JPH108927A - Intake and exhaust valve drive control device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify the configuration of an internal combustion engine as a whole, and to reduce the overall height of the engine. SOLUTION: A cylindrical camshaft 11 divided for each cylinder is disposed on the outer periphery of drive shafts 1 and 2 on an intake side and an exhaust side which rotate synchronously with an engine, and according to eccentric positions of annular disks 13 and 14. The camshaft 11 rotates at an irregular speed. The annular disks 13 and 14 on the intake side and the exhaust side are rotatably held by the same control housing 20. The control housing 2 is formed by the eccentric bush 26 and the eccentric cam 25.
When the control shaft 23 having the eccentric cam 25 rotates, the control housing 20 swings, and the two annular disks 13 and 14 simultaneously perform the eccentric operation. The fixed shaft 24 is disposed between the ignition plug post 32 and the intake camshaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the opening and closing of an intake valve and an exhaust valve according to the operating state of an internal combustion engine by rotating a cylindrical camshaft arranged on the outer periphery of a drive shaft at an irregular speed relative to the drive shaft. The present invention relates to an intake / exhaust valve drive control device that variably controls a timing and an operating angle, and particularly to an internal combustion engine in which a center of an annular disk provided for each cylinder is eccentric in a direction perpendicular to an axis by a control shaft having an eccentric cam. And a drive control device for the intake and exhaust valves.

[0002]

2. Description of the Related Art Various types of devices for variably controlling the opening / closing timings and operating angles of intake and exhaust valves have been conventionally provided.
As described in JP-A-306-306 and JP-A-6-185321, those applying the principle of a non-uniform velocity joint are known. This is because a cylindrical camshaft divided for each cylinder is provided on the outer periphery of a drive shaft that rotates in synchronization with the rotation of the engine, and a flange portion at the end of the camshaft and a flange portion on the drive shaft side are provided. And a pair of pins for engaging with the respective engagement grooves is provided on an annular disk interposed between both flange portions, wherein the annular disk is a control housing. While being held rotatably, the annular disk can be eccentric with respect to the camshaft via the control housing, and by controlling the amount of eccentricity, the valve lift characteristics change. I have.

Further, Japanese Patent Application Laid-Open No. 6-185321 discloses a configuration using an eccentric cam to move the control housing in a direction perpendicular to the axis. That is, the control housing is swingably supported by the support shaft, and a circular cam fitting hole is formed in the control housing. The eccentric cam formed in the control shaft is fitted in the cam fitting hole. It is fitted rotatably. The control housing is moved by controlling the rotational position of the control shaft by an actuator. In this publication, the above-described variable mechanism is applied to, for example, an intake valve side, and one annular disk is rotatably held by one control housing. Further, the support shaft and the control shaft are rotatably supported by a frame-shaped frame provided separately from the bearing portion of the camshaft.

[0004]

However, in the above-mentioned conventional apparatus, the frame-shaped frame body is superposed on the upper surface of the cylinder head, so that the structure of the upper part of the cylinder head becomes complicated and the weight is reduced. It will be very large. Further, since a frame having a relatively large dimension in the height direction surrounds the periphery of the cylinder head, there is a problem that the measurement and adjustment work of the valve clearance becomes very difficult.

Further, when a variable mechanism is provided for both the intake valve and the exhaust valve, the number of parts is further increased, and
The configuration of the cylinder head becomes very complicated. Moreover, a compact cylinder head with a small valve pinch angle
It was difficult to apply.

[0006]

Accordingly, in the present invention, the annular disk on the intake side and the annular disk on the exhaust side are housed in the same control housing, and both are eccentric at the same time.

