JP2001152820A - Variable valve gear of engine - Google Patents

Abstract

(57) Abstract: A variable valve device capable of driving intake and exhaust valves at high speed while reducing power consumption and improving sound vibration performance. A valve body is provided with a pair of coil springs.
, The rotational driving force of the motor 12 is converted into a reciprocating linear movement of the valve stem 8 via a link mechanism, and the motor 12 drives the valve 1 to open and close. Further, a valve closing electromagnetic coil 32 and a valve opening electromagnetic coil 33 are provided, and the electromagnetic force of the valve closing electromagnetic coil 32 and the valve opening electromagnetic coil 33 is used together at a low temperature or at a high vehicle speed, so that the valve element 1 is provided. Is quickly and reliably driven to open and close.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable valve operating device for an engine, and more particularly, to a variable valve operating device configured to drive an intake / exhaust valve to be opened and closed by an actuator.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned variable valve train, Japanese Patent Application Laid-Open Nos. Hei 10-332027 and Hei 11-1320
There is an electromagnetic variable valve device as disclosed in Japanese Patent Publication No.

[0003] The above-described conventional variable valve device energizes an intake / exhaust valve to a neutral position by a pair of springs, while driving an intake / exhaust valve in an opening direction by electromagnetic force, and a valve opening electromagnetic coil; A valve closing electromagnetic coil for driving the intake / exhaust valve in the valve closing direction by electromagnetic force, and by supplying an exciting current to the open / close valve electromagnetic coil alternately, the intake / exhaust valve is brought into the fully open position. It reciprocates between the fully closed position.

[0004]

However, in the variable valve operating device having the above-described structure, if the power supply to the electromagnetic coil is cut off when the engine is stopped, the intake / exhaust valve stops at the neutral position. When the engine is stopped immediately after high-load operation, high-temperature gas flows back to the intake side, damaging thermally weak parts on the intake side, and when restarting the engine, shut off the intake and exhaust valves. It is necessary to start the drive after initializing to the fully open position or the fully closed position, and there is a problem that the start time is long and the power consumption at the start is large.

In order to increase the opening / closing speed of the intake / exhaust valve, the spring constant of the spring may be increased. However, if the spring constant is increased, the electromagnetic force required to hold the fully open / fully closed position is reduced. As a result, there is a problem that the power consumption when the fully-open / fully-closed position is maintained is increased and the fuel economy performance is reduced.

Further, in the conventional device, the movement of the intake / exhaust valve is abutted and stopped at the fully open / fully closed (seated) position, and the repulsive force of the spring is largest at the fully open / fully closed position. Therefore, it is difficult to control the position in the vicinity of the fully open / fully closed position, and there is a problem that the sound at the time of the abutment deteriorates the sound and vibration performance when trying to drive it to the fully open / fully closed position. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to reduce power consumption and improve sound vibration performance.
It is an object of the present invention to provide a variable valve operating device capable of driving an intake / exhaust valve at high speed.

Further, the intake / exhaust valve can be held at the fully open or fully closed position while the engine is stopped, so that the backflow of the high-temperature gas can be prevented, and the starting time is not required and the starting time can be shortened. It is an object to provide a variable valve operating device.

[0009]

According to the present invention, there is provided an elastic body for urging an intake / exhaust valve to a neutral position, and a reciprocating linear movement along the opening / closing direction of the intake / exhaust valve. , And an actuator for applying a rotational driving force to the rotary motion portion.

According to this configuration, when the actuator applies a rotational driving force to the rotational movement portion, the rotational driving force acts as a driving force for opening and closing the intake / exhaust valve via the conversion mechanism, and the urging force of the elastic body is reduced. It is driven in the opening and closing directions in opposition.

According to the second aspect of the present invention, the conversion mechanism is constituted by a link having one end eccentrically connected to the rotating portion and the other end connected to a valve stem of the intake / exhaust valve. did.

[0012] According to this configuration, one end is eccentrically connected to the rotary motion portion, and the other end is connected to the valve stem (or valve lifter) of the intake / exhaust valve, so that the link between the rotary motion and the reciprocating linear motion is formed. The conversion is performed, and the rotational movement of the rotating part and the reciprocating linear movement of the intake and exhaust valves are performed integrally.

According to the third aspect of the present invention, the conversion mechanism is provided integrally with the intake / exhaust valve and has a long hole extending in a direction perpendicular to the axis of the intake / exhaust valve, and the conversion mechanism is eccentric to the rotary motion portion. And a rotator fitted and inserted into the elongated hole, wherein the rotator orbits around the rotation axis of the rotating portion while reciprocating in the longitudinal direction in the elongated hole.

According to this configuration, when the rotor inserted into the elongated hole is driven to rotate by the actuator, the suction hole perpendicular to the longitudinal direction is inserted into the elongated hole while reciprocating in the elongated hole in the elongated direction.
Since the rotor is pressed in the opening / closing direction of the exhaust valve, the orbiting motion of the rotor is converted into a reciprocating linear motion along the opening / closing direction of the intake / exhaust valve, and the intake / exhaust valve is opened / closed integrally with the rotor.

