JPH0766004B2 - Rotation speed / position converter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotation speed / position conversion device that changes the position of a movable body according to the rotation speed of a rotating body by an electromagnetic force.

2. Description of the Related Art Conventionally, as shown in FIG. 7, a rotation speed / position conversion device of this type is based on the principle of an Arago disk, and is based on the principle of an Arago disk. By applying a magnetic field by a pair of magnets 71, 72 provided in
Between the eddy current generated in the disk 3 and the magnetic field, an electromagnetic force for moving the movable body composed of the yoke 6 and the magnets 71, 72 in the rotation direction of the disk 3 is generated.

The generated electromagnetic force is almost proportional to the rotation speed of the disk 3, and the position of the movable body can be changed according to the rotation speed of the disk 3.

However, in such a conventional rotation speed / position conversion device,
The magnetic circuit that forms the magnetic flux φ becomes long and the magnetic resistance increases, which weakens the magnetic field and weakens the generated electromagnetic force.

Therefore, to obtain a large electromagnetic force, a large magnet 7
1,72 must be provided, which causes a problem that the device becomes large.

The present invention has been made in consideration of the above points, and by devising the installation of the magnet, it is possible to minimize the length of the magnetic circuit and efficiently generate a large electromagnetic force. The present invention provides a rotation speed / position conversion device.

Further, the present invention provides an engine governor device capable of optimally adjusting the speed of the engine by using such a rotation speed / position conversion device.

Configuration Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the rotation speed / position conversion device according to the present invention, as shown in FIGS. 1A and 1B, a plurality of magnets 7 (71, 72, 73, 74) are attached to the holding member 12 in a plate shape. It is attached together with the yokes 61 and 62.

That is, different magnetic poles sandwich the rotating disk 3 made of a non-magnetic material through the air gaps, and different magnetic poles on the same side of the rotating disk 3 are adjacent to each other in the rotating direction of the rotating disk 3. In addition, at least four permanent magnets 71, 72, 73, 74 are arranged on both sides of the rotary disc 3.

Then, the magnets 71, 73 and 72, 74 that are adjacent to each other are attached to the holding member.
The plate-shaped yokes 61 and 62 fixed to the 12th side are mounted on the yokes 61 and 62, respectively.

With such a configuration, as shown by an arrow φ in FIG. 1 (b), two pairs of magnets 71, 72 and 73,
A magnetically closed circuit is formed by the gap 74 and the respective yokes 61, 62 through the air gap.

As each of the magnets 71 to 74, one having a rectangular end surface as shown in FIG. 2 or one having a circular end surface as shown in FIG. 3 is used.

Further, as shown in FIG. 4, each of the magnets 71 to 74 may be formed so that the end surface of the magnets 71 to 74 has an arc shape in conformity with the disk 3.

In the rotation speed / position conversion device according to the present invention configured as described above, the length of the magnetic circuit forming the magnetic flux φ becomes shorter and the magnetic resistance becomes smaller than that of the conventional device shown in FIG. Therefore, the magnetic field acting on the disc 3 is enhanced, and a large electromagnetic force can be obtained.

Therefore, the magnets 71 to 74 can be effectively reduced in size and weight as a whole, as compared with the case where only the pair of magnets 71 and 72 shown in FIG. 7 is provided.

Further, according to the present invention, when the magnets 71 to 74 are separately attached to the plate-shaped yokes 61 and 62 separately provided, a magnetic closed circuit is formed. 62
Any material may be used as the material of the holding member 12 for fixing each of them.

Therefore, the holding member 12 can be formed of synthetic resin or the like, and the weight can be effectively reduced.
In addition, a large degree of freedom in shape can be obtained when forming the holding member 12.

Further, in the present invention, as shown in FIG. 5, at least two pairs of magnets 71, 72 and 73, 74 are arranged such that different poles are adjacent to each other in the radial direction of the disk 3 on the same side of the disk 3. By arranging in parallel with each other, a larger electromagnetic force can be obtained from the distribution state of the magnetic flux.

FIG. 6 shows an example of the configuration of a governor device for an engine using the rotational speed / position conversion device according to the present invention described above.

In the configuration shown in the figure, for example, a disc 3 made of a non-magnetic material such as aluminum is attached around a flywheel 2 attached to a crankshaft 1 of a general-purpose engine, and one end facing the disc 3 is attached. Pivot 4
A swinging arm 5 pivotally supported by is provided.

A holder portion 51 is integrally formed at the tip end portion of the swing arm 5 so that the disk portion 3 is sandwiched in the holder portion 51 via the yokes 61 and 62 from above and below, respectively. Each pair of magnets 71, 7 so that the opposite poles face each other.
2 and 73,74 are installed.

