JPH08326842A - Motor mount - Google Patents

Abstract

PURPOSE: To provide a motor mount which satisfies high supporting accuracy and excellent vibration insulation for a motor. CONSTITUTION: A first attaching panel 11, which is attached to a chassis 4 on a machine body side attaching seat 112, and a second attaching panel 12 which is attached to a motor 5 on a manor side attaching seat 122, are elastically coupled with each other through the intermediary of an elastomer 13 between an inner tapered part 111 of the first attaching panel 11 and an outer tapered part 121 of the second attaching panel 12 so as to be torsionable, relative to each other. Further, the deformation of the elastomer 3 caused by a torsional displacement input effects in a shearing direction so as to lower its spring constant, and accordingly, the transmission of torsional vibration from the motor to the chassis 4 is effectively reduced, and a displacement in a pinching direction cased by the weight of the motor 5, a radial load exerted to an output shaft 5a of the motor 5 or the like, is received by the elastomer in its compressing direction, thereby it is possible to exhibit a large support force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor mount mounted on a mounting portion of a motor, for example, a stepping motor, for insulating torsional vibrations caused by rotational driving of the motor from the apparatus body side.

[0002]

2. Description of the Related Art Stepping motors are used for paper feeding of facsimiles, copying machines, etc., and for servo driving of print heads and paper feeding of printers. These motors generate torsional vibrations when driven. From the above, it is attached to the inner wall surface of the machine body of the above-mentioned facsimile machine or the like via a vibration-proof mount.

Conventionally, this type of mount is typically shown in FIG.
Further, as shown in FIG. 5, the plate-shaped body-side mounting member 1 and the plate-shaped motor-side mounting member 2 that is arranged so as to face the body-side mounting member 1 are elastically connected via the annular elastomer 3. The fuselage-side mounting member 1 has a structure of
In addition, the motor-side mounting member 2 is connected to the motor 5, and the torsional vibration generated in the motor 5 is applied to the elastomer 3
Insulation is performed by the twisting deformation operation of (1), and vibration transmission to the chassis 4 is reduced. FIG. 4 shows a case where the motor 5 is attached to the vertical chassis 4 in a posture in which the output shaft 5a thereof is substantially horizontal, and FIG. 5 shows a bottom of the horizontal chassis 4 so that the output shaft 5a is substantially vertical. Shown when mounted on the side.

[0004]

In the motor mount of this type, the elastomer 3 has the weight W of the motor 5 and
Alternatively, the radial load acting on the tip of the output shaft 5a due to gear engagement or the like causes shear deformation in a direction perpendicular to the shaft, that is, the motor 5 is displaced, so that, for example, in the case of gear drive, the output shaft 5a is twisted. Due to the displacement in the direction (bending direction, radial direction), tooth jump may occur between the drive gear 6 and the driven gear 7, or the belt tension may greatly change in the case of driving the belt. Moreover, it is pointed out that the displacement of the motor 5 tends to be large due to the load in the prying direction because the distance between the elastic support portion of the elastomer 3 and the center of gravity G of the motor 5 is large.

To improve the vibration isolation function of this type of mount, it is effective to reduce the spring constant of the elastomer 3. However, in order to eliminate the above-mentioned problem caused by the displacement of the support position of the motor 5, the spring force of the elastomer 3 is increased to increase the support force for the motor 5, thereby increasing the position accuracy of the motor 5. There is a need. Therefore, in order to improve the support accuracy for the motor 5, the vibration insulation performance is sacrificed to some extent.

The present invention has been made in view of the above problems, and a main object thereof is to provide a mount for a motor which can satisfy both high support accuracy for a motor and excellent vibration insulation. is there.

[0007]

As a means for effectively solving the above-mentioned technical problems, a motor mount according to the present invention includes an inner taper portion having a small diameter on the tip side and a base end of the inner taper portion. A first mounting plate consisting of a body side mounting seat extending in the radial direction, an outer taper portion arranged outside the first mounting plate and inclined corresponding to the inner taper portion, and a small diameter of the outer taper portion. The second mounting plate includes a motor-side mounting seat that extends in the radial direction from the base end on the side, and an elastomer joined between the inner tapered portion and the outer tapered portion facing each other. In this case, more preferably, the motor is configured to be mounted on the motor side mounting seat of the second mounting plate through the inner circumference of the inner tapered portion of the first mounting plate.

[0008]

The first mounting plate mounted on the machine side at the machine side mounting seat and the second mounting plate mounted on the motor at the motor side mounting seat are the inner taper portion of the first mounting plate and the second mounting plate. The elastomer is elastically coupled to each other via an elastomer between the outer tapered portion and the outer taper portion. The deformation of the elastomer due to the torsional displacement acts in the shearing direction, resulting in a low spring constant and transmission of torsional vibration from the motor. Effectively reduce. On the other hand, displacement in the twisting direction due to the weight of the motor or radial load on the motor output shaft is received by the elastomer in the compression direction, so that a large supporting force is obtained.

