JPH0674011A - Valve timing controller of engine - Google Patents

Abstract

PURPOSE:To reduce sliding spots necessary to rock a rocking cam for lifting an intake valve or exhaust valve of an engine. CONSTITUTION:A rocking cam 12 is rocked sliding through a rush adjuster on an intake or exhaust valve 10 of an engine to lift the valve 10 as it is rocked. The rocking cam 12 is formed on the cam surface with a lift arcuate part not to lift the valve 10 even in sliding on the valve 10 and a lift arcuate part to lift the valve 10 in sliding on the valve 10. A driving cam 14 is supported by a driving cam shaft 15 to rock the rocking cam 12 as it is rotated. The opening and closing timing of the valve 10 is changed by the shift of the rocking center of the rocking cam 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing control device for an engine that changes the opening / closing timing of an intake valve or an exhaust valve according to the operating state of the engine.

[0002]

2. Description of the Related Art As a valve timing control device for an engine as described above, as disclosed in JP-A-55-137306, a drive cam that rotates in synchronization with the rotation of the engine and the drive cam. Of the engine and the valve for intake and exhaust in sliding contact with the rocking lever that rocks with the rotation of the rocking lever, and lifts the valve of the engine with the rocking. It is known to have an oscillating cam.

The cam surface of the rocking cam in this engine valve timing control device is provided with a basic arc portion that does not lift the intake / exhaust valve even if it slides, and adjacent to the basic arc portion. A lift arc portion that lifts the intake / exhaust valve when it is slidably contacted is formed, and the lever ratio is changed by moving the swing center of the swing lever, thereby the intake / exhaust valve. The lift amount, and consequently the opening / closing time of the valve are changed. That is, when the swing center of the swing lever moves toward the swing cam, the lever ratio increases and the length of the portion of the drive cam that slides in contact with the swing lever expands to the vicinity of the nose portion. Therefore, the lift amount of the intake / exhaust valve increases and the opening time of the valve increases. On the other hand, when the swing center of the swing lever moves toward the drive cam, the lever ratio becomes smaller and the length of the portion of the drive cam that makes sliding contact with the swing lever is limited to the nose portion. Therefore, the lift amount of the valve is decreased and the opening time of the valve is shortened.

[0004]

However, in the above-described valve timing control device for an engine, in order to swing the swing cam, the drive cam and the swing lever are brought into sliding contact with each other and the swing lever and Since it has to make sliding contact with the oscillating cam, there are many sliding contact points, so the mechanical resistance is large and it is difficult to manage the clearance at the sliding contact points.

Further, since there are many sliding contact points, the rigidity of the force transmission system is reduced, which causes a problem that the engine rotation limit is reduced.

The present invention solves the above-mentioned problems all at once, and reduces the sliding contact points required for rocking the rocking cam, thereby reducing the mechanical resistance and the clearance of the sliding contact points. In addition to facilitating control of the engine, the rigidity of the force transmission system is improved to improve the engine rotation limit.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 swings a swing cam by a drive cam rotating following a drive cam shaft, and at the same time, the swing cam. The opening / closing timing of the intake valve or the exhaust valve is changed by moving the swing center of the.

Specifically, the solution means taken by the invention of claim 1 is to swing and swing the valve timing control device of the engine in a state of directly or indirectly slidingly contacting an intake valve or an exhaust valve of the engine. The oscillating cam which lifts the intake valve or the exhaust valve in association with the above, and the oscillating cam which is in contact with the oscillating cam and is rotated so as to follow the oscillating cam shaft are supported by the oscillating cam. ,
A drive cam that causes the swing cam to swing with rotation,
A swing cam moving means for moving the swing center of the swing cam so that the opening / closing timing of the intake valve or the exhaust valve is changed.