As shown by the arrow φ in FIG. 1 (b), the yokes 61, 6 are
The 2 and the magnets 71, 72, 73, 74 form a magnetic closed circuit through the air gap.

In addition, the swing arm 5 has a flywheel 2
A spring 8 is mounted between the fixed side and the fixed side so as to suppress swinging in the rotation direction indicated by arrow A in the figure.

Further, between the swing arm 5 and the shaft 111 of the throttle valve 11 of the engine, a link 9 and a drive lever 10 for driving the throttle valve 11 in the opening and closing directions according to the movement of the swing arm 5. Is provided.

In the engine governor device configured in this manner, when the flywheel 2 rotates in the direction of arrow A in the figure in synchronization with the rotation of the engine, the eddy current generated in the disk 3 by the magnets 71 to 74 and the magnets 71 to 74 are generated. An electromagnetic force F that causes the swing arm 5 to swing in the rotation direction of the flywheel 2 with the magnetic field created by
Occurs. The magnitude of the generated electromagnetic force F is almost proportional to the rotation speed of the flywheel 2, that is, the engine rotation speed.

Therefore, if the tension force of the spring 8 is set so that the electromagnetic force F acting on the swing arm 5 and the tension force of the spring 8 become equal when the engine rotation speed is the set rotation speed, Is maintained at the set number of revolutions, the swing arm 5 does not swing at all and stands still at a fixed position, and the throttle valve of the engine is held at a predetermined opening position.

When the engine speed increases above the set speed as the load decreases, the electromagnetic force F acting on the swing arm 5 overcomes the tensile force of the spring 8, and the swing arm 5 moves in accordance with the increase. Swings in the rotation direction of the flywheel 2 by a predetermined amount, and tries to maintain the rotation speed at the set rotation speed by driving the throttle valve 11 in the closing direction via the link 9 and the drive lever 10.

When the throttle valve 11 is driven in the closing direction and the load state is restored, the engine speed decreases, and the electromagnetic force F acting on the swing arm 5 gradually weakens accordingly. The electromagnetic force F balances the tensile force of the spring 8 and the swing arm 5 returns to the original fixed position, whereby the throttle valve is returned to the predetermined opening position and the engine speed reaches the set speed. Will be retained.

Further, when the engine speed decreases below the set speed due to an increase in load and the like, the tensile force of the spring 8 becomes larger than the electromagnetic force F acting on the swing arm 5, and the amount of decrease is Accordingly, the swing arm 5 swings in a direction opposite to the rotation direction of the flywheel 2 by a predetermined amount, thereby driving the throttle valve 11 in the opening direction via the link 9 and the drive lever 10 to set the rotation speed. Try to maintain the rotation speed.

When the throttle valve 11 is driven in the opening direction and the load state is restored, the engine speed increases and the electromagnetic force F acting on the swing arm 5 is gradually strengthened accordingly. The electromagnetic force F balances the tensile force of the spring 8 and the swing arm 5 returns to the original fixed position, whereby the throttle valve is returned to the predetermined opening position and the engine speed reaches the set speed. Since the flywheel 2 made of cast iron is used in this configuration example, a disc 3 made of a non-magnetic material such as aluminum is separately attached to the flywheel 2. If the wheel 2 is made of a non-magnetic material such as cast aluminum, the disk 3 can be integrally formed with the flywheel 2.

In the engine cabana device configured as described above, the length of the magnetic circuit that forms the magnetic flux φ is shortened and the magnetic resistance is reduced, so that the magnetic field acting on the disk 3 is enhanced and a large electromagnetic force is obtained. Will be available.

Therefore, it is possible to effectively reduce the size and weight of the magnets 71 to 74 as a whole.

Further, since the magnetic closed circuits are formed by attaching the magnets 71 to 74 to the plate-shaped yokes 61 and 62 separately provided, the yokes 61 and 62 are fixed to each other. Holder part formed at the tip of the swing arm 5
Any material can be used for 51.

Therefore, the arm main body 52 of the swing arm 5 and the holder portion 51 thereof can be integrally molded with synthetic resin or the like, effectively reducing the weight of the swing arm 5 itself,
In addition, the degree of freedom of the shape of the holder portion 51 can be obtained.

When viewed as the entire governor device, according to the present invention, the drive control in the opening and closing directions of the throttle valve 11 according to the increase and decrease of the rotational speed of the engine is performed without contact with the rotational part of the engine. There is no need to worry about wear between the rotating parts.

Even though it is a non-contact type, the throttle valve can be directly responded to the fluctuation of the engine speed without replacing the dynamic fluctuation of the engine speed with the static fluctuation.
Since the drive control of the opening / closing direction of 11 is performed, the drive control of the throttle valve 11 can be performed with good responsiveness.