Also, by mounting the motor on the motor side mounting seat of the second mounting plate through the inner circumference of the inner taper portion of the first mounting plate, the distance between the elastic support portion by the elastomer and the center of gravity of the motor is reduced, The amount of displacement in the prying direction can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of a motor mount 10 according to the present invention. Reference numeral 4 is a part of a chassis which stands up substantially vertically inside the equipment.
Is a motor attached to the chassis 4 via the motor mount 10 of this embodiment, for example, a stepping motor. A shaft hole 4a for inserting the output shaft 5a of the motor 5 is formed at the center of the motor mounting position on the chassis 4. The motor mount 10 is a chassis 4
A first mounting plate 11 mounted on the first mounting plate 11, a second mounting plate 12 for seating and fixing the motor 5, and the first and second mounting plates 1
1 and 12, and an elastomer 13 interposed between the two.

The first mounting plate 11 has an inner taper portion 111 having a smaller diameter on the tip 111a side, and the inner taper portion 111.
From the large-diameter side base end 111b of the machine body side mounting seat 112 expanded in the outer diameter direction. The machine body side mounting seat 112 is concentric with the shaft hole 4a in the chassis 4 through a screw member (not shown). It is fixed. The second mounting plate 12 arranged on the outer side of the first mounting plate 11 has an outer tapered portion 121 that is inclined corresponding to the inner tapered portion 111, that is, an inclined surface whose cross section is parallel to the inner tapered portion 111. The outer taper portion 121 includes a base end 121a on the small diameter side and a motor side mounting seat 122 expanded in the outer radial direction. The motor 5 is mounted on the motor side mounting seat 1 via a screw member (not shown).
The output shaft 5a is attached to the outer tapered portion 1
21 and the inner circumference of the inner taper portion 111 are inserted into the shaft hole 4 a of the chassis 4. The elastomer 13 is integrally vulcanized and bonded between the mutually facing surfaces of the inner taper portion 111 and the outer taper portion 121.

In the motor mount 10 according to this embodiment, the second mounting plate 12 on the motor 5 side is elastically connected to the first mounting plate 11 fixed to the chassis 4 via the elastomer 13. Since the motor 5 is supported so as to be torsionally displaceable, when vibration of the motor 5 in a torsional direction occurs due to its driving, the elastomer 13 is torsionally deformed due to the torsional displacement of the second mounting plate 12 due to the vibration. This torsional deformation acts between the facing surfaces of the inner taper portion 111 and the outer taper portion 121 in the shearing direction with a low spring constant, so that the transmission vibration to the chassis 4 side is effectively absorbed.

Further, the load in the prying direction due to the weight of the motor 5 is caused by the elastomer 1 between the tapered portions 111 and 121.
Since it acts on 3 in the direction of compression with a high spring constant, a sufficient supporting force is exerted. Therefore, the supporting accuracy for the motor 5 can be improved without sacrificing the vibration insulation.

This motor mount 10 is shown in FIG.
As shown in the second embodiment, the inclination angle θ of the inner taper portion 111 and the outer taper portion 121 is determined by the center of gravity G of the motor 5.
Is a range δ between the apex a of the cone extending the inner tapered portion 111 and the apex b of the cone extending the outer tapered portion 121 on the axis O of the first and second mounting plates 11 and 12. It is preferable to set so as to be located at. By doing so, the displacement of the motor 5 about the center of gravity G in the twisting direction is received by the compressive stress of the entire elastomer 13, and the supporting accuracy can be further improved.

Further, for example, the outer taper portion 12 of the second mounting plate 12 which is close to the airframe side mounting seat 112 of the first mounting plate 11
It is also effective to suppress the prying displacement of the motor 5 by providing a stopper 123 slidably in contact with the machine body side mounting seat 112 at the end of the motor 1. This stopper 123
Are arranged continuously or at equal intervals in the circumferential direction on the lower part or the whole of the end part of the outer taper part 121. Preferably, a low friction material 123a such as synthetic resin is provided on the sliding surface with the machine body side mounting seat 112. Is provided.

The use of the motor mount 10 according to each of the above embodiments is not limited to the mounting posture shown in FIG. 1, and it is needless to say that the mount can be mounted even when the chassis 4 is provided substantially horizontally. Yes.

