JPH1162520A - Intake/exhaust valve driving control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate at a low fuel cost and high output by changing a valve operating angle and a lift amount and adjusting the acceleration of a valve lift. SOLUTION: When a driving shaft 1 rotates, a drive disk 14 rotates through a driving gear 6 and a driven gear 14b, and a cam driver 17 rotates as a groove 14d in a radius direction on this drive disk 14 is slidably engaged with a first pin 17b of the cam driver 17. A revolving body 19 rotates around a rotating center of the cam driver 17 according to the rotation of this cam driver 17. Then, an oscillation cam 20 oscillates, as a second pin 19b of the revolving body 19 is slidably engaged with an elongated hole 20b of the oscillation cam 20. At this time, the rotation of a control shaft 9 makes a control housing 5 rotate around the driving shaft 1 to generate a deviation between rotating centers of the cam driver 17 and the drive disk 14, and the generated deviation varies the operating angle and the maximum lift amount of the valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake / exhaust valve drive control device for an internal combustion engine, which variably controls the opening / closing timing and operating angle of intake / exhaust valves according to the operating state of the internal combustion engine.

[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 rotatably provided on the outer periphery of a drive shaft that rotates in synchronization with the rotation of the engine, and a flange portion at an end of the camshaft and a drive shaft side. And a pair of pins for engaging with each of the engagement grooves is provided on an annular disk interposed between the two flange portions while forming an engagement groove along the radial direction with each of the flange portions. The disk is held rotatably by the control housing, and the annular disk can be eccentric with respect to the camshaft via the control housing. By controlling the amount of eccentricity, the operating angle changes. In addition, the valve lift characteristics change.

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. An eccentric cam formed in the control shaft is fitted in the cam fitting hole. It is fitted rotatably. Then, by controlling the rotational position of the control shaft by an actuator, the control housing is moved in a direction perpendicular to the axis to control the amount of eccentricity.

[0004]

However, such an intake / exhaust valve drive control device of the type described above changes the phase of the drive shaft and the camshaft during operation of the internal combustion engine to continuously change the operating angle. However, the valve lift is not changed.

[0005] Accordingly, when it is necessary to greatly change the operating angle in order to further achieve both low fuel consumption and high output,
The smaller the operating angle is, the larger the valve lift acceleration becomes, which causes a problem that abnormal noise and vibration increase.

Accordingly, the present invention provides an intake / exhaust system for an internal combustion engine that enables low fuel consumption and high output operation by changing not only the valve operating angle but also the valve lift amount to adjust the valve lift acceleration. An object is to provide a valve drive control device.

[0007]

According to a first aspect of the present invention, there is provided a drive shaft rotatably supported by a cylinder head and connected to a crankshaft via rotation transmitting means, and rotating in synchronization with rotation of the engine. A control housing rotatably fitted to the drive shaft; a control shaft engaged with the control housing to swing the control housing around the drive shaft; and a control shaft facing the control housing. And a support housing fixed to the cylinder head and a cam that is swingably disposed above the valve lifter on a side opposite to the side of the control housing facing the support housing and slidably contacts the valve lifter. A swing cam having a surface. A drive disk having a driven gear meshing with a drive gear of the drive shaft is rotatably supported by the support housing. A cam driver is rotatably supported on the control housing coaxially with the drive disk. A first pin protruding toward one of the drive disk and the cam driver is disposed at a position eccentric from one of the rotation shafts of the drive disk and the cam driver. One of the drive disk and the cam driver has the first
A first pin engaging portion which is slidably engaged with the pin is formed. A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation shaft of the cam driver. The swing cam is formed with a second pin engaging portion slidably engaged with a second pin of the revolving body. Here, the rotation transmitting means includes a sprocket and a timing chain or a pulley and a belt.

