JPH0570732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a damper device used in a motor, and more particularly to a damper device that utilizes the viscous resistance of viscous fluid.

《Prior Art》 Normally, motors used in various control devices, especially stepping motors, when the motor stops rotating,
The rotating body stops at a determined position after the damped vibration. In order to quickly stop the stepping motor, it is necessary to absorb this vibration energy. A damper device is attached to absorb this vibrational energy.

Various types of damper devices have been proposed, including those using permanent magnets, those using elastic materials such as rubber, and those using viscous fluid. Commonly used.

This viscous damper device includes a rotating ring fixed to the rotating shaft of a stepping motor, and an opposing ring fitted to the outer circumferential surface or inner circumferential surface of this rotating ring, and between the rotating ring and the opposing ring. is filled with viscous fluid, and the viscous resistance force of the viscous fluid is proportional to the speed difference between the rotating wheel and the opposing wheel when the stepping motor stops rotating, which reduces the vibration of the rotating shaft when the stepping motor stops rotating. The aim is to suppress this as much as possible.

In this way, in the conventional viscous damper device, when the stepping motor stops rotating, the viscous fluid existing in the gap between the rotating wheel and the opposing wheel is viscous fluid proportional to the speed difference between the rotating wheel and the opposing wheel. The damping effect is produced by the viscous resistance of the viscous fluid, but if the temperature drops due to changes in the environmental temperature or heat generated by the stepping motor, for example, the volume of the viscous fluid shrinks, causing damage to the rotating wheels. This had the disadvantage that a space was created between the opposing wheels and the damping effect was reduced.

Conversely, it has been pointed out that when the temperature rises, the volumetric expansion of the viscous fluid occurs, causing the viscous fluid to seep out.

<Problems to be Solved by the Invention> As described above, in conventional viscous damper devices, changes in external temperature cause volumetric contraction or volumetric expansion of the viscous fluid, resulting in viscous fluid seepage and uniform damping effects. However, this invention was made to solve this problem, and an object of the present invention is to provide a damper device that uses viscous fluid by reducing the external environment. It is an object of the present invention to provide a damper device which can obtain a substantially uniform viscous resistance force even if a volume change of a viscous fluid occurs due to a temperature change or the like, and can always provide a constant damping effect.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a rotating ring that is fixed to the rotating shaft of a motor and rotates integrally with the rotating shaft, and a rotating ring that is arranged coaxially with the rotating ring and rotates. An opposing ring that has a circumferential surface facing the circumferential surface of the ring with an equal gap in the radial direction and is independent of the rotation of the rotating ring, a viscous fluid filled in the gap, and an opening in the opposing ring or the rotating ring. The damper device was constructed of a sheet-like elastic member placed on the side surface to airtightly seal the viscous fluid.

<<Operation>> According to the above configuration, since the viscous fluid is sealed by the elastic member, when the volume of the viscous fluid contracts due to changes in the environmental temperature, heat generation of the stepping motor, etc., the elastic member It is deformed, that is, pulled toward the viscous member, and the desired damping effect is obtained without creating a space between the rotating ring and the opposing ring. Conversely, when the temperature rises, the viscous fluid When volumetric expansion occurs, the elastic member is deformed, that is, pressed outward in a bulging shape, making it possible to prevent the viscous fluid from seeping outside as much as possible, and to achieve the desired result. A damping effect can also be expected.

<<Example>> Hereinafter, an example of a damper device for a stepping motor according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are cross-sectional views showing different types of viscous damper devices.
The figure shows an outer ring fixed type damper device, and FIG. 3 shows an inner ring inertia type inertial coupling viscous damper device.

In FIG. 1, this damper device 1 is arranged coaxially with a rotating wheel 4 fixed to a rotating shaft 3 of a stepping motor 2 by bolting or the like, and is arranged coaxially with the rotating shaft 3 of a stepping motor 2. an opposing ring 5 that can idle independently and has an inner circumferential surface facing the outer circumferential surface of the rotating ring 4 with a gap therebetween, and silicone oil filled between the rotating ring 4 and the opposing ring 5. It is composed of a viscous fluid 6 such as, an elastic member 7 such as rubber fixed to one side of the opposing ring 5, and a lid member 8 to airtightly seal the viscous fluid 6.

Note that a space 9 is provided between the elastic member 7 and the lid member 8 to allow the elastic member 7 to deform. freely held.

Next, the operation of this damper device 1 will be explained. The rotating wheel 4 is connected to the stepping motor 2.
As the rotating wheel 4 rotates, the opposing wheel 5 also rotates in the same direction. However, when the stepping motor 2 stops rotating, the rotating wheel 4 quickly stops, but the opposing wheel 5 continues to rotate due to inertia.
A speed difference occurs between the two. A viscous resistance force is generated in the viscous fluid 6 interposed between the rotating wheel 4 and the opposing wheel 5 in proportion to this speed difference, and the vibrations of the rotating wheel 4 are quickly absorbed by this viscous resistance force.

Furthermore, in the present invention, since the viscous fluid 6 is airtightly sealed by the elastic member 7, when the temperature decreases due to a change in the environmental temperature or heat generation of the motor 2, for example, the viscous fluid 6 The elastic member 7 is deformed into a curved shape toward the viscous fluid 6, and no space is created in the gap between the rotating ring 4 and the opposing ring 5. If volumetric expansion of the viscous fluid 6 occurs,
It is possible to prevent the elastic member 7 from curving outward and the viscous fluid 6 from seeping out.