FIG. 3 shows a motor mount 1 according to the present invention.
In the third embodiment of No. 0, the chassis 4 is provided substantially horizontally, and the motor mounting position of the chassis 4 is provided with an opening 4b having a size in which the motor 5 can be loosely fitted. . The motor mount 10 according to this embodiment
Is such that the inner diameter of the tip 111a of the inner tapered portion 111 of the first mounting plate 11 is such that the motor 5 can be loosely fitted, and the motor side mounting seat 122 of the second mounting plate 12 faces the inner tapered portion 111. Outer taper part 121
Is formed so as to extend in the inner diameter direction from the base end 121a on the smaller diameter side.

The first mounting plate 11 has a body side mounting seat 112, which is expanded from the large-diameter side base end 111b of the inner taper portion 111 in the outer diameter direction, is fixed to the upper surface of the outer periphery of the opening 4b in the chassis 4. On the other hand, the motor 5 includes the opening 4 b and the inner taper portion 1 of the first mounting plate 11 from the lower side of the chassis 4.
The second mounting plate 1 located on the upper side of the inner circumference of 11
2 is attached to the lower surface of the motor side mounting seat 122, and the output shaft 5a is inserted upward from the inner circumference of the motor side mounting seat 122.

Also in this embodiment, as in the first and second embodiments described above, the vibration in the torsional direction due to the driving of the motor 5 is absorbed by the deformation of the elastomer 13 in the shearing direction with a low spring constant. The transmission vibration to the chassis 4 side is effectively reduced. Further, the load due to the weight of the motor 5 is received by the compression of the elastomer 13, and in the mounting state shown in the drawing, the distance between the elastic support portion by the elastomer 13 and the center of gravity G of the motor 5 is reduced, so that the displacement amount in the prying direction is reduced. The size can be reduced, and the supporting accuracy can be further improved.

Further, the motor mount 10 according to this embodiment.
However, it is not limited to the mounting posture shown in FIG. 3, and similarly when the chassis 4 stands up substantially vertically, that is, 90 ° in the clockwise or counterclockwise direction in FIG.
It can be mounted in a rotated state. Also in this case, the distance between the elastic support portion formed by the elastomer 13 and the center of gravity G of the motor 5 is reduced, so that the support accuracy can be improved.

[0021]

According to the motor mount of the present invention, the input of the torsional vibration due to the driving of the motor is received in the shearing direction in which the spring constant of the elastomer becomes low, and the torsional direction due to the weight of the motor and the radial load on the motor shaft is twisted. Input is received in the compression direction, which increases the spring constant of the elastomer, it is not necessary to use a highly rigid elastomer material to increase the supporting force, and the distance between the center of gravity of the motor and the position supported by the elastomer is reduced. Therefore, it is possible to improve the support accuracy for the motor without sacrificing vibration insulation.

[Brief description of drawings]

FIG. 1 is a sectional view showing a usage state of a first embodiment of a motor mount according to the present invention by cutting along a plane passing through an axis.

FIG. 2 is a sectional view showing a second embodiment of a motor mount according to the present invention, taken along a plane passing through an axis.

FIG. 3 is a cross-sectional view showing a usage state of a third embodiment of the motor mount according to the present invention by cutting along a plane passing through an axis.

FIG. 4 is a cross-sectional view showing a usage state of a motor mount according to a conventional example, taken along a plane passing through an axis.

FIG. 5 is a cross-sectional view showing a usage state of a motor mount according to another conventional example, taken along a plane passing through an axis.

[Explanation of symbols]

 4 Chassis 4a Shaft Hole 4b Opening 5 Motor 5a Output Shaft 10 Motor Mount 11 First Mounting Plate 111 Inner Tapered Part 111a Tip 111b Base End 112 Machine Side Mounting Seat 12 Second Mounting Plate 121 Outer Tapered Part 121a Base End 122 Motor Side Mounting seat 123 Stopper 123a Low friction material 13 Elastomer

Claims (2)

[Claims] 1. An inner taper portion (111) having a small diameter on the tip (111a) side and an airframe side mounting seat (112) extending radially from a base end (111b) of the inner taper portion (111). A first mounting plate (11) and an outer tapered portion (1) disposed outside the first mounting plate (11) and inclined corresponding to the inner tapered portion (111).
21) and a second mounting plate (12) consisting of a motor side mounting seat (122) extending in the radial direction from the small-diameter side base end (121a) of the outer tapered portion (121), and the inner side facing each other. Elastomer (13) joined between the tapered portion (111) and the outer tapered portion (121)
And a mount for a motor, which comprises: 2. The motor according to claim 1, wherein the motor (5) has an inner taper portion (1) of the first mounting plate (11).
A motor mount, characterized in that it is attached to the motor side mounting seat (122) of the second mounting plate (12) through the inner circumference of (11).