According to the present invention having such a configuration, when the drive shaft rotates, the drive disk provided with the driven gear that meshes with the drive gear of the drive shaft rotates. The first pin engaging portion of the drive disk is the first pin engaging portion of the cam driver.
The drive disk rotates the cam driver because it is slidably engaged with the pin. With this rotation of the cam driver, the revolving body rotates around the rotation center of the cam driver. Since the second pin of the revolving body is slidably engaged with the second pin engaging portion of the swing cam, the cam driver swings the swing cam via the revolving body. Here, when the control shaft is turned, the control housing is turned around the drive shaft. Since the cam driver is rotatably housed in the control housing, the rotation center of the cam driver is shifted from the rotation center of the drive disk. The operating angle and the maximum lift amount of the valve change by an amount corresponding to the shift. In addition, when the above-described displacement occurs, the first pin of the cam driver causes the first pin of the drive disk to transmit power from the drive disk to the cam driver.
Slides with respect to the pin engagement portion of. Therefore, the rotation of the cam driver changes periodically during one rotation of the drive disk.

Here, if the swing cam is rotatably supported by the drive shaft as described in claim 5, the swing cam is supported by the drive shaft having high rigidity, and operates smoothly and reliably.

A second aspect of the present invention provides a drive shaft rotatably supported by a cylinder head and connected to a crankshaft via rotation transmitting means, and rotating in synchronization with rotation of the engine. A support shaft arranged parallel to the shaft and rotatably supported by the cylinder head; a control housing rotatably fitted to the support shaft; and a control housing engaged with the control housing. A control shaft that swings around the support shaft, a support housing that is arranged in parallel to face the control housing and is fixed to the cylinder head, and a side opposite to the side of the control housing that faces the support housing; And a swing cam having a cam surface slidably disposed on the side of the valve lifter and in contact with the valve lifter. A drive disk having a driven gear meshing with a drive gear of the drive shaft is rotatably supported by the support housing. In the control housing,
A cam driver is rotatably supported coaxially with the drive disk. A first pin protruding toward one of the drive disk and the cam driver is disposed at a position eccentric from one of the rotation shafts of the drive disk and the cam driver. A first pin engaging portion that slidably engages with the first pin is formed on one of the other of the drive disk and the cam driver. A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation shaft of the cam driver. The swing cam is formed with a second pin engaging portion slidably engaged with a second pin of the revolving body.

According to the present invention having such a configuration, when the drive shaft rotates, the drive disk provided with the driven gear that meshes with the drive gear of the drive shaft rotates. The first pin engaging portion of the drive disk is the first pin engaging portion of the cam driver.
The drive disk rotates the cam driver because it is slidably engaged with the pin. With this rotation of the cam driver, the revolving body rotates around the rotation center of the cam driver. Since the second pin of the revolving body is slidably engaged with the second pin engaging portion of the swing cam, the cam driver swings the swing cam via the revolving body. Here, when the control shaft is turned, the control housing is turned around the support shaft. Since the cam driver is rotatably housed in the control housing, the rotation center of the cam driver is shifted from the rotation center of the drive disk. The operating angle and the maximum lift amount of the valve change by an amount corresponding to the shift. In addition, when the above-described displacement occurs, the first pin of the cam driver causes the first pin of the drive disk to transmit power from the drive disk to the cam driver.
Slides with respect to the pin engagement portion of. Therefore, the rotation of the cam driver changes periodically during one rotation of the drive disk.

Here, if the drive shaft is arranged at a position distant from the control housing as in the third aspect of the present invention, the number of components sliding on the drive shaft is reduced, and the sliding acting on the drive shaft is reduced. Resistance is reduced.

The drive shaft extends through the control housing, and a gap is formed between the drive shaft and the control housing to allow the control housing to swing. In such a case, the number of components sliding on the drive shaft is reduced, and the sliding resistance acting on the drive shaft is reduced.

Further, when the swing cam is rotatably fitted to the support shaft as in the invention of claim 6, the degree of freedom in setting a valve lift curve increases.

