JP2021001651A - Vibration control mount of motor - Google Patents

Abstract

To provide a vibration control mount of a motor which enables improvement of vibration control performance while securing durability.SOLUTION: A vibration control mount 1 of a motor includes: a first plate 11 which has a first insertion part 111, into which a rotary shaft 21 of a motor 2 is inserted, and is attached to a body of the motor 2 with the rotary shaft 21 protruding from the first insertion part 111 in one direction; a second plate 12 which has a second insertion part 121, into which the rotary shaft 21 is inserted, and is disposed facing the first plate 11 in a state that the rotary shaft 21 is inserted into the insertion part 121; and an elastic member 13 which connects the first plate 11 with the second plate 12. The second plate 12 is attached to a support 3 supporting the motor 2. A bearing 122 of the rotary shaft 21 is provided within the second insertion part 121.SELECTED DRAWING: Figure 1

Description

The present invention relates to an anti-vibration mount for a motor.

A stepping motor is used as a paper feed mechanism such as a copier, a print head of a personal computer printer, and a servo drive means of the paper feed mechanism. Since this stepping motor controls rotation and stop by being driven by pulse power, vibration is generated along with the operation. The stepping motor is attached to the support frame using a vibration-proof mount in order to suppress the deterioration of image quality due to the sound and vibration caused by the operation of the stepping motor.

FIG. 4 is a perspective sectional view showing a mounted state of the anti-vibration mount according to the conventional technique. The anti-vibration mount 100 includes an elastic member 13 that connects the first plate 11, the second plate 12, and the first plate 11 and the second plate 12. The first plate 11 is fixed to the motor 2, and the second plate is fixed to the frame 3 that supports the motor 2. The vibration generated when the stepping motor is driven is absorbed and insulated by the deformation operation of the elastic member 13, and the vibration transmission to the frame 3 side is reduced.

The main vibration component of the stepping motor, which is a problem here, is defined as the displacement in the twisting direction defined in the rotation direction of the motor (arrow R shown in FIG. 4) and the vibration centered on one point O on the rotation axis C of the motor. There are two types of displacement in the direction of rotation (arrow S or T shown in FIG. 4). It is known that the suppression of these two types of displacement components has a trade-off relationship with the rigidity of the elastic member 13. That is, in order to suppress the displacement in the twisting direction, the rigidity of the elastic member 13 must be lowered, but if the rigidity of the elastic member 13 is lowered, the effect of suppressing the displacement in the twisting direction tends to be reduced. If the displacement in the twisting direction is large, problems such as deterioration of the durability of the anti-vibration mount itself, generation of abnormal noise due to gear meshing, and displacement of the driven body may occur.

Therefore, Patent Documents 1 and 2 propose a structure in which a protrusion toward the other mounting plate (plate) is formed in the elastic member by providing a boss or a bent portion on one mounting plate (plate). There is. The protrusions increase the rigidity against displacement in the kojiri direction, and improve the effect of suppressing this displacement. Since this structure has a portion where the elastic member becomes thin, further improvement is required with a view to improving durability. Further, Patent Document 3 proposes a structure in which, instead of the protrusions of Patent Documents 1 and 2, at least three gaps are provided in the elastic member, and the rotating body is rotatably fitted in the gaps. By selecting a rotating body having a higher rigidity than the elastic member, the effect of suppressing the displacement in the kojiri direction is achieved as in the case of Patent Documents 1 and 2. In this structure, improvement in the rigidity of the elastic member in the compression direction is taken into consideration, so improvement in the tension direction is required to further suppress displacement in the kojiri direction.

Japanese Unexamined Patent Publication No. 2019-11842 Japanese Unexamined Patent Publication No. 2019-11843 Japanese Unexamined Patent Publication No. 2019-11844

The present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is to provide a vibration-proof mount for a motor having improved vibration-proof performance while ensuring durability. is there.