According to a second aspect of the present invention, a swing arm is provided between the intake valve or the exhaust valve and the swing cam, and the swing arm is swung by the swing cam, so that the intake valve or the exhaust valve is exhausted. Specifically, the operation of the valve for operation is stabilized, and specifically, in the structure of claim 1, between the intake valve or the exhaust valve and the swing cam, the pressed surface has the swing cam. A swing arm which is in contact with the cam surface of the swing cam, swings following the swing of the swing cam, and lifts the intake valve or the exhaust valve in accordance with the swing. The cam moving means is configured to move the swing center of the swing cam so that the cam surface of the swing cam moves along the pressed surface of the swing arm.

The invention of claim 3 limits the swing cam moving means, and more specifically, the invention is defined by claim 1.
In the above configuration, the swing cam moving means holds the swing cam swingably and reciprocates in a sliding contact movement direction in which the swing cam directly or indirectly makes sliding contact with an intake valve or an exhaust valve. A swing cam holding member that is movably provided;
A rack provided so as to reciprocate in a direction perpendicular to the sliding contact movement direction, a pinion provided so as to mesh with the rack and rotate with the reciprocating movement of the rack, and one end thereof is fixed to the pinion. On the other hand, the other end is screwed to the swing cam holding member, and a screw member provided so as to be rotatable but immovable in the axial direction is added.

The invention of claim 4 limits the swing cam moving means, and specifically, the invention is defined by claim 1 or 2.
In the above configuration, the swing cam moving means holds the swing cam swingably and reciprocates in a sliding contact movement direction in which the swing cam directly or indirectly makes sliding contact with an intake valve or an exhaust valve. A swing cam holding member that is movably provided;
A rotary shaft provided to be rotationally driven, a first eccentric member provided to the rotary shaft so as to rotate in an eccentric state with respect to a rotation center of the rotary shaft, and the swing cam holding member. A first eccentric member for engaging the first eccentric member,
The second eccentric member that reciprocates with the rotation of the eccentric member and reciprocates the swing cam holding member is added.

The invention of claim 5 limits the swing cam moving means, and specifically, claims 1 or 2
In the above configuration, the swing cam moving means holds the swing cam swingably and reciprocates in a sliding contact movement direction in which the swing cam directly or indirectly makes sliding contact with an intake valve or an exhaust valve. A swing cam holding member that is movably provided;
A rotary shaft provided to be rotationally driven, a pinion provided to rotate in association with the rotary shaft, and the rocking cam holding member provided to mesh with the pinion. A rack and a rack which reciprocate with the rotation and reciprocate the swing cam holding member is added.

[0013]

According to the first aspect of the invention, since the swing cam moving means for moving the swing center of the swing cam is provided so that the opening / closing timing of the intake valve or the exhaust valve is changed, the swing cam moving means is provided. The angle of the swing cam changes when the rotation angle of the drive cam is a predetermined amount as the swing center moves, and with this change, directly or indirectly to the intake valve or exhaust valve on the cam surface of the swing cam. Since the area in sliding contact with the valve changes, the opening / closing timing of the intake valve or the exhaust valve changes.

Further, since the rocking cam is directly driven by the driving cam, the rocking lever is not necessary and the sliding contact points are reduced.

According to the structure of claim 2, since the swing arm is arranged between the intake valve or the exhaust valve and the swing cam, and the swing arm is swung by the swing cam, the swing cam swings. Even if the center of movement moves, only the part where the cam surface of the swing cam presses the pressed surface of the swing arm differs, and the part where the swing arm presses the intake valve or the exhaust valve does not change.

According to the structure of claim 3, when the rack is reciprocally driven in the direction perpendicular to the sliding contact movement direction, the pinion rotates, and the screw member fixed to one end of the pinion also rotates accordingly. Since the screw member is provided so as to be immovable in the axial direction and the other end is screwed into the swing cam holding member, the swing cam holding member reciprocates in the sliding contact movement direction as the screw member rotates. The oscillating center of the oscillating cam reciprocates in the sliding contact movement direction.

According to the structure of claim 4, when the rotary shaft is rotationally driven, the first eccentric member rotates while being eccentric to the rotary shaft. Since the second eccentric member reciprocates with the rotation of the first eccentric member, the second eccentric member, and thus the swing cam holding member, reciprocates in the sliding contact movement direction with the rotation of the rotating shaft. Following this, the swing center of the swing cam also reciprocates in the sliding contact movement direction.

