JPS614835A - Throttle valve regulating mechanism - Google Patents

Abstract

PURPOSE:To reset a throttle valve smoothly and automatically to the closing position through a spring mechanism upon power interruption to a motor by providing a brushless motor comprised of a field magnet and a stator armature while coupling directly to the shaft for supporting the throttle valve. CONSTITUTION:A disc-type throttle valve 3 is fixed rotatably through a rotary shaft 4 in an airflow path 2 formed in the throttle body 1 and the opening is regulated through a valve drive mechanism 6. The valve drive mechanism 6 is cimprised of a magnetic stator yoke 11 secured to the sideface section 1b of the throttle body 1 and a stator armature 12 symmetrically arranged in 180 deg. symmetry with two flat armature coils 9-1, 9-2 secured to the stator yoke 11 face. Furthermore, a field magnet 13 comprised of N and S pole field magnet segments 13-1, 13-2 while secured to an annular yoke 1 fixed at the end of the rotary shaft 4 is provided while facing with the stator armature 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve adjustment mechanism that adjusts the opening degree of a throttle valve of an internal combustion engine such as an automobile, and particularly relates to a throttle valve adjustment mechanism that electrically adjusts the throttle valve opening degree. This invention relates to a valve adjustment mechanism.

Throttle valve adjustment mechanisms G and L that electrically adjust the throttle valve opening degree can be adjusted not only in response to the amount of depression of the accelerator pedal but also in response to various factors such as engine driving conditions, and has a wide range of applications. .

[Prior art]

As a conventional throttle valve adjustment mechanism, for example,
There is one disclosed in Japanese Patent No. 8-13135. this is,
The throttle valve is provided with an opening/closing lever, the opening/closing lever and the motor are connected via a reduction gear, and a return spring is provided to bias the throttle valve in the closing direction.The throttle valve is driven to open/close by the rotation of the motor. It is something to do. However, in this example, if a failure or the like occurs and the power to the motor is cut off, the motor will maintain its position. Therefore, even if an attempt is made to return the throttle valve to the closed position by biasing the return spring, the motor becomes a load. In addition, since the motor is connected to the opening/closing lever via a reduction gear, this reduction gear further places a load on the return spring. Therefore, in this conventional example, there is a problem that the throttle valve is fixed in an open state when the power to the motor is cut off.

[Problem of the present invention]

When power to the motor is cut off, it is preferable to close the throttle valve immediately. Therefore, an object of the present invention is to automatically return the throttle valve to the closed position when the power to the motor is cut off.

[Means and actions taken to solve the problem] In order to solve the above problem, in the present invention, the shaft that rotatably supports the throttle valve is provided with an N.

A 2P (P is an integer of 1 or more) pole field magnet 1- having S magnetic poles is disposed, and one or more armature coil groups are arranged at the position of the Scot 1-le main body facing the field magnet. A motor is constructed by fixing a stake armature, and
It includes a spring mechanism that biases the throttle valve in the closing direction.

According to this, the motor can be directly connected to the shaft supporting the throttle valve and can be configured as -C. Therefore, a reduction gear is not required, and the load upon return of the throttle valve can be reduced. Furthermore, since the motor is a so-called brushless motor that is composed of a field magnet and a stator armature, the static torque of the motor is extremely small, and since it does not have brushes, no sliding resistance occurs. Therefore,
According to the present invention, when power to the motor is cut off,
The throttle valve can automatically return to the closed position by the biasing force of the spring mechanism.

In addition, if the field magnet is fixed and the rotor is a flat coil, the motor will constitute a so-called coreless motor, so the moment of inertia of the rotor can be further reduced, making it easier for the throttle valve to return to the closed position. It can also be done more smoothly and quickly.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of a throttle valve adjusting mechanism according to the present invention having a partially exploded part and a notch, and will be described with reference to FIG.

A cylindrical air flow passage 2 is formed in the front face of the throttle body 1 and passes through the throttle body 1 . A disk-shaped throttle valve 3 suitable for closing the air flow path 2 is rotatably supported within the air flow path 2 by a rotating shaft 4 . Normally, the light 3 is controlled by a spring mechanism 5 to close the air flow passage 2 at right angles to the central axis of the air flow passage 2, and the valve drive mechanism 6, which will be described later, rotates around the rotation axis 4. This narrows the air flow path 2 and adjusts the flow rate of air passing through it. In addition, the rotating shaft 4, the valve 3,
It is fixed at a position on the division center line by a fixing member 16 so that it can rotate together with the valve 3. Both ends of the rotating shaft 4 are rotatably supported by bearings (not shown) provided on the throttle body 1, and one end extension of the rotating shaft 4 is fixed to one side surface 1a of the throttle body 1. It is connected to a rotating shaft (not shown) of a valve opening detection means (valve opening detection device) 7. Note that the rotating shaft 4 and the rotating shaft of the valve opening detection device 7 may be shared. As the valve opening detection device 7, a suitable device such as a potentiometer, a tacho generator, or an encoder may be selected. The valve opening degree detection device 7 outputs a signal corresponding to the amount of rotation (valve opening degree) of the valve 3 from a lead wire 8, and outputs a signal corresponding to the amount of rotation (valve opening degree) of the valve 3 to a valve drive mechanism 6 whose output signal will be described later.
Adjust and control the energization control claw. The other end of the rotating shaft 4 is formed as an extension and is shared with the rotating shaft of the valve drive mechanism 6. A stator yoke 11 made of a magnetic material is fixed to the other side surface portion 1b of the SCOT 1-HEL main body. The surface of the stator yoke 11 is insulated, and in this case, it is very convenient to form a printed wiring pattern by etching or the like to form an iron substrate.

