JPH04362236A - Actuator - Google Patents

Abstract

PURPOSE:To facilitate correct rotation control for a rotor in an actuator, and set the size of the actuator compact. CONSTITUTION:An actuator 8 is composed of the first magnet 15 comprising two poles installed to a rotor 13, the second magnet 16 comprising two poles disposed in parallel to the first magnet 15 for forming magnetic poles at deflected positions to the magnetic poles of the first magnet 1 5, stator side fixed magnets 29a, 29b disposed to face the first magnet 15, and stator side excitation coils 25a, 25b disposed in parallel to the fixed magnets 19a, 19b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator, and more particularly to an actuator that controls the opening and closing of a valve.

0002

2. Description of the Related Art Conventionally, for example, by providing an intake control valve separately from an intake valve for each cylinder of an internal combustion engine,
It has been considered to prevent backflow of intake air in the intake pipe of an internal combustion engine. In other words, at the beginning of the intake stroke of an internal combustion engine,
Due to valve overlap, burned gas in the cylinder and exhaust pipe flows back toward the intake pipe. Therefore, the filling efficiency of intake air into each cylinder may decrease, so it is necessary to control the opening and closing of the intake control valve to prevent backflow of intake air, improve the filling efficiency of intake air, and increase the output of the internal combustion engine. is considered.

An actuator for controlling the opening and closing of this intake control valve is shown in FIGS. 11 and 12. This actuator 40
is attached and fixed to the lower surface of the intake pipe 41. Then, as the rotor 42 of the actuator 40 rotates,
The rotating shaft 43 and the intake control valve 44 rotate to open or close the intake pipe 41. or,
In order to rotate the rotor 42 of the actuator 40, a two-phase four-pole excitation coil 46a is provided in the casing 45.
46d to magnetize the magnetic pole pieces 47a to 47d around which the excitation coils 46a to 46d are wound. Then,
A magnet 48 fixed to the rotor 42 is connected to each magnetic pole piece 47a to 4.
The rotating shaft 43 of the rotor 42 is rotated by being attracted or repelled by the magnetic force 7d.

0004

However, when the excitation coils 46a to 46d are wound around each of the magnetic pole pieces 47a to 47d, the excitation coils 46a to 46d that are adjacent to each other are
Since the excitation coils 46a to 46d interfere with each other, as shown in FIG. 12, it is necessary to wind the excitation coils 46a to 46d adjacent to each other so as not to interfere with each other. Therefore, not only is there a wasted space inside the casing 45, but also the casing 4
There is a problem in that the actuator 5 becomes large in size, which in turn leads to an increase in the size of the actuator 40.

[0005]Furthermore, in recent years, in order to obtain high output even in the high speed rotation range of the engine, a plurality of intake pipes 41 are provided for each cylinder. As a result, the intake pipe 41 that communicates with each cylinder
are arranged horizontally in parallel in the engine room, and the engine room becomes overcrowded in the horizontal direction. Therefore, when the above-described actuator 40 is attached to each intake pipe 41,
Casings 45 of actuators 40 adjacent to each other will interfere with each other. As a result, there is a problem in that it becomes impossible to attach the actuator 40 to each intake pipe 41.

Furthermore, since the actuator 40 described above is a two-phase, four-pole type, in order to control the rotation of the rotor 42, current must be passed through each of the four-pole excitation coils 46a to 46d, making excitation control complicated. Therefore, there is a problem that accurate rotation control of the rotor 42 becomes difficult. The present invention has been made to solve the above-mentioned problems, and its purpose is to simplify the excitation control of the excitation coil to facilitate the rotation control of the rotor, and to reduce the size of the rotor, thereby increasing the number of intakes. An object of the present invention is to provide an actuator that can be easily attached to a pipe without interfering with each other.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a first magnet consisting of two poles attached to a rotor constituting an actuator, and a first magnet also attached to the rotor. a second magnet consisting of two poles arranged in parallel with the first magnet; fixed magnets on the stator side arranged to face each other; and an excitation coil arranged in parallel to the fixed magnets and arranged on the stator side forming the actuator to face a second magnet. Its gist is to consist of:

