JP5063405B2 - Cylinder head device, internal combustion engine equipped with the same, and method of manufacturing cylinder head device - Google Patents

Description

  The present invention relates to a cylinder head device, an internal combustion engine including the same, and a method for manufacturing the cylinder head device.

Conventionally, as this type of cylinder head device, an intake side camshaft that drives an intake valve, and an exhaust side camshaft that is provided with a variable valve timing mechanism at the shaft end and variably drives the valve timing of the exhaust valve, A bearing that is rotatably supported by a bearing formed by a cylinder head and a cam bracket has been proposed.
In this cylinder head device, the lubrication of the journal portion of the intake side camshaft is performed by forming a lubrication groove on the inner peripheral surface of the intake side bearing portion, and supplying lubricating oil to this lubrication groove. The journal portion is lubricated by lubricating oil flowing through a control oil passage formed on the inner peripheral surface of the exhaust-side bearing portion for supplying lubricating oil to the variable valve timing mechanism.
JP 10-317933 A

By the way, even if the engine is mounted on the same vehicle type, the specification may differ depending on the grade of the vehicle type. For example, a variable valve timing mechanism is provided only for high-grade models for the purpose of improving fuel efficiency and increasing output.
In general, even for engines with different specifications, it is preferable to share parts as much as possible from the viewpoint of incorrect assembly and parts management man-hours. It is necessary to change the bracket.

The cylinder head device, the internal combustion engine including the cylinder head device, and the method of manufacturing the cylinder head device according to the present invention have an object of sharing a cam bracket regardless of specifications.
A cylinder head device of the present invention, an internal combustion engine including the cylinder head device, and a method of manufacturing the cylinder head device are one of the objects to improve the assembling property, and in order to achieve at least a part of the above object, I took the measures.

The present invention is a cylinder head device comprising: a first camshaft that drives a first engine valve; and a second camshaft that is arranged in parallel to the first camshaft and drives a second engine valve,
In the first case where the variable cam timing mechanism is not provided on the second camshaft, a first oil passage through which oil flows is formed, and the second camshaft is provided with the variable valve timing mechanism. In this case, a cylinder head in which a second oil passage through which the oil flows in addition to the first oil passage is formed;
A first supply path for rotatably supporting the first journal portion of the first camshaft and supplying the oil to the first journal portion in communication with the first oil passage is formed on an inner peripheral surface. A first bearing portion and a second journal portion of the second camshaft are rotatably supported and formed on an inner peripheral surface capable of supplying the oil to the second journal portion via the first supply path. A cam bracket having a second bearing portion that is capable of communicating with a second supply path and the second oil flow path and that is formed with a control flow path that guides the oil to the variable valve timing mechanism;
In the first case, the communication cut-off means communicates the first supply path and the second supply path, and in the second case, cuts off the first supply path and the second supply path. When,
It is a summary to provide.

  In the cylinder head device of the present invention, when the variable valve timing mechanism is not provided on the second camshaft, the first supply path and the second supply path are communicated, and the variable valve timing mechanism is connected to the second camshaft. If provided, by providing a communication blocking means for blocking the first supply path and the second supply path, the communication blocking means only connects and blocks each flow path, so that the specification of the internal combustion engine is different. Because it is possible, it is not necessary to set a cam bracket for each specification. As a result, the cam bracket can be shared regardless of the specifications. In addition, it is possible to avoid an erroneous mounting of the cam bracket.

In the cylinder head device of the present invention, the cam bracket has a weir portion that separates the first supply path and the second supply path,
In the first case, the communication blocking means includes a communication recess that communicates the first supply path and the second supply path with a contact portion provided at a position corresponding to the dam portion of the cylinder head. By forming the first supply path and the second supply path, the first supply path and the second supply path are brought into contact with the contact portion in the second case. It can also be a means for preventing communication with the two supply paths.
In this way, the cam bracket is provided with a dam part that separates the first flow path and the second flow path, and a contact part that contacts the dam part is provided at a position corresponding to the dam part of the cylinder head. Whether the valve timing mechanism is provided on the second camshaft or not can be dealt with depending on whether or not the recess is formed in the part. That is, since it is not necessary to set a cam bracket for each specification, the cam bracket can be shared regardless of the specification of the internal combustion engine. In addition, it is possible to avoid an erroneous mounting of the cam bracket.