The present invention employs the following means in order to solve the above problems.
That is, the anti-vibration mount of the motor of the present invention has a first insertion portion through which the rotation shaft of the motor is inserted, and the rotation shaft is projected in one direction from the first insertion portion and attached to the motor body. A first plate to be formed, a second plate having a second insertion portion through which the rotation shaft is inserted, and a second plate having the rotation shaft inserted through the insertion portion and arranged to face the first plate, and the first plate. An anti-vibration mount for a motor comprising a plate 1 and an elastic member connecting the second plate, the second plate being attached to a support supporting the motor, and the second insertion portion. It is characterized in that the bearing of the rotating shaft is provided inside the above.
According to such an invention, since the displacement of the rotating shaft of the motor can be suppressed by the bearing, the vibration can be suppressed efficiently.

In one aspect of the present invention, the second plate includes a plate portion attached to the support and a cylindrical portion rising from a peripheral portion of the second insertion portion formed on the plate portion. The bearing is provided in the cylindrical portion.
According to such a configuration, since the cylindrical portion is formed on the second plate attached to the support and the bearing is provided in the cylindrical portion, the displacement of the rotation shaft of the motor in the kojiri direction can be effectively suppressed.

In one aspect of the present invention, the second plate is characterized in that a cylindrical portion with respect to the plate portion is formed by burring.
According to such a configuration, the above invention can be formed by an appropriate processing method.

In one aspect of the present invention, the tip of the rotating shaft is provided with a motor drive transmission member having an end surface in a direction orthogonal to the axis of the rotating shaft, and the bearing is a bearing body that supports the rotating shaft. A flange that is continuously provided at one end of the bearing body and extends outward in the radial direction orthogonal to the axis, and the flange is brought into contact with the end face of the motor drive transmission member. And.
According to such a configuration, since the bearing comes into contact with the motor drive transmission member, it is possible to further improve the suppression of the displacement of the motor in the kojiri direction.

In one aspect of the present invention, the motor body has an end face in a direction orthogonal to the axis of the rotation axis on the side where the rotation axis protrudes, and the bearing is a bearing body that supports the rotation axis. It is characterized in that it has a flange that is continuously provided at one end of the bearing body and extends outward in the radial direction orthogonal to the axis, and the flange is in contact with the end face of the motor body.
According to such a configuration, since the bearing comes into contact with the motor body, it is possible to further improve the suppression of the displacement of the motor in the kojiri direction.

In one aspect of the present invention, the bearing is a resin slide bearing.
According to such a structure, the above invention can be made of an appropriate material.

According to the present invention, it is possible to provide a vibration-proof mount for a motor with improved vibration-proof performance while ensuring durability.

It is a perspective sectional view which shows the mounting state of the anti-vibration mount in the 1st Embodiment of this invention. It is a perspective sectional view which shows the mounting state of the anti-vibration mount in the 2nd Embodiment of this invention. It is a perspective sectional view which shows the mounting state of the anti-vibration mount in the 3rd Embodiment of this invention. It is a perspective sectional view which shows the mounting state of the anti-vibration mount by the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First Embodiment)
FIG. 1 is a perspective sectional view showing a mounted state of the anti-vibration mount 1 according to the first embodiment of the present invention.
As shown in FIG. 1, the anti-vibration mount 1 of the present embodiment has a first insertion portion 111 through which the rotation shaft 21 of the motor 2 is inserted, and the rotation shaft 21 is inserted from the first insertion portion 111. It has a first plate 11 that protrudes in the direction and is attached to the main body 22 of the motor 2 and a second insertion portion 121 through which the rotation shaft 21 is inserted, and the rotation shaft 21 is inserted through the insertion portion 121. A second plate 12 arranged to face the first plate 11 and an elastic member 13 for connecting the first plate 11 and the second plate 12 are provided, and the second insertion portion is provided. A bearing 122 of the rotating shaft 21 is provided inside the 121.

The second plate 12 is attached to a support 3 that supports the motor. Here, the support 3 corresponds to a frame of a device to which the motor 2 is attached and uses the driving force of the motor. The device in this case includes, for example, a copier or a printer provided with a paper feed mechanism.