[0008]

[Operation] Since the second magnet is arranged in parallel to the first magnet attached to the rotor, the fixed magnet faces the first magnet and the excitation coil faces the second magnet. can be prevented from interfering with each other. Further, the rotation of the rotor can be controlled by exciting only the excitation coil facing the second magnet.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which actuators are provided in the intake pipes of a four-cylinder, 16-valve engine will be described below with reference to FIGS. 1 to 9. As shown in FIG. 10, intake pipes 3a and 3b are provided on the intake side of the cylinders 2a to 2d constituting the four-cylinder engine 1, and communicate with the cylinders 2a to 2d, respectively. On the exhaust side of the cylinders 2a to 2d, there are exhaust pipes 4a, which communicate with the cylinders 2a to 2d, respectively.
4b is provided. Furthermore, intake valves 5a and 5b that are opened and closed by high-speed compatible cams (not shown) are provided on the intake side of each of the cylinders 2a-2d, and high-speed compatible cams (not shown) are provided on the exhaust side of each of the cylinders 2a-2d. Exhaust valves 6a and 6b are provided which are opened and closed by.

Further, intake control valves 7 are rotatably provided in the intake pipes 3a and 3b, and the opening and closing of the intake control valves 7 are controlled by respective actuators 8. Here, the intake control valve 7 is controlled by a control device (EC) so that the valve overlap period substantially decreases as the rotational speed decreases, independently of the opening and closing of the intake valves 5a and 5b.
U) It is driven to open and close by the control of 9. That is, when the engine 1 using the high-speed compatible cam is operated at a rotational speed higher than the reference rotational speed at which the maximum torque can be output, the intake control valve 7 is closed for approximately the same period as the opening period of the intake valves 5a and 5b. or keep the valve open for the entire period.

On the other hand, when the engine is operating at a rotational speed lower than the reference rotational speed, the intake control valve 7 is opened and closed so that a predetermined valve overlap period is shortened in accordance with the rotational speed. Control takes place. Next, the configuration of the actuator 8 that controls the opening and closing of the intake control valve 7 provided in each intake pipe 3a, 3b will be described. Note that since the actuators 8 provided in each intake pipe 3a, 3b all have the same configuration, only one actuator 8 will be explained.

As shown in FIG. 1, a casing 10 constituting an actuator 8 and having a rectangular shape in plan view and having an open top is fastened to the lower part of the intake pipe 3a with bolts 12 through a lid 11. As shown in FIG. A rotor 13 is provided within the casing 10. This rotor 13 is composed of a rotating shaft 14 and a pair of first and second magnets 15 and 16. The lower end of the rotating shaft 14 of the rotor 13 is rotatably supported by a bearing 17 provided in the casing 10.

The upper part of the rotating shaft 14 is inserted through the intake pipe 3a through the lid 11, and is rotatably supported by a pair of bearings 18 provided above and below the intake pipe 3a. A rotating shaft 14 inserted into the intake pipe 3a
The intake control valve 7 is rotatably fixed to the intake control valve 7. Further, as shown in FIG. 2, a circular recess 7a is provided inside the intake pipe 3a so that the intake control valve 7 can rotate.

As shown in FIG. 5, a pair of first and second magnets 15 and 16 arranged in parallel on the rotating shaft 14 have N and S magnets.
It is composed of two poles. Then, the intake control valve 7 is perpendicular to the intake pipe 3a (intake pipe 3a).
a), the N pole of the first magnet 15 is at a position rotated 45 degrees clockwise with respect to a fixed magnet 29b, which will be described later, and the S pole is located at a position rotated 45 degrees clockwise with respect to a fixed magnet 29a, which will be described later. The first magnet 15 is positioned at the rotated position, and the two poles of the first magnet 15 are diagonally 45 degrees to the left.
is attached to the rotating shaft 14. On the other hand, the N pole of the second magnet is 44 degrees counterclockwise with respect to the magnetic pole piece 22b, which will be described later.
The second magnet 16 is aligned with the rotation axis 14 such that the S pole is located at a location rotated by 5 degrees and the S pole is located at a location rotated by 45 degrees counterclockwise, and the two poles of the second magnet 16 are located at an angle of 45 degrees to the right. It is attached to. Therefore, the second magnet 16 is provided on the rotating shaft 14 so that the N pole of the second magnet 16 is rotated by 90 degrees with respect to the N pole of the first magnet 15 .