According to a seventh aspect of the present invention, there is provided a drive shaft rotatably supported by a cylinder head and connected to a crankshaft through rotation transmitting means, and rotating in synchronization with rotation of the engine, and a drive shaft for the drive shaft. A first support shaft arranged parallel to the shaft and rotatably supported by the cylinder head; and a second support shaft arranged parallel to the first support shaft and rotatably supported by the cylinder head. , A control housing rotatably fitted to the first support shaft, and a control housing engaged with the control housing.
A control shaft that swings around the support shaft, a support housing that is disposed in parallel to face the control housing, and is fixed to the cylinder head, and a side of the control housing that faces the support housing. Side and above the valve lifter, and the second
And a swing cam having a cam surface slidably supported by the support shaft and slidingly contacting the valve lifter. And
A drive disk having a driven gear meshing with a drive gear of the drive shaft is rotatably supported by the support housing. A cam driver is rotatably supported on the control housing coaxially with the drive disk. A first pin protruding toward one of the drive disk and the cam driver is disposed at a position eccentric from one of the rotation shafts of the drive disk and the cam driver. A first pin engaging portion that slidably engages with the first pin is formed on one of the other of the drive disk and the cam driver. A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation shaft of the cam driver. The swing cam is formed with a second pin engaging portion slidably engaged with a second pin of the revolving body. The drive shaft is arranged at a position separated from the control housing.

According to the present invention having such a configuration, when the drive shaft rotates, the drive disk provided with the driven gear that meshes with the drive gear of the drive shaft rotates. The first pin engaging portion of the drive disk is the first pin engaging portion of the cam driver.
The drive disk rotates the cam driver because it is slidably engaged with the pin. With this rotation of the cam driver, the revolving body rotates around the rotation center of the cam driver. Since the second pin of the revolving body is slidably engaged with the second pin engaging portion of the swing cam, the cam driver connects the swing cam to the second support shaft via the revolving body. Rock around. Here, when the control shaft is rotated, the control housing is rotated about the first support shaft. Since the cam driver is rotatably housed in the control housing, the rotation center of the cam driver is shifted from the rotation center of the drive disk. The operating angle and the maximum lift amount of the valve change by an amount corresponding to the shift. In addition, when the displacement occurs, the first pin of the cam driver slides with respect to the first pin engaging portion of the drive disk when power is transmitted from the drive disk to the cam driver. Therefore, the rotation of the cam driver changes periodically during one rotation of the drive disk.

The invention according to claim 8 is characterized in that the gear ratio of the driving gear and the driven gear is one to two. According to this configuration, the drive disk rotates at half the number of rotations of the drive shaft.

[0018]

According to the present invention, the operating angle and the maximum valve lift can be continuously changed by adjusting the rotation angle of the eccentric cam of the control shaft, so that the valve lift acceleration is not increased. , The operating angle can be reduced. Therefore, according to the present invention, the internal combustion engine can be operated in a wide operating angle range without increasing vibration and abnormal noise, and both high output and low fuel consumption can be achieved.

Further, according to the present invention, even if the operating angle is largely changed, the valve lift amount can be adjusted according to the change in the operating angle to reduce the valve lift acceleration.
It is possible to reduce abnormal noise and vibration caused by an increase in valve lift acceleration, and to provide a quiet intake and exhaust valve drive control device.

Further, according to the present invention, by supporting the control housing and the oscillating cam on the support shaft (the first support shaft or the second support shaft), the number of components slidingly contacting the drive shaft is reduced.
Since the sliding resistance acting on the drive shaft can be reduced, fuel efficiency can be further reduced.

Further, according to the present invention, since the control housing is supported by the support shaft, the degree of freedom in setting the valve lift curve is increased. Optimum valve characteristics can be obtained.

[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.

[First Embodiment] FIG. 1 is a perspective view showing an embodiment of an intake / exhaust valve drive control device K according to the present invention. FIG. 2 is a front view of the intake / exhaust valve drive control device K, which is partially omitted.

