JP2006233856A - Collar for reinforcement, cylinder head cover, and mounting structure of cylinder head cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction of positional precision of a functional device for an internal combustion engine for a cylinder head by preventing positional deviation of a cylinder head cover. <P>SOLUTION: This collar 24 is arranged in a condition in which it adheres closely to an inner peripheral face of a through hole in a plurality of bolt tightening parts 22 of a cylinder head cover main body 4. This collar 24 is constituted by molding a lower end face into a high friction form by a projecting part 24b. For this reason, the whole cylinder head cover 2 does not cause positional deviation on the cylinder head H easily. Since positional deviation of the cylinder head cover 2 does not occur easily even if the cylinder head cover 2 is deformed due to change of temperature and change of internal pressure, it is possible to prevent reduction of positional precision of an oil control valve arranged on the cylinder head cover 2 for the cylinder head H. For this reason, smooth supply and discharge of hydraulic fluid from the oil control valve to a movable valve gear can be maintained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reinforcing collar that reinforces a mounting member when bolts are tightened, a cylinder head cover that is bolted, and a cylinder head cover mounting structure that is bolted.

  In order to bolt various attachment members to the counterpart member, through holes for bolt fastening are provided in the attachment members. In such a mounting member, a collar may be disposed in the through hole in order to prevent the peripheral portion of the through hole from being deformed or damaged by bolt fastening (for example, see Patent Document 1).

The collar of Patent Document 1 is a bush collar, which sandwiches a rubber bush with a washer and fastens a bolt to a cross member of a vehicle body to elastically support a bracket. The bush collar is provided with a protrusion toward the center on the tip side so that the rubber bush does not come off before bolting during assembly and transport. The protrusion engages with an engaging portion provided on the inner peripheral side of the washer by rotating the washer holding the rubber bush. This prevents the rubber bush as the mounting member from falling off from the bush collar.
Japanese Patent Laying-Open No. 2003-104077 (page 2-3, FIG. 1)

  A function device for an internal combustion engine that functions by being connected to or opposed to an internal mechanism disposed on the cylinder head side of the internal combustion engine covered by the cylinder head cover may be disposed on the cylinder head cover. Examples of such a functional device for an internal combustion engine include an oil control valve (hereinafter referred to as “OCV”) for driving a variable valve mechanism and a cam angle sensor which is a rotation angle sensor for a camshaft.

  Such an OCV or cam angle sensor must be arranged with high accuracy with respect to an internal mechanism arranged on the cylinder head side. For example, if the position accuracy of the OCV is low, the position of the contact surface between the oil path on the OCV side and the oil path on the cylinder head side will be displaced, and the hydraulic oil cannot be supplied or discharged smoothly or the hydraulic oil will leak. Therefore, the control of the variable valve mechanism may be hindered. In the case of the cam angle sensor, there is a possibility that an error occurs in the position detection of the rotor attached to the camshaft belonging to the cylinder head side and the cam angle detection with high accuracy cannot be performed.

  Therefore, the cylinder head cover in which such a functional device for an internal combustion engine is arranged needs to have a high positional accuracy with respect to the cylinder head. For this reason, the bolt fastening in the peripheral part of the cylinder head cover and the like is strengthened.

  However, if the cylinder head cover is made resin or thinned to reduce the weight of the internal combustion engine, etc., tightening the bolts may cause deformation or damage to the bolt fastening part of the cylinder head cover or its surroundings. There is a tendency that power cannot be increased.

  Moreover, when the cylinder head cover is made of resin or thinned, the cylinder head cover is easily deformed due to a temperature change or an internal pressure change of the cylinder head cover. If such deformation occurs, the bolt fastening force cannot be increased, so that the positional relationship between the bolt and the bolt through hole is deviated from the initial state of fastening, and as a result, the entire cylinder head cover may be displaced from the specified position on the cylinder head. Occurs. Further, when the deformation repeatedly occurs, the positional deviation between the bolt and the bolt through hole gradually increases, and the entire cylinder head cover may be largely displaced from the specified position on the cylinder head.

  When such a displacement of the cylinder head cover occurs, the positional accuracy of the internal combustion engine functional device disposed on the cylinder head cover decreases. As a result, for example, as described above, in the case of OCV, the contact surface between the oil passages is displaced, which hinders control of the variable valve mechanism. In the case of a cam angle sensor, the cam angle detection accuracy is high. May decrease.

  An object of the present invention is to prevent a positional accuracy of an internal combustion engine functional device or the like from being lowered relative to a counterpart member by preventing a displacement of a mounting member such as a cylinder head cover on a counterpart member such as a cylinder head. Is.

