JP2011163240A - Valve timing control apparatus and internal combustion engine equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the rigidity of a chain cover while securing a simple oil passage structure. <P>SOLUTION: Valve chambers 12, 12 mounted with oil passage change-over control valves 18, 18 are integrally formed on the chain cover 4, while intermediate oil passage forming members 50, 50 are provided separately from the chain cover 4, which have oil passages for supplying hydraulic oil fed from an oil pump 16 to oil passage openings 13a, 13a of a cylinder head 3, into the valve chambers 12, 12 and for supplying hydraulic oil delivered from the valve chambers 12, 12 into operating oil chambers in phase changing mechanisms 30, 30, respectively. The intermediate oil passage forming members 50, 50 are mounted on the side of a chain chamber 4A of the chain cover 4, and mounted on the side of the cylinder head 3 together with the chain cover 4. As a result, the oil passages are easily machined, and the intermediate oil passage forming members 50 are mounted on the chain cover 4 while securing the rigidity of the chain cover 4 without the need to form an opening in the chain cover 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a valve timing control device and an internal combustion engine including the same.

Conventionally, as this type of valve timing control device, a variable valve timing control mechanism provided concentrically with the camshaft at the end of the camshaft, and a switching valve for supplying and discharging hydraulic oil to and from this variable valve timing control mechanism And a cover member that covers the variable valve timing control mechanism, supplying hydraulic oil from the oil pump to the variable valve timing control mechanism through the cover member, and changing the rotation phase of the camshaft relative to the rotation of the crankshaft. Thus, there has been proposed one that changes the opening and closing timing of the intake valve and the exhaust valve (see, for example, Patent Document 1).
In this device, a valve chamber for disposing the switching valve, a shaft portion having an oil passage for introducing the hydraulic oil from the switching valve into the hydraulic oil chamber in the variable valve timing control mechanism, the switching valve chamber and the shaft And a connecting portion that communicates and connects the oil passage of the portion with the cover member, and the cover member is cylinderd with the shaft portion inserted into the variable valve timing control mechanism so as to be concentric with the camshaft. The valve timing control device is miniaturized by attaching it to the head.

JP 2001-82115 A

  By the way, in general, in an internal combustion engine, a chain cover is attached to a cylinder head so as to cover a timing chain for driving a valve operating device. Therefore, in the valve timing control device described above, a cover member is attached to the cylinder head. Is attached via the chain cover, and a large opening for attaching the cover member to the chain cover must be formed, making it difficult to ensure the rigidity of the chain cover. In particular, when an engine mount for attaching the internal combustion engine to the vehicle body is provided on the chain cover, it is essential to ensure the rigidity of the chain cover. The cover member may be integrally formed with the chain cover, but it may be difficult to process each oil passage.

  An object of the valve timing control device of the present invention is to ensure the rigidity of a chain cover while easily securing an oil passage structure.

  The present invention adopts the following means in order to achieve at least a part of the main object described above.

The valve timing control device of the present invention is
A valve timing control device that changes a relative rotation phase of a camshaft with respect to a crankshaft by hydraulic pressure of hydraulic oil fed from an oil pump,
A phase change mechanism provided at an end of the camshaft so as to be at least partially covered by a chain cover, and having an advance chamber and a retard chamber as a hydraulic chamber;
The chain cover is integrally formed, the hydraulic oil introduction port, the advance side opening capable of supplying the hydraulic oil introduced from the introduction port to the advance chamber, and the introduction port introduced from the introduction port A retard chamber side opening capable of supplying hydraulic oil to the retard chamber, and a valve chamber,
A switching valve that is housed in the valve chamber and switches the advance side opening or the retard side opening so as to be selectively opened;
An advance side introducing passage for introducing the hydraulic oil into the advance chamber and a retard side introduction passage for introducing the hydraulic oil into the retard chamber are inserted into the phase change mechanism concentrically with the camshaft. An advanced angle side connecting oil passage that connects the advanced angle side opening and the advanced angle side introduction path, and a retard angle side that connects the retard angle side opening and the retard angle side introduction path. The gist is to include an intermediate oil passage forming member having a connection portion that forms a connection oil passage.

  In this valve timing control device of the present invention, the valve chamber to which the switching valve is attached is formed integrally with the chain cover, while the oil passage for supplying the hydraulic oil from the switching valve to the hydraulic oil chamber is separate from the chain cover. Since the intermediate oil passage forming member is provided, the oil passage can be easily processed. Further, the intermediate oil passage forming member can be formed more compactly than the conventional cover member in which the valve chamber and the respective oil passages are integrally formed, because the intermediate oil passage forming member does not have a valve chamber. Therefore, even when it is necessary to form an opening in the chain cover when attaching the intermediate oil passage forming member to the chain cover, the opening can be made relatively small compared to the conventional case. Of course, in the valve timing control device of the present invention, the intermediate oil passage forming member can be attached to the chain cover without forming an opening in the chain cover. As a result, the rigidity of the chain cover can be ensured while simply securing the oil passage structure.

  In such a valve timing control device of the present invention, the intermediate oil passage forming member may be attached to the inside of the chain cover. In this way, the intermediate oil passage forming member can be attached to the chain cover without forming an opening in the chain cover. As a result, the rigidity of the chain cover can be further improved.

  In the valve timing control device of the present invention in which the intermediate oil passage forming member is attached to the inside of the chain cover, the intermediate oil passage forming member can supply the hydraulic oil supplied from the oil pump to the introduction port. It can also have a supply part in which a supply passage was formed. If it carries out like this, the hydraulic oil from an oil pump can be supplied to an inlet using an intermediate oil path formation member.

  In the valve timing control device of the present invention in which hydraulic oil is supplied to the inlet by the intermediate oil passage forming member, the intermediate oil passage forming member can filter the contaminants in the hydraulic oil in the supply passage. A filtration member may be arranged. If it carries out like this, a filtration member can be arrange | positioned in an intermediate | middle oil path formation member.