As shown in FIGS. 1 and 2, a drive shaft 1 which is continuous over all cylinders is disposed above a cylinder head (not shown). The drive shaft 1 is rotatably supported by a cylinder head, has a hollow shape in which a lubricating oil passage (not shown) is formed, has a sprocket 2 attached to one end, and has a timing chain. 3, and is linked to a crankshaft (not shown). A rotation phase changing means 4 is interposed between the sprocket 2 and the drive shaft 1 so as to change the rotation ratio between the crankshaft and the drive shaft 1 according to the engine operating state. The timing chain 3 and the sprocket 2 constitute a rotation transmitting means, and the rotation ratio between the crankshaft and the sprocket 2 is １ ／.

A plate-shaped control housing 5 is fitted to the drive shaft 1 so as to be relatively rotatable, and a drive gear 6 is fixed so as to be adjacent to the rear side of the control housing 5 (FIG. 2). (B)).

In the upper part of the control housing 5, FIG.
(A) An engagement groove 7 that opens upward in the middle is cut out in a substantially rectangular shape. A control shaft 9 is provided in parallel with the drive shaft 1 so as to pass through the engagement groove 7. Specifically, the eccentric cam 10 of the control shaft 9 is 2
It is engaged with the engagement groove 7 of the control housing 5 through the split blocks 11 and 11.

The control shaft 5 is rotatably supported by a cylinder head via a bearing (not shown). The control shaft 5 is parallel to the drive shaft 1 and continuous across all cylinders. Is connected to an actuator (not shown), and a position sensor (not shown) for detecting the rotational position of the control shaft 9 is provided at the other end. Then, the control housing 5 swings around the drive shaft 1 according to the amount of rotation of the control shaft 9. That is, when the eccentric cam 10 of the control shaft 9 rotates clockwise, the control housing 5 also rotates clockwise.

The back side of the control housing 5 (FIG. 2)
A support housing 12 is disposed in parallel with (b) the middle upper side) so as to face the control housing 5.
The support housing 12 is fitted to the drive shaft 1 and the control shaft 9 and is fixed to the cylinder head by the drive shaft 1 and the control shaft 9 rotatably supported by the cylinder head. This support housing 1
2 is a circular hole 1 on the right side of the drive shaft 1 as shown in FIG.
The drive disk 14 is rotatably accommodated in the hole 13.

As shown in detail in FIG. 3, the drive disk 14 includes a shaft portion 14a rotatably housed in a hole 13 of the support housing 12, and a drive gear 6 of the drive shaft 1.
And a driven gear 14b which meshes with the control housing 5 (a lower surface in FIG. 3 (b)).
A radial groove extending radially outward from a substantially central portion (first groove).
14d is formed.

As shown in FIG. 2, the control housing 5 has a circular hole 16 formed coaxially with the drive disk 14 and having the same diameter as the pitch circle of the driven gear 14b. A cam driver 17 is rotatably accommodated.

As shown in detail in FIG. 4, the cam driver 17 has a disk portion 17a rotatably housed in a hole 16 of the control housing 5, and a drive disk 14 side (see FIG. 4) from the disk portion 17a. 4 (b) (upper side). The first pin 17b of the cam driver 17 is slidably engaged with the radial groove 14d of the drive disk 14. The first pin 17b of the cam driver 17
Is rotated eccentrically about the center axis (rotation axis) of the cam driver 17. Also, the cam driver 17
Is a circular hole 17 at a position eccentric from the center axis by a predetermined amount.
c is formed, and the revolving body 19 is inserted into the circular hole 17c.
Are rotatably accommodated. As shown in detail in FIG. 5, the revolving body 19 includes a cylindrical shaft portion 19a rotatably housed in a hole 17c of the cam driver 17, and a shaft portion 1a.
And a second pin 19b projecting downward from FIG. 5a in FIG. In addition, revolving body 1
The second pin 19b includes a two-sided width portion 19c and a semicircular end portion 19d, and has a length similar to the diameter of the shaft portion 19a. Then, such revolving body 19 rotates eccentrically around the rotation axis of the cam driver 17.