In the following, means for achieving the above object and its effects are described.
The reinforcing collar according to claim 1 is disposed in a close contact state or a joined state on the inner peripheral surface of the through hole of the mounting member, and when the bolt is inserted into the through hole and the mounting member is bolted to the mating member. A reinforcing collar for reinforcing the mounting member is characterized in that an end surface that comes into contact with the mating member at the time of bolt fastening is in a high friction form.

  By arranging the reinforcing collar in a close contact state or a joined state on the inner peripheral surface of the through hole of the attachment member, it can be said that the reinforcement collar is integrated with the attachment member with respect to the arrangement on the counterpart member.

  Further, this reinforcing collar has a high frictional shape on the end surface that contacts the mating member. That is, when the bolt is fastened and comes into contact with the mating member, the reinforcing collar is unlikely to be displaced on the mating member. For this reason, the mounting member integrated with the reinforcing collar is reinforced by the reinforcing collar and is not easily deformed, and even if the deformation occurs due to a temperature change or an internal pressure change, Is less likely to be displaced from the state at the time of bolt fastening.

  By preventing the displacement of the mounting member in this way, the internal combustion engine function with respect to the counterpart member such as the cylinder head can be achieved even when the internal combustion engine functional device is disposed on the mounting member such as the cylinder head cover. It is possible to prevent the position accuracy of the apparatus and the like from being lowered.

  According to a second aspect of the present invention, the reinforcing collar according to the first aspect of the present invention is characterized in that a high friction form is realized by forming irregularities on the end face contacting the counterpart member.

  Thus, the high friction form of the reinforcing collar may be realized by forming irregularities. The convex part of the concaves and convexes bites into a mating member such as a cylinder head when the bolt is fastened, and causes a high friction state. As a result, even if the mounting member such as the cylinder head cover is deformed by a change in temperature or a change in internal pressure, or the deformation is repeated, the through hole portion of the mounting member fastened to the counterpart member is displaced. Since it does not occur, the entire mounting member is prevented from being displaced. Therefore, even when an internal combustion engine functional device or the like is disposed on an attachment member such as a cylinder head cover, it is possible to prevent a decrease in position accuracy of the internal combustion engine functional device or the like with respect to a counterpart member such as a cylinder head.

According to a third aspect of the present invention, the reinforcing collar according to the second aspect is characterized in that the convex portion of the end face is formed in a sharp shape.
By forming the convex portion in a sharp shape in this way, the tip of the convex portion can easily bite into the counterpart member, and a high friction state can be effectively generated.

  According to a fourth aspect of the present invention, in the reinforcing collar according to any one of the first to third aspects, in order to reinforce the mounting member in which the through hole forming portion is made of resin, the reinforcing collar is more than the resin in the through hole forming portion. It is formed of a highly rigid material.

  In this way, the mounting member is reinforced more effectively and is less likely to be deformed by being formed of a material that is more rigid than the resin of the through hole forming portion, and from the state at the time of bolt fastening. Misalignment is prevented more effectively. In this way, it is possible to effectively prevent a decrease in position accuracy of the internal combustion engine functional device with respect to the counterpart member such as the cylinder head.

According to a fifth aspect of the present invention, the reinforcing collar according to the fourth aspect is made of metal.
In this way, the reinforcing collar can be made of metal, and it is possible to effectively prevent a decrease in position accuracy of the internal combustion engine functional device or the like with respect to the counterpart member such as the cylinder head.

  The cylinder head cover according to claim 6 is a cylinder head cover in which a functional device for an internal combustion engine that functions to be connected to or opposed to an internal mechanism disposed on the cylinder head side of the internal combustion engine is disposed. Bolt fastening through holes are provided, and a high friction collar whose end face contacts the cylinder head in a high friction state is in close contact with or joined to an inner peripheral surface of at least two of the plurality of bolt fastening through holes. It is arranged in a state.

  In the cylinder head cover, the high friction collar is disposed in a close contact state or a joined state on the inner peripheral surface of at least two bolt fastening through holes. As a result, regarding the arrangement on the cylinder head, the cylinder head cover and the high friction collar are integrated, and if the position of the high friction collar on the cylinder head is determined, the position of the cylinder head cover is also determined.

  The high friction collar comes into contact with the cylinder head in a high friction state at the end face. As a result, when the cylinder head cover is bolted and the high friction collar comes into contact with the cylinder head, the high friction collar is unlikely to be displaced on the cylinder head. For this reason, even if the cylinder head cover integrated with the high-friction collar is deformed due to a temperature change, an internal pressure change, or the like, the arrangement on the cylinder head is not easily displaced from the state at the time of bolt fastening.

  By preventing the displacement of the cylinder head cover in this way, even when the internal combustion engine functional device is disposed on the cylinder head cover, it is possible to prevent a decrease in the positional accuracy of the internal combustion engine functional device with respect to the cylinder head. it can.