  Further, in the valve timing control device of the present invention, the intermediate oil passage forming member includes the advance side introduction passage and the retard side introduction passage and / or the advance side connection oil passage and the retard side connection oil passage. In addition, a filter member capable of filtering the contaminants in the hydraulic oil may be disposed. If it carries out like this, a filtration member can be arrange | positioned in an intermediate | middle oil path formation member.

  Furthermore, in the valve timing control device of the present invention, the advance side connection oil passage and the retard side connection oil passage may be formed in the connection portion. This eliminates the need to form an oil passage from the valve chamber to the phase change mechanism on the chain cover side. As a result, the oil passage can be secured more easily.

  In the valve timing control device of the present invention, the advance side connection oil passage and the retard side connection oil passage are formed by covering a groove portion formed on the chain cover side with the connection portion. You can also. In this way, an oil passage can be easily secured because only an oil groove is formed on the chain cover side.

  The internal combustion engine of the present invention is the valve timing control device of the present invention according to any of the above-described aspects, that is, basically the relative rotational phase of the camshaft with respect to the crankshaft by the hydraulic pressure of the hydraulic oil fed from the oil pump. A phase change mechanism that is provided at the end of the camshaft so as to be at least partially covered by a chain cover and that has an advance chamber and a retard chamber as a hydraulic chamber therein A valve chamber having an introduction port for the hydraulic oil fed from the oil pump, and an advance side opening and a retard side opening capable of supplying the hydraulic oil to the advance chamber or the retard chamber. Switching between the formed chain cover and the valve chamber so as to selectively open the advance angle side opening or the retard angle side opening. The phase change mechanism concentrically with the camshaft, having a valve, an advance side introduction passage for introducing the hydraulic oil into the advance chamber, and a retard side introduction passage for introducing the hydraulic oil into the retard chamber A shaft portion inserted into the lead angle side, an advance angle side connection oil passage that communicates the advance angle side opening and the advance angle side introduction path, and a retard angle side opening and the retard angle side introduction path that communicate with each other. A valve timing control device comprising: an intermediate oil passage forming member having a connecting portion that forms a retard side connection oil passage; and the gist is that the oil pump is driven by rotation of a crankshaft. .

  Since the internal combustion engine of the present invention includes the valve timing control device of the present invention according to any one of the above-described aspects, the effect of the valve timing control device of the present invention, for example, the chain cover of the chain cover can be easily secured while ensuring the oil passage structure. It is possible to achieve the same effect as the effect of ensuring the rigidity.

It is a block diagram which shows the outline of a structure of the internal combustion engine 1 provided with the valve timing control apparatus 20 as one Embodiment of this invention. 3 is a cross-sectional view showing an axial cross section of the phase changing mechanism 30. FIG. 3 is a cross-sectional view showing a cross section perpendicular to the axis of the phase changing mechanism 30. FIG. 4 is a side view of the chain cover 4. FIG. It is the back view which looked at the chain cover 4 from the back side. It is an enlarged view which expands and shows the part in which the valve chambers 12 and 12 were formed among the chain covers 4. FIG. 3 is an external view showing an external appearance of an intermediate oil passage forming member 50. FIG. 3 is a side view of an intermediate oil passage forming member 50. FIG. 3 is a front view of an intermediate oil passage forming member 50. FIG. 3 is a cross-sectional view showing an oil passage structure of the valve timing control device 20. FIG. It is the front view which looked at the intermediate oil path formation member 150 from the front. It is the side view which looked at the intermediate oil path formation member 150 from the side. It is an oil passage composition sectional view showing an oil passage composition. FIG. 6 is an enlarged view showing seat surface portions 214 and 214 of the chain cover 204 in an enlarged manner. 6 is a perspective view showing the shape of a mounting surface 250A of an intermediate oil passage forming member 250. FIG. It is an oil passage composition sectional view showing an oil passage composition. It is a block diagram which shows the outline of a structure of the internal combustion engine 301 provided with the valve timing control apparatus 320 as one Embodiment of this invention. 4 is an enlarged view showing front seat surface portions 314 and 314 of the chain cover 304. FIG. 4 is an external perspective view showing an external appearance of an intermediate oil passage forming member 350. FIG. 5 is a side view of an intermediate oil passage forming member 350. FIG. 6 is a front view of an intermediate oil passage forming member 350. FIG. 3 is a cross-sectional view showing an oil passage structure of a valve timing control device 320. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

FIG. 1 is a configuration diagram showing an outline of a configuration of an internal combustion engine 1 including a valve timing control device 20 as an embodiment of the present invention.
As shown in FIG. 1, the valve timing control device 20 of the embodiment is configured to rotate the crankshaft 2 through the intake chain camshaft 8 via the timing chain 6 disposed in the chain chamber 4 </ b> A covered with the chain cover 4. And the opening and closing timings of the intake valve and the exhaust valve in the internal combustion engine 1 that opens and closes the intake valve and the exhaust valve (not shown) by rotating the intake side camshaft 8 and the exhaust side camshaft 10. It is configured as a device to be changed, at the position of the phase change mechanisms 30, 30 disposed on one end side of each of the intake side camshaft 8 and the exhaust side camshaft 10, and the engine mount portion M formed on the chain cover 4. The valve chambers 12 and 12 formed integrally, and the oil passage switching control valves 18 and 18 inserted in the valve chambers 12 and 12. , And an intermediate oil passage forming members 50 and 50 constituting the oil path of the hydraulic oil is disposed between the valve chamber 12, 12 and the phase changing mechanism 30 and 30.

FIG. 2 is a cross-sectional view showing an axial cross section of the phase change mechanism 30, and FIG. 3 is a cross-sectional view showing a cross section perpendicular to the axis of the phase change mechanism 30.
As shown in FIG. 2, the phase changing mechanism 30 has a vane rotor 32 that is concentrically and integrally fixed to the intake side camshaft 8 and the exhaust side camshaft 10 by a cam bolt BLT, and the vane rotor 32 is relatively positioned on the inner periphery. And a housing 34 that is rotatably accommodated.
The vane rotor 32 has an opening 33 whose inner periphery opposite to the side in contact with the intake side camshaft 8 or the exhaust side camshaft 10 is opened, and as shown in FIG. There are four vanes 36 projecting radially.