That is, the intake / exhaust valve drive control device for an internal combustion engine according to the present invention is relatively rotatably fitted to the drive shafts on the intake side and the exhaust side which rotate in synchronization with the rotation of the engine, and the outer periphery of the drive shaft. A cylindrical camshaft that has a cam for driving intake and exhaust valves on the outer periphery thereof, and a first flange portion provided at one end of each camshaft; A second flange portion provided on the drive shaft side to face the first flange portion, an annular disk provided between the two flange portions, and an annular disk provided between the annular disk and the two flange portions. A pair of engaging grooves along the radial direction for transmitting rotational movement while allowing mutual eccentricity between them, and a pair of pins engaging with the engaging grooves, and an intake side and an exhaust positioned side by side with each other Side ring Each disk is rotatably held, the control housing having a circular cam fitting hole and a bush fitting hole formed therein, and the inner peripheral surface is rotatably fitted to the outer periphery of the fixed shaft, and the outer peripheral surface is Rotatably fitted in the bush fitting hole of the control housing,
An eccentric bush that movably supports the control housing along a direction perpendicular to the axis; and an eccentric cam rotatably fitted in a cam fitting hole of the control housing. And a control shaft that moves along the control shaft, wherein the control shaft is disposed at a position above one camshaft when the cylinder is vertical, and the other. The fixed shaft is disposed at a position near the camshaft.

In this configuration, the annular disk on the intake side and the annular disk on the exhaust side are held by the same control housing, and when the control shaft having the eccentric cam rotates, the control housing swings in the direction perpendicular to the axis. And
Each annular disk is eccentric. As a result, the camshaft rotates at an irregular speed with respect to the drive shaft, and the valve lift characteristics change. That is, there is no need to provide a control housing and its swing mechanism on each of the intake side and the exhaust side. In general, in the internal combustion engine as a whole, a plurality of the annular disks are generally provided on each of the intake side and the exhaust side, and accordingly, the number of control housings is correspondingly provided.

According to a second aspect of the present invention, in the internal combustion engine in which the cylinder is mounted in an inclined position, the control shaft is disposed on one camshaft which is relatively lower, and the other camshaft is disposed on the other camshaft. The fixed shaft is disposed between the cam maximum locus and the ignition plug post at the center of the cylinder head.

[0010] In this configuration, the fixed shaft is housed in the space between the camshaft and the ignition plug post, which are relatively upper, and the upper cam is located in the inclined mounting position of the cylinder. The amount by which the shaft projects upward from the shaft becomes smaller. That is, when the in-line multi-cylinder internal combustion engine is mounted in a slanted manner, or in a V-type internal combustion engine, the position of the fixed shaft that determines the overall height of the internal combustion engine in the mounted state is reduced,
The overall height is suppressed. In addition, since the control shaft, which requires a driving actuator, is located relatively below, the layout is facilitated.

Particularly, in the V-type internal combustion engine, the control shaft is provided on the exhaust camshaft located outside the V bank, and the control shaft is provided on the intake camshaft located inside the V bank. It is desirable to arrange the fixed shafts respectively. In this case, there is no problem of interference between the actuator of the control shaft and the intake manifold.

According to a third aspect of the present invention, the fixed shaft is fixed to a cam bracket supporting the other camshaft by a cam bracket bolt. That is, the cam bracket and the cam bracket bolt also serve as a support member for the fixed shaft.

According to the present invention, the control housing is divided into at least two parts along a plane passing through the centers of the exhaust-side and intake-side camshafts, and these parts are assembled integrally with each other. It is characterized by: Thus, the control housing can be downsized without being restricted by the cam dimensions of the camshaft, and can be applied to a cylinder head having a small valve clamping angle.