According to the fifth aspect of the invention, when the rotary shaft is driven to rotate, the pinion rotates, and with the rotation of the pinion, the rack and thus the swing cam holding member reciprocates in the sliding contact movement direction. The swing center of the swing cam also reciprocates in the sliding contact movement direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, and the principle of the present invention will be described based on FIG.

In the figure, 10 is a valve for intake or exhaust of an engine, 11 is a lash adjuster for opening and closing the valve 10, and 12 is rocking in a state of sliding contact with the lash adjuster 11, and with rocking. A swing cam that lifts the valve 10 through the lash adjuster 11, 1
3 is a swing cam shaft that rotatably holds the swing cam 12, 14 is a drive cam that swings the swing cam 12 in accordance with the rotation, and 15 holds the drive cam 14, while rotating the engine body. A driving cam shaft 16 which is freely held, and a rocking cam 1 in a state where the driving cam shaft 16 is in contact with the driving cam 14.
A roller which is rotatably supported by 2 and rotates with the rotation of the drive cam 14 and swings the swing cam 12, and 17 biases the swing cam 12 toward the drive cam 14. This is a spring that keeps the roller 16 in contact with the driving cam 14 at all times.

On the cam surface 12a of the oscillating cam 12, there is a perfect circular basic arc portion 12b which does not lift the valve 10 even if it comes into sliding contact with the lash adjuster 11 and by extension the valve 10, that is, does not open the intake port or the exhaust port, and the valve. A lift arc portion 12c that lifts the valve 10 when slidingly contacting the valve 10, that is, opens the intake port or the exhaust port is formed.

As shown in FIG. 1, when the rocking center of the rocking cam 12 moves between C1 and C2, the rocking area of the rocking cam 12 when the driving cam 14 rotates by a predetermined amount. Change. That is, the swing center of the swing cam 12 is C
2, when the swing center 12 swings by the same amount as in the case where the swing center is at C1, the basic arc portion 12b on the cam surface 12a of the swing cam 12 has the lash adjuster 11 The amount of sliding contact with the upper surface of the.
Along with this, the lift arc portion 12 on the cam surface 12a
The amount of c slidingly contacting the upper surface of the lash adjuster 11 decreases, and the lift amount of the valve 10 decreases.

FIG. 2 shows changes in the lift amount of the valve 10 when the swing center of the swing cam 12 moves.
Is the valve 1 when the swing center of the swing cam 12 is at C1.
0 indicates the lift amount, B indicates the swing center of the swing cam 12 is C
The lift amount of the valve 10 in the case of 2 is shown. In this way, the valve timing control device according to the present invention can control the opening / closing timing of the valve 10.

FIG. 3 shows a valve timing control system for an engine according to the first embodiment of the present invention.

In the first embodiment, the pair of left and right swing cams 12 and 12 swing by the rotation of one drive cam 14,
Along with this, two intake or exhaust valves 10, 1
0 is a type that moves up and down.

In the first embodiment, a swing arm 18 extending toward the drive cam 14 is provided integrally with the pair of left and right swing cams 12, 12 between the pair of left and right swing cams 12, 12. The roller 16 is rotatably held by the swing arm 18.

Both ends of the rocking cam shaft 13, which holds the pair of right and left rocking cams 12, 12 and the rocking arm 18, are rotatably held by a frame 19 having a U-shape in plan view.

Although not shown in the figure, there is provided a drive means, which is composed of hydraulic pressure or a worm gear, for moving the frame 19 between the position shown by the solid line and the position shown by the chain double-dashed line. The frame 19 constitutes rocking cam moving means for moving the rocking center of the rocking cam 12. Therefore, when the drive means is operated to move the frame 19, the swing cam shaft 13 and thus the swing center of the swing cam 12 move, and the opening / closing timing of the valve 10 changes accordingly.