A cylinder head cover according to a seventh aspect is characterized in that, in the sixth aspect, the reinforcing collar according to any one of the first to fifth aspects is used as the high friction collar.
Thus, the reinforcing collar according to any one of claims 1 to 5 can be used as the high-friction collar, and the displacement of the cylinder head cover is more effectively prevented, and the internal combustion engine disposed on the cylinder head cover. It is possible to prevent the position accuracy of the engine functional device from being lowered.

  The cylinder head cover according to claim 8 is characterized in that, in claim 6 or 7, substantially the whole including a portion where the bolt fastening through hole is formed is made of resin, and the high friction collar is made of metal. To do.

  A metal high friction collar is applied to the cylinder head cover made of resin in such a configuration. As a result, the peripheral portion of the bolt fastening through-hole can be prevented from being deformed or damaged by bolt fastening, and the displacement of the cylinder head cover is prevented, so that the position of the functional device for the internal combustion engine disposed on the cylinder head cover is prevented. A reduction in accuracy can be prevented.

  The cylinder head cover mounting structure according to claim 9 is a cylinder head cover mounting structure in which a functional device for an internal combustion engine that functions as being connected to or opposed to an internal mechanism disposed on the cylinder head side of the internal combustion engine is disposed. The cylinder head cover has a plurality of bolt fastening through holes, the cylinder head has recesses on surfaces facing at least two of the bolt fastening through holes, and the cylinder head cover has the A positioning collar having an end portion that is recessed with respect to the concave portion is disposed in a close contact state or a joined state on the inner peripheral surface of the bolt fastening through hole.

  The end face of the positioning collar is not formed in a high friction form, but a recess is provided on the surface facing the at least two bolt fastening through holes in the cylinder head, and the end of the positioning collar is lowered with respect to the recess when the bolt is fastened. It may be adopted.

  Even with such a configuration, the positioning collar is arranged in close contact with or joined to the inner peripheral surface of the bolt fastening through-hole, so that the cylinder head cover is determined by the position of the positioning collar in the arrangement on the cylinder head. The

  When the cylinder head cover is bolted and the end portion of the positioning collar falls into the concave portion of the cylinder head, the positioning collar is not displaced on the cylinder head. For this reason, even if the cylinder head cover integrated with the positioning collar is deformed due to a change in temperature, a change in internal pressure, or the like, the arrangement on the cylinder head does not deviate from the state at the time of bolt fastening.

  By preventing the displacement of the cylinder head cover in this way, even when the internal combustion engine functional device is disposed on the cylinder head cover, it is possible to prevent a decrease in the positional accuracy of the internal combustion engine functional device with respect to the cylinder head. it can.

  The cylinder head cover mounting structure according to claim 10 is characterized in that, in claim 9, substantially the entire structure including the bolt fastening through hole forming portion is made of resin, and the positioning collar is made of metal. To do.

  A metal positioning collar is applied to the cylinder head cover made of resin in such a configuration. As a result, the peripheral portion of the bolt fastening through-hole can be prevented from being deformed or damaged by bolt fastening, and the displacement of the cylinder head cover is prevented, so that the position of the functional device for the internal combustion engine disposed on the cylinder head cover is prevented. A reduction in accuracy can be prevented.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view of the upper part of a cylinder head of an internal combustion engine to which the above-described invention is applied. A cylinder head cover 2 is disposed on the cylinder head H, and an oil control valve (hereinafter referred to as “OCV”) 6 is mounted on an upper portion of a resin cylinder head cover body 4 that occupies substantially the entire cylinder head cover 2. A part 8 is provided.

  Here, when the cylinder head cover body 4 is integrally molded with resin, a cylindrical metal sleeve 10 is integrated with the mounting portion 8 of the cylinder head cover body 4 by insert molding. The sleeve 10 is formed with five oil holes 10a, 10b, 10c, 10d, and 10e corresponding to the five ports 6a, 6b, 6c, 6d, and 6e of the OCV 6.

  Among these, the hydraulic oil is supplied from the cylinder head H side to the hydraulic oil supply oil hole 10 b through a supply oil passage formed in the cylinder head cover body 4. The hydraulic oil supplied into the sleeve 10 from the hydraulic oil supply oil hole 10b is selectively supplied to the retard-side oil hole 10d and the advance-side oil hole 10e by switching the OCV 6, which is a spool valve. . These oil holes 10d and 10e are connected to connection oil passages 12a and 12b penetrating through the connection portion 12 integrally formed of resin in the cylinder head cover body 4 in a state of dropping from the mounting portion 8. The lower surface of the connecting portion 12 is in contact with the upper surface of the cam cap 14 in close contact. As a result, the connecting oil passages 12a and 12b are connected to the retard-side oil passage 14a and the advance-side oil passage 14b formed in the cam cap 14, respectively. The retard angle side oil passage 14a and the advance angle side oil passage 14b are formed in the camshaft 16 supported by the cam cap 14 and the cylinder head H in the axial direction, and the retard angle side oil passage 16a and the advance angle oil passage 14b. Each is connected to the corner side oil passage 16b. As a result, hydraulic oil can be supplied to and discharged from the variable valve mechanism 18 for adjusting the valve timing provided at the tip of the camshaft 16.

