JP3017924B2 - Motor anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an anti-vibration device for a fan motor used for an electric device such as a room air conditioner. The present invention relates to an anti-vibration rubber mounting structure that reliably prevents removal from a case of a motor or rotation in a circumferential direction, thereby improving reliability of mounting accuracy.

[0002]

2. Description of the Related Art In recent years, various types of home electric appliances in which an electric motor is directly incorporated in equipment such as a room air conditioner have become widespread, and these electric appliances have low noise, It is desirable that the vibration be low. The noise and vibration are caused by electromagnetic force generated due to unevenness of a narrow gap between the stator core of the motor and the rotor, and vibration caused by imbalance of the rotor.
In most cases, it is caused by transmission from a bearing to a case to an electric device through a mounting portion between the case and the device.
For this reason, recently, in order to reduce noise and vibration of electric equipment such as a room air conditioner having a built-in electric motor, a ring-shaped anti-vibration rubber is fitted around the outer periphery of the bearing insertion tube of the motor case, and the vibration-proof rubber is interposed therebetween. The electric motor was attached to the electric equipment.

[0003] An example of an electric motor to which the vibration isolating rubber is attached will be described with reference to FIGS. 9 to 11. In FIG. 9, reference numeral 1 denotes an electric motor, and reference numerals 2 and 2a denote a pair of cases formed by pressing a steel plate or the like into a bowl shape by pressing or the like. Bearing insertion cylinders 3 and 3a for insertion are extruded integrally with the cases 2 and 2a. Reference numeral 6 denotes an anti-vibration rubber fitted to the outer circumference of the bearing insertion cylinders 3 and 3a of the cases 2 and 2a by press-fitting means such as a press. As shown in FIGS. 9 and 10, a ring-shaped rubber base 6a and the rubber It is composed of metal inner and outer rings 6b and 6c attached to the inner and outer peripheral surfaces of the base 6a by vulcanization bonding means or the like, respectively. In addition,
In FIG. 9, reference numeral 7 denotes a mounting frame for the electric motor 1;
Are mounted on the mounting frame 7 via the vibration isolating rubber 6 fitted to the bearing insertion cylinders 3 and 3a, and a fixing bracket (not shown) for integrally fixing the mounting frame 7 and the vibration isolating rubber 6 together. As a result, the electric motor 1 is incorporated into an electric device such as a room air conditioner via the mounting frame 7.

[0004]

However, when the vibration isolating rubber 6 is mounted on the outer periphery of the bearing insertion cylinders 3 and 3a of the cases 2 and 2a of the electric motor 1 by press fitting as described above, the electric motor 1 is mounted. Attachment with frame 7 (vibration isolation rubber 6)
In order to prevent rocking due to the rotational torque during operation and dropping from the mounting frame 7, it is necessary to firmly hold the vibration-proof rubber 6 fitted to the bearing insertion cylinders 3, 3a. For this reason, for example, the inner ring 6b of the vibration isolation rubber 6 is used.
Is slightly smaller than the outer diameter of the bearing insertion cylinders 3 and 3a of the electric motor 1, and the vibration isolating rubber 6 is press-fitted into the bearing insertion cylinders 3 and 3a using a press or the like (not shown). However, in this case, the vibration isolating rubber 6 is connected to the bearing insertion tubes 3 and 3.
a, the bearing insertion cylinders 3 and 3a are subjected to compressive stress in the inward direction, and as shown in FIG. However, there is a problem that plastic deformation is caused and pursed.
As a result, after the anti-vibration rubber 6 is press-fitted into the bearing insertion cylinders 3 and 3a, the inner peripheral surface a of the bearing insertion cylinders 3 and 3a is cut using a lathe or the like to a position indicated by a two-dot chain line in FIG. Since post-processing must be performed so that the bearing 5 can be inserted, it takes time and effort to attach the vibration-proof rubber 6, which has been a major factor impeding the production efficiency of the electric motor 1.