FIG. 4 shows an engine valve timing control device according to a modification of the first embodiment. The same members as those of the first embodiment are designated by the same reference numerals and their description is omitted.

In this modified example, a fork-shaped rocking engagement member 22 that projects toward the drive cam 14 and sandwiches the drive cam 14 between a pair of left and right rocking cams 12, 12.
Are integrally provided with the pair of right and left swing cams 12, and the swing engagement member 22 and thus the swing cams 12, 12 swing as the drive cam 14 rotates. When the swinging engagement member 22 is provided as in this modification, the spring 17 described above is provided.
It is possible to reduce the lift amount that is absorbed and invalidated by the basic arc portion 12b of the cam surface 12a of the swing cam 12 without increasing the spring force of.

FIG. 5 shows a valve timing control system for an engine according to a second embodiment of the present invention.

In the second embodiment, one swing cam 12 swings due to the rotation of one drive cam 14, and the swing arm 20 swings accordingly, so that two intake or exhaust air swings. This is a type in which the valves 10 and 10 of FIG.

In the second embodiment, the swing arm 20 is swingably supported via a swing arm shaft 21, and the pressed surface 20a thereof is swing cam 1.
The second cam surface 12a is in contact with the second cam surface 12a, and the rocking cam 12 rocks to rock the rocking cam 12 to move the valves 10, 10 up and down.

On the upper surface of the swing cam 12, a swing arm 18 extending toward the drive cam 14 is provided integrally with the swing cam 12, and the roller 16 is rotatably held by the swing arm 18. .

Both ends of the rocking cam shaft 13 that holds the rocking cam 12 are rotatably supported by the upper ends of a pair of left and right support arms 23L and 23R extending in the vertical direction. The lower ends of the support arms 23L and 23R are connected by a support shaft 24, and the support shaft 24 is rotatably held by an engine body (not shown).

A spur gear 2 is provided at the lower end of the left support arm 23L.
5 is provided, and a worm gear 26 extending in a direction orthogonal to the left support arm 23L is provided below the left support arm 23L, and the worm gear 26 and the spur gear 25 mesh with each other.

The pair of left and right support arms 23 described above
The L, 23R, the support shaft 24, the spur gear 25, and the worm gear 26 constitute a swing cam moving means. When the worm gear 26 is rotated, the spur gear 25 moves in the axial direction of the worm gear 26, and accordingly the left and right gears are moved. The upper ends of the pair of support arms 23L and 23R, and thus the swing center of the swing cam 12, moves so that the cam surface 12a of the swing cam 12 moves along the pressed surface 21a of the swing arm 21.

FIG. 6 shows a valve timing control system for an engine according to a modification of the second embodiment. The same members as those in the second embodiment are designated by the same reference numerals and their explanations are omitted.

In this modification, one swing cam 12 swings due to the rotation of one drive cam 14, and the swing arm 20 swings accordingly, so that two intake or exhaust valves are provided. 10 and 10 are of a type that moves up and down, and are equipped with a swing arm 20 similar to that of the first embodiment.

The drive cam 14 is provided on the upper surface of the swing cam 12.
A fork-shaped rocking engagement member 22 that projects toward the side and sandwiches the drive cam 14 is provided integrally with the pair of rocking cams 12, and the rocking cam shaft 13 that holds the rocking cams 12 is fixed. Both ends of the frame 19 are U-shaped in plan view
Held in.

Although not shown, drive means for moving the frame 19 in the same manner as in the first embodiment, which is composed of hydraulic pressure or a worm gear, is provided, and the swing cam 12 is driven by the drive means and the frame 19. Rocking cam moving means for moving the rocking center of. Therefore, by operating the driving means, the frame 1
When 9 is moved, the swing cam shaft 13 and thus the swing center of the swing cam 12 moves to the cam surface 12a of the swing cam 12.
Moves so as to move along the pressed surface 21a of the swing arm 21, and the opening / closing timing of the valve 10 changes accordingly.

FIG. 7 shows a valve timing control system for an engine according to a third embodiment of the present invention.