  When the OCV 6 supplies hydraulic oil to the retarding hydraulic chamber of the variable valve mechanism 18 via the oil hole 10d, the connecting oil path 12a, and the retard side oil paths 14a and 16a, the variable valve mechanism 18 is connected to the camshaft 16. Is rotated relative to the timing sprocket 20 toward the retard side. As a result, the valve timing of a valve (intake valve or exhaust valve) driven by the camshaft 16 can be retarded. At this time, hydraulic oil is discharged from the advance hydraulic chamber of the variable valve mechanism 18 to the OCV 6 through the advance side oil passages 16b and 14b, the connection oil passage 12b, and the oil hole 10e. The discharged hydraulic oil is discharged from the port 6c to the discharged oil hole 10c. Since the oil discharge hole 10 c is opened in the cylinder head cover 2, the hydraulic oil is discharged into the cylinder head cover 2.

  When the OCV 6 supplies hydraulic oil to the advance hydraulic chamber of the variable valve mechanism 18 via the oil hole 10e, the connection oil path 12b, and the advance side oil paths 14b and 16b, the variable valve mechanism 18 is connected to the camshaft 16. Is rotated relative to the timing sprocket 20 in the advance side. As a result, the valve timing of the valve driven by the camshaft 16 can be advanced. At this time, hydraulic oil is discharged from the retarding hydraulic chamber of the variable valve mechanism 18 to the OCV 6 through the retarding-side oil passages 16a, 14a, the connection oil passage 12a, and the oil hole 10d. The discharged hydraulic oil is discharged from the port 6a to the discharged oil hole 10a. Since the oil discharge hole 10 a is open in the cylinder head cover 2, the hydraulic oil is discharged into the cylinder head cover 2.

  A plurality of bolt fastening portions 22 are formed in the peripheral portion of the cylinder head cover body 4 itself so as to surround the entire cylinder head cover 2. 2 is a perspective view of one bolt fastening portion 22, FIG. 3 is a longitudinal perspective view thereof, FIG. 4 is a plan view, FIG. 5 is a front view, and FIG. 6 is an exploded perspective view. In addition, you may provide a bolt fastening part not only in the periphery part of the cylinder head cover main body 4 as shown in figure but in the center part of the cylinder head cover main body 4. FIG.

  The bolt fastening portion 22 is formed with a bolt fastening through-hole 22a whose axis is perpendicular to the mounting surface P of the cylinder head H. A collar 24 having the same outer diameter as the inner diameter of the through hole 22a is inserted into the through hole 22a in a close contact state. Therefore, if the positions of at least two collars 24 are determined on the mounting surface P of the cylinder head H, the position of the cylinder head cover body 4 is determined, and the position of the entire cylinder head cover 2 is also determined.

  The collar 24 has a configuration as shown in FIG. 7A is a plan view, FIG. 7B is a front view, FIG. 7C is a top view, and FIG. 7D is a bottom view. The collar 24 is made of metal, here an iron alloy, and has a cylindrical shape as a whole. The upper end surface 24a has a planar shape, but the lower end surface 24c has a large number of convex portions 24b, thereby realizing a high friction form. Such a large number of convex portions 24b are formed by knurling, for example.

  The outer peripheral surface 24d of the collar 24 is in close contact with the through hole 22a as described above, but the inner diameter of the collar 24 is larger than the outer diameter of the shaft portion of the fastening bolt 26 that passes through the center hole 24e. As a result, when the fastening bolt 26 is loosened, there is a margin for adjustment in adjusting the position of the cylinder head cover 2 with respect to the threaded hole 30 on the cylinder head H side.

  In order to attach the cylinder head cover 2 to the cylinder head H, the cylinder head cover 2 is first disposed on the attachment surface P. The collar 24 is disposed in the bolt fastening through hole 22a of the cylinder head cover body 4 and the convex portion 24b is inserted toward the mounting surface P side. Alternatively, the cylinder 24 is disposed on the mounting surface P after the collar 24 is disposed in the through hole 22a in advance. In this arrangement work, the connecting oil passages 12a and 12b of the connecting portion 12 provided in a suspended state from the mounting portion 8 of the cylinder head cover body 4 are connected to the oil passages 14a and 14b on the cam cap 14 side with high positional accuracy. To be adjusted.