In the cylinder head device of the present invention, the communication recess may be formed in the contact portion by machining.
If it carries out like this, a communication recessed part can be formed easily.

In the cylinder head device of the present invention, the first camshaft is an exhaust side camshaft that drives an exhaust valve as the first engine valve, and the second camshaft is an intake valve as the second engine valve. It can also be an intake side camshaft that drives the.
In this way, since the variable valve timing mechanism is provided on the intake camshaft, the valve timing of the intake valve can be made variable.

An internal combustion engine of the present invention comprises the cylinder head device according to any one of claims 1 to 4 and is configured to drive the first camshaft and the second camshaft by utilizing rotation of a crankshaft. Can do.
In this case, since the cylinder head device according to any one of the above-described aspects of the present invention is provided, the same effect as the effect of the cylinder head device according to the present invention, for example, sharing of the cam bracket regardless of the specifications is achieved. It is possible to achieve the effect of avoiding the mounting error of the cam bracket and the cam bracket.

Further, the cylinder head device manufacturing method of the present invention includes a first camshaft that drives the first engine valve, and a second camshaft that is arranged in parallel to the first camshaft and drives the second engine valve. A cylinder head device manufacturing method comprising:
(A) In the first case where the variable valve timing mechanism is not provided on the second camshaft, a first cylinder head having a first oil passage through which oil flows is prepared,
(B) In the second case in which the variable valve timing mechanism is provided on the second camshaft, a second cylinder head in which a second oil passage through which the oil flows is formed in addition to the first oil passage. Prepare
(C) having a first bearing portion that rotatably supports the first journal portion of the first camshaft and a second bearing portion that rotatably supports the second cam journal portion of the second camshaft; A first supply passage that communicates with the first oil passage and supplies the oil to the first journal portion is formed on the inner peripheral surface of the first bearing portion, and is formed on the inner peripheral surface of the second bearing portion. Can communicate with the second oil passage and the second supply passage for supplying the oil to the second journal portion via the first supply passage, and can guide the oil to the variable valve timing mechanism. Prepare a cam bracket with a control flow path,
(D) In the first case, the cam bracket is disposed on the first cylinder head so that the first supply path and the second supply path communicate with each other;
(E) In the second case, the cam bracket may be arranged in the second cylinder head so that the first supply path and the second supply path are blocked.
In this way, in the method of manufacturing the cylinder head device of the present invention, when the variable valve timing mechanism is not provided on the second camshaft, the first supply path and the second supply path are communicated to each other, and the second camshaft When the variable valve timing mechanism is provided, the first supply path and the second supply path are shut off, and the second oil flow path and the control flow path are connected to each other, thereby connecting and blocking each flow path. It is not necessary to set a cam bracket for each specification because it corresponds to the specification difference of the internal combustion engine. As a result, the cam bracket can be shared regardless of the specifications. In addition, it is possible to avoid an erroneous mounting of the cam bracket.

Moreover, in the manufacturing method of the cylinder head device of the present invention, the step (c) is a step of forming the first supply path and the second supply path separated by a dam portion,
In the step (d), the first supply path and the first supply path are formed by forming a communication recess that connects the first supply path and the second supply path at a position corresponding to the dam portion of the first cylinder head. A step of communicating with the second supply path;
In the step (e), a contact portion that comes into contact with the dam portion is provided at a position corresponding to the dam portion of the second cylinder head, and the dam portion and the contact portion are brought into contact with each other. A configuration in which communication between the first supply path and the second supply path is prevented can also be adopted.
If it carries out like this, the 1st flow path and the 2nd flow path will be isolated by a dam part, the contact part which contact | abuts a dam part will be provided in the position corresponding to the dam part of a cylinder head, and a recessed part will be formed in this contact part Whether the valve timing mechanism is provided on the second camshaft or not can be dealt with depending on whether or not it is performed. That is, since it is not necessary to set a cam bracket for each specification, the cam bracket can be shared regardless of the specification of the internal combustion engine. In addition, it is possible to avoid an erroneous mounting of the cam bracket.

