portion 22 on the cylinder head cover main body 4 side are connected. As a result, the hydraulic oil flows as shown by the arrows in FIG. 1, and the hydraulic oil can be supplied to the OCVs 6 and 8 mounted in the mounting holes 14 a and 16 a through the supply oil passages 14 c and 16 c of the mounting portions 14 and 16. .

  The advance oil passages 14e and 16e and the retard oil passages 14f and 16f pass through the connection oil passage portions 18 and 20, and are opened downward at the lower oil passage ends 18a and 20a. The oil passage ends 18a and 20a are brought into contact with the upper surfaces of the cam caps 26 and 28 when the cylinder head cover 2 is attached to the cylinder head H side. As a result, they are connected to the advance oil passages 26a, 28a and the retard oil passages 26b, 28b formed in the cam caps 26, 28 and opening upward, respectively.

  Here, the advance oil passage 26a and the retard oil passage 26b of the intake camshaft cam cap 26 are the advance oil passage 30a and the retard oil passage 30b formed in the intake camshaft 30 in the axial direction. It is connected to the. As a result, the advance oil passage 26a and the retard oil passage 26b are connected to the advance hydraulic chamber and the retard hydraulic chamber of the variable valve mechanism for intake valve timing provided at the tip of the intake camshaft 30, respectively. Has been. The advance oil passage 28a and the retard oil passage 28b of the cam cap 28 for the exhaust camshaft are connected to the advance oil passage 32a and the retard oil passage 32b formed in the axial direction in the exhaust camshaft 32. Has been. As a result, the advance oil passage 28a and the retard oil passage 28b are connected to the advance hydraulic chamber and the retard hydraulic chamber of the exhaust valve timing variable valve mechanism provided at the tip of the exhaust camshaft 32, respectively. Has been.

  In this way, the OCVs 6 and 8 are controlled by an electronic control unit (hereinafter referred to as “ECU”) 34, whereby the hydraulic oil supply to the advance hydraulic chamber and the retard hydraulic chamber of each variable valve mechanism can be controlled. As a result, the rotational phase difference between the timing sprockets provided in the variable valve mechanisms and the camshafts 30 and 32 can be changed. As a result, the rotational phase difference between the camshafts 30 and 32 and the crankshaft in which the timing sprocket is linked via the timing chain can be changed. Thus, the ECU 34 can individually adjust the intake valve timing and the exhaust valve timing.

  As shown in the figure, a baffle plate 40 made of a metal plate, here an iron alloy plate material, is arranged in the internal space of the cylinder head cover body 4. This iron alloy baffle plate 40 is a blow-by for preventing oil mist generated on the cylinder head H side from directly blowing into the breather chamber 4a disposed above the baffle plate 40 in the cylinder head cover body 4. It is a baffle plate for gas ventilation. As a result, blow-by gas in a state where large particles of oil are separated is guided from the opening 40a to the breather chamber 4a.

  For this purpose, the baffle plate 40 is arranged so that the peripheral part is fixed to the cylinder head cover body 4 and a part, here, the central part is spanned over the internal space of the cylinder head cover body 4.

  4 shows the baffle plate 40, and FIG. 5 shows the cylinder head cover body 4 before the baffle plate 40 is attached. A plurality of through holes 40 b are formed in the peripheral portion of the baffle plate 40. The baffle plate 40 is fixed to the cylinder head cover body 4 by inserting the tips of the fixing ribs 4b on the cylinder head cover main body 4 side into the through holes 40b and melting the tips of the fixing ribs 4b with ultrasonic waves, laser light, or the like. .

  A plurality of openings such as an opening 40c for arranging the plug tube gasket are formed in the central portion of the baffle plate 40. Among these, on the front side of the cylinder head cover body 4, fitting holes 40 d, 40 e, 40 f of the oil passage ends 18 a, 20 a, 22 a of the mounting portions 14, 16 and the connection oil passage portion 22 are provided.