As shown in FIGS. 2 and 3, the housing 34 includes a disc-shaped front plate 34a, a housing main body 34b separating four working chambers by four vanes 36, and a rear plate having a sprocket S formed on the outer periphery. 34c, and the working chamber is composed of four advance chambers 38A and four retard chambers 38B. From the advance chamber 38A and the retard chamber 38B, a through passage 33A and a through passage 33B penetrating to the opening 33 of the vane rotor 32 are formed. The rotation of the crankshaft 2 is transmitted to the housing 34 by the timing chain 6 wound around the sprocket S, and is transmitted to the intake side camshaft 8 and the exhaust side camshaft 10 via the vane rotor 32.

4 is a side view of the chain cover 4, FIG. 5 is a back view of the chain cover 4 viewed from the back side, and FIG. 6 is a portion of the chain cover 4 where the valve chambers 12 and 12 are formed. It is an enlarged view which expands and shows.
As shown in FIGS. 4 to 6, the valve chambers 12, 12 are opened from the left and right direction (left and right direction in FIG. 5) with respect to the engine mount portion M at the position where the engine mount portion M of the chain cover 4 is formed. In addition, it is formed as a substantially cylindrical bottomed hole, and has three through passages 15 a, 15 b, 15 c penetrating on the back surface side of the chain cover 4. These through passages 15a, 15b, and 15c are respectively opened on two seating surface portions 14 and 14 that are processed to be the same height on the back surface side of the chain cover 4. Two bolt holes 14a and 14a are formed on the seat surface portions 14 and 14 in addition to the through passages 15a, 15b and 15c. In addition, bolt holes 14b and 14b having a seating surface that has been processed to be the same height as the seating surface portions 14 and 14 are further formed on the back surface side of the chain cover 4.

7 is an external view showing the external appearance of the intermediate oil passage forming member 50, FIG. 8 is a side view of the intermediate oil passage forming member 50, and FIG. 9 is a front view of the intermediate oil passage forming member 50. .
As shown in FIGS. 7, 8, and 9, the intermediate oil passage forming member 50 has a base portion 52 having a substantially isosceles triangle shape when viewed from the front, and a substantially right angle to the base portion 52 at the top of the base portion 52. And a projecting shaft portion 56 projecting substantially perpendicularly to the base portion 52 in the same direction as the projecting shaft portion 54 at a position near the bottom of the base portion 52.

In the base portion 52, two oil passages 52a and 52b are bored from the bottom side to the top side along the oblique side connecting the top and the bottom, and the protruding shaft portions 54 and 56 of the base portion 52 are formed. Two communication passages 53a and 53b communicating with the two oil passages 52a and 52b from the side of the mounting surface 52A formed on the surface opposite to the side from which the protrusion protrudes are formed. The oil passages 52a and 52b are plugged by a blind plug (not shown) on the bottom side, and the mounting surface 52A is formed into a flat surface by flattening. Boss portions B, B, B in which bolt holes are formed are formed on both the oblique sides and the bottom side of the base portion 52, and each bolt hole penetrates to the mounting surface 52A.

The projecting shaft portion 54 is formed with two in-shaft oil passages 54a and 54b communicating with the two oil passages 52a and 52b formed in the base portion 52 from the front end surface. Further, as shown in FIGS. 7 and 8, an annular oil passage 54A is formed at a position closer to the distal end surface side of the outer peripheral surface of the protruding shaft portion 54, and further closer to the distal end surface side than the annular groove 54A. Two seal ring grooves SG1 and SG2 are formed at the position, and one seal ring groove SG3 is further formed at a position closer to the base portion 52 side than the annular groove 54A.
As shown in FIG. 9, the annular groove 54A is formed with a cutout portion 54B having an outer peripheral surface cut out by about 1/3 in the circumferential direction, and communicates the in-shaft oil passage 54a and the annular groove 54A. ing.

As shown in FIGS. 7 and 9, the protruding shaft portion 56 is formed with an in-shaft oil passage 56 a penetrating from the tip surface to the mounting surface 52 </ b> A. The in-shaft oil passage 56a is formed in a stepped shape having an enlarged diameter portion 56a 'whose inner diameter is larger on the mounting surface 52A side than on the distal end side. The enlarged-diameter portion 56a 'accommodates an oil filter 57 that filters the contaminants in the hydraulic oil.

Here, the oil passage structure of the valve timing control device 20 will be described in detail.
FIG. 10 is a cross-sectional view showing the oil passage structure of the valve timing control device 20.
As shown in FIG. 1, the intermediate oil passage forming members 50, 50 are respectively attached to the seating surface portions 14, 14 of the chain cover 4 through the metal gaskets G, G with the mounting surfaces 52 A, 52 A of the base portions 52, 52. In contact with each other, the chain cover 4 is fixed by three bolts BLT. That is, each intermediate oil passage forming member 50, 50 is attached to the inside of the chain cover 4. Specifically, the communication passages 53a and 53a of the intermediate oil passage forming members 50 and 50 and the communication passages 53b and 53b are connected to the through passages 15a and 15a of the chain cover 4 and the through passages 15c and 15c, respectively. In the state in which the oil passages 56a and 56a (in the enlarged diameter portions 56a ′ and 56a ′) of the intermediate oil passage forming members 50 and 50 are connected to the through passages 15b and 15b of the chain cover 4, The path forming members 50 and 50 are attached to the chain cover 4. When the chain cover 4 is attached to the cylinder head 3 or the like so as to cover the chain chamber 4A, the projecting shaft portions 54, 54 of the intermediate oil passage forming members 50, 50 are connected to the phase change mechanisms 30, The vane rotors 32 and 32 of the 30 are inserted coaxially into the openings 33 and 33 and the front end surfaces of the projecting shafts 56 and 56 are connected to the cylinder head 3 via the seal members 58 and 58, respectively. The intermediate oil passage forming members 50, 50 are arranged between the chain cover 4 and the cylinder head 3 in the contact state. At this time, the oil passages 54a and 54b in the shafts of the intermediate oil passage forming members 50 and 50 are connected to the advance chamber 38A and the retard chamber 38B through the through passages 33A and 33B of the phase change mechanisms 30 and 30, respectively. Then, the front end side of the in-shaft oil passage 56 a of each intermediate oil passage forming member 50, 50 is connected to each oil passage opening 3 a, 3 a formed in the cylinder head 3. The oil passage opening 3a communicates with a block oil passage (not shown) formed in the cylinder block 5 through which the hydraulic oil fed by the oil pump 16 flows.