Next, the best mode for carrying out the present invention will be described using examples.
FIG. 1 is a configuration diagram showing an outline of a configuration of an engine 1 on which a cylinder head device 100 according to an embodiment which is an embodiment of the present invention is mounted. FIG. 2 is a diagram of an embodiment which is an embodiment of the present invention. FIG. 3 is a configuration diagram showing an outline of the configuration of an engine 1A equipped with a cylinder head device 100A, FIG. 3 is an exploded perspective view showing an outline of the configuration of the cylinder head device 100 as an embodiment, and FIG. FIG. 5 is an enlarged plan view showing a part of the cylinder head device 100 which is an enlarged view, FIG. 5 is an exploded perspective view showing an outline of the configuration of the cylinder head device 100A which is an embodiment, and FIG. FIG. 2 is an enlarged plan view showing a part of a cylinder head device 100A.
As shown in FIGS. 1 and 2, the engine 1, 1 </ b> A including the cylinder head devices 100, 100 </ b> A of the embodiment is connected via a cylinder block 2 and a timing chain 7 wound around a crankshaft sprocket 6 a of the crankshaft 6. The cylinder head device 100, 100A of the embodiment attached to the upper surface side of the cylinder block 2, the cylinder head cover 4 attached to the upper surface side of the cylinder head device 100, 100A of this embodiment, and the crankshaft sprocket of the crankshaft 6. An oil pump 14 attached to the cylinder block 2 via a chain 13 wound around 6a, and an oil pan 5 disposed on the lower surface side of the cylinder block 2 for storing oil as lubricating oil or hydraulic oil To the cylinder of the embodiment using the power from the crankshaft 6. It is configured to drive the de-device 100,100A and the oil pump 14.

  As shown in FIGS. 3 and 4, the cylinder head device 100 according to the embodiment includes an exhaust side camshaft 8 having a plurality of cams 8b for operating an exhaust valve (not shown), and an intake valve (not shown). The intake camshaft 10 is formed with a plurality of cams 10b for operating the intake and the intake valve (not shown) is opened and closed according to the operating state of the engine 1 attached to the tip of the intake camshaft 10. The variable valve timing mechanism 12 to be rotated, the cylinder head 3 that rotatably supports the exhaust side camshaft 8 and the intake side camshaft 10, and the journal portion 8a of the exhaust side camshaft 8 and the intake side camshaft 10 together with the cylinder head 3. The cam brackets 29 and 34 forming the bearing of the journal portion 10a and the control for controlling the operation of the variable valve timing mechanism 12 are controlled. And a valve 23.

  The cylinder head device 100A according to the embodiment has a hardware configuration in which the variable valve timing mechanism 12 and the control valve 23 are removed from the same hardware configuration as the cylinder head device 100 according to the above-described embodiment. That is, as shown in FIGS. 5 and 6, the cylinder head device 100 </ b> A according to the embodiment includes an exhaust side camshaft 8 formed with a plurality of cams 8 b for operating an exhaust valve (not shown), and an intake valve (not shown). The intake side camshaft 10 in which a plurality of cams 10b are formed, the exhaust side camshaft 8 and the intake side camshaft 10 are rotatably supported, and the exhaust side camshaft together with the cylinder head 3A. 8 journal portions 8a and cam brackets 29 and 34 forming bearings for the journal portion 10a of the intake camshaft 10.