A sixth aspect of the present invention is different from the first to fifth aspects of the present invention in that a variable valve mechanism is provided in only one of the intake valve and the exhaust valve. That is, the intake-side or exhaust-side drive shaft, which rotates in synchronization with the rotation of the engine, is fitted to the outer periphery of the drive shaft so as to be relatively rotatable, and is divided for each cylinder. A cylindrical camshaft having a cam for driving a valve on the outer periphery; a first flange provided at one end of each camshaft; and a first flange provided on the drive shaft side to face the first flange. A second flange portion;
An annular disk disposed between the flange portions, and a pair of radially extending engagement members for transmitting rotational movement while allowing eccentricity between the annular disk and the flange portions; A control housing having a mating groove and a pair of pins engaged with the engaging groove, a rotatable holding of the annular disk, and a circular cam fitting hole and a bush fitting hole formed therein; Is rotatably fitted to the outer periphery of the fixed shaft, and the outer peripheral surface is rotatably fitted to the bush fitting hole of the control housing, and supports the control housing so as to be movable in a direction perpendicular to the axis. And a control shaft having an eccentric cam rotatably fitted in a cam fitting hole of the control housing, the control shaft moving the control housing along a direction perpendicular to the axis by the rotation thereof. In the intake / exhaust valve drive control device for an internal combustion engine, the control shaft is disposed at a position above the drive shaft when the cylinder is vertical, and the cam maximum trajectory of the other cam shaft and the center of the cylinder head are It is characterized in that the fixed shaft is arranged between the ignition plug post.

In this configuration, the fixed shaft is housed in a space between the camshaft whose lift characteristics do not change and the spark plug post, and the whole size is reduced. In particular, this is suitable for a case where the cylinder has an inclined mounting posture.

[0016]

According to the intake / exhaust valve drive control apparatus for an internal combustion engine according to the first to fifth aspects of the present invention, the eccentric operation of the annular disks on both the intake side and the exhaust side is performed by the common control housing. In addition, there is no need to provide a control housing and its swing mechanism on each of the intake side and the exhaust side, so that the configuration of the entire internal combustion engine can be simplified and the number of parts is reduced.

In particular, according to the second aspect of the present invention, the fixed shaft located relatively above can be arranged low when the engine is mounted. In this case, the overall height in the mounted state can be suppressed low.

According to the third aspect of the present invention, since the fixed shaft is supported by the cam bracket and the cam bracket bolt, the number of parts is further reduced.

According to the configuration of claim 4, the overall height can be reduced and the arrangement of the actuator of the control shaft becomes easy.

Further, according to the structure of the fifth aspect, the control housing can be miniaturized, the invention can be applied to a cylinder head having a small valve sandwiching angle, and the upper part of the cylinder head of the internal combustion engine can be further miniaturized.

According to the configuration of claim 6, when either the intake valve or the exhaust valve is provided with a variable valve operating mechanism, it is possible to similarly reduce the size.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an intake / exhaust valve drive control device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an upper portion of a cylinder head 31 of an internal combustion engine provided with an intake / exhaust valve drive control device according to the present invention. As shown, the cylinder head 31
At the upper part, an intake side drive shaft 1 and an exhaust side drive shaft 2 are arranged in parallel with each other. These drive shafts 1 and 2 are continuous to one over all cylinders, each have a sprocket at one end (not shown), and are linked to the crankshaft via a timing chain. With the drive shafts 1 and 2 at the center, variable valve mechanisms 3 and 4 on the intake side and the exhaust side are provided for each cylinder.

The above-described variable valve mechanisms 3 and 4 have basically the same configuration, and as shown in FIG.
A cylindrical camshaft 11 divided for each cylinder is fitted to the outer periphery of the cylinder so as to be relatively rotatable.
A first flange portion 12 is provided at one end. Each camshaft 11 has a pair of cams 11a for driving an intake valve or an exhaust valve (not shown), and is rotatably supported by a cylinder head at a journal portion intermediate the pair of cams 11a. The drive shafts 1 and 2 each have a second flange portion fixedly provided facing the first flange portion 12. An annular disk having an annular shape is interposed between the first flange portion 12 and the second flange portion. In the figure, reference numeral 13 denotes an intake-side annular disk, and reference numeral 14 denotes an exhaust-side annular disk.