When the intermediate oil passage forming members 50, 50 are attached in such a manner that they are sandwiched between the chain cover 4 and the cylinder head 3, the hydraulic oil fed from the oil pump 16 is supplied to the cylinder as shown in FIG. It flows through an oil passage in the block (not shown) formed in the block, and flows from the oil passage openings 3a, 3a into the oil passages 56a, 56a in the projecting shaft portions 56, 56 of the intermediate oil passage forming members 50, 50. . The hydraulic oil that has flowed into the in-shaft oil passages 56a and 56a is introduced into the valve chambers 12 and 12 through the through passages 15b and 15b, and the through passages opened by the oil passage switching control valves 18 and 18, respectively. 15a, 15a or any of the through passages 15c, 15c through the communication passages 53a, 53a to the oil passages 52a, 52a, or through the communication passages 53c, 53c to any of the oil passages 52b, 52b. Flowing. When hydraulic fluid flows through the oil passages 52a and 52a, it flows to the in-shaft oil passages 54a and 54a, and flows into the advance chambers 38A and 38A from the annular grooves 54A and 54A through the through passages 33A and 33A. On the other hand, when the hydraulic oil flows through the oil passages 52b and 52b, it flows to the in-shaft oil passages 54b and 54b, and flows into the retarded chambers 38B and 38B through the through passages 33B and 33B. As described above, when the hydraulic oil flows into the advance chambers 38A and 38A or the retard chambers 38B and 38B, the vane rotors 32 and 32 rotate relative to the housings 34 and 34, and the opening / closing timings of the intake valves and exhaust valves are increased. Is changed.

As described above, according to the valve timing control device 20 of the embodiment described above, the valve chambers 12 and 12 to which the oil passage switching control valves 18 and 18 are attached are formed integrally with the chain cover 4, while the oil pump 16 to the cylinder head 3. The hydraulic oil fed to the oil passage openings 3a, 3a is supplied to the valve chambers 12, 12, and the hydraulic oil derived from the valve chambers 12, 12 is used as an advance chamber 38A and a retard chamber 38B. An intermediate oil passage forming member 50 separate from the chain cover 4 is provided for an oil passage (an in-shaft oil passage 56a, communication passages 53a and 53b, oil passages 52a and 52b, and in-shaft oil passages 54a and 54b). , 50, the oil passage can be easily processed. In addition, when attaching the intermediate oil passage forming member 50 to the chain cover 4, it is not necessary to form an opening in the chain cover 4, so that the rigidity of the chain cover 4 does not decrease. As a result, the rigidity of the chain cover 4 can be ensured while simply securing the oil passage structure.

In the valve timing control device 20 of the first embodiment, each intermediate oil passage forming member 50, 50 is provided with protruding shaft portions 56, 56 having in-shaft oil passages 56a, 56a, and each oil passage opening 3a, The hydraulic oil from the oil pump 16 is supplied to the valve chambers 12 and 12 by contacting the 3a via the seal rings 58 and 58, but the intermediate oil passage forming members 50 and 50 are provided with protruding shafts. Without providing the portions 56, 56, the cylinder head 3 is formed with projecting portions 3A, 3A projecting toward the chain cover 4, the oil passage openings 3a, 3a are formed in the projecting portions 3A, 3A, respectively, and a seal ring is formed. The hydraulic fluid from the oil pump 16 is made to contact the seat surface portions 14 and 14 of the chain cover 4 through the oil passage openings 3a and 3a. It may be used as to supply to each of the valve chambers 12 and 12 via the 5b.

11 is a front view of the intermediate oil passage forming member 150 as seen from the front, FIG. 12 is a side view of the intermediate oil passage forming member 150 as seen from the side, and FIG. 13 is an oil showing the oil passage configuration. It is a road composition sectional view.
As shown in FIG. 11, the intermediate oil passage forming member 150 includes an A-shaped base portion 152 having a substantially alphabetical shape when viewed from the front, and a projecting shaft that projects substantially perpendicularly to the base portion 152 at the top of the base portion 152. Part 154. The base portion 152 has two oil passages 152a and 152b extending from the tip end portion side to the top portion along the oblique side connecting the top portion and the leg portion. Two communication passages 153a and 153b communicating with the two oil passages 152a and 152b from the side of the mounting surface 152A formed on the surface opposite to the side from which the portion 154 protrudes are formed. The oil passages 152a and 152b are plugged by blind plugs (not shown) at the distal ends of the leg portions, and the mounting surface 152A is formed into a flat surface by flattening. Further, boss portions B, B, B, B in which bolt holes are formed are formed in the leg portions of the base portion 152, and these bolt holes penetrate to the mounting surface 152A. The projecting shaft portion 154 is formed with two in-shaft oil passages 154a and 154b communicating with the two oil passages 152a and 152b formed in the base portion 152 from the front end surface.
Further, as shown in FIG. 12, an annular oil passage 154A is formed at a position closer to the distal end surface side of the outer peripheral surface of the protruding shaft portion 154, and is positioned closer to the distal end surface side than the annular groove 154A. The two seal ring grooves SG1 and SG2 are further formed at a position closer to the base portion 152 side than the annular groove 154A. As shown in FIG. 11, the annular groove 154A is formed with a notch 154B whose outer peripheral surface is notched about 1/3 in the circumferential direction, and communicates the in-shaft oil passage 154a and the annular groove 154A. ing.