  As shown in FIGS. 2 and 3, hanging edges 41 d, 41 e, 41 f are formed at the edges of the fitting holes 40 d, 40 e, 40 f. When the baffle plate 40 is attached to the cylinder head cover body 4, the oil passage ends 18a, 20a, 22a are fitted into the fitting holes 40d, 40e, 40f. As a result, the oil passage ends 18 a, 20 a, and 22 a are held by the baffle plate 40 that spans the internal space of the cylinder head cover body 4.

  FIG. 6 shows a state in which the cylinder head cover 2 configured as described above is arranged on the cylinder head H and fastened with bolts or the like. In this state, the baffle plate 40 holds the oil passage ends 18a and 20a of the connection oil passage portions 18 and 20 and the oil passage end 22a of the connection oil passage portion 22. Therefore, even if the cylinder head cover body 4 is made of resin, the cylinder The entire head cover 2 is highly rigid. Furthermore, even if the cylinder head cover body 4 itself is slightly deformed, these oil passage ends 18a, 20a, 22a are held with high precision and firmness at specified positions.

  Therefore, the oil passage end 22a of the connection oil passage portion 22 can be brought into contact with the oil passage end 24a of the hydraulic oil supply oil passage 24 formed on the cylinder head H with high positional accuracy. At the same time, the oil passage ends 18a of the connecting oil passage portions 18, 20 are respectively connected to the oil passage ends of the oil passages 26a, 26b, 28a, 28b formed in the cam caps 26, 28 disposed on the cylinder head H. 20a can be contacted with high positional accuracy.

  In the configuration described above, the relationship with the claims is that the oil passages 26a, 26b, 28a, 28b formed in the hydraulic oil supply oil passage 24 and the cam caps 26, 28 correspond to the cylinder head side oil passage. The hydraulic oil supply oil passage end 24a and the oil passages 26a, 26b, 28a, 28b in these oil passages correspond to cylinder head side oil passage ends. The baffle plate 40 corresponds to a holding member.

According to the first embodiment described above, the following effects can be obtained.
(I). The connecting oil passage portions 18, 20, and 22 hang down from the inner surface of the resin cylinder head cover body 4 into the internal space and project. Then, the baffle plate 40 spanned in the internal space is connected by being fitted to a part of the connection oil passage portions 18, 20, 22 in this case, the front end portions thereof by the fitting holes 40d, 40e, 40f. The oil passage portions 18, 20, and 22 are held.

  As described above, the connecting oil passage portions 18, 20, and 22 are held by being integrated with the resin cylinder head cover body 4 on the base side, and held by the baffle plate 40 on the tip side. Thus, the structure in which the connecting oil passage portions 18, 20, and 22 are held at at least two points improves the rigidity of the cylinder head cover 2 as a whole and makes it difficult to deform.

  Furthermore, since the connecting oil passage portions 18, 20, and 22 are separately held by the baffle plate 40 on the tip side from the base portion, the oil passage ends 18a, 20a, and 22a existing on the tip side are more in the cylinder head cover 2. Positioned firmly. For this reason, even if the cylinder head cover body 4 itself made of resin is slightly deformed due to a change in temperature, a change in internal pressure, or a distortion at the time of mounting, the oil passage that exists on the tip side of the connecting oil passage portions 18, 20, and 22 The influence on the position accuracy of the ends 18a, 20a, 22a is reduced, and high position accuracy is maintained.

  In particular, the baffle plate 40 is formed of an iron alloy plate material having higher rigidity than the resin forming the cylinder head cover body 4. Moreover, the baffle plate 40 is fixed to the cylinder head cover body 4 at the peripheral portion thereof. Therefore, deformation of the cylinder head cover body 4 is effectively prevented, and the positioning of the oil passage ends 18a, 20a, and 22a is further strengthened. Therefore, the positional accuracy of the oil passage ends 18a, 20a, 22a existing on the front end side of the connecting oil passage portions 18, 20, 22 can be maintained with higher accuracy.

As a result, it is possible to smoothly supply and discharge the hydraulic oil to and from the variable valve mechanism, and it is possible to prevent hydraulic oil from leaking from the contact surface, so that smooth driving of the variable valve mechanism can be maintained.
(B). The baffle plate 40 serves as a holding member for the connection oil passage portions 18, 20 and 22 while having a function for ventilation of the original blow-by gas. Thus, since it is not necessary to provide a holding member exclusively, the structure of the whole cylinder head cover 2 can be simplified.