Each of the first flange portions 12 is formed with an engagement groove 15 extending in the radial direction. Similarly, an engagement groove (not shown) is formed along the radial direction on the second flange portion. The engagement groove 15 of the first flange 12 and the engagement groove of the second flange portion are arranged at positions different from each other by 180 °. Retaining holes 16 and 17 are formed in the annular disks 13 and 14 at positions different from each other by 180 °.
8. The second pin 19 is rotatably fitted. These pins 18 and 19 project in opposite directions to each other, and
The tip of the pin 18 is slidably engaged with the engagement groove 15 of the first flange 12 and the tip of the second pin 19 is slidably engaged with the engagement groove (not shown) of the second flange. Engage as possible. The side surfaces of the tips of the pins 18 and 19 that are in sliding contact with the engagement grooves are machined into a pair of parallel planes.

Since the variable valve mechanisms 3 and 4 themselves have a known structure, for example, in the above-mentioned Japanese Patent Application Laid-Open No. 6-185321, the detailed description thereof is omitted, but the annular disks 13 and 14 are driven. When the camshafts 11 are concentric with respect to the centers of the shafts 1 and 2 as shown in FIG. 8, the camshafts 11 rotate at the same speed as the drive shafts 1 and 2, and a valve lift characteristic along the profile of the cam 11a is obtained. Also annular disk 1
When the eccentricity of the camshafts 3 and 14 with respect to the centers of the drive shafts 1 and 2 becomes a kind of non-constant speed shaft joint, each camshaft 11 rotates unequally with respect to the drive shafts 1 and 2. As a result, the valve lift characteristics and the valve operating angle change.

The intake side annular disk 13 and the exhaust side annular disk 14 are rotatably held by the same control housing 20. The control housing 20 has a plate shape along a plane orthogonal to the drive shafts 1 and 2, and has annular disks 13 and 14 on both sides.
Are held, and both annular portions 20a, 20b are a pair of upper and lower parallel linear portions 20a, 20b.
c, 20d. Then, on the upper portions of the annular portions 20a and 20b, ear portions 20f and 20e are respectively provided.
Are formed in an extended manner, and a circular cam fitting hole 21 is formed in one ear 20e, and a bush fitting hole 22 also formed in a circular shape is formed in the other ear 20f. . The control shaft 23 is provided in the cam fitting hole 21, and the fixed shaft 2 is provided in the bush fitting hole 22.
4 are respectively inserted.

A circular eccentric cam 25 is fixed to the control shaft 23 for each cylinder. The outer peripheral surface of the eccentric cam 25 is slidably fitted in the cam fitting hole 21. I have. The fixed shaft 24 and the bush fitting hole 22
Between them, an eccentric bush 26 is interposed. The eccentric bush 26 has a true circular outer surface and an inner surface that are eccentric to each other. The inner surface is rotatably fitted to the fixed shaft 24 and the outer surface is fitted to the bush. It is rotatably fitted in the hole 22. Therefore, when the control shaft 23 provided with the eccentric cam 25 rotates, the entire control housing 20 swings up and down in the figure, and the centers of the annular disks 13 and 14 are eccentric from the centers of the drive shafts 1 and 2 and the camshaft 11. It has become.

The control shaft 23 is located above the exhaust-side camshaft 11 and the drive shaft 2.
Disposed in parallel with the camshaft 11 and the drive shaft 2;
And it is continuous over all cylinders, and one end thereof is connected to an actuator (not shown) such as a hydraulic motor. The control shaft 23 is rotatably supported via a cam bracket (not shown).

The fixed shaft 24 is also continuous over all the cylinders, and has a spark plug post 32 at the center of the cylinder head 31 and a camshaft 1 on the intake side.
1 are arranged. Specifically, camshaft 1
One cam 11a is located between the maximum locus and the ignition plug post 32. The height position is lower than the control shaft 23 when the cylinder is vertical as shown in FIG. As shown in FIG. 2, the fixed shaft 24 is provided on an upper surface of a step portion 33a formed on a side portion of a cam bracket 33 that supports the camshaft 11 on the intake side.
It is fixed using a fixing bolt 35 different from the cam bracket bolt 34.