As shown in FIG. 13, the intermediate oil passage forming members 150 and 150 are sandwiched between the chain cover 4 and the cylinder head 3, that is, the mounting surfaces 152 </ b> A and 152 </ b> A are seating surfaces 14 of the chain cover 4. , 14 through gaskets G, G, respectively, and the protruding shaft portions 154, 154 are coaxially inserted into the openings 33, 33 formed in the vane rotors 32, 32 of the phase change mechanisms 30, 30, respectively. It is attached in the state. At this time, the tip surfaces of the projecting portions 3A, 3A formed on the cylinder head 3 are in contact with the seat surface portions 14, 14 of the chain cover 4 via the seal members 58, 58. When the intermediate oil passage forming members 150 and 150 are attached while being sandwiched between the chain cover 4 and the cylinder head 3 as described above, the communication passages 153a and 153a of the intermediate oil passage forming members 150 and 150 The through passages 15a and 15a of the chain cover 4 are connected to each other, the communication passages 153b and 153b of the intermediate oil passage forming members 150 and 150 and the through passages 15c and 15c of the chain cover 4 are connected to each other, and each protrusion The oil passage openings 3a, 3a formed in the portions 3A, 3A are connected to the through passages 15b, 15b, and the in-shaft oil passages 154a, 154a are connected to the annular grooves 154A, 154A and the through passages 33A, 33A. Are connected to the advance chambers 38A and 38A, respectively, and the in-shaft oil passages 154b and 154b are connected to the retard chambers 38B and 38B via the through passages 33B and 33B. Re is connected in communication. In each of the protrusions 3A, 3A, oil passage openings 3a, 3a and an oil passage in the block (not shown) formed in the cylinder block 5 through which hydraulic oil fed by the oil pump 16 flows are communicated. Oil passages 3b, 3b are formed, and oil filters 57, 57 are accommodated near the oil passage openings 3a, 3a of the oil passages 3b, 3b, respectively.

In this way, the hydraulic oil fed from the oil pump 16 flows through an oil passage in the block (not shown) formed in the cylinder block, and each valve chamber 12 passes from each oil passage opening 3a, 3a via each through passage 15b, 15b. , 12 and opened by the respective oil passage switching control valves 18, 18, from each of the through passages 15a, 15a or the respective through passages 15c, 15c, through the communication passages 153a, 153a, the oil passages 152a, It flows to either of the oil passages 152b and 152b through 152a or the communication passages 153c and 153c. When the hydraulic oil flows in the oil passages 152a and 152a, it flows to the in-shaft oil passages 154a and 154a, and flows into the advance chambers 38A and 38A from the annular grooves 154A and 154A through the through passages 33A and 33A. On the other hand, when the hydraulic oil flows through the oil passages 152b and 152b, it flows to the in-shaft oil passages 154b and 152b, and flows into the retarded chambers 38B and 38B through the through passages 33B and 33B.

Also in the valve timing control device of such a modification, the rigidity of the chain cover can be ensured while simply securing the oil passage structure, as in the valve timing control device 20 of the first embodiment.

In the valve timing control device 20 of the first embodiment, the communication passages 53a and 53b and the oil passages 52a and 52b, which are oil passages for guiding the hydraulic oil flowing out from the valve chamber 12 to the in-shaft oil passages 54a and 54b, are connected to the intermediate oil passages. Although formed in the forming member 50, the oil passage leading to the in-shaft oil passages 54a and 54b may be formed by the intermediate oil passage forming member and the chain cover.

14 is an enlarged view showing the seat surface portions 214, 214 of the chain cover 204, FIG. 15 is a perspective view showing the shape of the mounting surface 252A of the intermediate oil passage forming member 250, and FIG. It is an oil passage composition sectional view showing a way composition.
As shown in FIG. 14, three through passages 215 a, 215 b, and 215 c that penetrate the valve chambers 212 and 212 are formed in the seat surface portions 214 and 214 of the chain cover 4. The seat surface portions 214 and 214 are formed with an oil groove 217a and an oil groove 217c connected to the through passage 215a and the through passage 215c. The oil grooves 217 a and 217 c extend substantially linearly from the through paths 215 a and 215 c toward the upper end of the chain cover 204.

  As shown in FIG. 15, the intermediate oil passage forming member 250 is the same except that the communication passages 53a and 53b and the in-shaft oil passages 52a and 52b are not formed and the attachment surface 52A is changed to the attachment surface 252A. It has the same configuration as the intermediate oil passage forming member 50 of one embodiment. That is, a base portion 252 having a substantially isosceles triangle shape when viewed from the front, a protruding shaft portion 254 that protrudes substantially perpendicularly to the base portion 252 at the top of the base portion 252, and a base near the bottom of the base portion 252. The protruding shaft portion 256 protrudes substantially perpendicularly to the protruding portion 252 in the same direction as the protruding shaft portion 254. The base portion 252 is an attachment surface 252A in which the side opposite to the side on which the projecting shaft portions 254 and 256 are formed is formed into a flat surface by flat surface processing. The projecting shaft portion 254 is formed with two in-shaft oil passages 254a and 254b that penetrate from the tip surface to the mounting surface 252A. The projecting shaft portion 256 has an inner shaft that penetrates from the tip surface to the mounting surface 252A. An oil passage 256a is formed. The in-shaft oil passage 256a is formed in a stepped shape having an enlarged diameter portion 256a ′ whose inner diameter is larger on the mounting surface 252A side than the distal end side, and the enlarged diameter portion 256a ′ includes a narrow portion in the hydraulic oil. An oil filter 257 for filtering miscellaneous materials is accommodated.