Further, as shown in FIGS. 1 and 8, a spacer 20 having a U-shape in plan is disposed at the bottom of the casing 10 with a base 19 interposed therebetween. The spacer 20
A laminated core 21 is supported on top of the . As shown in FIG. 4, the laminated core 21 is formed in the same U-shape in plan as the spacer 20, and a pair of mutually opposing magnetic pole pieces 22a and 22b are integrally formed inside thereof to protrude. Furthermore, locking steps 23a and 23b are formed at the tips of the magnetic pole pieces 22a and 22b, respectively.

Further, annular resin bobbins 24a, 24b are attached to each of the magnetic pole pieces 22a, 22b, and the bobbins 24a, 24b are held by the locking steps 23a, 23b of the magnetic pole pieces 22a, 22b. They are fitted and fixed so that they do not come off from the magnetic pole pieces 22a and 22b. Further, excitation coils 25a and 25b are wound around the bobbins 24a and 24b, respectively, and by exciting the excitation coils 25a and 25b, the magnetic pole pieces 22a and 22b are magnetized.

The magnetic pole pieces 22a, 22b are magnetized into two different N and S poles by excitation of the excitation coils 25a, 25b. Further, in this embodiment, when the excitation coils 25a and 25b are excited by starting the engine 1, the tip of the magnetic pole piece 22a is magnetized to the north pole, and the tip of the magnetic pole piece 22b is magnetized to the south pole. It has become so. Further, the height of the laminated core 21 is adjusted by the spacer 20, and the height of the laminated core 21 is adjusted by the spacer 20, and the height of the laminated core 21 is adjusted by the spacer 20.
, 22b are arranged to face the second magnet 16 of the rotor 13.

Furthermore, as shown in FIGS. 1 and 3, a spacer 26 having the same shape as the spacer 20 is provided above the laminated core 21. A laminated core 27 is supported and fixed on the upper part of the spacer 26. This laminated core 27 is formed into a U-shape in plan, and projecting pieces 28a and 28b that project from each other are integrally formed inside the core. Fixed magnets 29a, 29b are attached to the tip surfaces of the protruding pieces 28a, 28b. Moreover, the protruding piece 28
Support plates 30a, 30b made of resin are attached to both side surfaces of a, 28b and fixed magnets 29a, 29b, respectively.

[0019] As a result, the fixed magnets 29a, 29b
is prevented from moving in the horizontal direction (in the vertical direction in FIG. 3). Further, the height of the laminated core 27 is adjusted by the spacer 26, and the protruding pieces 28a, 28 of the laminated core 27 are adjusted in height.
The fixed magnets 29a and 29b provided on the rotor 1
It is arranged so as to face the first magnet 15 of No. 3. In this embodiment, the fixed magnets 29a and 29b are arranged such that the tip of the fixed magnet 29a is a north pole, and the tip of the fixed magnet 29b is a south pole.

Furthermore, when the engine 1 is stopped, the excitation coils 25a and 25b are demagnetized, so the magnetic pole pieces 22a and 22b are not magnetized. Therefore, the south pole of the first magnet 15 is attracted to the north pole of the fixed magnet 29a, and the north pole of the first magnet 15 is attracted to the south pole of the fixed magnet 29b. As a result, the rotation shaft 14 of the rotor 13 rotates counterclockwise, so that the intake control valve 7 is stopped at an angle of 45 degrees to the left as shown in FIG.