In the third embodiment, the pair of left and right swing cams 12 and 12 swing by the rotation of one drive cam 14,
Along with this, two intake or exhaust valves 10, 1
0 is a type that moves up and down.

In the third embodiment, a swing arm 18 extending toward the drive cam 14 is provided between the pair of left and right swing cams 12, 12 integrally with the pair of left and right swing cams 12, 12. However, the roller 16 provided in the first embodiment is not provided. Therefore, the sliding contact surface of the swinging arm 18 with the swinging cam 14 is formed in an arc shape, and the swinging arm 18 is formed so as to swing smoothly in accordance with the rotational movement of the swinging cam 14. ing.

Both ends of the rocking cam shaft 13 holding the pair of right and left rocking cams 12 and 12 and the rocking arm 18 are rotatably mounted on a frame 19 having a U-shape in plan view as a rocking cam holding member. The frame 19 is held by the engine body so as to be reciprocally movable in the axial direction of the valve 10. One end of a screw member 27 extending in a direction orthogonal to the center portion 19a, that is, the reciprocating direction of the frame 19 is screwed into the central portion 19a of the frame 19, and the other end portion of the screw member 27 has the screw. A pinion 28 that rotates around the axis of the member 27 is provided. The pinion 28 meshes with a rack 29, and when the rack 29 reciprocates in the direction of arrow a, it rotates in the direction of arrow b in conjunction with the reciprocating motion. The disk 3 is provided at the center of the screw member 27.
0 is provided integrally with the screw member 27, and the disk 30
Is held by the screw holding member 31 so as to be rotatable and immovable in the axial direction of the screw member.

The frame 19 and the screw member 2 described above
7, the pinion 28, the rack 29, the disk 30, and the screw holding member 31 constitute a swing cam moving means for moving the swing center of the swing cam 12, and when the rack 29 is moved in the direction of arrow a. , The pinion 28 rotates in the direction of arrow B, and the screw member 27 moves in the axial direction accordingly, so that the swing center of the frame 19 and thus the swing cam 12 moves in the direction orthogonal to the valve 10. Valve 10
The opening / closing timing of changes.

FIG. 8 shows a valve timing control device for an engine according to a first modification of the third embodiment. The same members as those of the third embodiment are designated by the same reference numerals and their description is omitted.

In the first modification, a through hole 32a having an elliptical cross section that is long in the vertical direction and extending in parallel with the central portion 19a of the frame 19 is provided in the central portion 19a of the frame 19 as the swing cam holding member. An eccentric outer ring 32 as a second eccentric member is provided integrally with the frame 19, and an eccentric inner ring 33 as a first eccentric member is provided inside the through hole 32a of the eccentric outer ring 32 with respect to the eccentric outer ring 32. The eccentric inner ring 33 is provided so as to be relatively rotatable, and is fixed to the rotating shaft 34 so as to rotate in a state of being eccentric with respect to the central axis of the rotating shaft 34. The rotating shaft 34 can be rotated by a rotating force of an electric motor (not shown) or a rotating force of the driving camshaft 15 introduced through a clutch mechanism or the like.

The frame 19 and the eccentric outer ring 3 described above
2, the swing cam 12 by the eccentric inner ring 33 and the rotating shaft 34
The rocking cam moving means for moving the rocking center of the shaft is constructed. When the rotary shaft 34 is rotated in the direction of arrow C, the eccentric inner ring 33 is eccentric to the rotary shaft 34 in the direction of arrow C. Since the eccentric outer ring 32 rotates in the direction of the arrow D in association with the rotation, the frame 19 and thus the swing cam 12 are rotated.
The swing center of moves in the direction orthogonal to the valve 10, and the opening / closing timing of the valve 10 changes.

FIG. 9 shows an engine valve timing control device according to a second modification of the third embodiment. The same members as those of the third embodiment are designated by the same reference numerals and their description is omitted.