Further, as compared with the governor weight in the conventional centrifugal weight type governor device, the change of the center of gravity position due to the swing position does not pose a problem, and therefore, the magnitude and swing of the electromagnetic force F acting on the swing arm 5 can be reduced. The swing position of the arm 5 is maintained in a substantially linear proportional relationship, and it becomes possible to perform drive control in the opening and closing directions of the throttle valve 11 with stable control characteristics.

Further, in the governor device according to the present invention, the drive control in the opening and closing directions of the throttle valve 11 according to the increase and decrease of the engine speed can be performed by performing the simple adjustment without requiring a high degree of assembly accuracy and the number of parts. Can be performed stably and accurately.

Further, the control stroke and the driving force for opening and closing the throttle valve 11 can be selected in a wide range only by changing the connection position of the link 9 in the swing arm 5 in the longitudinal direction.

Effects As described above, in the rotation speed / position conversion device according to the present invention,
A pair of magnets is provided so that the rotating discs made of a non-magnetic material are sandwiched from both sides by a gap, and the opposite poles face each other, and at least two pairs of the pair of magnets are provided,
Different poles are arranged side by side on the same side of the disk so as to be adjacent to each other in the rotational direction or the radial direction of the disk, and adjacent magnets are provided on a plate-shaped yoke attached to a holding member on the movable body side. However, by carefully installing the magnet, the length of the magnetic circuit can be minimized and a large electromagnetic force can be efficiently generated.

Further, according to the present invention, by utilizing the rotation speed / position conversion device in which the arrangement of the above-mentioned yoke and magnets is specially devised, the disk is rotated in synchronization with the rotation of the engine so that it can be rocked. As described above, the yoke and the magnet are attached to the swinging member pivotally supported by the device with a special device, and a spring member is provided to prevent the swinging member from swinging in one direction. The engine governor device is configured by providing a drive mechanism that drives the throttle valve of the engine in the opening and closing directions according to the swing, and a magnetic circuit designed to be compact and lightweight is sufficient. The electromagnetic force can be obtained, and with a simple structure and adjustment, the control stroke of the valve opening and closing and the degree of freedom of setting the driving force can be set in a wide range without contacting the rotating part of the engine, and the engine can be adjusted. Stable and has an excellent advantage that it is possible to perform accurately.

[Brief description of drawings]

FIG. 1 (a) is a front view of a magnet portion in a rotation speed / position conversion device according to an embodiment of the present invention, and FIG. 1 (b) is a first view.
FIG. 2A is a plan view of a magnet portion showing the shape of the magnet in the same embodiment, and FIG. 5 is a rotation speed according to another embodiment of the present invention. .Front view of the magnet portion of the position conversion device, FIG. 6 (a),
FIG. 7B is a partial plan view and a front view showing an example of the configuration of an engine governor device using the rotation speed / position conversion device according to the present invention, and FIG. 7 is a conventional rotation speed / position conversion device. It is a front view of the magnet part in an apparatus. 1 ... Crankshaft, 2 ... Flywheel, 3 ...
… Disc, 4… Pivot, 5… Swing arm, 61, 62…
… Yoke, 71-74 …… Magnet, 8 …… Spring, 9 ……
Link, 10 …… Drive lever, 11 …… Slut valve

Claims (2)

[Claims] 1. A rotating disk made of a non-magnetic material is sandwiched by different magnetic poles of a permanent magnet from both sides through a gap.
Further, at least four permanent magnets are arranged on both sides of the rotating disc so that different magnetic poles of the permanent magnets are adjacent to each other on the same side of the rotating disc in the rotation direction or the radial direction of the rotating disc. A rotation speed / position conversion device configured by mounting permanent magnets adjacent to each other on the same side of a plate on each plate-shaped yoke provided on a holding member on the movable body side. 2. A disk made of a non-magnetic material that rotates in synchronism with the rotation of an engine, and a rocking member pivotally supported so as to be rockable, and the disk is attached to the rocking member. A magnet for generating an electromagnetic force that causes the rocking member to rock in response to the rotation of the disk by applying a magnetic field to the magnet and the rocking member are provided so as to suppress the rocking in one direction. And a drive mechanism that drives the throttle valve of the engine in the opening direction and the closing direction according to the swing of the swing member. At least four permanent magnets on both sides of the rotating disc so that different magnetic poles are sandwiched and different magnetic poles of the permanent magnets on the same side of the rotating disc are adjacent to each other in the rotational direction or radial direction of the rotating disc. Is installed on the rotating disk. The permanent magnets which are adjacent respectively the side,
A rotation speed / position conversion device used as a governor of an engine, characterized in that the rotation speed / position conversion device is mounted on each plate-shaped yoke provided on a holding member on the movable body side.