According to a fourth aspect of the present invention, a configuration is provided in which a lock mechanism for fixing the rotary motion portion is provided. According to this configuration, since the rotational position of the rotary motion part and the open / close state of the intake / exhaust valve have a fixed correlation, by fixing the rotary motion part with the lock mechanism, the open / close state of the intake / exhaust valve is set to the predetermined position. Will be fixed.

According to a fifth aspect of the present invention, the lock mechanism is constituted by a brake mechanism for braking the rotating portion. According to such a configuration, the opening / closing state of the intake / exhaust valve is fixed at a predetermined position by stopping the rotary movement portion at a predetermined angle by the brake mechanism for braking the rotary movement portion.

According to a sixth aspect of the present invention, the intake / exhaust valve is fixed to a fully open or fully closed position by the lock mechanism when the engine is stopped. According to such a configuration,
By fixing the rotating part with the exhaust valve in the fully open or fully closed position, even if the driving force to the fully open or fully closed position stops working due to the engine stop, it resists the urging force of the elastic body. As a result, the intake / exhaust valve is held at the fully open or fully closed position, and the restart is performed with the fully open or fully closed position of the intake / exhaust valve as an initial state.

According to the present invention, the conversion mechanism is provided on both sides of the valve stem. According to this configuration, the valve stem (or valve lifter)
A driving force along the opening and closing direction of the intake / exhaust valve is transmitted to both sides of the valve. The drive system consisting of the actuator and the conversion mechanism is a valve stem (or valve lifter).
May be provided independently on both sides of the valve stem, or the driving force of one actuator may be transmitted by conversion mechanisms provided on both sides of the valve stem (or valve lifter).

According to an eighth aspect of the present invention, a valve opening electromagnetic coil for driving the intake / exhaust valve in the valve opening direction by electromagnetic force, and a valve closing for driving the intake / exhaust valve in the valve closing direction by electromagnetic force. And an electromagnetic coil for use.

According to this configuration, as a drive source for opening and closing the intake and exhaust valves, an electromagnetic coil for opening and closing is provided in addition to the actuator. When an exciting current is supplied to the electromagnetic coil for valve opening, the electromagnetic force is generated. When the intake / exhaust valve is driven in the valve opening direction and an exciting current is supplied to the valve closing electromagnetic coil, the electromagnetic force drives the intake / exhaust valve in the valve closing direction.

According to a ninth aspect of the present invention, the intake / exhaust valve is driven by the electromagnetic coil for opening / closing to a position close to full-closed / fully-opened, and the state of full-closed / full-open is maintained by the actuator. did.

According to this configuration, when the intake / exhaust valve is driven to the fully closed / nearly open position by the electromagnetic force of the opening / closing electromagnetic coil, the rotational driving force of the actuator is converted into reciprocal linear motion by the conversion mechanism. To keep it fully closed and fully open.

According to the tenth aspect of the present invention, the intake / exhaust valve is driven to near the fully closed / full open state by the electromagnetic coil for opening / closing and the actuator, and the fully closed / full open state is maintained only by the actuator. It was configured to be performed.

According to this configuration, when the intake / exhaust valve is driven to near the fully-closed / fully-opened position by the electromagnetic force of the electromagnetic coil for opening / closing and the rotational driving force of the actuator, the excitation current is supplied to the electromagnetic coil thereafter. It stops and is kept in a fully closed / fully opened state only by the rotational driving force of the actuator.

According to the eleventh aspect of the present invention, the intake / exhaust valve is opened / closed only by the actuator, or the intake / exhaust valve is opened / closed by the electromagnetic coil for opening / closing and the actuator.
Whether to open or close the exhaust valve is selected according to the operating conditions.

According to this configuration, whether or not to use the opening / closing drive force of the electromagnetic valve for opening / closing valve is selected depending on the operating condition, and the electromagnetic coil for opening / closing valve is selected only when required by the operating condition. Supply the excitation current.

According to the twelfth aspect, the selection is made based on the temperature of the engine. According to this configuration, the opening / closing electromagnetic coil is selectively used in accordance with the level of the engine temperature. For example, when the friction is large and the temperature is low, the opening / closing electromagnetic force by the opening / closing electromagnetic coil is added. The opening and closing driving force that matches the friction is secured.

According to a thirteenth aspect of the present invention, the selection is made based on at least one of an engine load and an engine speed. According to this configuration, a region where the intake / exhaust valve is required to be quickly opened / closed or a region where reliable opening / closing operation is required is determined based on the engine load and / or the engine rotation speed, and the opening / closing by the opening / closing electromagnetic coil is determined. A drive force is applied to open and close the intake and exhaust valves.

[0029] In the invention according to claim 14, the selection is made based on the vehicle speed. According to this configuration, the vehicle speed is used to determine a condition that can prioritize securing of the opening / closing speed and the opening / closing drive force over the sound vibration performance and the like, and the opening / closing drive force by the opening / closing solenoid coil is added to the intake / exhaust valve. Open and close operation.