As shown in FIG. 16, each of the intermediate oil passage forming members 250, 250 is brought into contact with the seating surface portions 214, 214 of the chain cover 4 through the metal gaskets G, G so that 3 An oil passage in which a set of oil grooves 217a and 217c formed in the seat surface portions 214 and 214 are covered with the attachment surfaces 252A and 252A via the metal gaskets G and G by being fixedly attached to the chain cover 4 with a bolt. Is formed. One end of the oil passage is connected to a set of through passages 215a and 215c, and the other end is connected to a set of in-shaft oil passages 254a and 254b. Further, the in-shaft oil passages 256 a and 256 a of the intermediate oil passage forming members 250 and 250 are connected to the through passages 215 b and 215 b of the chain cover 4. When the chain cover 4 is attached to the cylinder head 3 or the like so as to cover the chain chamber 4A, the projecting shaft portions 254, 254 of the intermediate oil passage forming members 250, 250 are connected to the vane rotors 32 of the phase change mechanisms 30, 30, respectively. The cylinder head 3 is inserted into the openings 33 and 33 formed in the shaft 32 coaxially, and the front end surfaces of the projecting shaft portions 256 and 256 of the intermediate oil passage forming members 250 and 250 are interposed via the seal members 58 and 58. The intermediate oil passage forming members 250 and 250 are disposed between the chain cover 4 and the cylinder head 3. At this time, the distal end sides of a pair of in-shaft oil passages 254a and 254b of the projecting shaft portions 254 and 254 of the intermediate oil passage forming members 250 and 250 advance through the through passages 33A and 33B of the phase change mechanisms 30 and 30, respectively. Each oil passage opening formed in the cylinder head 3 at the tip end side of each of the oil passages 256a and 256a in the shafts of the projecting shaft portions 256 and 256 of the intermediate oil passage forming members 250 and 250, respectively connected to the corner chambers 38A and 38B. 3a and 3a.

Thus, the hydraulic oil fed from the oil pump 16 flows through a block oil passage (not shown) formed in the cylinder block, and the projecting shaft portion of each intermediate oil passage forming member 250, 250 from each oil passage opening 3a, 3a. 256, 256 flows into the oil passages 256a, 256a in the shaft. The hydraulic oil that has flowed into the in-shaft oil passages 256a, 256a is introduced into the valve chambers 212, 212 via the through passages 215b, 215b, and is opened by the oil passage switching control valves 18, 18. The oil flows to either one of the oil grooves 217a, 217a or each of the oil grooves 217c, 217c via either one of the through passages 215a, 215c. When the hydraulic oil flows through the oil grooves 217a and 217a, it flows through the in-shaft oil passages 254a and 254a, and flows into the advance chambers 38A and 38A from the annular grooves 254A and 254A through the through passages 33A and 33A. On the other hand, when the hydraulic oil flows through the oil grooves 217c and 217c, it flows through the in-shaft oil passages 254b and 254b and flows into the retarded chambers 38B and 8B through the through passages 33B and 33B.

Also in the valve timing control device of such a modification, the rigidity of the chain cover can be ensured while simply securing the oil passage structure, as in the valve timing control device 20 of the first embodiment.

In the valve timing control apparatus 20 according to the first embodiment, the filters 57 and 257 are provided in the in-shaft oil passages 56a and 256a in the projecting shaft portions 56 and 256, in the enlarged diameter portions 56a ′ and 256a ′, or in the oil passage 3b in the projecting portion 3A. However, it may be accommodated in any oil path to the advance chamber 38A and the retard chamber 38B. For example, any of the communication passages 53a, 53b, 153a, 153b, the through passages 15a, 15b, 15c, 215a, 215b, 215b, the in-shaft oil passages 54a, 54b, 154a, 154b, 254a, 254b, the oil passage opening 3a, etc. Or, all of them may be accommodated.

Next, an internal combustion engine 301 having a valve timing control device 320 as a second embodiment of the present invention will be described.
The internal combustion engine 301 including the valve timing control device 320 of the second embodiment is the same except that the chain cover 4 is changed to the chain cover 304 and the intermediate oil passage forming member 50 is changed to the intermediate oil passage forming member 350. The internal combustion engine 1 having the valve timing control 20 of one embodiment has the same configuration. Therefore, in the internal combustion engine 301 provided with the valve timing control device 320 of the second embodiment, a different part from the valve timing control device 20 of the first embodiment will be described.
Note that the same configuration as that of the valve timing control device 20 of the first embodiment will be described using the configuration of the valve timing control device 20 of the first embodiment as necessary (for example, phase change mechanisms 30, 30). Will be described with reference to FIGS. 2 and 3.)

FIG. 17 is a configuration diagram showing an outline of the configuration of the internal combustion engine 301 including the valve timing control device 320 as one embodiment of the present invention.
As shown in FIG. 17, the valve timing control device 320 according to the embodiment causes the rotation of the crankshaft 2 to rotate the intake side camshaft 8 via the timing chain 6 disposed in the chain chamber 304 </ b> A covered with the chain cover 304. And the opening / closing timing of the intake valve and the exhaust valve in the internal combustion engine 301 that opens and closes the intake valve and the exhaust valve (not shown) by rotating the intake side camshaft 8 and the exhaust side camshaft 10. It is configured as a device to be changed, and is positioned at the position of the phase change mechanisms 30 and 30 disposed on one end side of each of the intake side camshaft 8 and the exhaust side camshaft 10 and the engine mount portion M formed on the chain cover 304. Integrally formed valve chambers 312 and 312 and inserted into the valve chambers 312 and 312 It includes the oil passage switching valve 18, and an intermediate oil passage forming member 350 constituting the oil path between the attached valve chamber 312, 312 to the chain cover 304 and the phase changing mechanism 33, 33.

FIG. 18 is an enlarged view showing the front seat portion 314 of the chain cover 304 in an enlarged manner.
At the position where the engine mount M of the chain cover 304 is formed, as shown in the drawing, the valve chambers 312 and 312 are substantially cylindrical with the engine mount M being opened from the left and right directions (left and right in FIG. 18). It is formed as a bottomed hole. Further, on the upper surface of the chain cover 304, an opening made up of both leg portions 314A, 314A and a connecting portion 314B faces downward (the connecting portion 314B is on the upper side). And has a seating surface portion 314, and is flattened so that the seating surface has the same height. On the distal end side which is the open side of both leg portions 314A and 314A, through passages 315a and 315c penetrating the valve chambers 312 and 312 and seal ring grooves 315d and 315d surrounding the outer peripheries of the through passages 315a and 315c, respectively. The through passages 315b and 315b penetrating from the back surface to the valve chambers 312 and 312 are respectively formed at positions corresponding to each other between the through passage 315a and the through passage 315c. Around the through passages 315b and 315b on the back surface of the chain cover 304, back seat surface portions 316 and 316 are formed. In addition, openings 317 and 317 and seal ring grooves 319 and 319 surrounding the outer periphery of the openings 317 and 317 are formed at the intersections between both the leg portions 314A and 314A and the connecting portion 314B. In addition, four bolt holes 314b, 314b, 314b, and 314b are formed in the seat surface portion 314 in addition to the through passages 315a, 315a, 315c, and 315c and the openings 317 and 317.