[0005] Further, inner and outer rings 6b and 6c are attached to the inner and outer peripheral surfaces of the vibration isolating rubber 6, respectively, and the inner and outer rings 6b and 6c are integrated with the rubber base 6a. Since the joints (seams) are not formed due to the fact that they are vulcanized and bonded, the expansion and contraction (elasticity) of the vibration-proof rubber 6 is greatly impaired by the presence of the inner and outer rings 6b and 6c. When a dimensional error occurs between the bearing insert cylinders 3 and 3a, the vibration isolating rubber 6 is removed from the bearing insert cylinders 3 and 3a.
There is also a problem that it cannot be mounted on the vehicle. Moreover, the inner and outer rings 6b and 6c are connected to the rubber base 6a.
The inner and outer rings 6b and 6c contact the cases 2 and 2a, and the vibration of the electric motor 1 causes the vibration of the inner and outer rings. 6b, 6c → there is a possibility of being directly transmitted to an electric device such as a room air conditioner through the mounting frame 7.

In order to solve the above-mentioned problem, instead of the vibration isolating rubber 6 having the inner and outer rings 6b and 6c on the inner and outer peripheral surfaces of the rubber base 6a, only the vibration isolating rubber is used for the bearing insertion tube 3, 3
Although it is conceivable that the bearing insertion cylinders 3 and 3a are prevented from being plastically deformed when the vibration isolating rubber is fitted, the vibration absorbing rubber and the bearing inserting cylinder 3 may be fitted. , 3a only uses the elastic force of the vibration isolating rubber and does not have any special fixing means.
May swing at the attachment portion (vibration-proof rubber portion) with the attachment frame 7 or fall off from the attachment frame 7. For this reason, it takes a lot of trouble and time to attach the anti-vibration rubber, for example, it is necessary to fix the anti-vibration rubber and the bearing insertion cylinders 3 and 3a using an adhesive or the like. Was difficult to improve.

SUMMARY OF THE INVENTION In view of the above-mentioned various problems, the present invention provides a method of inserting a vibration-proof rubber into a bearing by a simple mounting structure without post-processing the bearing insertion tube or bonding the vibration-proof rubber by an adhesive means. An object of the present invention is to provide a vibration damping device for an electric motor, which is mounted on a cylinder and reliably prevents the electric motor from swinging at a mounting portion with the mounting frame and falling off from the mounting frame.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bottomed cylindrical case for housing a motor body in which a rotor is rotatably inserted into a stator core around which a coil is wound. In the central portion on the bottom inside of each of the brackets attached to the open end of the case, a bearing insertion cylinder is used by effectively utilizing the dead space in the case and the bracket, and the outside of the bottom of the case and the bracket. At the center, a mounting cylinder for mounting the vibration isolating rubber is integrally formed, and on the outer peripheral surface of the mounting cylinder, a plurality of fan-shaped protrusions and recesses are alternately formed in the radial direction. At the same time, a concave groove is provided between the projection and the bottom surface of the case and the bracket along the outer periphery of the mounting cylinder. Further, the vibration-proof rubber attached to the mounting cylinder is provided with a metal ring on its outer peripheral surface so as to cover almost half in the axial direction, and on the inner peripheral surface,
In a state where a flange portion that engages with the concave groove of the mounting cylinder is cut off at one end in the axial direction, a plurality of engaging portions with which the protrusions of the mounting cylinder engage outward are formed in a concave shape, and Projections for dividing the joint into a plurality of sections are provided to project inward. Then, the protrusions, recesses, and grooves on the mounting cylinder side are engaged with the engaging portions, protrusions, and flanges on the vibration isolating rubber side, and the vibration isolating rubber is attached to the mounting cylinder. The operation of the apparatus is as follows.

[0009]

According to the present invention, as described above, the mounting cylinder is projected from the center of each of the bottom surfaces of the case and the bracket, and the projection, the concave portion and the groove formed on the outer peripheral side of the mounting cylinder are prevented. By engaging the engaging portion, the protrusion, and the flange formed on the inner peripheral side of the vibration rubber with each other, the vibration-proof rubber is attached to the mounting cylinder to form the vibration-proof device, so that the vibration-proof device is formed. The anti-vibration rubber can be attached to the case or the mounting cylinder of the bracket with a simple structure without using a fixing means such as an inner ring or an adhesive, and as a result, the anti-vibration rubber is mounted in the circumferential direction of the mounting cylinder. To prevent the vibration generated during the operation of the electric motor from propagating to the electrical equipment such as the room air conditioner. Can be.