In this way, in this embodiment, the viscous fluid 6
By providing the elastic member 7 that airtightly seals the viscous fluid 6, volume contraction and volume expansion of the viscous fluid 6 due to temperature changes can be absorbed by deformation of the elastic member 7, thereby providing a substantially uniform damping effect. .

In addition, since the volume expansion of the viscous fluid 6 due to temperature rise can be absorbed by the expansion of the elastic member 7,
This is extremely practical as the viscous fluid 6 does not seep out.

Next, the damper device shown in FIG. 2 is an outer ring fixed type damper device, and this damper device 11 is different from the above embodiment in that the opposing wheel 15 is fixed to the housing of the stepping motor 12. , also in this embodiment, it has a rotating ring 14 fixed to the rotating shaft 13, and an inner circumferential surface that is coaxial with the rotating ring 14 and faces the outer circumferential surface of the rotating ring 14 with a gap, A viscous fluid 16 is filled between the motor 12 and an opposing wheel 15 that is directly fixed to the housing of the motor 12, and this viscous fluid 16 is hermetically sealed by an elastic member 17.

Therefore, the rotating wheel 14 rotates synchronously with the rotation of the stepping motor 12, and when the motor 12 stops rotating, the rotating wheel 14 quickly stops. 14 is absorbed by the viscous fluid 16 filled in the space 16, and the deformation of the elastic member 17 causes volumetric expansion and contraction of the viscous fluid 16 (changes in environmental temperature, heat generation of the motor, etc.). etc.) is the same as the previous embodiment.

Next, the damper device shown in FIG. 3 is an inner ring inertia type inertial coupling viscous damper device, and this damper device 21 has a rotating ring 24 fixed to a rotating shaft 23 of a stepping motor 22. An opposing ring 2 that is arranged coaxially and has an outer circumferential surface that faces the inner circumferential surface of the rotating ring 24 with a gap therebetween.
5 is fitted onto the shaft 24a of the rotating ring 24 so as to be able to idle independently of the rotation of the rotating shaft 23.

A viscous fluid 26 is filled between the rotating ring 24 and the opposing ring 25, and the viscous fluid 26 is hermetically sealed by the elastic member 27, and the lid member 2
8, the opening is closed.

Therefore, the basic effects are shown in Figures 1 and 2.
This is the same as the damper device shown in the figure, the only difference being that a rotating ring is provided on the outer ring side and an opposing ring is provided on the inner ring side.

In this embodiment as well, the deformation of the elastic member 27 causes volume expansion of the viscous fluid 26 due to temperature changes.
A constantly constant viscous fluid 26 that absorbs volumetric contraction
The same damping effect as in the above embodiment can be expected.

<<Effects>> As explained above, in the damper device for the stepping motor according to the present invention, the viscous fluid is hermetically sealed by the elastic member, so that the volumetric contraction and volumetric expansion of the viscous fluid due to temperature changes can be prevented. Since the above-mentioned absorption occurs through deformation of the elastic member, when the volumetric contraction of the viscous fluid occurs due to a decrease in temperature, the elastic member curves toward the viscous fluid side, and conversely, when the viscous fluid expands in volume due to a rise in temperature. When the elastic member is pressed by the viscous fluid and curves outward, a nearly uniform viscous resistance force is obtained, and a constant damping effect can be expected. By absorbing the volumetric expansion of the viscous fluid with the member, it is possible to prevent the viscous fluid from seeping out, and its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an outer ring inertia type inertial coupling viscous damper device which is a first embodiment of the damper device according to the present invention, and FIG. 2 is a sectional view showing an outer ring fixed type damper device showing another embodiment of the present invention. 3 are sectional views showing an inner ring inertia type inertial coupling viscous damper device showing still another embodiment of the present invention. 1, 11, 21... damper device, 2, 12,
22...Stepping motor, 3, 13, 23...
... Rotating shaft, 4, 14, 24... Rotating wheel, 5, 1
5, 25... Opposing wheel, 6, 16, 26... Viscous fluid, 7, 17, 27... Elastic member, 8, 18, 2
8... Lid member, 9, 19, 29... Space part, 10
……bearing.

Claims (1)

[Claims] 1. A rotating ring fixed to the rotating shaft of the motor and rotating integrally with the rotating shaft, and a rotating ring arranged coaxially with the rotating ring and facing the circumferential surface of the rotating ring with an equal gap in the radial direction. an opposing ring having a surface and independent of the rotation of the rotating ring; a viscous fluid filling at least the gap; and an opposing ring disposed on an opening side of the opposing ring or the rotating ring to airtightly seal the viscous fluid. A damper device composed of a sheet-like elastic member for absorbing vibrations of the rotating wheel by the viscous resistance force of the viscous fluid generated according to the rotational speed difference between the rotating wheel and the opposing wheel. A damper device for a motor, characterized in that a substantially uniform damping effect is obtained by absorbing volumetric contraction and volumetric expansion of the viscous fluid due to temperature changes by deformation of the elastic member.