JPH09261945A - Governor of rotary element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the construction of a governor and provide a non-friction type or non-oil type governor. SOLUTION: Movable magnets 3 are attached to a rotary element 1 made of nonmagnetic material so as to have the center axes 1 of the fluxes of the magnets 3 in the direction of rotation of the rotary element 1. Fixed magnets 4 which correspond to the movable magnets 3 to form pairs are fixed to a fixing support frame 5 so as to be placed close to the movable magnets 3 on the rotary element 1. The center axes (m) of the fluxes of the fixed magnets 4 are in parallel with the rotation axis (a) of the rotary element 1 and, further, the polarities of the leading ends of the movable magnets 3 in rotation are the same as the polarities of the facing sides of the corresponding fixed magnets 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel speed governor of a rotating body using a magnet, which can be used in, for example, a door closer. More specifically, it is proposed in order to reduce the rotational speed of the rotating body in a certain rotating system.

[0002]

DISCLOSURE OF THE INVENTION The speed governor for a rotating body according to the present invention has a simple mechanism and is of a non-friction type.
The purpose of development is to make it a non-oil type that does not use hydraulic oil.

[0003]

In order to achieve the above object, a speed governor for a rotating body according to the invention described in claim 1 has a rotating body made of a non-magnetic material of a certain rotating system in a rotating direction thereof. A movable magnet having a central axis of magnetic flux oriented along it; a fixed magnet paired with the movable magnet is fixedly provided on a fixed support frame so as to be close to the movable magnet on the rotating body. The center axis of the magnetic flux of the fixed magnet is parallel to the rotation axis of the rotating body, and the magnetic pole on the tip side of the movable magnet and the opposing magnetic pole of the fixed magnet facing the rotating body when the rotating body rotates. The configuration condition is that the magnetic pole is used.

The invention according to claim 2 is characterized in that, in the speed governor for a rotating body according to claim 1, the mounting position of the fixed magnet with respect to the support frame can be adjusted in the rotational axis direction of the rotating body. .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings. First shown in FIGS. 1 and 2
In the embodiment, reference numeral 1 is a rotating body of a certain rotating system, and is formed of a non-magnetic material such as brass, aluminum, or a synthetic resin material into an arbitrary shape such as a disk shape or a bar shape.

Further, reference numeral 2 is a rotary shaft of the rotary body 1 supported by a bearing (not shown), and a rotary force is applied from a drive source such as a motor, an engine, a spring or the like.

The rotating body 1 made of a non-magnetic material has
Its direction of rotation (tangential direction in any concentric circle of rotation)
1 with the central axis l of the magnetic flux oriented substantially along
One or more (four in the illustrated example) movable magnets 3 which are permanent magnets are mounted and fixed.

As means for fixing the movable magnet 3 to the rotating body 1, any means such as adhesion, fitting, screwing or the like can be used.

In the vicinity of the rotating body 1, each movable magnet 3
One or a plurality (one in the illustrated example) of fixed magnets paired with is fixedly attached to an appropriate support frame 5 via attachment pieces 6.

In the first embodiment, the mounting piece 6 to which the fixed magnet 4 is fixed is attached to the fixed support frame 5 with the set screw 7 through the elongated hole, and the mounting position of the fixed magnet 4 with respect to the support frame 5. Can be adjusted in the direction of the rotation axis a of the rotating body 1. In other words, the fixed magnet 4
The gap d between the disk and the disk-shaped rotating body 1 can be changed.

At least a part of the central axis m of the magnetic flux of the fixed magnet 4 on the side of the rotating body 1 is made parallel to the rotating axis a of the rotating body 1, and in the direction of arrow P of the rotating body 1. Magnetic pole (N or S) on the tip side of the movable magnet 3 when rotating
The movable magnet 3 and the fixed magnet 4 are set so that the opposite magnetic pole (N or S) of the fixed magnet 4 that faces the magnet has the same magnetic pole.

At this time, the magnetic pole (S or N) on the opposite side of the fixed magnet 4 is arranged at a position where it does not exert a magnetic action on each movable magnet 3.

Although both magnets 3 and 4 in the illustrated example are rectangular parallelepipeds, the shapes of both magnets 3 and 4 may be arbitrary other than the rectangular parallelepiped.

One or both of the two magnets 3 and 4 may be an electromagnet, but it is not preferable to use the electromagnet as the movable magnet 3 on the rotating body 1 side because the wiring is troublesome.

In the second embodiment shown in FIG. 3, the adjustment of the fixed magnet 4 with respect to the support frame 5 in the direction of the rotation axis a, that is, the gap d between the fixed magnet 4 and the disk-shaped rotating body 1 is performed. The change is extremely easy.