When the engine 1 starts, the ECU 9 excites the excitation coils 25a, 25b, and the magnetic pole pieces 22a, 25b are excited.
22b are magnetized to different magnetic poles. and,
When engine 1 is idling (low speed rotation range),
When the intake valves 5a and 5b are closed, the tip of the magnetic pole piece 22a is magnetized to the north pole, and the tip of the magnetic pole piece 22b is magnetized to the south pole. Therefore, the N pole of the second magnet 16 is the S pole of the magnetic pole piece 22b, and the S pole of the second magnet 16 is the S pole of the magnetic pole piece 22b.
The poles are each attracted to the north pole of the magnetic pole piece 22a. At this time, the magnetic force of the second magnet 16 and the magnetic force of the magnetic pole pieces 22a, 22b generate a torque that rotates the rotating shaft 14 clockwise.

On the other hand, the N pole of the first magnet 15 is connected to the fixed magnet 29.
The S pole of the first magnet 15 is the N pole of the fixed magnet 29a.
They are drawn to each other's poles. At this time, the first magnet 15
Torque that rotates the rotary shaft 14 in the counterclockwise direction is generated by the magnetic force of the fixed magnets 29a and 29b. As a result, the rotational position of the intake control valve 7 is controlled by the balance of these torques having different rotational directions. Therefore, the state in which the intake control valve 7 is perpendicular to the inside of the intake pipe 3a (
It is designed to stop when the intake pipe 3a is closed.

By adjusting the current flowing through the excitation coils 25a, 25b by the ECU 9, the intake control valve 7 controls the intake valves 5a, 5b from when the engine 1 starts until it reaches a high speed rotation range. It is controlled to open later than the opening and to close earlier than the closing of the intake valves 5a and 5b. By adjusting the current flowing through the excitation coils 25a and 25b by the ECU 9, the timing deviation of the intake control valve 7 becomes smaller as the engine 1 approaches a high speed rotation range.

When the engine 1 reaches a high speed rotation range, the ECU 9 causes the current flowing through the excitation coils 25a, 25b to be reversed to that when the intake control valve 7 is closed, thereby exciting the excitation coils 25a, 25b. As shown in FIG. 9, the tip of the magnetic pole piece 22a is magnetized to the S pole, and the tip of the magnetic pole piece 22b is magnetized to the N pole. Therefore, the N pole of the second magnet 16 is attracted to the S pole of the magnetic pole piece 22b, and the S pole of the second magnet 16 is attracted to the N pole of the magnetic pole piece 22a. At this time, the magnetic force of the second magnet 16 and the magnetic force of the magnetic pole pieces 22a, 22b generate a torque that rotates the rotating shaft counterclockwise.

On the other hand, the N pole of the first magnet 15 is connected to the fixed magnet 29.
The S pole of the first magnet 15 is the N pole of the fixed magnet 29a.
They are drawn to each other's poles. At this time, the first magnet 15
Torque that rotates the rotary shaft 14 clockwise is generated by the magnetic force of the fixed magnets 29a and 29b. As a result, due to the balance of the torques having different rotational directions, the rotation axis of the rotor 13 stops as shown in FIG. 9, and the intake control valve 7 in the intake pipe 3a becomes parallel to the intake pipe 3a. It is configured to stop in this state (intake pipe 3a is open).

Next, the operation of the actuator 8 constructed as described above will be explained. First, when the engine 1 is stopped, the excitation coils 25a and 25b of the actuator 8 are demagnetized, so the N and S poles of the first magnet 15 are attracted to the fixed magnets 29a and 29b, and as shown in FIG. As shown in FIG. 2, the intake control valve 7 in the intake pipe 3a is stopped and tilted diagonally 45 degrees to the left.