[0030]

According to the first aspect of the present invention, since the intake / exhaust valve opens and closes integrally with the rotational movement of the rotational movement part, the number of collision parts can be reduced and the sound and vibration performance can be improved. The biasing force of the elastic body does not act in the direction of rotation of the rotating part at the fully closed / fully opened position, and the stroke of the intake / exhaust valve with respect to the rotation angle decreases near the fully closed / fully opened position. -The control to the fully open position can be easily and accurately performed, and the energy consumption (power consumption) is small.

According to the second aspect of the present invention, there is an effect that the conversion between the reciprocating linear motion and the rotary motion of the intake / exhaust valve can be easily and reliably performed by using a so-called piston crank mechanism. .

According to the third aspect of the present invention, the conversion between the reciprocating linear motion and the rotary motion of the intake / exhaust valve is performed by the configuration in which the rotor reciprocates in the elongated hole while reciprocating. Is relatively small.

According to the fourth aspect of the present invention, the rotary movement portion is locked at the fully open or fully closed position of the intake / exhaust valve, so that it can be held at the fully open or fully closed position without consuming energy. There is an effect that can be.

According to the fifth aspect of the present invention, there is an effect that the rotation of the rotary motion part can be locked with a simple configuration and the intake / exhaust valve can be held at the fully open or fully closed position. According to the sixth aspect of the present invention, when the engine is stopped, the rotary motion portion is locked, and the intake / exhaust valve is held at the fully open or fully closed position. This eliminates the need for initialization control from the neutral position to the fully open or fully closed position, and has the effect of shortening the starting time and reducing energy consumption at the time of starting.

According to the seventh aspect of the present invention, since the intake and exhaust valves are opened and closed with both ends rather than cantilever, the valve stem (or valve lifter) can be prevented from tilting and smooth opening and closing operation can be realized. There is.

According to the eighth aspect of the present invention, a more reliable and faster opening / closing operation can be performed by combining the opening / closing driving force obtained by converting the rotational driving force by the actuator with the opening / closing driving force by the electromagnetic coil. There is an effect that it becomes possible.

According to the ninth aspect of the invention, it is possible to precisely control the fully open or fully closed position while performing the quick opening and closing operation by the opening and closing driving force by the electromagnetic force, and to reduce the holding of the fully open or fully closed position. There is an effect that energy consumption can be achieved.

According to the tenth aspect of the present invention, the opening and closing driving force by the electromagnetic coil and the opening and closing driving force obtained by converting the rotational driving force by the actuator are simultaneously acted to reliably operate to the fully open or fully closed position. In addition to this, there is an effect that the control can be accurately performed to the fully open or fully closed position, and the fully open or fully closed position can be maintained with a small amount of energy consumption.

According to the eleventh aspect, it is possible to select the addition of the opening / closing driving force by the electromagnetic coil as required, and it is possible to avoid unnecessary use of the electromagnetic coil and reduce power consumption.

According to the twelfth aspect, when the engine temperature is low and the friction is large, there is an effect that the opening and closing driving force by the electromagnetic coil can be additionally used to perform a reliable opening and closing operation.

According to the thirteenth aspect of the present invention, a region where the opening / closing operation is to be reliably performed or a region where the opening / closing operation is desired to be accelerated is properly determined from the engine load and / or the engine rotation speed by additionally using the opening / closing driving force of the electromagnetic coil. Thus, there is an effect that the opening / closing drive can be performed with characteristics according to the operating range of the engine while reducing power consumption.

According to the fourteenth aspect of the present invention, the opening and closing driving force by the electromagnetic coil can be used at a high vehicle speed where priority can be given to ensuring the opening and closing speed and the opening and closing driving force over the sound vibration performance and the like. There is an effect that the opening and closing driving force by the electromagnetic coil can be added without deteriorating the performance and the like.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A, 1B and 1C show a first embodiment of a variable valve apparatus for an engine according to the present invention.

In FIG. 1, a valve element 1 is an intake valve or an exhaust valve for closing a port of a cylinder head.
And a valve stem 3. The valve stem 3 is slidably supported in the axial direction with respect to the cylinder head, and the valve is opened by projecting the umbrella portion 2 into the combustion chamber to open the port to the combustion chamber. The valve is closed when the peripheral edge of the umbrella portion 2 is seated on the seat surface provided on the peripheral edge of the portion from the combustion chamber side.

A flange 4 fixed to the base end of the valve stem 3 and a flange 5 fixed to the cylinder head so as to face the lower side of the flange 4.
Between them, a coil spring (elastic body) 6 is interposed in a compressed state, and urges the valve stem 3 in a direction of lifting up the valve stem 3 in the figure (valve closing direction).

On the base end side of the valve stem 3, a housing 7 constituting a valve operating mechanism is fixed, and on the housing 7, a valve stem 8 for opening and closing drive is slid coaxially with the valve stem 3. It is movably supported so as to protrude downward from the inside of the housing 7.

A coil spring (elastic body) 11 is provided between a flange portion 9 fixed to the base end side of the valve stem 8 for opening and closing and a flange portion 10 fixed to a ceiling surface in the housing 7. The coil spring 11 urges the valve stem 8 for opening / closing drive downward (in the valve opening direction).