In this example, the fixed magnet 4 and the support frame 5 are
A mounting means 60 interposed between the base frame 61 and a hollow base frame 61 fixed to the support frame 5 with a set screw 7, and a fixed magnet 4 fixed to the protruding portion of the base piece 61. It is composed of a piece 62, an adjusting screw 63 that is rotatably inserted in the base piece 61 and has its tip screwed into the sliding piece 62, and a positioning compression spring 64 that is fitted around the adjusting screw 63. ing.

According to this attaching means 60, a tool such as a screwdriver is engaged with the tool engaging portion 65 of the adjusting screw 63,
The distance of the gap d can be easily changed simply by turning the tool to the right or left.

Next, the operation of the speed governor of the present invention will be described with reference to the explanatory views of FIGS. 4 and 5. In these drawings, as in the first and second embodiments, four movable magnets 3 on the rotating body 1 side are provided as shown by reference numerals 31 to 34, and the fixed magnet 4 on the supporting frame 5 side is provided. Only one is provided.

The rotary body 1 rotates clockwise as shown by the arrow P to reach the position shown in FIG. 4, and the first movable magnet 31 moves to the fixed magnet 4.
When approaching to, the magnetic pole on the tip side of the first movable magnet 31 and the facing magnetic pole of the fixed magnet 4 (N and N or S and S) are the same, so a repulsive force is generated between the magnets 31 and 4. , The braking force is applied to the rotating body 1.

While the rotation of the rotating body 1 further progresses until the rotating body 1 reaches the position shown in FIG. 5, the first movable magnet 31 substantially overlaps a part or all of the fixed magnet 4 when viewed from the front. Excluding the section, that is, the first movable magnet 31 is fixed magnet 4
Since the magnetic pole on the rear end side of the first movable magnet 31 and the opposing magnetic pole of the fixed magnet 4 face each other in the relationship of different magnetic poles (S and N or N and S) except for the section closest to A suction force acts between 31 and 4, and here also a braking force is applied to the rotating body 1.

Further, the rotating body 1 has a gradual rotation speed due to the braking force applied between the other second to fourth movable magnets 32 to 34 and the same fixed magnet 4 as well. Go reduced.

When the rotating force is not additionally supplied from the drive source to the rotating body 1, the rotating body 1 is stopped by the speed governor according to the present invention.

In the speed governor of the rotating body according to the present invention, the braking force on the rotating body acts in a pulse shape, and the number of braking pulses increases in proportion to the rotational speed of the rotating body.

In other words, the braking force is proportional to the rotation speed of the rotating body, and this speed control characteristic is the same as that of other speed governors using viscous resistance or eddy current.

When the mounting position of the fixed magnet 4 with respect to the support frame 5 is changed so that the fixed magnet 4 approaches the rotating body 1, that is, when the gap d is reduced, the aforementioned braking force is increased. On the contrary, when the fixed magnet 4 is changed in its mounting position so as to move away from the rotating body 1 to increase the gap d, the above-mentioned braking force can be reduced.

[0026]

According to the speed governor for a rotating body of the present invention described above, the braking force can be surely applied to the rotating body and the rotating body can be decelerated easily regardless of the simple mechanism. Since it is a non-oil type without a friction member such as a brake shoe, it is easy to maintain parts replacement and the like, and the braking force can be adjusted to be increased or decreased.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a partial vertical plan view showing a second embodiment of the present invention.

FIG. 4 is an explanatory view showing the speed governor of the present invention when the rotating body is operating, as viewed from the front at a certain point.

FIG. 5 is an explanatory view showing the front view at another time point after the rotary body has further rotated 45 ° from the position shown in FIG. 4;

[Explanation of symbols]

 1 rotating body 3 movable magnet 4 fixed magnet 5 support frame l central axis of movable magnet m central axis of fixed magnet a rotational axis

Claims (2)

[Claims] 1. A rotating body made of a non-magnetic material of a certain rotating system, equipped with a movable magnet having a central axis of magnetic flux oriented along the direction of rotation; rotating a fixed magnet paired with the movable magnet. Fixedly provided on a fixed support frame so as to be close to the movable magnet on the body; and the central axis of the magnetic flux of the fixed magnet is parallel to the rotational axis of the rotating body and A speed governor for a rotating body, wherein the magnetic pole on the front end side of the movable magnet and the opposing magnetic pole of the fixed magnet facing the movable magnet during rotation are the same. 2. The speed governor for a rotating body according to claim 1, wherein the mounting position of the fixed magnet with respect to the support frame can be adjusted in the direction of the rotation axis of the rotating body.