  Then, the washer 28 is disposed in the through hole 22a, the fastening bolt 26 is inserted into the center hole 28a of the washer 28 and the center hole 24e of the collar 24, and the fastening bolt 26 is inserted into the screwing hole 30 formed in the mounting surface P. The screw part 26a is screwed.

  Note that, before the position of the cylinder head cover 2 is adjusted, the fastening bolts 26 may be inserted in advance into the screwing holes 30 as described above. If the fastening bolt 26 is loosened, the position can be adjusted by moving the cylinder head cover 2 by the adjustment allowance described above. After this adjustment, the fastening bolt 26 is further screwed into the screw hole 30.

  After the position of the cylinder head cover 2 is adjusted, when the cylinder head cover 2 is simply placed on the mounting surface P, the upper surface 22b of the bolt fastening portion 22 is secured by the gasket 32 disposed on the edge of the cylinder head cover body 4. The distance between the mounting surface P and the mounting surface P is slightly larger than the length of the collar 24. For this reason, in the initial stage of the bolt fastening operation, the washer 28 pushed by the head portion 26 b of the fastening bolt 26 presses the upper surface 22 b of the bolt fastening portion 22.

  When the gasket 32 is compressed to some extent between the cylinder head cover body 4 and the mounting surface P as the fastening bolts 26 are screwed in, the washer 28 now also presses the upper end surface 24 a of the collar 24. As a result, the lower end surface 24c side of the collar 24 is strongly pressed against the mounting surface P. Accordingly, the plurality of convex portions 24b provided on the lower end surface 24c are strongly pressed onto the region 34 (FIG. 6) indicated by broken line hatching on the attachment surface P. Here, since the cylinder head H is made of an aluminum alloy, the tip of the convex portion 24 b of the collar 24 made of an iron alloy bites into the cylinder head H on the mounting surface P. Even if the cylinder head H side is made of the same iron alloy as that of the collar 24, some biting is performed.

  As a result, the collar 24 is firmly positioned with respect to the mounting surface P, and in conjunction with this, the cylinder head cover 2 is also firmly positioned on the mounting surface P. As a result, the connecting positions of the connecting oil passages 12a, 12b of the connecting portion 12 formed in the cylinder head cover body 4 and the oil passages 14a, 14b on the cam cap 14 side can be maintained in a highly accurate state. Since the fastening force of the fastening bolt 26 that is increased thereafter is received by the collar 24 side while the gasket 32 is compressed to some extent, even if the screwing force of the fastening bolt 26 is increased, the resin bolt The fastening portion 22 is protected from deformation and breakage. That is, the collar 24 functions as both a high friction collar and a reinforcing collar.

  When the OCV 6 is mounted on the mounting portion 8 as shown in FIG. 1, the supply of hydraulic oil to the variable valve mechanism 18 is controlled by the electronic control unit (hereinafter referred to as “ECU”) 36 via the OCV 6. Thus, the valve timing can be adjusted according to the operating state of the internal combustion engine.

  Here, for the configuration of the claims, the cylinder head cover 2 mainly including the cylinder head cover main body 4 corresponds to an attachment member, and the cylinder head H corresponds to a counterpart member.

According to the first embodiment described above, the following effects can be obtained.
(I). The collar 24 is arranged in close contact with the inner peripheral surface of each through-hole 22a in a plurality of bolt fastening portions 22 formed in the cylinder head cover body 4. Thus, the collar 24 is integrated with the cylinder head cover 2 in the arrangement on the cylinder head H. Therefore, if the position of the collar 24 on the cylinder head H is determined, the position of the cylinder head cover 2 is also determined.

  Since the collar 24 has a lower friction surface 24c that is in contact with the cylinder head H, the collar 24 is less likely to be displaced on the cylinder head H when bolted and brought into contact with the cylinder head H. . For this reason, the cylinder head cover 2 integrated with the collar 24 in the arrangement on the cylinder head H is also less likely to be displaced from the state at the time of bolt fastening.

  By preventing the cylinder head cover 2 from being displaced by the collar 24 as described above, even if the cylinder head cover 2 is deformed due to a change in temperature or a change in internal pressure, the displacement of the cylinder head cover 2 is unlikely to occur. Therefore, it is possible to prevent the position accuracy of the OCV 6 disposed on the cylinder head cover 2 from being lowered with respect to the cylinder head H.

  Therefore, a highly accurate connection state is maintained between the connection oil passages 12a and 12b of the connection portion 12 formed in the cylinder head cover body 4 and the oil passages 14a and 14b on the cam cap 14 side. As a result, smooth hydraulic oil supply / discharge from the OCV 6 to the variable valve mechanism 18 can be maintained, and smooth control of the variable valve mechanism 18 by the ECU 36 can be maintained.