When no opening / closing drive force by the motor described later is applied, the open / close drive valve is set at a neutral position between the fully closed position and the fully open position where the biasing forces of the coil springs 6 and 11 are balanced. With the stem 8 and the valve stem 3 abutting against each other, the valve body 1
Will be elastically supported.

A motor 12 (actuator) is fixed on the upper surface of the housing 7, and the rotation axis of the motor 12 is orthogonal to the axes of the valve stem 3 and the valve stem 8 for opening / closing drive. A rotating disk 1 is provided at the tip of the rotating shaft.
3 (rotationally moving part) is supported, and a pin 14 is erected on the rotating disk 13 so as to be eccentric.

On the other hand, a plate-like link member 15 is provided,
By fitting the pin 14 into a hole opened at one end of the link member 15, one end of the link member 15 is rotatably connected to the pin 14.

A connecting rod 16 is formed integrally with the opening / closing drive valve stem 8 at an intermediate portion thereof so as to extend in parallel with the rotation axis of the motor 12 on a plane including the rotation axis of the motor 12. By connecting the connecting rod 16 to a hole opened at the other end of the link member 15, the link member 1
The other end of 5 is rotatably connected to connecting rod 16.

The reciprocating linear motion of the valve stem 8 for opening and closing along the axial direction and the motor 12 of the pin 14 provided eccentrically with respect to the rotating disc 13 by the pin 14, the link member 15 and the connecting rod 16. A conversion mechanism is configured to perform conversion between orbital movement around the rotation axis.

That is, when the pin 14 is at the lowest position along the axial direction of the opening / closing drive valve stem 8, the opening / closing drive valve stem 8 is in the state of being lowered to the maximum.
At this time, the valve stem 3 is pushed down by the tip of the valve stem 8 for opening / closing drive, and the valve body 1 is brought to the fully open position where the valve body 1 protrudes into the combustion chamber.

On the other hand, when the pin 14 is at the highest position (top dead center TDC) along the axial direction of the valve stem 8 for opening and closing, the valve stem 8 for opening and closing is in the state of maximum lift. Until immediately before the lift, the valve stem 3 is abutted against the opening / closing drive valve stem 8 by the urging force of the coil spring 6 and lifts integrally, but the opening / closing drive is slightly smaller than the lift amount on which the valve body 1 is seated. When the valve element 1 is seated (fully closed), the valve stem 8 for opening and closing is separated from the valve stem 3 so that only the valve stem 8 for opening and closing is lifted. It is.

In the variable valve operating device having the above structure, the motor 12
By rotating the rotating disk 13 (pin 14), the valve body 1 can be driven to open and close. That is, if the pin 14 is driven to the top dead center in the drawing, the valve body 1 can be controlled to be fully closed. Conversely, if the pin 14 is driven to the bottom dead center in the drawing, the valve body 1 can be controlled to be fully opened, The valve body 1 can be kept fully closed or fully opened by holding it at the top dead center or the bottom dead center.

In the above configuration, although sound vibration is generated when the valve body 1 is seated, the moving range of the opening / closing drive valve stem 8 is determined by the conversion mechanism, and when the valve is opened, the valve stem 8 stops against the portion serving as a stopper. Since this is not the configuration, the sound vibration at the time of opening the valve can be eliminated, and the sound vibration performance can be improved.

In the fully opened and fully closed positions where the pin 14 is located in the radial direction along the axial direction of the valve stem 8 for opening and closing and the valve stem 3, the urging force of the coil springs 6, 11 causes the valve stem for opening and closing. 8 and valve stem 3
And the spring force does not act in the rotation direction (see FIG. 2), so that a large motor driving force is not required when the fully open and fully closed positions are maintained, and power consumption can be reduced.

As described above, since the spring force does not affect the holding of the fully open and fully closed positions, the spring constant of the coil springs 6 and 11 is increased to increase the urging force to speed up the opening and closing operation. Is possible.

Further, since the stroke of the valve body 1 with respect to the rotation angle of the rotating disk 13 (pin 14) is small near the fully open and fully closed positions, the movement of the valve body 1 at the time of seating can be accurately controlled. It is possible to suppress the sound vibration at the time of sitting.

In the embodiment shown in FIG. 1, the opening / closing drive force is transmitted to one side of the opening / closing drive valve stem 8 (cantilever method). However, FIGS.
As shown in the second embodiment shown in (C), a double-supported system using one motor 12 may be used.

In FIG. 3, the rotating shaft of the motor 12 is projected to both sides, and rotating disks 13a, 13b are supported at both ends of the rotating shaft, respectively.
The pins 14a and 14b are erected at the same angular position.

On the other hand, connecting rods 16a and 16b are coaxially and integrally provided on a plane including the rotating shaft of the motor 12 in parallel with the rotating shaft of the motor 12, and the pins 14a and 14b are connected to the connecting rod 16a.
a and 16b are connected via link members 15a and 15b, and the orbital movement of the pins 14a and 14b around the rotation axis of the motor is changed by the connecting rod 16 via the link members 15a and 15b.
a, 16b are converted into reciprocating linear motions.