FIG. 7 is an external plan view showing the external appearance of the cylinder head 3 when viewed from above, and FIG. 8 is a cross-sectional view schematically showing the configuration of the oil passage formed in the cylinder head 3.
As shown in FIGS. 7 and 8, the cylinder head 3 includes a bearing portion 15 that rotatably receives a substantially lower half of the journal portion 8 b of the exhaust camshaft 8, and a journal portion 10 b of the intake camshaft 10. A bearing 16 that rotatably receives the lower half, a valve lifter boss 19 that is driven by cams 8b and 10b and that opens and closes a valve lifter (not shown) that opens and closes an intake valve and an exhaust valve, and lubrication An oil passage 21a through which oil as oil flows, control passages 21b, 26a, 26b through which oil as hydraulic oil for operating the variable valve timing mechanism 12 and a control valve chamber for housing the control valve 23 22, a head bolt 33 for attaching the cam bracket 29, and a head bolt for attaching the cam bracket 34. Bolt holes 18a (not shown) is screwed, 18b, 18c, 20 and are formed.

As shown in FIG. 8, the oil passage 21a is formed so as to communicate from the mating surface 300 of the cylinder head 3 with the cylinder block 2 to the mounting surface 302 to which the cam bracket 29 of the cylinder head 3 is attached. Oil as lubricating oil supplied from the pump 14 flows from the mating surface 300 toward the mounting surface 302.
The control flow path 21b is formed so as to communicate from the mating surface 300 to the control valve chamber 22 through the oil filter 25, and the control flow paths 26a and 26b extend from the mounting surface 302 to the control valve chamber 22. It is formed to communicate.
The control flow path 26a is a retarded side oil path for operating the variable valve timing mechanism 12 in a direction to delay the opening / closing timing of the intake valve (not shown), and the control flow path 26b is an intake air (not shown). It is an advance side oil passage for operating in a direction that accelerates the opening and closing timing of the valve, and oil as hydraulic oil supplied from the oil pump 14 flows from the mating surface 300 to the control valve chamber 22 and is accommodated in the control valve chamber 22. It flows from the control flow paths 26 a and 26 b opened by the control valve 23 toward the attachment surface 302. Further, the bolt hole 18 c is formed to penetrate from the mounting surface 302 to the control valve chamber 22.

FIG. 9 is an external plan view showing the external appearance of the cylinder head 3A as viewed from above, and FIG. 10 is a structural diagram showing an outline of the configuration of the oil passage formed in the cylinder head 3A.
The hardware configuration is the same as that of the cylinder head 3 described above except that the control flow paths 21b, 26a, and 26b and the control valve chamber 22 that houses the control valve 23 are excluded.
That is, as shown in FIGS. 9 and 10, the cylinder head 3 </ b> A has a bearing portion 15 that rotatably receives substantially the lower half of the journal portion 8 b of the exhaust camshaft 8, and a journal portion of the intake camshaft 10. A bearing 16 that receives the lower half of 10b in a rotatable manner, a recess 35, and a valve lifter (not shown) that is driven by cams 8b and 10b and opens and closes an intake valve and an exhaust valve (not shown) is guided. A bolt hole into which a valve lifter boss 19, an oil passage 21 a through which oil as lubricating oil flows, a head bolt 33 for attaching a cam bracket 29 and a head bolt (not shown) for attaching a cam bracket 34 are screwed. 18a, 18b, 18c, and 20 are formed.

  The recess 35 is formed by machining using a drill or the like between the bearing portion 16 of the mounting surface 302 to which the cam bracket 29 is mounted and the bolt hole 18b, and lubricates the journal portion 10b of the intake camshaft 10. A part of an oil flow path for supplying oil as oil is formed. The point that the recess 35 forms part of the oil flow path will be described in detail later.