  (B). The high-friction form of the collar 24 is realized by forming the unevenness, in particular, the convex portion 24b so as to be sharp, so that the convex portion 24b strongly bites into the cylinder head H side when the bolt is fastened, and the high-friction state is easily achieved. Can be generated. As a result, even if the cylinder head cover 2 is deformed after the cylinder head cover 2 is bolted to the cylinder head H or the deformation is repeated, displacement of the bolt fastening portion 22 in the through hole 22a is prevented. . For this reason, displacement of the entire cylinder head cover 2 is also prevented, the position of the OCV 6 on the cylinder head cover 2 is maintained with high accuracy, and the oil passage connection by the connecting portion 12 can be maintained with high accuracy.

  (C). The collar 24 is made of an iron alloy and easily bites into the aluminum alloy cylinder head H, and reinforces the bolt fastening portion 22 of the resin cylinder head body 4 as a reinforcing collar.

  As a result, in the cylinder head cover 2 that is substantially made of resin including the bolt fastening portion 22, it is possible to prevent the peripheral portion of the through hole 22a from being deformed or damaged by bolt fastening. In addition, even if the cylinder head cover 2 is deformed as described above, the displacement of the cylinder head cover 2 is effectively prevented, so that the positional accuracy of the OCV 6 on the cylinder head cover 2 is not lowered, and the connecting portion 12 The oil passage connection by can be maintained with higher accuracy.

[Embodiment 2]
The attachment structure of the cylinder head cover 102 of the present embodiment is shown in FIGS. 8 is a perspective view of one bolt fastening portion 122, FIG. 9 is a longitudinal perspective view thereof, and FIG. 10 is an exploded perspective view thereof. The mounting portion, the connecting portion, the cam cap, and the oil passage formed in these portions are the same as those in the first embodiment. Further, a bolt fastening portion may be provided not only in the peripheral portion of the cylinder head cover main body 104 as shown, but also in the central portion of the cylinder head cover main body 104.

  The bolt fastening portion 122 is formed with a bolt fastening through-hole 122a whose axis is a direction perpendicular to the mounting surface Q of the cylinder head I. A collar 124 having the same outer diameter as that of the through hole 122a is inserted. Therefore, if the positions of at least two collars 124 are determined on the mounting surface Q, the position of the cylinder head cover main body 104 is determined, and the position of the entire cylinder head cover 102 is also determined.

  The collar 124 has a configuration as shown in FIG. 11A is a plan view, FIG. 11B is a front view, FIG. 11C is a top view, and FIG. 11D is a bottom view. The collar 124 is made of metal, here an iron alloy, and has a cylindrical shape as a whole. Both the upper end surface 124a and the lower end surface 124b have a planar shape, but the outer peripheral portion forms a tapered surface 124c on the lower end surface 124b side, and the wall thickness gradually decreases as the lower end surface 124b is approached.

  As described above, the outer peripheral surface 124d of the collar 124 has the same diameter as the through hole 122a, but the inner diameter of the collar 124 is made larger than the outer diameter of the shaft portion of the fastening bolt 126 that passes through the center hole 124e.

  In order to attach the cylinder head cover 102 to the cylinder head I, first, the cylinder head cover 102 is disposed on the attachment surface Q. The collar 124 is inserted into the bolt fastening through-hole 122a of the cylinder head cover main body 104 so that the lower end surface 124b side where the tapered surface 124c exists is directed toward the mounting surface Q side. Alternatively, after the collar 124 is disposed in the through hole 122a in advance, the cylinder head cover 102 is disposed on the attachment surface Q. In this arrangement work, the connecting oil passage of the connecting portion provided in a suspended state from the mounting portion of the cylinder head cover main body 104 is adjusted to be connected to the oil passage on the cam cap side with high positional accuracy.

  As shown in the longitudinal sectional view of FIG. 12, the mounting surface Q has a recess 131 formed around the screwing hole 130, and the inner peripheral surface of the recess 131 has a tapered shape corresponding to the tapered surface 124 c of the collar 124. A surface 131a is formed. Therefore, the tapered surface 124c portion of the collar 124 falls into the recess 131, and the position of the collar 124 on the mounting surface Q is fixed, and at the same time, the position of the cylinder head cover 102 is fixed.

  The washer 128 is disposed in the through hole 122a, the fastening bolt 126 is inserted into the central hole 128a of the washer 128 and the central hole 124e of the collar 124, and the fastening bolt 126 is inserted into the screwing hole 130 formed in the mounting surface Q. Screw part 126a is screwed.