As described above, if the conversion mechanism is provided on both sides of the valve stem and the opening and closing drive force is transmitted to both sides, the opening and closing drive valve stem 8 when the opening and closing drive force is applied is provided. The movement in the opening and closing direction can be smoothly performed by avoiding the occurrence of the inclination.

FIGS. 4A, 4B and 4C show a third embodiment. The configuration shown in FIG.
The basic configuration is the same as that of the first embodiment shown in FIG. 1, and the following description focuses on the differences in the configuration from FIG.

In FIG. 4, the valve stem 8 for opening and closing drive
A disk-shaped mover 31 is fixed coaxially with the axis of the valve stem 8 and a connecting rod 16 is erected on the peripheral surface of the mover 31, and the first embodiment shown in FIG. Similarly to the above, the conversion between the rotation of the motor 12 and the reciprocating linear motion of the valve stem 8 for opening and closing is performed by the conversion mechanism including the pin 14, the link member 15, and the connecting rod 16.

Therefore, as in the first embodiment, the pin 1
4 is the fully closed position of the valve body 1, the bottom dead center position of the pin 14 is the fully open position of the valve body 1, and the pin 14 is located between the top dead center and the bottom dead center position. Is the intermediate opening degree state of the valve element 1.

A valve closing electromagnetic coil 32 and a valve opening electromagnetic coil 33 are fixed to the housing 7 so as to sandwich the mover 31 from above and below, and an exciting current is supplied to the valve closing electromagnetic coil 32. Then, the movable element 31 is attracted to the upper valve closing electromagnetic coil 32 by the electromagnetic attraction force, whereby the opening / closing drive valve stem 8 is driven upward (in the valve closing direction) integrally with the movable element 31. Similarly, when an exciting current is supplied to the valve opening electromagnetic coil 33, the movable element 31 is attracted to the lower valve opening electromagnetic coil 33 by the electromagnetic attraction force, so that the opening / closing drive valve stem is integrally formed with the movable element 31. 8 is driven downward (in the valve opening direction) (FIG. 5).
(See (A), (B) and (C)).

As described above, the provision of the valve closing electromagnetic coil 32 and the valve opening electromagnetic coil 33 enables a more reliable and faster opening / closing operation. For example, the motor 12
When the motor is driven to open and close by the rotational drive force of the motor and the electromagnetic force of the electromagnetic coils for opening and closing 32, 33, and the full opening and the full closing are controlled only by the control of the motor 12, the power consumption when the full opening and the full closing are maintained. , And the opening and closing operation can be performed reliably and quickly. Further, the opening and closing operation may be performed only by the electromagnetic force of the opening and closing electromagnetic coils 32 and 33, and the fully open and fully closed states may be maintained only by controlling the motor 12.

In the third embodiment shown in FIG. 4, a brake mechanism including a pair of brake shoes 41 and 42 pressed against the peripheral surface of the rotating disk 13 (rotating part) is provided. I have.

The brake shoes 41 and 42 are configured to be pressed against the peripheral surface of the rotary disc 13 when the ignition switch is turned off by a cam mechanism or the like, and act between the brake shoes 41 and 42 and the rotary disc 13. The rotating disk 13 is locked by the frictional force while the engine is stopped, and corresponds to a locking mechanism of the rotating disk 13 (rotationally moving portion). Here, since the opening of the valve body 1 is determined in accordance with the angular position of the rotating disk 13, if the angular position of the rotating disk 13 is fixed, the opening of the valve body 1 is fixed. Become.

When the ignition switch is turned off,
When the driving force of the motor 12 and the opening / closing electromagnetic coils 32 and 33 is lost, the valve element 1 is driven by the coil springs 6 and 11.
Is held at a neutral position between the fully closed position and the fully opened position where the urging forces are balanced, but if the rotating disk 13 is fixed by the brake shoes 41 and 42, the rotating disk 13 is held at the fixed position. For example, it is possible to hold the valve body 1 in a fully closed or fully open state while the engine is stopped.

In the configuration in which the valve element 1 is held at the neutral position while the engine is stopped, it is necessary to initialize the valve element 1 to the fully closed or fully opened position at the time of restart, and then to start the engine. However, if the valve body 1 is kept in a fully closed or fully opened state while the engine is stopped by the brake mechanism (locking mechanism), the initialization is not required, the starting time is reduced, and the electric power at the time of starting is reduced. Consumption can be reduced.

In the above description, the brake mechanism (lock mechanism) is operated while the engine is stopped. However, the brake mechanism may be used to keep the engine fully closed or open while the engine is operating. Also, the opening / closing electromagnetic coils 32, 33 shown in FIGS.
, A brake mechanism (lock mechanism) including the brake shoes 41 and 42 may be provided.

Further, as the lock mechanism, in addition to the above-described brake mechanism, for example, a configuration in which a lock pin is inserted into a hole opened in the rotating disk 13 may be used. Applicable.