A swing cam 20 is rotatably attached to the drive shaft 1. The swing cam 20 has a mounting hole 20a formed on the left end side in FIG. 6 fitted into the drive shaft 1 (see FIG. 1), and is provided on the front side (side surface side) of the control housing 5 and the valve lifter 21. (See FIG. 2B). As shown in detail in FIG. 6, the swing cam 20 has the revolving body 19 described above.
An elongated hole (second pin engaging portion) 19 for slidably receiving the second pin 19b is formed. Therefore, the swing cam 20 swings by a predetermined angle with the rotation of the revolving body 19. As shown in detail in FIG. 6, the swing cam 20 is provided with a cam surface 20c that is in sliding contact with the valve lifter 21. The contour of the cam surface 20c is formed in such a shape that desired valve characteristics can be obtained.

According to the present embodiment thus configured, when the drive shaft 1 rotates in conjunction with the crankshaft, the driven gear 6 fixed to the drive shaft 1 causes the driven gear 14b (drive disk 9). Is rotated. When the drive disk 14 rotates, the drive disk 14
The first pin 1 of the cam driver 17 is
7b is slidably engaged, so that the cam driver 17 also rotates. Then, the revolving body 19 rotatably accommodated in the cam driver 17 rotates eccentrically around the rotation center of the cam driver 17. Since the second pin 19 b of the revolving body 19 is slidably engaged with the elongated hole 20 b of the swing cam 20, the swing cam 20 is driven by the drive shaft with the rotation of the cam driver 17. Swing about 1 as a center of rotation. At this time, the revolving body 19 is
As described above, since the shaft portion 19a is rotatably housed in the hole 17c of the cam driver 17, the longitudinal direction of the two-plane width portion 19c of the second pin 19b is aligned with the long hole 20b of the swing cam 20. In the longitudinal direction. Therefore, the second pin 19b of the revolving body 19 slides smoothly in the elongated hole 20b of the swing cam 20.

Here, when the eccentric cam 10 of the control shaft 9 is rotated clockwise, the control housing 5 is rotated clockwise about the drive shaft 1 as the center of rotation. On the other hand, the support housing 12 is fixed to the cylinder head. Therefore, a deviation occurs between the axis of rotation of the drive disk 14 (center axis) and the axis of rotation of the cam driver 17 (center axis). At this time, the first pin 17b of the cam driver 17
Are displaced by sliding in the radial groove 14d of the drive disk 14, and the cam driver 17 and the drive disk 1 are displaced.
4 to absorb the displacement of the axis center position. Then, the rotation center position of the cam driver 17 moves downward by a predetermined amount, and the cam driver 17 rotates around the rotation center of the drive disk 14 with a predetermined amount of eccentricity. as a result,
As the operating angle increases, the maximum lift of the valve 22 increases. Note that the operating angle changes when the control housing 5 is in the position shown in FIG. 2 as an initial position.
Since the valve opening timing and the valve closing timing are determined on the rotation trajectory of the revolving body 19 of the cam driver 17 at this initial position, the rotation center of the cam driver 17 is shown in FIG.
When the rotation path of the revolving body 19 is deviated downward from the initial position accordingly, the valve opening timing and the valve closing time on the rotation path of the revolving element 19 are shifted by the deviated amount. Because. The reason why the maximum lift amount of the valve 22 becomes large is that the swing start position of the swing cam 20 moves downward by the amount by which the rotation center of the cam driver 17 moves downward in FIG. is there.