[0027] Then, when the engine 1 is started, the ECU
9 excites the excitation coils 25a and 25b of the actuator 8, magnetizing the tip of the magnetic pole piece 22a to the north pole and the tip of the magnetic pole piece 22b to the south pole. Then, the S pole of the second magnet 16 is attracted to the N pole of the magnetic pole piece 22a, and the N pole of the second magnet 16 is attracted to the S pole of the magnetic pole piece 22b, so that the rotor 1
A torque is generated to rotate the rotating shaft 14 of No. 3 clockwise, and the rotating shaft 14 rotates clockwise. Therefore, the N pole of the first magnet 15 changes from the S pole of the fixed magnet 29b to the first magnet 1
The S pole of No. 5 is in the direction away from the N pole of the fixed magnet 29a. However, the magnetic force of the first magnet 15 and the fixed magnet 29a
, 29b attract each other, so that the rotating shaft 14
generates a torque that tries to rotate counterclockwise. Thereby, the rotational position of the rotating shaft 14 is controlled by the balance of torques having different rotational directions.

[0028]The intake valves 5a, 5b
When the intake control valve 7 is closed, as shown in FIG.
When the intake pipe 3a is closed and the intake valves 5a and 5b are opened, the intake control valve 7 closes the intake pipe 3a.
The rotation position is controlled to open. Further, the rotational position of the intake control valve 7 is controlled so that the intake pipe 3a is closed before the intake valves 5a and 5b are closed. As the engine 1 approaches a high-speed rotation range, the timing of opening and closing of the intake control valve 7 and the intake valves 5a and 5 are changed.
The timing difference between opening and closing of b is reduced.

Therefore, during the period from when the engine 1 is idling (low speed range) to when it reaches a high speed range, the intake control valve 7 delays the timing of opening the intake pipe 3a (delays the timing of opening the intake pipe 3a) compared to the timing when the intake valves 5a and 5b open. (maintaining the same state), it is possible to prevent backflow of intake air from the cylinders 2a to 2d. Then, when the engine 1 reaches a high speed rotation range, the ECU 9 reverses the current flowing through the excitation coils 25a, 25b of the actuator 8 to the state in which the intake control valve 7 is closed to excite the excitation coils 25a, 25b. As shown in , the tip of the magnetic pole piece 22a is set as the S pole,
The tip of the magnetic pole piece 22b is magnetized to the north pole. Then, the second
The S pole of the magnet 16 is the N pole of the magnetic pole piece 22b, and the second magnet 16
Since the north poles of the magnetic pole pieces 22a are attracted to the south poles of the magnetic pole pieces 22a, a torque is generated that rotates the rotating shaft 14 of the rotor 13 in a counterclockwise direction, causing the rotating shaft 14 to rotate counterclockwise. Therefore, the N pole of the first magnet 15 is the S pole of the fixed magnet 29a.
From the poles, the S pole of the first magnet 15 is separated from the N pole of the fixed magnet 29b, each resisting the mutual attraction force. However, since the magnetic force of the first magnet 15 and the magnetic force of the fixed magnets 29a and 29b attract each other, a torque is generated that tends to rotate the rotating shaft 14 clockwise.

Therefore, the rotating shaft 14 is stopped due to the balance between the torques having different rotational directions, and the intake control valve 7 opens the intake pipe 3a. As a result, in the high speed rotation range of the engine 1, from the intake pipe 3a to each cylinder 2a~
You can smoothly take in air to 2d. Incidentally, if the excitation current flowing through the excitation coils 25a and 25b is reduced, the magnetic force of the magnetic pole pieces 22a and 22b becomes smaller, so that the fixed magnets 29a and 29b attract the N and S poles of the first magnet 15. Therefore, the intake pipe 3a is rotated slightly by rotating the intake control valve 7.
can be rotated in the closing direction.

[0031] Also, the first
, two magnets 15 and 16 are arranged in parallel, respectively, and fixed magnets 29a and 29b are arranged so as to face the first and second magnets 15 and 16, respectively.
Since the magnetic pole pieces 22a and 22b of the laminated core 21 are arranged, the excitation coil 25 attached to the magnetic pole pieces 22a and 22b
a, 25b can be prevented from interfering with the fixed magnets 29a, 29b.