FIGS. 6A, 6B, and 6C show a fourth embodiment, which is different from the third embodiment shown in FIG. 4 in the second embodiment shown in FIG. This is an application of the two-sided system shown in the embodiment.

FIGS. 7A, 7B and 7C show a fifth embodiment in which the structure of the conversion mechanism is changed. FIG.
At the end of the connecting rod 16, a long hole 51 extending in the lateral direction, that is, in the direction orthogonal to the axis of the
The box-shaped member 52 provided with the (concave portion) is integrally provided.

Further, a pin 14 is eccentrically set up on a rotating disk 13 (rotating portion) supported by the tip of the rotating shaft of the motor 12 so that the pin 14 is inserted into the elongated hole 51. , The motor 12 is fixed.

Here, the elongated hole 51 is integral with the valve stem 8 for opening / closing drive, and the elongated hole 51 can be moved only in the vertical direction. Therefore, as shown in FIG. 8, when the pin 14 rotates around the motor rotation axis with the rotation of the rotating disk 13, the pin 14 moves in the long hole 51 in the longitudinal direction and rises while the box-shaped member 52 moves. (The opening / closing drive valve stem 8) is pushed up, and when it is lowered, the box-shaped member 52 (opening / closing drive valve stem 8) is pushed down. A conversion between 8 reciprocating linear movements is performed.

Therefore, in the above configuration, the conversion mechanism is constituted by the pin 14 and the box-shaped member 52 (the elongated hole 51), and the configuration of the conversion mechanism can be simplified. FIG. 9 shows a sixth embodiment in which the conversion mechanism and the motor 12 shown in FIG. 7 are provided on both sides of the opening / closing drive valve stem 8.

In FIG. 9, connecting rods 16a and 16b are provided on both sides along an axis perpendicular to the opening / closing drive valve stem 8, and box-like members 52a and 52a having elongated holes 51a and 51b formed at the respective ends. 52b is fixed.

A drive system including motors 12a and 12b, rotating disks 13a and 13b, and pins 14a and 14b is provided corresponding to the box-shaped members 52a and 52b, respectively.

FIGS. 10 (A), (B), (C), (D),
(E) shows the switching electromagnetic coil 32,
FIG. 33 shows a seventh embodiment to which the third embodiment 33 is added.
Similarly, the connecting rod 16 is erected on the disk-shaped movable element 31 fixed coaxially with the axis of the valve stem 8.
A valve closing electromagnetic coil 32 and a valve opening electromagnetic coil 33 are fixed to the housing 7 so as to sandwich the mover 31 from above and below.

The valve closing electromagnetic coil 3 of the above embodiments
2 and the valve-opening electromagnetic coil 33, the valve-closing electromagnetic coil 32 and the valve-opening electromagnetic coil 33 may always be used together to perform the opening / closing operation.
When it is necessary and sufficient, the electromagnetic coils 32, 33
Since the use of the electromagnetic coils wastes power, it is preferable to switch whether or not to use the electromagnetic coils 32 and 33 in accordance with the operating conditions.

FIG. 11 is a block diagram showing a control unit for determining whether or not the electromagnetic coils 32 and 33 are used together. The control unit having a microcomputer for controlling the variable valve mechanism is provided in the control unit. A control function corresponding to each block shown in the block diagram is set in advance as a program.

The cooling water temperature Tw and the threshold value of the engine are input to the water temperature discriminating section 101. When the cooling water temperature Tw is lower than the threshold value and the friction is large, and the combined use of the electromagnetic coil is desired, the output signal is output. And outputs “0” as an output signal when the cooling water temperature Tw exceeds the threshold value and the combined use of the electromagnetic coils is not required from the temperature condition.

Note that the cooling water temperature Tw is used as a parameter representing the engine temperature, and the above-described determination determines whether or not the engine temperature is equal to or lower than a predetermined temperature.

The output signal of the water temperature determining unit 101 is
The signal is input to the input terminal (0) of the switching unit 102, and “1” is always input to the other input terminal (1) of the first switching unit 102.

The selection of the input terminal in the first switching section 102 is performed based on the output signal of the second switching section 103. When the output signal of the second switching section 103 is "1", the first switching section 102 performs the first switching. When the input terminal (1) is selected in the unit 102 and the output signal of the second switching unit 103 is “0”, the input terminal (0) is selected in the first switching unit 102.

The input terminal (0) of the second switching unit 103 always receives “0”, and the other input terminal (1) receives the output of the vehicle speed determination unit 104. A vehicle speed and a threshold value of the vehicle speed are input to the vehicle speed determination unit 104, and the vehicle speed is equal to or higher than the threshold value, and a condition that the opening / closing operation that is more reliable and faster than the power consumption and sound vibration performance can be prioritized. , The output signal “1” is output, and when the vehicle speed is lower than the threshold value, the output signal “0” is output.

Further, the selection of the input terminal in the second switching section 103 is performed based on the output signal of the load / rotation determination section 105. The engine rotation speed and the target intake air amount are input to the load / rotation determination unit 105,
With reference to a map in which "1" or "0" is stored in advance for each operation region divided by the engine speed and the target intake air amount, a signal corresponding to the engine speed and the target intake air amount at that time is obtained. , The second switching unit 103
As an input terminal selection signal.