19 is an external perspective view showing the external appearance of the intermediate oil passage forming member 350, FIG. 20 is a side view of the intermediate oil passage forming member 350, and FIG. 21 is a front view of the intermediate oil passage forming member 350. is there.
As shown in FIGS. 19, 20, and 21, the intermediate oil passage forming member 350 has an opening formed by both leg portions 352A, 352A and a connecting portion 352B corresponding to the front seat surface portion 314 of the chain cover 304. A base portion 352 having a substantially inverted U shape when viewed from the front, and a protrusion protruding substantially perpendicular to the base portion 352 at the intersection of the legs 352A, 352A and the connecting portion 352B in the base portion 352. It is comprised from the axial part 354,354.

Both leg portions 352A and 352A of the base portion 352 are provided with oil passages 352a and 352b from the open end side to the vicinity where the protruding shaft portions 354 and 354 are formed. Two sets of communication passages 353a and 353b communicating with the two sets of oil passages 352a and 352b are formed from the mounting surface 352C formed on the surface on which the portions 354 and 354 protrude. The two sets of oil passages 352a and 352b are plugged by blind plugs (not shown) at the distal ends of both leg portions 352A and 352A, and the mounting surface 352C is formed into a flat surface by flattening. The base portion 352 is formed with four boss portions B, B, B, B formed with bolt holes.

The protruding shaft portions 354 and 354 are formed with two sets of in-shaft oil passages 354a and 354b communicating with the two sets of oil passages 352a and 352b formed in the base portion 352 from the front end surface. Further, as shown in FIG. 20, annular oil passages 354A and 354A are formed at positions closer to the distal end surface of the outer peripheral surfaces of the projecting shaft portions 354 and 354, and are further distal than the annular grooves 354A and 354A. Two seal ring grooves SG1 ′ and SG2 ′ are formed at positions closer to the surface side, and one seal ring groove SG3 ′ is further formed at positions closer to the base part 352 than the annular grooves 354A and 354A. . In the annular grooves 354A and 354A, notched portions (not shown) whose outer peripheral surfaces are notched about 1/3 in the circumferential direction are formed, and the in-shaft oil passages 354a and 354a communicate with the annular oil passages 354A and 354A. is doing.

Here, the oil passage structure of the valve timing control device 320 will be described in detail.
FIG. 22 is a cross-sectional view showing the oil passage structure of the valve timing control device 320.
As shown in FIGS. 17 and 22, the intermediate oil passage forming member 350 includes seal rings SR1, SR1 and seal rings SR2, SR2, SR2 in seal ring grooves 319, 319 and seal ring grooves 315d, 315d, 315d, 315d, respectively. , SR2 is attached to the front surface 314 of the chain cover 304 to which the mounting surface 352C of the base portion 352 is brought into contact, and is fixed to the chain cover 304 by bolts BLT. Specifically, the projecting shaft portions 354 and 354 of the intermediate oil passage forming member 350 are inserted into the openings 317 and 317, and the two sets of communication passages 353 a and 353 b of the intermediate oil passage forming member 350 pass through the chain cover 304. Connected to the paths 315a and 315c, respectively. When the chain cover 304 is attached to the cylinder head 3 or the like so as to cover the chain chamber 304A, the protruding shaft portions 354 and 354 of the intermediate oil passage forming member 350 are formed on the vane rotors 32 and 32 of the phase change mechanisms 30 and 30, respectively. In addition, the intermediate oil passage forming member 350 is inserted between the chain cover 304 and the cylinder head 3 while being inserted coaxially into the openings 33 and 33 and the back seat surface portions 316 and 316 are in contact with the cylinder head 3. Arranged between. At this time, the two sets of in-shaft oil passages 354a and 354b of the intermediate oil passage forming member 350 communicate with the advance chamber 38A and the retard chamber 38B via the through passages 33A and 33B of the phase change mechanisms 30 and 30, respectively. The through passages 315 b and 315 b are connected to oil passage openings 3 a and 3 a formed in the cylinder head 3. The oil passage openings 3a, 3a communicate with a block oil passage (not shown) formed in the cylinder block 5 through which the hydraulic oil fed by the oil pump 16 flows.

When the intermediate oil passage forming member 350 is attached in such a manner as to be sandwiched between the chain cover 4 and the cylinder head 3, the hydraulic oil fed from the oil pump 16 is put into the cylinder block as shown in FIG. It flows through the formed oil passage in the block and oil passage in the head (not shown), and flows into the through passages 315b and 315b formed in the back seat surface portions 316 and 316 of the chain cover 304 from the oil passage openings 3a and 3a. The hydraulic fluid that has flowed into the through passages 315b and 315b is introduced into the valve chambers 312 and 312 and any of the through passages 315a and 315a or the through passages 315c and 315c opened by the oil passage switching control valves 18 and 18, respectively. From these, the fluid flows through the communication passages 353a and 353a to the oil passages 352a and 352a or through the communication passages 353c and 353c to the oil passages 352b and 352b. When the hydraulic oil flows through the oil passages 352a and 352a, it flows to the in-shaft oil passages 354a and 354a, and flows into the advance chambers 38A and 38A from the annular grooves 354A and 354A through the through passages 33A and 33A. On the other hand, when the hydraulic oil flows through the oil passages 352b and 352b, it flows to the in-shaft oil passages 354b and 354b and flows into the retarded chambers 38B and 38B through the through passages 33B and 33B. As described above, when the hydraulic oil flows into the advance chambers 38A and 38A or the retard chambers 38B and 38B, the vane rotors 32 and 32 rotate relative to the housings 34 and 34, and the opening / closing timings of the intake valves and exhaust valves are increased. Is changed.