11 is an external view showing the external appearance of the cam bracket 29, and FIG. 12 is an external view showing the external appearance when the cam bracket 29 is viewed from the arrow A side in FIG.
As shown in FIG. 11, the cam bracket 29 rotatably receives substantially the upper half of the journal portion 8b of the exhaust side camshaft 8 so that both the exhaust side camshaft 8 and the intake side camshaft 10 can be supported. A bearing portion 29a and a bearing portion 29b that rotatably receives substantially the upper half of the journal portion 10b of the intake camshaft 10 are integrally formed to support the journal portions 8b and 10b on the most variable valve timing mechanism 12 side. . The cam bracket 29 is formed with bolt holes 29c, 29c, 29c at positions corresponding to the bolt holes 18a, 18b, 18c, and the cylinder head is formed by bolts (not shown) inserted from the bolt holes 29c, 29c, 29c. It is fixedly attached to the mounting surface 302 of 3,3A.

As shown in FIG. 12, an exhaust side oil supply passage 30 capable of supplying oil as lubricating oil to the journal portion 8b is formed in a concave shape on the bearing surface 29a ′ side of the bearing portion 29a. Further, on the bearing surface 29b ′ side of the bearing portion 29b, as shown in FIG. 12, an intake side oil supply passage 31 capable of supplying oil as lubricating oil to the journal portion 10b, and a variable valve for supplying oil as working oil. The control flow paths 27a and 27b that can be supplied to the timing mechanism 12 are formed in a concave shape.
The exhaust side oil supply path 30 includes a linear groove 30a extending substantially linearly at right angles to the axial direction of the exhaust side camshaft 8, and a linear groove 30a on the bearing surface 29a ′ of the bearing portion 29a from the exhaust side camshaft 8. An extending groove 30b extending in the axial direction and a communication portion 30c communicating with the oil flow path 21a when the cam bracket 29 is attached to the cylinder heads 3 and 3A are provided.
As shown in the drawing, the intake-side oil supply path 31 includes a substantially straight linear groove 31a formed at substantially the same position as the straight groove 30a in the axial direction of the exhaust camshaft 8. A dam portion 32 is formed between the linear groove 30a and the linear groove 31a, and is blocked so as not to communicate with each other.

  The dam portion 32 is formed at a position facing the recess 35 formed in the cylinder head 3A. Further, the width of the dam portion 32 in the direction perpendicular to the axial direction of the exhaust side camshaft 8 and the intake side camshaft 10 is smaller than that of the recess 35. That is, when the cam bracket 29 is attached to the cylinder head 3A, the linear groove 30a and the linear groove 31a are configured to communicate with each other.

  When the cam bracket 29 is attached to the cylinder head 3, the control flow path 27a and the control flow path 27b are the control flow path 26a that is the retard side oil path and the control flow path that is the advance side oil path, respectively. A communication portion 27a ′ and a communication portion 27b ′ communicating with the flow path 26b are provided.

13 is a cross-sectional view showing the oil passage configuration when the cam bracket 29 is attached to the cylinder head 3, and FIG. 14 is a cross-sectional view showing the oil passage configuration when the cam bracket 29 is attached to the cylinder head 3A. is there.
When the cam bracket 29 is attached to the cylinder head 3, as shown in FIG. 13, the oil pressure-fed by the oil pump 14 and supplied to the oil passage 21a flows from the communication portion 30c to the exhaust-side oil supply passage 30. Lubrication of the journal portion 8b of the exhaust camshaft 8 is performed. Here, the oil that has flowed into the exhaust side oil supply passage 30 sufficiently lubricates the circumferential direction of the journal portion 8b via the linear groove 30a, and sufficiently lubricates the axial direction of the journal portion 8b via the extending groove 30b. To do.
Further, the oil that is pumped by the oil pump 14 and supplied from the control flow path 21b to the control flow path 26a or the control flow path 26b via the control valve 23 is controlled from the communication portion 27a ′ or the communication portion 27b ′. It flows into the flow path 27a for control and the flow path 27b for control, and is sent to the variable valve timing mechanism 12 through the shaft control oil path (not shown) formed in the intake side camshaft 10. At this time, the journal portion 10b of the intake camshaft 10 is lubricated by the oil that has flowed through the control flow channel 27a and the control flow channel 27b. Note that no oil is supplied to the intake-side oil supply passage 31.