When the output from the load / rotation judging section 105 is "1", the second switching section 10
3 input terminal (1) is selected and the load / rotation determination unit 10
When the output from 5 is “0”, the input terminal (0) of the second switching unit 103 is selected.

The target intake air amount is, for example, a target value for controlling the cylinder intake air amount by advancing the closing timing of the intake valve, and is a parameter representing the engine load. In the above map, “0” is stored for, for example, a low-load / low-rotation range, etc., in which it is desired to improve fuel efficiency while suppressing power consumption and improve sound vibration performance.
“1” is stored in an area where a reliable and quick opening / closing operation is desired to be performed by using the combination 33.

The output signal of the first switching unit 102 is input to an electromagnetic coil operation switching unit 106, and when the output signal of the first switching unit 102 is "1", an electromagnetic coil is used to use the electromagnetic coil together. A control signal is output to the operation circuit of (1), and when the output signal of the first switching unit 102 is “0”, the operation of the electromagnetic coil is stopped.

In the above configuration, the second switching unit 1
In a state where “1” indicating the request for the combined use of the electromagnetic coil is not output from 03, the input terminal (0) is selected by the first switching unit 102, so that the combined use of the electromagnetic coil is performed according to the request from the water temperature determination unit 101. When the friction is large at low temperatures, the valve body 1 is reliably operated by using the electromagnetic coil even when the combination of the electromagnetic coil is not required due to the engine load, the engine rotation, and the vehicle speed. be able to.

On the other hand, in the state where the combined use of the electromagnetic coil is required from the engine load and the engine rotation, the input terminal (1) is selected by the second switching section 103, and the vehicle speed condition is such that the combined use of the electromagnetic coil is permitted. When the voltage is equal to or more than a certain threshold, the output of the second switching unit 103 becomes “1”. When the combined use of the electromagnetic coil is not required from the engine load / engine rotation, the second
The input terminal (0) is selected by the switching unit 103, and the output of the second switching unit 103 becomes “0”.

That is, the output of the second switching section 103 is set to "1" only when the combined use of the electromagnetic coil is required from the engine load / engine rotation and the vehicle speed is equal to or higher than the threshold value. If the output of the second switching unit 103 is "1", the input terminal (1) is selected by the first switching unit 102, and the electromagnetic coil operation switching unit 106 is requested to use the electromagnetic coil together. Is output.

As described above, when the cooling water temperature Tw is equal to or lower than the threshold value, or when the engine load / rotation is in the required range and the vehicle speed is equal to or higher than the threshold value, the electromagnetic coil is activated. Be composed.

The flowchart of FIG. 12 shows the flow of processing in the control block diagram shown in FIG. In step S1, an engine coolant temperature Tw detected by a water temperature sensor not shown is read, and in step S2, a threshold value of the engine coolant temperature Tw stored in a memory in the control unit in advance is read.

In step S3, the current cooling water temperature Tw
Is determined to be equal to or less than the threshold value, and if the current cooling water temperature Tw is equal to or less than the threshold value, the process proceeds to step S11 to open and close the valve body 1 using the electromagnetic coil.

On the other hand, if the current cooling water temperature Tw exceeds the threshold value, the process proceeds to step S4, where the engine rotation speed calculated based on a detection signal from a rotation sensor not shown is read.

In step S5, a target intake air amount for controlling the intake air amount based on the closing timing of the intake valve is read. The target intake air amount reads a result separately calculated based on the accelerator opening, the engine rotation speed, and the like.

In step S6, a map in which whether or not an electromagnetic coil is used in combination for each operating region divided by the engine speed and the target intake air amount (engine load) is referred to.

Then, in a step S7, it is determined whether or not the map reference result indicates a combined use request area of the electromagnetic coil. If it is determined in step S7 that the area is the combined use request area of the electromagnetic coil, the process proceeds to step S8, in which the vehicle speed detected by a vehicle speed sensor (not shown) is read. In step S9, the vehicle speed stored in the memory in the control unit in advance Read the threshold of

In step S10, it is determined whether or not the vehicle speed is equal to or higher than the threshold value, thereby determining whether or not the condition is satisfied by using the electromagnetic coil. When the vehicle speed is equal to or higher than the threshold value, When the engine load / rotation is in the combined use request region and the vehicle speed is equal to or higher than the threshold value, the process proceeds to step S11, and the opening / closing drive of the valve body 1 using the electromagnetic coils 32 and 33 is performed.

On the other hand, when it is determined in step S7 that the combined use is not required from the engine load and rotation, and when it is determined in step S10 that the vehicle speed is lower than the threshold value, the process proceeds to step S12, where the electromagnetic coil 32,3
3, the opening / closing drive of the valve element 1 is performed by the motor 12 alone.

In the above-described embodiment, the motor 12 is used as an actuator for driving the rotary disk 13 which is a rotary motion part. However, a configuration in which the motor 12 is driven to rotate by hydraulic pressure or pneumatic pressure may be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment, (A) is a front view, (B) is a side view, and (C) is a top view.