  In a state where the cylinder head cover 102 is simply placed on the mounting surface Q, the distance between the upper surface 122b of the bolt fastening portion 122 and the mounting surface Q is determined by the collar 124 by the gasket 132 disposed on the edge of the cylinder head cover main body 104. In FIG. 5, the length of the portion above the mounting surface Q is slightly larger than the length of the portion. For this reason, in the initial stage of the bolt fastening operation, the washer 128 pushed by the head 126 b of the fastening bolt 126 presses the upper surface 122 b of the bolt fastening portion 122.

  When the gasket 132 is compressed to some extent between the cylinder head cover body 104 and the mounting surface Q as the fastening bolt 126 is screwed, the washer 128 also presses the upper end surface 124 a of the collar 124. As a result, the tapered surface 124 c of the collar 124 is pressed in the recess 131. As a result, the collar 124 is firmly fixed and positioned by the recess 131.

  Therefore, the cylinder head cover 102 is firmly positioned with respect to the mounting surface Q, and the connection position between the connection oil passage in the connecting portion formed in the cylinder head cover body 104 and the oil passage on the cam cap side can be maintained in a highly accurate state. . Since the fastening force of the fastening bolt 126 that is increased thereafter is received by the collar 124 side in a state where the gasket 132 is compressed to some extent, even if the screwing force of the fastening bolt 126 is increased, the resin bolt The fastening part 122 is protected from deformation and breakage. That is, the collar 124 functions as both a positioning collar and a reinforcing collar.

  As described in the first embodiment, when the OCV is mounted on the mounting portion, the ECU controls the hydraulic oil supply to the variable valve mechanism via the OCV. It becomes possible to adjust according to the operating state of the engine.

  Here, in the configuration of the claims, the cylinder head cover 102 mainly including the cylinder head cover main body 104 corresponds to an attachment member, and the cylinder head I corresponds to a counterpart member.

According to the second embodiment described above, the following effects can be obtained.
(I). A recess 131 is formed on the mounting surface Q of the cylinder head I at a position facing the bolt fastening through-hole 122a, and the end of the collar 124 on the lower end surface 124b side falls when the bolt is fastened. Further, the collar 124 is disposed in close contact with the inner peripheral surface of the bolt fastening through hole 122a.

  As a result, the collar 124 is prevented from being displaced on the cylinder head I, and the cylinder head cover 102 is restricted by the collar 124 in the arrangement on the cylinder head I, and the cylinder head cover 102 is deformed or repeatedly deformed. However, the position does not shift from the state when the bolt is fastened.

  By preventing the displacement of the cylinder head cover 102 in this way, it is possible to prevent the position accuracy of the OCV disposed on the cylinder head cover 102 from being lowered with respect to the cylinder head I.

  In this way, since the connecting oil passage of the connecting portion formed in the cylinder head cover body 104 and the oil passage on the cam cap side are maintained in a highly accurate connection state, smooth operating oil from the OCV to the variable valve mechanism is maintained. Supply and discharge can be maintained, and smooth control of the variable valve mechanism by the ECU can be maintained.

(B). The effect (c) of the first embodiment is produced.
[Other embodiments]
(A). In the above-described embodiment, a cam cap is used as an internal mechanism disposed on the cylinder head side of the internal combustion engine, and an OCV connected to the cam cap is used as a functional device for an internal combustion engine that functions by being connected thereto. Corresponded. In addition, the internal mechanism may be a rotor that is fixed to a camshaft and rotates together, and the internal combustion engine functional device that functions opposite the internal mechanism may be a cam angle sensor.

  Even in such a configuration, the effects described in the first or second embodiment can be produced, and the position of the cam angle sensor is determined with high accuracy, so that the cam angle can be detected with high accuracy.

  (B). In the above embodiment, the direction in which the OCV 6 is mounted in the mounting portion 8 shown in FIG. 1 is orthogonal to the axial direction of the camshaft 16, but the OCV6 is mounted along the axial direction of the camshaft 16. The mounting portion 8 may be formed as described above. Further, the OCV 6 may be mounted in the middle direction. Further, the OCV 6 may be disposed so that the tip of the OCV 6 is lowered so that the leaked or discharged hydraulic oil can easily return into the cylinder head cover 2.

  (C). 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 this makes the cylinder head cover body itself easily deformed, the above-described collar is arranged at the bolt fastening portion to increase the positional accuracy. Can be maintained.

  (D). In each of the above embodiments, the collar is formed separately from the cylinder head cover main body and inserted into the through hole of the bolt fastening part. A collar may be bonded to the through hole.

  (E). In each of the above embodiments, the collars are arranged in all the bolt fastening portions provided in the cylinder head cover main body. However, if the collars are arranged in at least two bolt fastening portions, the collars in the other bolt fastening portions are colored. The bolts may be directly fastened without arranging them. Also with this configuration, the positional deviation of the cylinder head cover is prevented, so that it is possible to prevent the position accuracy of the OCV and the cam angle sensor disposed on the cylinder head cover from being lowered.