Here, in the motor 2, an annular stator (not shown) is provided between the front bracket 221 and the rear bracket 222, and a rotor (not shown) fixed to the rotating shaft 21 is arranged inside the stator. The rotating shaft 21 is supported by the front bracket 221 and the rear bracket 222 via bearings (not shown) arranged in the motor 2.
The front bracket 221 and the rear bracket 222, the stator, and the rotor constitute the motor body 22, and the rotating shaft 21 projects outward from the front bracket 221 of the motor body 22. The end surface 223 on the side where the rotation shaft 21 of the front bracket 221 protrudes is a flat surface orthogonal to the axis C of the rotation shaft 21.

The first plate 11 includes a plate portion 113 attached to the main body of the motor 2. The second plate 12 includes a plate portion 123 attached to the support 3, and a cylindrical portion 124 that rises from a peripheral portion of the second insertion portion 121 formed in the plate portion 123, and the cylindrical portion. The bearing 122 is provided in 124. The bearing 122 is provided so that the rotating shaft 21 can rotate and slide without a gap with respect to the outer circumference 211 of the rotating shaft 21. The cylindrical portion 124 with respect to the plate portion 123 is formed by burring.

A resin slide bearing can be applied to the bearing 122. Examples of the resin material used for forming this bearing include polytetrafluoroethylene (PTFE), polyacetal (POM), polyamide (PA) and the like. Further, as the bearing 122, instead of the resin bearing, a sintered oil-impregnated bearing in which a sintered alloy is impregnated with a lubricating oil, a ball bearing, or the like may be adopted. The bearing 122 smoothly and rotatably supports the rotating shaft 21.

A hole 115 is provided in the plate portion 113 of the first plate 11, and the first plate 11 is fixed to the end surface 223 of the motor main body 22 by a screw (not shown) inserted through the hole 115. There is. A hole 125 is provided in the plate portion 123 of the second plate 12, and the second plate 12 is fixed to the support 3 that supports the motor 2 by a screw (not shown) inserted through the hole 125. Has been done.
The elastic member 13 is arranged between the first plate 11 and the second plate 12 so as to surround the first insertion portion 111 and the second insertion portion 121, and is arranged in the axis C direction of the rotation axis 21. The end faces are fixed to the first plate 11 and the second plate 12.

A pinion gear 24 (motor drive transmission member) is attached to the tip of the rotating shaft 21 of the motor 2. The pinion gear 24 is formed in a columnar shape, has a hole 241 in which the rotating shaft 21 is fitted, and transmits the rotational force of the rotating shaft 21 to the driven gear (not shown) on the outer peripheral portion thereof. A plurality of teeth 242 for the purpose are formed. The end surface 243 of the pinion gear 24 toward the motor body 22 is a flat surface orthogonal to the axis C of the rotating shaft 21.

Next, the operation of the present embodiment will be described with reference to FIGS. 1 and 4.
As described above, the stepping motor 2 undergoes a displacement that causes vibration due to its rotation / stop operation, which can be divided into two main components. One is the displacement due to the action / reaction of rotation, which depends on the moment of inertia of the rotational motion of the stepping motor 2, and is the displacement in the twisting direction that occurs in the direction indicated by the arrow R in FIG. The other is the displacement due to the linear action / reaction that occurs when the pinion gear 24 transmits the driving force to the driven gear (not shown), which is indicated by arrows S and T in FIG. It is a displacement in the direction of the gear that occurs in the direction. This displacement in the kojiri direction is defined as a sway centered on a point O on the rotation axis C.

Regarding the arrows S and T in FIG. 1, two types of directions, a solid line and a dotted line, are shown, and these directions depend on the positions where the pinion gear 24 and the driven gear come into contact with each other. For example, if the driven gear comes into contact with the pinion gear from the direction of arrow A in FIG. 1, the displacement in the kojiri direction is predominant in the vertical direction on the paper in FIG. 1, and therefore is displaced in the direction of arrow S shown by the solid line. Occurs. Assuming that the driven gear comes into contact with the pinion gear from the direction of arrow B, the displacement in the kojiri direction is dominant in the substantially left-right direction on the paper of FIG. 1, so that the displacement occurs in the direction of arrow T shown by the dotted line.