On the other hand, when the eccentric cam 10 of the control shaft 9 is turned to the left and the control housing 5 is turned to the left, the center of rotation of the cam driver 17 moves upward in FIG. 17 rotates around the rotation center of the drive disk 14 with a predetermined amount of eccentricity. As a result, the rotation trajectory of the revolving body 19 of the cam driver 17 shifts upward, and the valve opening timing and the valve closing timing on the rotation trajectory of the revolving body 19 shift from the initial position by an amount corresponding to the shift. The operating angle becomes smaller. Also, cam driver 1
The swing start position of the swing cam 20 shifts upward by an amount corresponding to the upward movement of the rotation center of 7, and the maximum lift of the valve 22 decreases.

As described above, by adjusting the rotation angle of the eccentric cam 25 of the control shaft 23, the operating angle and the maximum lift of the valve 22 can be continuously changed.

As described above, when the eccentric cam 10 of the control shaft 9 is rotated, a deviation occurs between the rotation center of the cam driver 17 and the rotation center of the drive disk 14, and the first rotation of the cam driver 17 is caused. The pin 17 b is configured to transmit the rotational force of the drive disk 14 to the cam driver 17 while sliding in the radial groove 14 d of the drive disk 14. Therefore, the rotation speed of the cam driver 17 changes periodically during one rotation of the drive disk 14, and the valve opening / closing timing also changes in accordance with the amount of rotation of the control shaft 9, so that the valve lift curve shown in FIG. You can get the figure. In addition, FIG.
FIG. 4 is a valve lift curve diagram of a conventional intake and exhaust valve drive control device. As shown in FIG. 8, in the conventional example, only the operating angle is changed, so that it is difficult to adjust the intake / exhaust amount more efficiently than in the present embodiment, It was difficult to adjust the acceleration effectively.

As described above, in the present embodiment, by adjusting the rotation angle of the eccentric cam 10 of the control shaft 9,
Since the operating angle and the maximum valve lift can be continuously changed, the operating angle can be reduced without increasing the valve lift acceleration, so that a wide operating angle can be achieved without increasing vibration and abnormal noise. The internal combustion engine can be operated within this range, and both high output and low fuel consumption can be achieved. Further, according to the present embodiment, even if the operating angle is largely changed, the valve lift acceleration can be reduced by adjusting the valve lift amount according to the change in the operating angle. It is possible to provide a quiet intake and exhaust valve drive control device K, which can reduce abnormal noises and vibrations caused by the increase in the pressure. Further, in this embodiment, since the rotation phase changing means 4 is arranged between the sprocket 2 and the drive shaft 1, it is needless to say that the operating angle and the maximum lift can be continuously changed. Since the valve opening / closing timing can be adjusted independently of the change in the operating angle and the maximum lift amount, the intake and exhaust amount can be adjusted efficiently, and the optimal valve is used when the internal combustion engine is running at low speed and high speed. Properties can be obtained.

[Second Embodiment] FIG. 9 is a diagram showing an intake / exhaust valve drive control device K according to a second embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 9A, the drive shaft 1
Is disposed at a position away from the control housing 5 and on the upper right side of the drive disk 14, and is rotatably supported by the cylinder head. And this drive shaft 1
Drive gear 6 is driven gear 14b of drive disk 14.
Are engaged.

In this embodiment, a support shaft 25 is provided instead of the drive shaft 1 of the first embodiment, and the control housing 5 and the swing cam 20 can swing by the support shaft 25. It is supported by. In addition, the support housing 12 is fixed to the cylinder head via the support shaft 25 and the control shaft 9.

In this embodiment, as in the first embodiment, the operating angle and the maximum lift amount of the valve 22 can be continuously changed, and the valve lift acceleration is adjusted to achieve quiet operation. Thus, it is possible to provide a low-vibration intake / exhaust valve drive control device K. In this embodiment, the drive shaft 1
Since the number of components fitted to the drive shaft 1 is reduced and the sliding resistance acting on the drive shaft 1 is reduced, it is possible to further reduce fuel consumption.