In the second modified example, a rack 35 having a spur gear 35a on its upper surface and extending in a direction orthogonal to the central portion 19a of the frame 19 is provided at the central portion 19a of the frame 19 as the swing cam holding member. The rack 35, which is integrally provided, has a spur gear 36a on its lower surface and is meshed with a pinion 36 rotatably held by a rotary shaft 37. The rotating shaft 37 can be rotated by a rotating force of an electric motor (not shown) or a rotating force of the driving camshaft 15 introduced through a clutch mechanism or the like.

The frame 19, rack 35, and
The pinion 36 and the rotary shaft 37 constitute rocking cam moving means for moving the rocking center of the rocking cam 12. When the rotary shaft 37 is rotated in the direction of arrow E, the pinion 36 also moves in the direction of arrow E. It rotates, and along with this, rack 3
Since 5 moves in the direction of the arrow, the swing center of the frame 19 and thus the swing cam 12 moves in the direction orthogonal to the valve 10.

[0053]

As described above, according to the valve timing control device for an engine of the first aspect of the present invention, the swing center of the swing cam is set so that the opening / closing timing of the intake valve or the exhaust valve changes. Since the oscillating cam moving means for moving is provided, the angle of the oscillating cam changes with the movement of the oscillating center of the oscillating cam, and accordingly, the intake valve or the exhaust valve on the cam surface of the oscillating cam. Since the area in sliding contact with the valve changes, the opening / closing timing of the intake valve or the exhaust valve can be reliably changed.

Further, since the swing cam is directly driven by the drive cam, the number of sliding contact points is reduced, so that the mechanical resistance is reduced, the clearance of the sliding contact points is easily controlled, and the force transmission system is also provided. Since the rigidity of the engine is improved, the engine rotation limit is improved.

Therefore, according to the first aspect of the present invention, the valve timing of the engine can be controlled in the state where the reliable operation and the improvement of the engine rotation limit are ensured.

According to the second aspect of the invention, the swing arm is arranged between the intake valve or the exhaust valve and the swing cam, and the swing arm is swung by the swing cam. Even if the swing center moves, only the portion of the cam surface of the swing cam that presses the pressed surface of the swing arm differs, and the portion of the swing arm that presses the intake valve or exhaust valve does not change. Therefore, a stable lift operation of the intake valve or the exhaust valve can be obtained.

According to the third aspect of the present invention, when the rack is reciprocally driven in the direction perpendicular to the sliding contact moving direction, the pinion and, in turn, the screw member rotate, and the rocking cam holding member reciprocates in the sliding contact moving direction. Because of the movement, the swing center of the swing cam also reciprocates in the sliding contact movement direction, so the angle of the swing cam changes, and the opening / closing timing of the intake valve or the exhaust valve surely changes accordingly. .

According to the invention of claim 4, when the rotary shaft is driven to rotate, the first eccentric member rotates, and following this, the second eccentric member rotates.
Since the eccentric member, and thus the swing cam holding member, reciprocates in the sliding contact movement direction, the swing center of the swing cam also reciprocates in the sliding contact movement direction, so that the angle of the swing cam changes, and accordingly. The opening / closing timing of the intake valve or the exhaust valve changes reliably.

According to the fifth aspect of the present invention, when the rotary shaft is driven to rotate, the pinion rotates, and the rack and, consequently, the swing cam holding member reciprocates in the sliding contact movement direction, so that the swing cam swings. Since the center of motion also reciprocates in the sliding contact movement direction, the angle of the rocking cam changes, and along with this, the opening / closing timing of the intake valve or the exhaust valve surely changes.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram showing a change in a lift amount of an intake valve or an exhaust valve when a swing center of a swing cam moves.

FIG. 3 is a cutaway perspective view showing a valve timing control device for an engine according to the first embodiment of the present invention.

FIG. 4 is a cutaway perspective view showing a valve timing control device for an engine according to a modification of the first embodiment.

FIG. 5 is a cutaway perspective view showing an engine valve timing control device according to a second embodiment of the present invention.

FIG. 6 is a cutaway perspective view showing a valve timing control device for an engine according to a modification of the second embodiment.