In FIG. 1, reference numeral 36 denotes a water jacket formed inside the cylinder head 31, reference numeral 37 denotes a rocker cover, and reference numeral 38 denotes a rocker cover gasket.

FIG. 3 shows a configuration in which the cylinder head 31 provided with the above-described variable valve mechanism is applied to a V-type internal combustion engine. This embodiment has a bank angle of, for example, 60 °, and a pair of cylinder heads 31 is fixed to the upper end of a cylinder block 41. An exhaust manifold 42 is connected to the outside of the V bank, and an intake manifold 43 is arranged inside the V bank. Reference numeral 44 denotes a fuel injection valve. In this embodiment, the intake manifold 43 includes a collector 43a above one bank, and a long intake pipe length from the collector 43a to each cylinder is secured.

In this embodiment, the number of parts can be reduced by accommodating the intake-side annular disk 13 and the exhaust-side annular disk 14 in the same control housing 20.
In addition, the variable control on both the intake side and the exhaust side can be performed by one control shaft 23, and the overall configuration including the actuator and the like is greatly simplified. Further, even in the cylinder head 31 having a small valve sandwiching angle, a variable valve mechanism can be provided on both the intake side and the exhaust side.

When applied to a V-type internal combustion engine,
As each cylinder head 31 is inclined, the height of the fixed shaft 24 located inside the V bank is reduced, and the overall height of the engine is suppressed. Note that one side of the upper surface of the rocker cover 37 is formed obliquely according to the height position of the fixed shaft 24.

Since the control shaft 23 is located outside the V-bank, there is no problem of interference between the actuator (not shown) provided at the end of the control shaft 23 and the intake manifold 43, and the layout of parts is easy.

FIG. 4 shows V in which the configuration of the intake system is different.
1 shows a configuration example of a type internal combustion engine. In this embodiment, a collector 43a is provided independently for each of the left and right banks, and each collector 43a is located above the cylinder head 31 of the opposite bank.
The length of the intake pipe to each cylinder is set short. A line 45 in the figure is a lower limit engine hood line when the internal combustion engine is mounted in an engine room of an automobile. As is clear from this figure, the engine hood line 45 can be set low by lowering the position of the fixed shaft 24.

Next, FIG. 5 and FIG.
4 shows a second embodiment in which the support structure 4 is different.
Also in this embodiment, the fixed shaft 24 is provided between the ignition plug post 32 at the center of the cylinder head 31 and the camshaft 11 on the intake side, more specifically, the cam 1 of the camshaft 11.
1a is located between the maximum locus. In this embodiment, as shown in FIG.
Are fastened together by the one cam bracket bolt 34 to the upper surface of the cam bracket 33 which supports. In addition,
An R-shaped shaft receiving surface is recessed on the upper surface of the cam bracket 33.

FIG. 7 shows the cylinder head 31 of the above embodiment.
Is applied to a V-type internal combustion engine similar to that shown in FIG.

In this embodiment, the fixed shaft 24
With the cam bracket 33 and the cam bracket bolt 3
Fixing by 4 further reduces the number of parts and simplifies the configuration.

The shape of the control housing 20 shown in FIG. 8 corresponds to the embodiment shown in FIGS.

Next, FIGS. 9 and 10 show an embodiment in which the control housing 20 is divided into two parts. That is, the control housing 20 is divided into two parts, a housing upper part 20A and a housing lower part 20B, along a plane passing through the respective centers of the camshafts 11 on the exhaust side and the intake side. Are assembled integrally with each other by the bolts 51.