[Third Embodiment] FIG. 10 shows an intake / exhaust valve drive control apparatus K according to a third embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 10, a support shaft 26 for supporting the control housing 5 and the support housing 12 is disposed on the left side of the drive shaft 1 in the drawing. When the control shaft 9 rotates, the control housing 5 swings about the support shaft 26 as a rotation center. A hole (not shown) is formed in the control housing 5 so that a sufficient gap is formed between the control housing 5 and the drive shaft 1.
Are formed so that the control housing 5 can swing about the support shaft 26 as a center of rotation. The swing cam 20 swings around the drive shaft 1 as a center of rotation.

In this embodiment as well, like the first embodiment, the operating angle and the maximum lift amount of the valve can be continuously changed, and the valve lift acceleration is adjusted to achieve quiet operation. The intake / exhaust valve drive control device K with low vibration can be provided.

In this embodiment, as described above, since the rotation center of the swing cam 20 and the rotation center of the control housing 5 are arranged at different positions, the degree of freedom in setting the valve lift curve is reduced. As a result, the operating angle and the maximum lift amount of the valve can be more finely adjusted, and an optimal valve lift curve according to the operating condition can be obtained.

[Application Example] In the second embodiment, the first support shaft (not shown) is arranged on the left side of the support shaft (second support shaft) 25 in FIG. The control housing 5 and the support housing 12 may be supported by the support shaft, and the swing cam 20 may be supported by the support shaft 25 so as to be swingable.

According to such an application example, the same operation and effect as those of the second and third embodiments can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an intake / exhaust valve drive control device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the intake and exhaust valve drive control device. FIG. 2 (a)
Is a front view, and FIG. 2B is a plan view.

FIG. 3 is a diagram showing a drive disk. 3A is a front view, and FIG. 3B is a side sectional view.

FIG. 4 is a diagram showing a cam driver. FIG. 4A is a front view,
FIG. 4B is a side view.

FIG. 5 is a view showing a revolving body. FIG. 5A is a front view, and FIG.
(B) is a side view.

FIG. 6 is a view showing a swing cam. FIG. 6A is a front view, and FIG.
(B) is a side view.

FIG. 7 is a valve lift curve diagram according to the first embodiment of the present invention.

FIG. 8 is a conventional valve lift curve diagram.

FIG. 9 is a diagram showing an intake / exhaust valve drive control device according to a second embodiment of the present invention. 9A is a front view, and FIG. 9B is a plan view.

FIG. 10 is a diagram showing an intake / exhaust valve drive control device according to a third embodiment of the present invention. FIG. 10A is a front view, and FIG.
(B) is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drive shaft 2 ... Sprocket (rotation transmission means) 3 ... Timing chain (rotation transmission means) 5 ... Control housing 6 ... Drive gear 9 ... Control shaft 12 ... Support housing 14 ... Drive disk 14b ... Drive gear 14c ... Radial groove (First pin engaging portion) 17: Cam driver 17b: First pin 19: Revolving body 19b: Second pin 20: Swing cam 20b: Slot (second pin engaging portion) 20c: Cam Surface 21: Valve lifter 25, 26: Support shaft

Claims (8)