[Other embodiments]
(A). Unlike the above embodiment, the cylinder head cover 102 of FIG. 7 is made of metal to hold the oil passage end 118a, 120a, 122a side of each connecting oil passage portion on the cylinder head cover main body 104 separately from the baffle plate 140. A dedicated holding member 141 made of a plate is used.

  Also in this configuration, each oil passage end 118a, 120a, 122a is held by the holding member 141 whose peripheral portion is fixed to the cylinder head cover main body 104 by the fixing rib 104b. Produces an effect.

  (B). In the above-described embodiment, the axial direction of the mounting hole in the mounting portion is orthogonal to the axial direction of the camshaft, but in addition to this, the axial direction of the mounting holes 214a and 216a as shown in the cylinder head cover 202 in FIG. Thus, the mounting portions 214 and 216 may be disposed on the cylinder head cover main body 204. That is, the axial direction of the mounting holes 214 a and 216 a in the mounting portions 214 and 216 may be the axial direction of the cam shafts 230 and 232. In this case, the tips of the mounting portions 214 and 216 are slightly directed downward, but they may be arranged completely parallel to the axial direction of the camshafts 230 and 232.

  Also in this configuration, the oil passage ends 218a, 220a, and 222a are held by the baffle plate 240 whose peripheral portion is fixed to the cylinder head cover main body 204 by the fixing rib 204b, so that the effect of the first embodiment is produced.

In the first embodiment as well, the axial direction of the mounting hole may be arranged parallel to the camshaft arrangement surface without lowering the tip of the mounting portion.
(C). In each of the embodiments described above, the oil passage end of the connection oil passage portion in the mounting portion and the oil passage end of the connection oil passage portion to which hydraulic oil is supplied from the cylinder head H are both held by the holding member. When there is no oil passage to which hydraulic oil is supplied from the cylinder head H or when hydraulic oil is supplied from another route, only the oil passage end of the connection oil passage portion in the mounting portion is held by the holding member. Anyway. Even in this case, the effects described in the first embodiment can be produced.

(D). The holding member including the baffle plate is fixed by melting the tip of the fixing rib, but may be fixed by other mechanical joining or adhesive.
(E). Although the holding member including the baffle plate is formed of a metal material, it may be higher in rigidity than the resin forming the cylinder head cover body, and for example, a reinforced resin or the like that is limited to the metal material can be used.

  (F). An example in which the axial direction of the OCV mounted on the mounting portion is the longitudinal direction of the cylinder head cover (axial direction of the camshaft) (FIG. 8) and an example in the short direction (axial direction perpendicular to the camshaft) (FIGS. 1 to 7) However, it may be in the middle direction, and the effects of the respective embodiments can be produced.

  (G). In each of the above-described embodiments, the example of the internal combustion engine in which the variable valve mechanism is provided for both the intake valve and the exhaust valve has been described, but in addition to this, the variable valve mechanism for the intake valve or the exhaust valve The present invention can also be applied to an internal combustion engine having only one of the variable valve mechanisms for use. That is, even in an internal combustion engine provided with one OCV for one variable valve mechanism, the position accuracy of the oil passage end can be maintained with high accuracy by holding the oil passage end with the holding member as described above.

  (H). In each of the above embodiments, the cylinder head cover body is made of resin, but the cylinder head cover body may be made of metal. In this case, even if the wall thickness is reduced for weight reduction and the cylinder head cover main body itself is easily deformed, the oil path end is held by holding the oil path end with the holding member as described above. The position accuracy can be maintained with high accuracy.

  (I). In each of the above embodiments, the mounting structure is made of a metal material, and is integrated by insert molding in the cylinder head cover body. As a resin, it may be integrally molded with the cylinder head cover main body. Therefore, the oil passage end of the connection oil passage portion that comes into contact with the cam cap is made of resin, and the resin connection oil passage portion is held in position by the baffle plate.