Therefore, the space for arranging the fixed magnets 29a, 29b and the excitation coils 25a, 25b is not wasted and can be used effectively. Also, fixed magnet 2
Since the excitation coils 9a, 29b and the excitation coils 25a, 25b can be arranged vertically, the length of the casing 10 in the width direction can be shortened. As a result, actuator 8
By downsizing the casing 10, the actuator 8 can be downsized. Also, since the length in the width direction of the casing 10 of the actuator 8 can be shortened,
As shown in FIG. 3, even if the intake pipes 3a, 3b are plural and the horizontal direction becomes crowded, the actuator 8 can be easily attached to each intake pipe 3a, 3b.

Furthermore, since the conventional actuator is a two-phase four-pole actuator, the rotation of the intake control valve 7 must be controlled while controlling the excitation current flowing through each excitation coil provided at the four poles, and the excitation current is controlled. Control becomes complicated. However, in this embodiment, the rotation of the intake control valve 7 can be controlled simply by exciting the excitation coils 25a and 25b, so the excitation current can be easily controlled.

In this embodiment, the excitation coil 25
Although the fixed magnets 29a, 29b are arranged above the casing 10, the fixed magnets 29a, 29b can also be arranged below the casing 10, and the excitation coils 25a, 25b can be arranged above the fixed magnets 29a, 29b. Moreover, the first magnet 15 and the second magnet 16
Although the first magnet 15 and the second magnet 16 are provided on the rotating shaft 14 with their N poles shifted by 90 degrees from each other, the angle at which they are shifted from each other can be changed depending on the intended use.

In this embodiment, the actuator 8 is used to control the opening and closing of the intake pipes 3a and 3b of the engine 1, but the use of the actuator 8 is not limited to the above-mentioned purpose, and may also be used to perform angle control. It is also possible to provide it in the device.

[0036]

Effects of the Invention As detailed above, according to the present invention, the excitation control of the excitation coil is simplified to facilitate rotor rotation control. An excellent effect is that they can be easily installed without interfering with each other.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the internal structure of an actuator in an internal combustion engine provided on the lower surface of an intake pipe.

FIG. 2 is a plan view showing a stop position of the intake control valve when the engine is in a stopped state.

FIG. 3 is a partial cross-sectional view showing a support structure for a fixed magnet within a casing of an actuator.

FIG. 4 is a partial cross-sectional view showing a holding structure for an excitation coil within a casing of an actuator.

FIG. 5 is an explanatory diagram illustrating a state in which the intake pipe is closed by rotation of the intake control valve when the engine is idling.

FIG. 6 is a cross-sectional view showing the stop position of the first magnet when the polarity of the magnetic pole piece is reversed.

FIG. 7 is a cross-sectional view showing the stopping position of the second magnet when the polarity of the magnetic pole piece is reversed.

FIG. 8 is a plan view showing the shape of a spacer.

FIG. 9 is an explanatory diagram illustrating a state in which the intake pipe is opened by rotation of the intake control valve in the high-speed rotation range of the engine.

FIG. 10 is a plan view showing a state in which an actuator is attached to each intake pipe of a four-cylinder, 16-valve engine.

FIG. 11 is a longitudinal sectional view showing a conventional actuator.

FIG. 12 is a cross-sectional view showing the internal structure of a conventional actuator.

[Explanation of symbols]

2a to 2d... Cylinder, 3a, 3b... Intake pipe, 7... Intake control valve, 8... Actuator, 13... Rotor, 15... First magnet, 16... Second magnet, 25a, 25b... Excitation coil, 2
9a, 29b...Fixed magnet

Claims (1)

[Claims] Claim 1: A first magnet consisting of two poles attached to a rotor constituting an actuator, a first magnet attached to the rotor,
A magnetic pole is formed that is shifted in position with respect to the magnetic pole of the first magnet, and a second magnet consisting of two poles is arranged in parallel with the first magnet, and is opposed to the first magnet. A fixed magnet on the stator side disposed in the magnet, and an excitation coil on the stator side disposed opposite to the second magnet and in parallel with the fixed magnet. actuator.