FIG. 2 is a diagram showing a reaction force characteristic of a spring in the embodiment.

3A and 3B are diagrams showing a second embodiment, wherein FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a top view.

FIGS. 4A and 4B are diagrams showing a third embodiment, wherein FIG. 4A is a front view, FIG. 4B is a side view, and FIG.

FIGS. 5A and 5B are state diagrams showing an opening / closing operation in the third embodiment, wherein FIG. 5A is a closed state diagram, FIG.
(C) is an open state diagram.

FIGS. 6A and 6B are views showing a fourth embodiment, wherein FIG. 6A is a front view, FIG. 6B is a side view, and FIG.

FIGS. 7A and 7B are diagrams showing a fifth embodiment, in which FIG. 7A is a front view, FIG. 7B is a side view, and FIG.

FIG. 8 is a state diagram showing characteristics of a conversion mechanism according to a fifth embodiment.

9A and 9B are diagrams showing a sixth embodiment, wherein FIG. 9A is a front view, FIG. 9B is a side view, and FIG. 9C is a top view.

FIGS. 10A and 10B are views showing a seventh embodiment, wherein FIG. 10A is a front view, FIG. 10B is a closed side view, FIG. 10C is a top view, and FIG.
Is an intermediate opening state side view, and (E) is an opening state side view.

FIG. 11 is a control block diagram of an electromagnetic coil in the embodiment.

FIG. 12 is a flowchart illustrating control of an electromagnetic coil according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Head part 3 ... Valve stem 6, 11 ... Coil spring (elastic body) 8 ... Valve stem for opening / closing drive 12 ... Motor (actuator) 13 ... Rotating disk 14 ... Pin 15 ... Link member 16 ... Connection Rod 31: mover 32, 33: electromagnetic coil 51: elongated hole 52: box-shaped member

Continued on the front page F term (reference) 3G092 DA01 DA02 DA05 DA07 DG02 DG03 DG05 DG06 DG08 DG09 EA08 EA11 EA13 EA25 EA27 EC09 FA11 FA13 FA14 FA24 FA32 GA01 GA10 HA01Z HE01Z HE06Z HE08Z HF08Z HF21Z

Claims (14)

[Claims] 1. An elastic body for urging an intake / exhaust valve to a neutral position, a conversion mechanism for converting a reciprocating linear motion of the intake / exhaust valve along an opening / closing direction into a rotary motion, A variable valve train for an engine, comprising: an actuator for providing a driving force. 2. The conversion mechanism according to claim 1, wherein one end of the conversion mechanism is eccentrically connected to the rotating portion and the other end is formed of a link connected to a valve stem of the intake / exhaust valve. The variable valve train of the engine according to the above. 3. A long hole which is provided integrally with the intake / exhaust valve and which is long in a direction perpendicular to the axis of the intake / exhaust valve, and wherein the conversion mechanism is provided eccentrically on the rotary motion portion. A rotator to be inserted therein, wherein the rotator is configured to revolve around the rotation axis of the rotating portion while reciprocating in the longitudinal direction in the elongated hole. The variable valve train of the engine according to the above. 4. The variable valve operating device for an engine according to claim 1, further comprising a lock mechanism for fixing the rotating portion. 5. The variable valve operating system for an engine according to claim 4, wherein said lock mechanism is a brake mechanism for braking said rotary motion part. 6. The variable valve operating system for an engine according to claim 4, wherein the intake / exhaust valve is fixed to a fully open or fully closed position by the lock mechanism when the engine is stopped. 7. The device according to claim 1, wherein the conversion mechanism is provided on both sides of the valve stem.
The variable valve train of the engine according to any one of the first to third aspects. 8. A valve opening electromagnetic coil for driving the intake / exhaust valve in the valve opening direction by electromagnetic force, and a valve closing electromagnetic coil for driving the intake / exhaust valve in the valve closing direction by electromagnetic force. The variable valve train for an engine according to any one of claims 1 to 7, wherein: 9. The intake / close valve electromagnetic coil according to claim 9,
9. The variable valve actuation device for an engine according to claim 8, wherein the exhaust valve is driven to the vicinity of the fully closed / fully opened state, and the fully closed / fully opened state is maintained by the actuator. 10. The intake / exhaust valve is driven to near full-close / full-open by the open / close electromagnetic coil and the actuator, and the full-close / full-open state is maintained only by the actuator. The variable valve train for an engine according to claim 8, wherein 11. An open / close drive of the intake / exhaust valve only by the actuator or an open / close drive of the intake / exhaust valve by the electromagnetic coil for opening / closing and the actuator is selected according to operating conditions. The variable valve train for an engine according to any one of claims 8 to 10, wherein: 12. The variable valve operating device for an engine according to claim 11, wherein the selection is made based on the temperature of the engine. 13. The variable valve operating system for an engine according to claim 11, wherein the selection is made based on at least one of an engine load and an engine rotation speed. 14. The variable valve operating system for an engine according to claim 11, wherein said selection is made based on a vehicle speed.