Therefore, even when the lift of the cam 11a of the camshaft 11 is large, it is not necessary to increase the size of the annular portions 20a, 20b for holding the annular disks 13, 14, and the control housing 20 can be reduced in size. Therefore, even in the cylinder head 31 having a small valve sandwiching angle, a large lift amount of the cam 11a can be given.

Next, FIG. 11 shows an embodiment in which the variable valve mechanism 4 is provided only on one of the intake side and the exhaust side, for example, only on the exhaust side. The variable valve mechanism 4 is not particularly different from that described above, and the camshaft 11 rotates at an irregular speed according to the eccentric position of the annular disk 14. Here, the control housing 61 for holding the annular disk 14 is smaller than that of each of the above-mentioned embodiments, and the annular portion 61a for holding the annular disk 14 is provided.
Ear portions 61b and 61c are formed on the upper and side portions, respectively. A circular cam fitting hole 62 is formed in the upper ear 61b, and a circular bush fitting hole 63 is formed in the lateral ear 61c. As in the previous embodiment, the cam fitting hole 62
The eccentric cam 25 of the control shaft 23 and the eccentric bush 26 of the fixed shaft 24 in the bush fitting hole 63.
Are fitted respectively. In this embodiment, the ear portion 61b is divided into a main body portion of the control housing 61 and a cap portion 64 along a plane passing through the center of the cam fitting hole 62, and is connected by a pair of bolts 65. Have been.

The fixed shaft 24 is also continuous over all the cylinders, and has a spark plug post 32 at the center of the cylinder head 31 and an intake camshaft 66.
And is located between. Specifically, the camshaft 66
Is located between the cam maximum locus and the spark plug post 32. This fixed shaft 24 is the same as that shown in FIGS.
Similarly to the embodiment, the cam bracket 67 supporting the exhaust-side camshaft 66 is fixed to the upper surface of a step formed on the side of the cam bracket 67 using a fixing bolt different from the cam bracket bolt 68. .

As shown in the drawing, the cylinder head 31 having the above-described structure is used in an inclined position such that the intake valve side is higher than the exhaust valve side. In the figure, line H is a horizontal line, line V
Is a vertical line, and in this example, the cylinder head 31
Is inclined by A °. According to the above-described configuration in such an inclined posture, the fixed shaft 24 is at the same height position as the intake side camshaft 66, so that the overall height of the internal combustion engine can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cylinder head showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a support structure of a fixed shaft.

FIG. 3 is a sectional view of a V-type internal combustion engine provided with the cylinder head.

FIG. 4 is a sectional view showing a V-type internal combustion engine having a different intake system configuration.

FIG. 5 is a sectional view of a cylinder head showing a second embodiment of the present invention.

FIG. 6 is a sectional view of a main part showing a support structure of the fixed shaft in this embodiment.

FIG. 7 is a sectional view of a V-type internal combustion engine provided with the cylinder head.

FIG. 8 is a sectional view showing a main part of the variable valve mechanism.

FIG. 9 is a sectional view of a main part showing an embodiment in which the control housing is divided into two parts.

FIG. 10 is a sectional view of a cylinder head using the control housing.

FIG. 11 is a sectional view showing a cylinder head provided with a variable valve mechanism only in the intake system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake side drive shaft 2 ... Exhaust side drive shaft 11 ... Camshaft 12 ... 1st flange part 13 ... Intake side annular disk 14 ... Exhaust side annular disk 18 ... 1st pin 19 ... 2nd pin 20 ... Control housing 23 ... Control shaft 24 ... Fixed shaft 25 ... Eccentric cam 26 ... Eccentric bush 31 ... Cylinder head 32 ... Ignition plug post

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shunichi Aoyama, Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Shin Shin Nakamura 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa, Nissan Motor Co., Ltd. 72) Inventor Shinichi Takemura 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. (72) Inventor Tsuneyasu Nohara 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Prefecture Nissan Motor Co., Ltd.