In the present embodiment, an elastic member connecting these plates is adopted between the first plate 11 and the second plate 12 in order to suppress vibration due to displacement in the twisting direction.
In order to suppress the displacement in the kojiri direction, a cylindrical portion 124 is provided on the second plate 12 fixed to the support 3, and a bearing 122 is provided in the cylindrical portion 124.

In the case of the conventional example of FIG. 4, there is a gap between the rotating shaft 21 and the second insertion portion 121, and when a displacement in the kojiri direction occurs, there is a mechanism for suppressing this displacement. Not. On the other hand, in the present embodiment, a cylindrical portion 124 is provided on the second plate 12 fixed to the frame (support) 3 of the device in this portion, and the bearing 122 rotates in the cylindrical portion 124. The shaft 21 is provided so as to be slidable.
Therefore, when a force in the twisting direction is applied to the rotating shaft 21, the bearing 122 acts to suppress the displacement of the axis C of the rotating shaft 21 and maintain the rotating shaft 21 in a fixed position, and the rotating shaft 21 acts with respect to the support 3. The displacement in the kojiri direction, that is, the swing of the rotating shaft 21 is suppressed.

As described above, since the mechanism of the bearing 122 can sufficiently suppress the displacement in the twisting direction, the hardness of the elastic member 13 can be determined mainly by considering the anti-vibration performance in the twisting direction. A sufficient effect can be obtained with respect to the vibration isolation performance in the twisting direction. In the case of FIG. 4 of the conventional example, the displacement in the twisting direction and the vibration isolation performance in the twisting direction are only adjusted by the hardness of the elastic member 13, and the relationship between them is a trade-off and the displacement in the twisting direction is suppressed. If this is to be done, the hardness of the elastic member 13 must be increased, and if the hardness is too high, the vibration isolation performance in the twisting direction deteriorates, which makes adjustment difficult. In the present embodiment, it is possible to solve this dilemma and obtain a sufficient effect of suppressing the displacement of twisting and twisting.

Therefore, according to the present embodiment, the vibration isolation performance in the twisting direction can be ensured and the displacement in the twisting direction can be sufficiently suppressed, so that the deterioration of the image quality due to the sound and vibration caused by the operation of the motor 2 can be suppressed. .. Since it is not necessary to change the structure of the elastic member as a countermeasure against displacement in the twisting direction, the durability of the elastic member is not impaired. Since the displacement in the twisting direction can be sufficiently suppressed, problems such as deterioration of the durability of the anti-vibration mount itself, generation of abnormal noise due to gear meshing, and displacement of the driven body can be solved. Therefore, it is possible to provide a vibration-proof mount for a motor with improved vibration-proof performance while ensuring durability.

(Second Embodiment)
FIG. 2 is a perspective sectional view showing a mounted state of the anti-vibration mount 300 according to the second embodiment of the present invention. The present embodiment will be described in terms of differences from the first embodiment, and the same reference numerals will be used for those having the same configuration, and the description thereof will be omitted.
The difference between this embodiment and the first embodiment is the configuration of the bearing 301 of the vibration isolation mount 300. The bearing 301 has a bearing body 302 that supports the rotating shaft 21, and a flange 303 that is connected to one end of the bearing body 302 and extends radially outwardly orthogonal to the axis C of the rotating shaft 21. The tip of the rotating shaft 21 is provided with a pinion gear 24 (motor drive transmission member) having an end surface 243 in a direction orthogonal to the axis C. Here, the flange 303 is configured to be in contact with the end surface 243 of the pinion gear 24.
According to the present embodiment, since the bearing 301 includes the flange 303 and the flange 303 is in contact with the end surface 243 of the pinion gear 24, the motor 2 is centered on one point on the axis C of the rotating shaft 21. The rocking is further suppressed. That is, the effect of suppressing the displacement in the kojiri direction can be further increased. Therefore, in addition to the effect of the first embodiment, the durability of the anti-vibration mount 300 can be further improved, and vibration, misalignment, and the like can be suppressed.