  On the other hand, when the cam bracket 29 is attached to the cylinder head 3A, as shown in FIG. 14, the oil that is pressure-fed by the oil pump 14 and supplied to the oil passage 21a is transferred from the communication portion 30c to the exhaust-side oil supply passage 30. At the same time, it flows into the intake side oil supply passage 31 via the recess 35. The journal portion 8b of the exhaust side camshaft 8 is lubricated by the oil that has flowed to the exhaust side oil supply passage 30, and the journal portion 10b of the intake side camshaft 10 is lubricated by the oil that has flowed to the intake side oil supply passage 31. Here, as described above, the journal portion 8b is sufficiently lubricated in the circumferential direction by the linear groove 30a, and is sufficiently lubricated in the axial direction by the extending groove 30b. When the cam bracket 29 is attached to the cylinder head 3A, no oil is supplied to the control flow paths 27a and 27b.

  As described above, the cam bracket 29 can be shared by the cylinder head device 100 including the variable valve timing mechanism 12 and the cylinder head device 100A not including the variable valve timing mechanism 12. Installation mistakes can be avoided.

Next, a method for manufacturing the cylinder head devices 100 and 100A according to these embodiments will be described.
FIG. 15 is a process diagram illustrating a state of manufacturing the cylinder head devices 100 and 100A of the embodiment.
Manufacture of the cylinder head devices 100 and 1003A of the embodiment starts with a step of determining whether or not the cylinder head devices 100 and 100A to be manufactured are used with the variable valve timing mechanism 12 (step S20).
When it is determined that the specification has the variable valve timing mechanism 12, the cylinder head 3 having the control flow paths 21b, 26a, 26b and the oil flow path 21a is prepared (step S22), and the intake side oil supply is performed. A cam bracket 29 is prepared in which an exhaust-side oil supply passage 30 is formed opposite to the intake-side oil supply passage 31 with the passage 31, the control passages 27a and 27b, and the weir portion 32 therebetween (step S24). The cylinder head 3 and the cam bracket 29 are assembled so that the control flow paths 26a and 26b and the control flow paths 27a and 27b communicate with each other, and the oil flow path 21a and the exhaust side oil supply path 30 communicate with each other. (Step S26), the cylinder head device 100 is completed.

On the other hand, when it is determined that the cylinder head devices 100 and 100A manufactured in step S20 have specifications that do not have the variable valve timing mechanism 12, the cylinder head 3A in which the oil flow path 21a and the recess 35 are formed is prepared. (Step S28), a cam bracket 29 is prepared in which an exhaust-side oil supply path 30 is formed opposite to the intake-side oil supply path 31 with the intake-side oil supply path 31, the control flow paths 27a and 27b, and the weir portion 32 therebetween. (Step S24). Then, the cylinder head 3 and the cam bracket 29 are assembled so that the oil flow path 21a and the exhaust side oil supply path 30 communicate with each other and the oil supply path 30 and the oil supply path 31 communicate with each other through the recess 35 ( Step S26), the cylinder head device 100A is completed.
By manufacturing the cylinder head devices 100 and 100A in this manner, the cam bracket 29 can be shared between the cylinder head device 100 including the variable valve timing mechanism 12 and the cylinder head device 100A not including the variable valve timing mechanism 12. Therefore, it is possible to avoid a mounting error of the cam bracket 29 due to a specification difference.

  According to the cylinder head devices 100 and 100A of the embodiments described above, the cam bracket 29 is shared between the case where the variable valve timing mechanism 12 is provided and the case where the variable valve timing mechanism 12 is not provided. A mounting error of the cam bracket 29 can be avoided. In addition, the oil flow path 30 and the oil flow path 31 that are disconnected from each other by the dam portion 32 are formed in the cam bracket 29, and the recess 35 is not formed in the cylinder head 3 at a position facing the dam portion 32. Since only the recess 35 is formed in the cylinder head 3A, a structure for sharing the cam bracket 29 can be easily secured.