Claims (6)

[Claims] An intake-side and exhaust-side drive shaft that rotates in synchronization with rotation of an engine, is rotatably fitted to an outer periphery of the drive shaft, and is divided for each cylinder. A cylindrical camshaft having a cam on the outer periphery for driving the intake / exhaust valve, a first flange provided at one end of each camshaft, and the drive shaft side opposed to the first flange, respectively. A second flange portion provided on the first and second flange portions; an annular disk disposed between the two flange portions; and a rotary motion transmitted while allowing eccentricity between the annular disk and the two flange portions. A pair of engagement grooves along the radial direction of the pair and a pair of pins engaged with the engagement grooves, and the intake-side and exhaust-side annular discs located side by side are rotatably held, respectively. Mosquito A control housing having an opening formed therein with a shaft fitting hole and a bush fitting hole, and an inner peripheral surface rotatably fitted to the outer periphery of the fixed shaft, and an outer peripheral surface rotatably fitted into the bush fitting hole of the control housing. An eccentric bush fitted and movably supporting the control housing along a direction perpendicular to the axis; and an eccentric cam rotatably fitted in a cam fitting hole of the control housing. And a control shaft for moving the control shaft along a direction perpendicular to the axis, wherein the control shaft is disposed at a position above one camshaft when the cylinder is vertical. An intake and exhaust valve drive control device for an internal combustion engine, wherein the fixed shaft is arranged at a position near the other camshaft. 2. In an internal combustion engine in which a cylinder is mounted in an inclined position, the control shaft is arranged on one camshaft which is relatively lower, and a cam maximum locus of the other camshaft and a cylinder head are arranged. 2. The intake / exhaust valve drive control device for an internal combustion engine according to claim 1, wherein the fixed shaft is arranged between the center spark plug post. 3. An intake / exhaust valve drive control apparatus for an internal combustion engine according to claim 1, wherein said fixed shaft is fixed to a cam bracket supporting said other camshaft by a cam bracket bolt. . 4. In a V-type internal combustion engine, the control shaft is arranged on an exhaust camshaft located outside the V bank, and the fixed shaft is arranged on an intake camshaft located inside the V bank. The intake / exhaust valve drive control apparatus for an internal combustion engine according to any one of claims 1 to 3, wherein: 5. The control housing is divided into at least two parts along a plane passing through respective centers of the exhaust-side and intake-side camshafts, and these parts are integrally assembled with each other. Claims 1-4
An intake / exhaust valve drive control device for an internal combustion engine according to any one of the above. 6. An intake-side or exhaust-side drive shaft that rotates in synchronization with the rotation of the engine, is rotatably fitted to the outer periphery of the drive shaft, and is divided for each cylinder. A cylindrical camshaft having a cam on the outer periphery for driving the intake / exhaust valve, a first flange provided at one end of each camshaft, and the drive shaft side opposed to the first flange, respectively. A second flange portion provided on the first and second flange portions; an annular disk disposed between the two flange portions; and a rotary motion transmitted while allowing eccentricity between the annular disk and the two flange portions. A pair of engaging grooves along the radial direction of the pair and a pair of pins engaging with the engaging grooves, and the annular disk are rotatably held, and circular cam fitting holes and bush fitting holes are opened. Formed The control housing has an inner peripheral surface rotatably fitted to the outer periphery of the fixed shaft, and an outer peripheral surface rotatably fitted to the bush fitting hole of the control housing. An eccentric bush that movably supports the control housing, an eccentric cam rotatably fitted in a cam fitting hole of the control housing, and a control shaft that moves the control housing along a direction perpendicular to the axis by the rotation thereof; An intake and exhaust valve drive control device for an internal combustion engine, comprising: a control shaft disposed at a position above the drive shaft when the cylinder is vertical; a cam maximum trajectory of the other cam shaft; and a cylinder head. An intake / exhaust valve drive control device for an internal combustion engine, wherein the fixed shaft is arranged between the ignition plug post and a central ignition plug post.