FIG. 3 is a bottom view of the cylinder head cover according to the first embodiment. AA sectional drawing in FIG. 1 is a longitudinal sectional view of an internal combustion engine to which a cylinder head cover according to Embodiment 1 is attached. The bottom view of a baffle plate similarly. The bottom view of a cylinder head cover main body similarly. Similarly, the longitudinal cross-sectional view which shows the state which attached the cylinder head cover to the cylinder head. The bottom view of the cylinder head cover of another example. The longitudinal cross-sectional view which shows the state which attached the cylinder head cover of the other example to the cylinder head.

Explanation of symbols

  2 ... Cylinder head cover, 4 ... Cylinder head cover body, 4a ... Breaser chamber, 4b ... Fixing rib, 6,8 ... OCV, 10,12 ... Mounting structure, 14,16 ... Mounting portion, 14b-14f, 16b-16f ... Oil passage, 18, 20, 22 ... connection oil passage, 18a, 20a, 22a ... oil passage end, 24 ... hydraulic oil supply oil passage, 24a ... hydraulic oil supply oil passage end, 26, 28 ... cam cap, 26a, 26b, 28a, 28b ... oil passage, 30, 32 ... camshaft, 30a ... advance oil passage, 30b ... retard oil passage, 32a ... advance oil passage, 32b ... retard oil passage, 34 ... ECU, 40 ... baffle plate, 40a ... opening, 40b ... through hole, 40c ... opening, 40d, 40e, 40f ... fitting hole, 41d, 41e, 41f ... edge, 102 ... cylinder head cover, 104 ... cylinder head Bar body, 104b ... fixing rib, 118a, 120a, 122a ... oil passage end, 140 ... baffle plate, 141 ... holding member, 202 ... cylinder head cover, 204 ... cylinder head cover body, 204b ... fixing rib, 214,216 ... mounting part 214a, 216a ... mounting holes, 218a, 220a, 222a ... oil passage ends, 230, 232 ... camshafts, 240 ... baffle plates, H ... cylinder heads.

Claims (7)

Cylinder head side oil passage end of the internal combustion engine by forming a mounting part for mounting an oil control valve that controls the supply and discharge of hydraulic oil to and from the variable valve mechanism, and projecting from the inner surface of the cylinder head cover body into the internal space A cylinder head cover of an internal combustion engine having a connection oil passage portion for contacting a cylinder head side oil passage to the oil control valve by contacting an inner oil passage end to
A holding member attached to the inner surface of the cylinder head cover body in a state where a part of the holding member is suspended in the internal space of the cylinder head cover body, the holding member being A cylinder head cover for an internal combustion engine, wherein a part of the connecting oil passage portion protruding into the internal space is held. 2. The cylinder head cover for an internal combustion engine according to claim 1, wherein the cylinder head cover main body is made of resin, and the holding member is made of a material having higher rigidity than the cylinder head cover main body. 3. The cylinder head cover for an internal combustion engine according to claim 2, wherein the holding member is a metal plate. 4. The cylinder head cover for an internal combustion engine according to claim 3, wherein the holding member also serves as a baffle plate for blow-by gas ventilation. 5. The holding member according to claim 3, wherein the holding member has a fitting hole formed in a portion spanned in the inner space, and the connecting oil passage portion protruding into the inner space through the fitting hole. A cylinder head cover for an internal combustion engine, wherein a part of the cylinder head is held by fitting. 6. The cylinder head side cam cap according to claim 1, wherein the oil passage in the connection oil passage portion is an oil passage end of an oil passage that supplies and discharges hydraulic oil to and from the variable valve mechanism. A cylinder head cover for an internal combustion engine, wherein the cylinder head cover is abutted and connected to an end of an oil passage formed above. 6. The oil passage according to claim 1, wherein the oil passage in the connection oil passage portion is an oil passage end of a hydraulic oil supply oil passage that supplies hydraulic oil from a cylinder head side and is formed on the cylinder head. A cylinder head cover for an internal combustion engine, wherein the cylinder head cover is abutted and connected to an end.

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