(Third Embodiment)
FIG. 3 is a perspective sectional view showing a mounted state of the anti-vibration mount 400 according to the third embodiment of the present invention. The present embodiment will be described in terms of differences from the first embodiment, and the same reference numerals will be used for those having the same configuration, and the description thereof will be omitted.
The difference between this embodiment and the first embodiment is the configuration of the bearing 401 of the vibration isolation mount 400. The bearing 401 has a bearing body 402 that supports the rotating shaft 21, and a flange 403 that is connected to one end of the bearing body 402 and extends radially outwardly orthogonal to the axis C of the rotating shaft 21. The motor main body 22 has an end surface 223 in a direction orthogonal to the axis C on the side where the rotating shaft 21 protrudes. Here, the flange 403 is configured to be in contact with the end surface 223 of the motor main body 22.
According to the present embodiment, since the bearing 401 is provided with the flange 403 and the flange 403 is in contact with the end surface 223 of the motor body 22, the center is centered on one point on the axis C of the rotating shaft 21 of the motor 2. The swinging is further suppressed. That is, the effect of suppressing the displacement in the kojiri direction can be further increased. Therefore, in addition to the effect of the first embodiment, the durability of the anti-vibration mount 400 can be further improved, and vibration, misalignment, and the like can be suppressed.

In the above three embodiments, the pinion gear 24 is used as the motor drive transmission member, but the present invention is not limited to this, and other mechanisms such as a pulley may be adopted.

1, 100, 300, 400 Anti-vibration mount 11 1st plate 111 1st insertion part 12 2nd plate 121 2nd insertion part 122, 301, 401 Bearing 113, 123 Plate part 124 Cylindrical part 13 Elastic member 2 Motor 21 Rotating shaft 22 Motor body 223 End face of motor body 24 Motor drive transmission member (pinion gear, pulley)
243 Pinion gear end face 3 Support (frame of equipment to which the motor is attached)
302, 402 Bearing body 303, 403 Flange C axis

Claims (6)

A first plate having a first insertion portion through which the rotation shaft of the motor is inserted, and the rotation shaft protruding in one direction from the first insertion portion and attached to the motor body.
A second plate having a second insertion portion through which the rotation shaft is inserted, and having the rotation shaft inserted through the insertion portion and arranged to face the first plate,
An elastic member that connects the first plate and the second plate is provided.
The second plate is a vibration-proof mount for the motor that is attached to a support that supports the motor.
A vibration-proof mount for a motor, characterized in that a bearing for the rotating shaft is provided inside the second insertion portion. The second plate includes a plate portion attached to the support and a cylindrical portion that rises from a peripheral portion of the second insertion portion formed in the plate portion, and the bearing is provided in the cylindrical portion. The anti-vibration mount for a motor according to claim 1, wherein the motor is provided. The anti-vibration mount for a motor according to claim 2, wherein the second plate has a cylindrical portion formed by burring with respect to the plate portion. The tip of the rotating shaft is provided with a motor drive transmission member having an end surface in a direction orthogonal to the axis of the rotating shaft, and the bearing is connected to a bearing body that supports the rotating shaft and one end of the bearing body. 1 to 3, wherein the bearing is provided and has a flange extending outward in the radial direction orthogonal to the axis, and the flange is brought into contact with the end face of the motor drive transmission member. Anti-vibration mount for the motor according to any one item. The motor body has an end surface in a direction orthogonal to the axis of the rotation shaft on the side where the rotation shaft protrudes, and the bearing is connected to a bearing body that supports the rotation shaft and one end of the bearing body. 1. Any one of claims 1 to 3, wherein the flange has a flange extending outward in the radial direction orthogonal to the axis, and the flange is brought into contact with the end face of the motor body. Anti-vibration mount for the motor described in section. The anti-vibration mount for a motor according to any one of claims 1 to 5, wherein the bearing is a resin slide bearing.

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