  In the cylinder head devices 100 and 100A of the embodiment, the concave portion 35 is formed by machining using a drill or the like on the cylinder head 3A. However, the present invention is not limited thereto, and the concave portion 35 is formed in advance by a mold, for example. It doesn't matter if you keep it

  In the cylinder head devices 100 and 100A of the embodiment, the variable valve timing mechanism 12 is attached to the distal end portion of the intake side camshaft 10, but the variable valve timing mechanism 12 is attached to the distal end portion of the exhaust side camshaft 8. It doesn't matter. In this case, the oil passage formed in the bearing portions 29a and 29b of the cam bracket 29 may be formed so as to be opposite to the embodiment. That is, the oil supply passage 30 formed on the bearing surface 29a ′ side of the bearing portion 29a is formed on the bearing surface 29b ′ side of the bearing portion 29b, the oil supply passage 31 formed on the bearing surface 29b ′ side of the bearing portion 29b, and the control flow. The paths 27a and 27b may be formed on the bearing surface 29a ′ side of the bearing portion 29a.

  The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.

It is a block diagram which shows the outline of a structure of the engine 1 carrying the cylinder head apparatus 100 of an Example. It is a block diagram which shows the outline of a structure of the engine 1A carrying the cylinder head apparatus 100A of an Example. It is a disassembled perspective view which shows the outline of a structure of the cylinder head apparatus 100 which is an Example. 1 is an enlarged plan view showing a part of a cylinder head device 100 according to an embodiment in an enlarged manner. FIG. It is a disassembled perspective view which shows the outline of a structure of the cylinder head apparatus 100A which is an Example. It is an enlarged plan view showing a part of a cylinder head device 100A as an embodiment in an enlarged manner. It is an external appearance top view which shows an external appearance when the cylinder head 3 is seen from upper direction. 3 is a cross-sectional view showing an outline of a configuration of an oil passage formed in a cylinder head 3. FIG. It is an external appearance top view which shows an external appearance when 3 A of cylinder heads are seen from upper direction. It is a block diagram which shows the outline of a structure of the oil path formed in 3 A of cylinder heads. 4 is an external view showing an external appearance of a cam bracket 29. FIG. It is an external view which shows an external appearance when the cam bracket 29 is seen from the arrow A side in FIG. 3 is a cross-sectional view showing an oil passage configuration when a cam bracket 29 is attached to a cylinder head 3. FIG. It is sectional drawing which shows the oil-path structure when the cam bracket 29 is attached to 3 A of cylinder heads. It is process drawing which illustrates the mode of manufacture of the cylinder head apparatuses 100 and 100A of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Engine 2 Cylinder block 3,3A Cylinder head 5 Oil pan 6 Crankshaft 7 Timing chain 8 Exhaust side camshaft 8a, 10a Journal part 8b, 10b Cam 9, 11 Cam sprocket 10 Intake side camshaft 10c Oil path 12 Variable Valve timing mechanism 14 Oil pump 15 First bearing portion 16 Second bearing portion 17 Contact portion 18a, 18b, 18c, 20 Bolt hole 19 Valve lifter boss 21a First oil passage 21b Second oil passage (control passage)
22 control valve chamber 23 control valve 26a retarded-side control flow path 26b advanced-angle-side control flow path 27a, 27b control flow path 27a ', 27b' communicating portion 29 cam bracket 29a first bearing portion 29b second Bearing part 29a ', 29b' Bearing surface 29c Bolt hole 30 1st supply path 30a Linear groove 30b Extension groove 30c Communication part 31 2nd supply path (intake side oil supply path)
31a Linear groove 32 Weir 33 Head bolt 35 Recess (Communication recess)
100, 100A Cylinder head device 300 Matching surface 302 Mounting surface