At the stake yoke 11 surface position on the other side surface lb, there is a stake armature 12. Extended rotation axis4. Field magnet 13. A valve drive mechanism 6 consisting of a rotor yoke 14 and a connecting member 15 is fixedly provided. Two air-core flan L armature coils are arranged 180 degrees symmetrically on the stator yoke 11 so that they do not overlap each other! If-1,
A stator armature 12 consisting of 9-2 is fixedly installed.

Air-core armature coil 9-1, ! 3-2 is formed of a fan-shaped coil made by winding a conductive wire in many turns, but it may also be a printed coil formed by etching a conductive foil, and does not need to be shaped like a fan-shaped frame. However, ideally, the armature: J coils 9'-1, 9-2 should have one magnetic pole 13-1 or 13 of the field magnet 13, which will be described later, so that the opening angle between the conductor parts 9a and 9b that contributes to the generated torque is -2 width (e.g. 9
It is best to form it into a fan frame shape with the same or approximately the same width as (0 degrees). The circumferential conductor portions 9c and 9d of the armature coil 9-1, 9-2 are conductor portions that do not contribute to the generated torque. The armature coils 9-1 and 9-2 are air-core type in order to reduce costs, but even if there are some disadvantages in terms of cogging, steel wire, responsiveness, etc., they can handle large rotations depending on the design specifications. If it is necessary to obtain torque, use the internal or external G, 1 of armature coil 9-1, 9-2.
An iron core may be provided in the section. In addition, armature coil 9-1.
When installing an iron core inside the '9-2, the opening angle of the iron core is equal to the above opening angle of the armature coils 9-1 and 9-2. It is desirable that the width be the same or approximately equal to the width of one magnetic pole 13-1 and 13-2 of the magnet 13. At the tip of the other end of the rotating shaft 4,
An annular rotor yoke 14 is fixed by a connecting member 15, and the rotor yoke 14 has N-pole and S-pole field magnet segments 13 whose magnetization width is about 90 degrees.
A magnetizing magnet 13 consisting of -1.13-2 is fixedly installed, and the field magnet 13 is connected to the armature coil 9-1.9-2.
The stator armature 12 is configured to rotate relative to the stator armature 12. Generally a two-pole field magnet 1
In a brushless morph having a stator armature 12 consisting of 3 and 2 armature coils 9-1 and 9-2, it is normal to use at least one magneto-electric transducer; is expensive, requires very strict positioning accuracy, is not suitable for mass production, and is significantly affected by temperature changes, making it difficult to apply to the mechanism of the present invention, and it is difficult to apply it to the mechanism of the present invention. A method using the back electromotive force of a coil, for example, armature coil 9-1, 9-2, can be considered, but this method cannot be started automatically and requires another self-start processing device. is generally not determined, so the stator armature 12 consists of a two-pole field magnet 13 and two armature coils 9-"1.9-2.
In the case of the brushless morph, it is difficult to rotate the valve 3 in a predetermined direction using the back electromotive force, so it is difficult to apply it to the present invention. j: , there is j. On the other hand, in the case of the present invention, there is no need for a rotational position detection device such as a magnetoelectric conversion element.
Moreover, it can be started automatically without using the induced output of a coil placed in a magnetic field. In order to enable self-starting in this way, armature coil 9-1.9-2
The armature coil 9
-1.9-2, the field magnet 13 (field magnet segment 13- 1.13-2) and stator armature 12
(armature coils 9-1, 9-2) must be provided. In the state shown in FIG. 2, the conductor portion 9a that contributes to the generated torque on one side of the armature coil 9-1.9-2 does not face the field magnet segment 13-1.13-2, so the conductor portion Rotational torque cannot be obtained depending on 9a,
The other conductor portion 9b that contributes to the generated torque faces the field magnet segment 13-1.11-2, so when a current is passed through the armature coil 9-1.9-2 as shown by the arrow, the arrow Rotational torque in the F direction is obtained, and the field magnet 13 rotates in the arrow F direction.