FIG. 7 is a cutaway perspective view showing a valve timing control device for an engine according to a third embodiment of the present invention.

FIG. 8 is a cutaway perspective view showing a valve timing control device for an engine according to a first modification of the third embodiment.

FIG. 9 is a cutaway perspective view showing a valve timing control device for an engine according to a second modification of the third embodiment.

[Explanation of symbols]

 10 intake or exhaust valve 11 lash adjuster 12 swing cam 12a cam surface 12b basic arc portion 12c lift arc portion 13 swing camshaft 14 drive cam 15 drive camshaft 16 roller 19 frame (swing cam holding member) 20 Swing Arm 20a Pressed Surface 22 Swing Engaging Member 22L Left Support Arm 22R Right Support Arm 24 Support Shaft 25 Spur Gear 26 Worm Gear 27 Screw Member 28 Pinion 29 Rack 30 Disc 31 Screw Holding Member 32 Eccentric Outer Ring (Second Eccentric member) 33 Eccentric inner ring (first eccentric member) 34 Rotating shaft 35 Rack 36 Rotating shaft 37 Pinion

Claims (5)

[Claims] 1. A swing cam that swings in a state of directly or indirectly slidingly contacting an intake valve or an exhaust valve of an engine and lifts the intake valve or the exhaust valve with the swing, and the swing cam. A drive cam that is supported by the drive cam shaft so as to rotate in contact with the dynamic cam and follow the drive cam shaft, and that causes the swing cam to swing with rotation, and the intake valve. Alternatively, a valve timing control device for an engine, comprising: a swing cam moving means for moving the swing center of the swing cam so that the opening / closing timing of the exhaust valve changes. 2. The pressed surface is in contact with the cam surface of the swing cam between the intake valve or the exhaust valve and the swing cam, and follows the swing of the swing cam. A swing arm that swings and lifts the intake valve or the exhaust valve in association with the swing is provided, and the swing cam moving means has a cam surface of the swing cam that is pressed by the swing arm. The valve timing control device for an engine according to claim 1, wherein the swing center of the swing cam is moved so as to move along a surface. 3. The oscillating cam moving means holds the oscillating cam in a freely oscillating manner, and in the sliding contact moving direction in which the oscillating cam slides directly or indirectly with an intake valve or an exhaust valve. A swing cam holding member provided so as to be capable of reciprocating movement, a rack provided so as to be reciprocally driven in a direction perpendicular to the sliding contact movement direction, and a rack that meshes with the rack and rotates with the reciprocating movement of the rack. And a pinion member having one end fixed to the pinion and the other end screwed to the rocking cam holding member so as to be rotatable and immovable in the axial direction. The valve timing control device for an engine according to claim 1 or 2, wherein: 4. The oscillating cam moving means holds the oscillating cam in an oscillating manner, and moves the oscillating cam in a sliding contact moving direction in which the oscillating cam slides directly or indirectly with an intake valve or an exhaust valve. An oscillating cam holding member provided so as to be capable of reciprocating movement, a rotary shaft provided so as to be rotationally driven, and a rotary shaft provided so as to be eccentrically rotated about the rotation center of the rotary shaft The first eccentric member and the oscillating cam holding member are provided to engage with the first eccentric member and reciprocate with the rotation of the first eccentric member to hold the oscillating cam holding member. The valve timing control device for an engine according to claim 1 or 2, comprising a second eccentric member that reciprocally moves the member. 5. The oscillating cam moving means holds the oscillating cam in a freely oscillating manner, and in the sliding contact moving direction in which the oscillating cam slides directly or indirectly with an intake valve or an exhaust valve. A swing cam holding member provided so as to be capable of reciprocating movement, a rotary shaft provided to be rotationally driven, a pinion provided to rotate in association with the rotary shaft, and the swing cam holding member. The rack which is provided so as to mesh with the pinion and reciprocates with the rotation of the pinion to reciprocate the swing cam holding member. Engine valve timing controller.