Claims (7)

A cylinder head device comprising: a first camshaft that drives a first engine valve; and a second camshaft that is arranged in parallel to the first camshaft and drives a second engine valve;
In the first case where the variable cam timing mechanism is not provided on the second camshaft, a first oil passage through which oil flows is formed, and the second camshaft is provided with the variable valve timing mechanism. In this case, a cylinder head in which a second oil passage through which the oil flows in addition to the first oil passage is formed;
A first supply path for rotatably supporting the first journal portion of the first camshaft and supplying the oil to the first journal portion in communication with the first oil passage is formed on an inner peripheral surface. A first bearing portion and a second journal portion of the second camshaft are rotatably supported and formed on an inner peripheral surface capable of supplying the oil to the second journal portion via the first supply path. A cam bracket having a second bearing portion that is capable of communicating with a second supply path and the second oil flow path and that is formed with a control flow path that guides the oil to the variable valve timing mechanism;
In the first case, the communication cut-off means communicates the first supply path and the second supply path, and in the second case, cuts off the first supply path and the second supply path. When,
A cylinder head device. The cam bracket has a weir portion that separates the first supply path and the second supply path,
In the first case, the communication blocking means includes a communication recess that communicates the first supply path and the second supply path with a contact portion provided at a position corresponding to the dam portion of the cylinder head. By forming the first supply path and the second supply path, the first supply path and the second supply path are brought into contact with the contact portion in the second case. The cylinder head device according to claim 1, wherein the cylinder head device is means for preventing communication with the two supply paths.   The cylinder head device according to claim 2, wherein the communication recess is formed in the contact portion by machining. The first camshaft is an exhaust side camshaft that drives an exhaust valve as the first engine valve,
The cylinder head device according to any one of claims 1 to 3, wherein the second camshaft is an intake side camshaft that drives an intake valve as the second engine valve. An internal combustion engine comprising the cylinder head device according to any one of claims 1 to 4 and driving the first camshaft and the second camshaft by utilizing rotation of a crankshaft. A method for manufacturing a cylinder head device comprising: a first camshaft that drives a first engine valve; and a second camshaft that is arranged in parallel with the first camshaft and drives a second engine valve,
(A) In the first case where the variable valve timing mechanism is not provided on the second camshaft, a first cylinder head having a first oil passage through which oil flows is prepared,
(B) In the second case in which the variable valve timing mechanism is provided on the second camshaft, a second cylinder head in which a second oil passage through which the oil flows is formed in addition to the first oil passage. Prepare
(C) having a first bearing portion that rotatably supports the first journal portion of the first camshaft and a second bearing portion that rotatably supports the second cam journal portion of the second camshaft; A first supply passage that communicates with the first oil passage and supplies the oil to the first journal portion is formed on the inner peripheral surface of the first bearing portion, and is formed on the inner peripheral surface of the second bearing portion. Can communicate with the second oil passage and the second supply passage for supplying the oil to the second journal portion via the first supply passage, and can guide the oil to the variable valve timing mechanism. Prepare a cam bracket with a control flow path,
(D) In the first case, the cam bracket is disposed on the first cylinder head so that the first supply path and the second supply path communicate with each other;
(E) In the second case, the cam bracket is disposed on the second cylinder head so that the first supply path and the second supply path are blocked. A method of manufacturing a cylinder head device. The step (c) is a step in which the first supply path and the second supply path are separated from each other by a dam portion.
In the step (d), the first supply path and the first supply path are formed by forming a communication recess that connects the first supply path and the second supply path at a position corresponding to the dam portion of the first cylinder head. A step of communicating with the second supply path;
In the step (e), a contact portion that comes into contact with the dam portion is provided at a position corresponding to the dam portion of the second cylinder head, and the dam portion and the contact portion are brought into contact with each other. The method for manufacturing a cylinder head device according to claim 6, wherein the step is a step of preventing communication between the first supply path and the second supply path.

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