Next, FIG. 3 shows a circuit for controlling the throttle valve adjusting mechanism of the present invention. This will be explained with reference to FIG.

This circuit receives signals from a valve opening indicating means (valve opening detecting circuit) 102 that generates a signal corresponding to the instructed throttle valve opening, and a valve opening detecting device 7 that detects the current valve opening. , and a differential amplifier 101a to obtain a differential signal. This signal is input to the driver circuit 101b, and the motor 1
03 to drive the throttle valve to the indicated position.

Here, the differential amplifier 101a and the driver circuit 101
b constitutes energization control means (energization control circuit) 101.

As is clear from the above, when the valve 5 closes the air flow path 2 by the spring mechanism, air is not introduced, but a signal from the throttle valve opening instruction circuit 102 to introduce an appropriate amount of air is provided. is the energization control circuit 10'I
When the armature coil 9. is input to the armature coil 9. -1.9-2 When the energization is controlled, rotational torque is generated, and the field magnet 13 rotates appropriately against the spring mechanism 5, so the valve 3 directed by the rotating shaft 4 turns an appropriate amount, and air circulation In order to open the passage 2 by an appropriate amount, the air flow rate is controlled by the air passage 2 and the valve 3. In addition, as the rotating shaft 4 rotates, the valve opening detection device 7 detects the valve 3.
A signal corresponding to the valve opening of the valve 3 is fed back to the energization control circuit 101 to adjust the valve opening of the valve 3. When closing the air flow passage 2 after an appropriate amount of air has been introduced, the energization control circuit 101 Child coil '11.9-2
When the current is turned off, the valve 3 is rotated by the return force of the spring mechanism 5, and the air flow passage 2 can be closed by the valve 3.

In the above example, the armature coils 9-1, 9-2 are arranged at equal intervals, but they do not need to be arranged at equal intervals as long as the purpose can be achieved, and in the above example, the field Although the field magnet is formed by magnet segments, it goes without saying that the present invention is not limited to this, and an annular integrated field magnet may be used. Also, in the above example, N.

A two-pole field magnet with S magnetic poles was used, but 2P
(P is a positive integer of 2 or more) poles may be used, and the stator armature may be constructed using n (n is an integer of 1 or more excluding 2) armature coils. Needless to say.

〔Effect of the invention〕

According to the present invention, since the motor is a brushless morph composed of a field magnet and a stator electric machine r, and the motor is directly connected to the shaft supporting the throttle valve, when the power to the motor is cut off, The motor is almost in a no-load state. Therefore, the throttle valve can be returned to the closed position by the biasing force of the spring mechanism.

Furthermore, the motor of the present invention is a brushless morph,
Since rotational position detection devices such as magneto-electric conversion elements are not required,
The structure of the motor is extremely simple, and it can be made into a motor with i) 1" durability.

In addition, in order to reduce the load on the motor itself when the power to the motor is cut off, it is possible to use an AC motor such as a synchronous motor or an induction motor, but in this case, the torque (M Therefore, the motor becomes larger, which increases the cost and requires a large installation space.Furthermore, in the case of an AC motor, an AC generator is required as the energization control circuit, and the control circuit power is <?5i wholesale. .

[Brief explanation of drawings]

Fig. 1 is a partially exploded and partially cutaway perspective view showing an embodiment of the present invention, Fig. 2 is a developed view of a field magnet and a stator armature, and Fig. 3 is a throttle valve of the present invention. FIG. 3 is a block diagram showing the electrical circuit of the adjustment mechanism.

Claims (4)

[Claims] (1) a throttle body, a throttle valve rotatably supported on the throttle body by a shaft, a spring mechanism that biases the throttle valve in the closing direction, a motor that drives the throttle valve in the opening direction, and the A valve opening detecting means for detecting a valve opening of a throttle valve, a valve opening indicating means supporting the valve opening of the throttle valve, a signal of the valve opening detecting means and a signal of the valve opening indicating means. and a energization control means for instructing energization of the motor by means of a 2P (P is an integer of 1 or more) pole field having N and S magnetic poles, in which the motor is disposed on the shaft. A throttle valve adjustment mechanism comprising a magnet and a stator armature consisting of one or more armature coil groups fixedly installed at a position of the throttle body facing the field magnet. (2) The stator armature is arranged so that two or more armature coils do not overlap.
Throttle valve adjustment mechanism described in Section 3. (3) Claims (1) or (2), wherein the armature coil is an air-core coil formed flat.
Throttle valve adjustment mechanism described in Section 3. (4) The throttle according to claim (3), wherein the armature coil is an air-core coil whose opening angle of the conductor portion contributing to the generated torque is the same or approximately the same width as the magnetic pole of the field magnet. Valve adjustment mechanism.