FIG. 3 is a longitudinal sectional view of a cylinder head upper constituent part according to the first embodiment. The perspective view of a bolt fastening part similarly. The longitudinal section perspective view of a bolt fastening part similarly. The top view of a bolt fastening part similarly. The front view of a bolt fastening part similarly. The exploded perspective view of a bolt fastening part similarly. Similarly, a color explanatory diagram of the color. The perspective view of the bolt fastening part of Embodiment 2. FIG. The longitudinal section perspective view of a bolt fastening part similarly. The exploded perspective view of a bolt fastening part similarly. Similarly, a color explanatory diagram of the color. Similarly, a longitudinal sectional view when the cylinder head cover is attached.

Explanation of symbols

  2 ... Cylinder head cover, 4 ... Cylinder head cover body, 6 ... OCV, 6a, 6b, 6c, 6d, 6e ... Port, 8 ... Mounting part, 10 ... Sleeve, 10a, 10b, 10c, 10d, 10e ... Oil hole, 12 ... Connection part, 12a, 12b ... Connection oil passage, 14 ... Cam cap, 14a, 14b ... Oil passage, 16 ... Camshaft, 16a, 16b ... Oil passage, 18 ... Variable valve mechanism, 20 ... Timing sprocket, 22 ... Bolt fastening portion, 22a ... through hole, 22b ... upper surface, 24 ... collar, 24a ... upper end surface, 24b ... convex portion, 24c ... lower end surface, 24d ... outer peripheral surface, 24e ... center hole, 26 ... fastening bolt, 26a ... screw Part, 26b ... head, 28 ... washer, 28a ... center hole, 30 ... screw hole, 32 ... gasket, 34 ... area, 36 ... ECU, 102 ... cylinder head cover, 1 4 ... Cylinder head cover body, 122 ... Bolt fastening portion, 122a ... Through hole, 122b ... Upper surface, 124 ... Collar, 124a ... Upper end surface, 124b ... Lower end surface, 124c ... Tapered surface, 124d ... Outer peripheral surface, 124e ... Center hole, 126 ... Fastening bolt, 126a ... Screw part, 126b ... Head, 128 ... Washer, 128a ... Center hole, 130 ... Screw hole, 131 ... Recess, 131a ... Tapered surface, 132 ... Gasket, H, I ... Cylinder head, P, Q: Mounting surface.

Claims (10)

A reinforcing collar that is arranged in close contact with or joined to the inner peripheral surface of the through hole of the mounting member, and that reinforces the mounting member when the bolt is inserted into the through hole and the mounting member is bolted to the mating member. There,
A reinforcing collar characterized in that an end surface that comes into contact with the mating member at the time of bolt fastening is in a high friction form. The reinforcing collar according to claim 1, wherein the end surface that contacts the mating member is formed with irregularities so that a high friction form is realized. The reinforcing collar according to claim 2, wherein the convex portion of the end face is formed in a sharp shape. In any one of Claims 1-3, in order to reinforce the attachment member in which the formation part of the said through-hole is resin, it is formed with the material more rigid than resin of the formation part of the said through-hole. Characteristic for reinforcement. 5. The reinforcing collar according to claim 4, wherein the reinforcing collar is made of metal. A cylinder head cover in which a function device for an internal combustion engine that functions to be connected or opposed to an internal mechanism disposed on the cylinder head side of the internal combustion engine is disposed,
A plurality of bolt fastening through holes are provided, and a high friction collar whose end face contacts the cylinder head in a high friction state is in close contact with an inner peripheral surface of at least two of the plurality of bolt fastening through holes. Or the cylinder head cover characterized by arrange | positioning in the joining state. The cylinder head cover according to claim 6, wherein the reinforcing collar according to any one of claims 1 to 5 is used as the high friction collar. 8. The cylinder head cover according to claim 6, wherein substantially the entire portion including a portion where the bolt fastening through hole is formed is made of resin, and the high friction collar is made of metal. A cylinder head cover mounting structure in which a function device for an internal combustion engine that functions as being connected to or opposed to an internal mechanism disposed on the cylinder head side of the internal combustion engine,
The cylinder head cover is provided with a plurality of bolt fastening through-holes, the cylinder head is provided with a recess on a surface facing at least two of the plurality of bolt fastening through-holes, and the cylinder head cover An attachment structure for a cylinder head cover, wherein a positioning collar having a depressed end is disposed in close contact with or joined to an inner peripheral surface of the bolt fastening through hole. 10. The cylinder head cover mounting structure according to claim 9, wherein substantially the entire portion including the bolt fastening through hole forming portion is made of resin, and the positioning collar is made of metal.

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