As described above, according to the valve timing control device 320 of the second embodiment described above, the valve chambers 312 and 312 to which the oil passage switching control valves 18 and 18 are attached are formed integrally with the chain cover 304, while the valve chambers 312 and 312 are formed. Oil passages (two sets of through passages 353a and 353b, two sets of oil passages 352a and 352b) for supplying hydraulic oil derived from the oil to the advance chambers 38A and 38A and the retard chambers 38B and 38B as hydraulic oil chambers. Since the two sets of in-shaft oil passages 354a and 354b) are provided in the intermediate oil passage forming member 350 separate from the chain cover 304, the oil passage can be easily processed. In addition, when attaching the intermediate oil passage forming member 350 to the chain cover 304, the openings 317 and 317 formed in the chain cover 304 can be made extremely small as compared with the conventional case. Can be suppressed. As a result, the rigidity of the chain cover 304 can be ensured while simply securing the oil passage structure.

  In the valve timing control device 20 of the first embodiment and the second embodiment, the intermediate oil passage forming members 50, 50, 150, 150, 250, 250, 350 are bolted to the chain cover 4, 104, 204, 304 side. The chain covers 4, 104, 204, and 304 are both attached to the cylinder head 3 side after being attached. On the contrary, the intermediate oil passage forming members 50, 50, 150, 150, 250, 250, and 350 are attached. First, the chain cover 4, 104, 204, 304 is attached to the cylinder head 3 side so as to cover the intermediate oil passage forming members 50, 50, 150, 150, 250, 250, 350. There is no problem as well.

  In the valve timing control device 20 of the first embodiment and the second embodiment, the phase changing mechanism 30 is provided on both one end side of the intake side camshaft 8 and one end side of the exhaust side camshaft 10. Either one end side of the intake side camshaft 8 or one end side of the exhaust side camshaft 10 may be provided. In this case, only one intermediate oil passage forming member 50, 50, 150, 150, 250, 250, 350, the oil passage opening 3a of the cylinder head 3, and the like may be provided.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

DESCRIPTION OF SYMBOLS 1,301 Internal combustion engine 2 Crankshaft 3 Cylinder head 3a Oil passage opening 3A Protrusion 4, 204, 304 Chain cover 4A, 304A Chain chamber 5 Cylinder block 6 Timing chain 8 Intake side camshaft 10 Exhaust side camshaft 12, 212, 312 Valve chamber 14, 214 Seat surface portion 14a, 14b, 314b Bolt hole 15a, 15b, 15c, 215a, 215b, 215c, 315a, 315b, 315c Through passage 16 Oil pump 18 Oil passage switching control valve 20, 320 Valve timing control device 30 phase change mechanism 32 vane rotor 33 opening 33A, 33B through passage 34 housing 34a front plate 34b housing main body 34c rear plate 36 vane 38A advance angle chamber 38B retard angle chamber 50,1 50, 250, 350 Intermediate oil passage forming member 52, 152, 252, 352 Base portion 52a, 52b, 152a, 152b, 352a, 352b Oil passage 52A, 152A, 252A, 352C Mounting surface 53a, 53b, 153a, 153b, 353a , 353b Communication passage 54, 56, 154, 254, 256, 354 Protruding shaft portion 54a, 54b, 56a, 154a, 154b, 254a, 254b, 256a, 354a, 354b In-shaft oil passage 54A, 154A, 354A Annular oil passage 54B , 154B Notched portion 56a ', 256a' Expanded diameter portion 57, 257 Oil filter 58 Seal member 217a, 217c Oil groove 314 Front seat surface portion 314A, 352A Both leg portions 314B, 352B Connecting portion 315d, 319 Seal ring groove 316 Back seat Face part 317 Open M engine mount unit BLT bolt S sprocket B boss SG1, SG2, SG3, SG1 ', SG2', SG3 'seal ring groove G gasket SR1, SR2 seal ring

Claims (8)

A valve timing control device that changes a relative rotation phase of a camshaft with respect to a crankshaft by hydraulic pressure of hydraulic oil fed from an oil pump,
A phase change mechanism provided at an end of the camshaft so as to be at least partially covered by a chain cover, and having an advance chamber and a retard chamber as a hydraulic chamber;
The chain cover is integrally formed, the hydraulic oil introduction port, the advance side opening capable of supplying the hydraulic oil introduced from the introduction port to the advance chamber, and the introduction port introduced from the introduction port A retard chamber side opening capable of supplying hydraulic oil to the retard chamber, and a valve chamber,
A switching valve that is housed in the valve chamber and switches the advance side opening or the retard side opening so as to be selectively opened;
An advance side introducing passage for introducing the hydraulic oil into the advance chamber and a retard side introduction passage for introducing the hydraulic oil into the retard chamber are inserted into the phase change mechanism concentrically with the camshaft. An advanced angle side connecting oil passage that connects the advanced angle side opening and the advanced angle side introduction path, and a retard angle side that connects the retard angle side opening and the retard angle side introduction path. An intermediate oil passage forming member having a connection portion that forms a connection oil passage;
A valve timing control device comprising:   The valve timing control device according to claim 1, wherein the intermediate oil passage forming member is attached to the inside of the chain cover.   The valve timing control device according to claim 2, wherein the intermediate oil passage forming member has a supply portion in which a supply passage capable of supplying the hydraulic oil supplied from the oil pump to the introduction port is formed.   4. The valve timing control device according to claim 2, wherein the intermediate oil passage forming member is provided with a filtration member capable of filtering impurities in the hydraulic oil in the supply passage. 5.   The intermediate oil passage forming member is configured to remove the contaminants in the hydraulic oil in the advance side introduction passage and the retard side introduction passage and / or the advance side connection oil passage and the retard side connection oil passage. The valve timing control device according to any one of claims 1 to 4, wherein a filtration member capable of filtration is disposed.   The valve timing control device according to any one of claims 1 to 5, wherein the advance side connection oil passage and the retard side connection oil passage are formed in the connection portion.   6. The valve timing control device according to claim 1, wherein the advance side connection oil passage and the retard side connection oil passage are formed by covering a groove portion formed on the chain cover side with the connection portion. .   An internal combustion engine comprising the variable valve timing control device according to any one of claims 1 to 7, wherein the oil pump is driven by rotation of a crankshaft.

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