[Claims] A drive shaft rotatably supported by a cylinder head and connected to a crankshaft via rotation transmitting means, and rotatably fitted to the drive shaft; A combined control housing, a control shaft engaged with the control housing and swinging the control housing around the drive shaft, and disposed in parallel to face the control housing;
A swinging cam having a support housing fixed to the cylinder head, and a cam surface slidably disposed on the upper side of the valve lifter on the side opposite to the side of the control housing facing the support housing and slidably contacting the valve lifter; A drive disk having a driven gear that meshes with a drive gear of the drive shaft is rotatably supported by the support housing, and a cam driver is rotated coaxially with the drive disk by the control housing. A first pin that is movably supported and protrudes toward one of the drive disk and the cam driver at a position eccentric from one of the rotation shafts of the drive disk and the cam driver. The other one of the drive disk and the cam driver slides into the first pin. First to engage
A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation axis of the cam driver. An intake / exhaust valve drive control device for an internal combustion engine, wherein a second pin engaging portion slidably engaged with a second pin of the revolving body is formed on the cam. 2. A drive shaft rotatably supported by the cylinder head and connected to the crankshaft via rotation transmission means, and configured to rotate in synchronization with rotation of the engine, and disposed in parallel with the drive shaft. A support shaft rotatably supported by the cylinder head; a control housing rotatably fitted to the support shaft; a control housing engaged with the control housing, and swinging the control housing around the support shaft. A control shaft to be moved, and a control shaft arranged in parallel to face the control housing,
A swinging cam having a support housing fixed to the cylinder head, and a cam surface slidably disposed on the upper side of the valve lifter on the side opposite to the side of the control housing facing the support housing and slidably contacting the valve lifter; A drive disk having a driven gear that meshes with a drive gear of the drive shaft is rotatably supported by the support housing, and a cam driver is rotated coaxially with the drive disk by the control housing. A first pin that is movably supported and protrudes toward one of the drive disk and the cam driver at a position eccentric from one of the rotation shafts of the drive disk and the cam driver. The other one of the drive disk and the cam driver slides into the first pin. First to engage
A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation axis of the cam driver. An intake / exhaust valve drive control device for an internal combustion engine, wherein a second pin engaging portion slidably engaged with a second pin of the revolving body is formed on the cam. 3. The drive control device for an intake / exhaust valve of an internal combustion engine according to claim 2, wherein the drive shaft is arranged at a position away from the control housing. 4. The drive shaft according to claim 1, wherein the drive shaft extends through the control housing, and a gap is formed between the drive shaft and the control housing to allow the control housing to swing. 3. An intake and exhaust valve drive control device for an internal combustion engine according to 2. 5. An intake / exhaust valve drive control apparatus for an internal combustion engine according to claim 1, wherein said swing cam is rotatably fitted to said drive shaft. 6. The swing cam according to claim 2, wherein the swing cam is rotatably fitted to the support shaft.
An intake / exhaust valve drive control device for an internal combustion engine according to any of the preceding claims. 7. A drive shaft rotatably supported by the cylinder head and connected to the crankshaft via rotation transmission means, and configured to rotate in synchronization with rotation of the engine, and arranged in parallel with the drive shaft, A first support shaft rotatably supported by the cylinder head; a second support shaft disposed parallel to the first support shaft and rotatably supported by the cylinder head; A control housing rotatably fitted to the first support shaft; a control shaft engaged with the control housing to swing the control housing around the first support shaft; Are arranged in parallel so that
A support housing fixed to the cylinder head, disposed on the valve lifter on the opposite side of the control housing from the side facing the support housing, and swingably supported by the second support shaft; A swinging cam having a cam surface that slides on the valve lifter; a drive disk having a driven gear that meshes with a drive gear of the drive shaft is rotatably supported on the support housing; A cam driver is rotatably supported coaxially with the drive disk, and at a position eccentric from one of the rotation shafts of the drive disk and the cam driver, the cam driver is moved to one of the other of the drive disk and the cam driver. A first pin protruding toward the drive disk; and one of the drive disk and the cam driver. The person, the slidably engaged with the first pin 1
A revolving body having a second pin protruding toward the swing cam is rotatably accommodated at a position eccentric from the rotation axis of the cam driver. The cam is formed with a second pin engaging portion slidably engaged with a second pin of the revolving body, and the drive shaft is arranged at a position away from the control housing. Intake and exhaust valve drive control device for an internal combustion engine. 8. An intake / exhaust valve drive control apparatus for an internal combustion engine according to claim 1, wherein the drive gear and the driven gear have a gear ratio of one to two.