[0010] Further, since the vibration isolating rubber is configured to be attached to a mounting cylinder protruding from the center of the bottom of the case and the bracket separately from the bearing insertion cylinder, as in the prior art,
After the rubber bearing is press-fitted and fitted to the outer circumference of the bearing insertion cylinder via the inner ring, there is no need to cut the inner peripheral surface of the bearing insertion cylinder with a lathe or the like, so the motor is efficiently produced. be able to. In addition, since there is no need to attach an inner ring to the inner peripheral surface of the anti-vibration rubber, even if there is some dimensional error between the anti-vibration rubber and the mounting cylinder, the elasticity of the anti-vibration rubber can be used effectively In addition, there is an advantage that the vibration-proof rubber can be fixed and held in the mounting cylinder in a satisfactory manner.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3, reference numeral 10 denotes an electric motor, 11 denotes a case of an electric motor 10 formed in a bottomed cylindrical shape by aluminum die-casting or the like, in which a rotor is rotatably mounted on a stator core having a coil (not shown) wound thereon. The inserted motor body is housed. 11a is a bracket attached to the open end of the case 11. The case 11 and the bracket 1
As shown in Figs. 2 and 4,
By effectively utilizing the dead space in the case 11 and the bracket 11a, the bearing insertion tubes 14, 14a for inserting the bearings 13 press-fitted into the rotor shaft 12 face the inside of the electric motor 10 and the bottom surfaces of the case 11 and the bracket 11a. The bearing insertion tube 1 is formed integrally with the case 11 and the bracket 11a at the center of the bottom surface outside.
As shown in FIGS. 2 to 4, hollow mounting tubes 15, 15 for mounting a vibration-proof rubber, which will be described later, on the outer circumferential surface side are provided at positions corresponding to the bearing insertion tubes 14, 14 a at positions corresponding to the bearing insertion tubes 14, 14 a.
4a, the case 11 and the bracket 11a are formed integrally with the bottom of the case 11 and the bracket 11a.
Each of them protrudes horizontally outside.

The mounting tubes 15, 15 (hereinafter referred to as case 11)
Since the mounting cylinder 15 on the side 11 and the mounting cylinder 15 on the side of the bracket 11a have the same structure, only the mounting cylinder 15 on the side of the case 11 will be described.) As shown in FIGS. A cylindrical body 15a integrally protruding outward from the case 11 and the like, and a predetermined width dimension along the axial direction on the outer peripheral surface of the cylindrical body 15a, and in the circumferential direction. A plurality of (six in the present invention) projecting protruding portions 15b having a predetermined width and having a wide width in the circumferential direction.
And a narrow recess 15c formed between the projections 15b, 15b #, and a predetermined width dimension between the bottom of the case 11 or the like and the projection 15b, communicating with the recess 15c. And a concave groove 15d provided around the outer periphery of the cylindrical body 15a.

Next, reference numeral 16 denotes a mounting cylinder 1 such as the case 11 or the like.
The detailed structure of the vibration-proof rubber to be mounted on 5 will be described with reference to FIGS. In FIGS. 5 to 7, reference numeral 16a denotes a ring-shaped rubber base which is a main component of the vibration-isolating rubber 16, and an outer peripheral ring 17 made of metal is provided on the outer peripheral surface thereof.
6a is vulcanized and adhered to and integrally formed with the rubber base 16a. As shown in FIGS. 5 and 6, the outer peripheral ring 17 has a width dimension that covers about half of the outer peripheral surface of the rubber base 16a, and forms a peripheral groove 17a at a central portion in the width direction thereof;
Free ends b, b are provided at a constant interval at the end of the peripheral groove 17a, and are vulcanized and bonded to the outer periphery of the rubber base 16a.

Further, on the inner peripheral surface of the rubber base 16a,
As shown in FIGS. 5 and 7, a flange 16 d that engages with the concave groove 15 d of the mounting cylinder 15, and the inner peripheral surface is outwardly formed with the flange 16 d left (remaining) at one end in the axial direction. An engaging portion 16b that engages with a plurality of protrusions 15b of the mounting tube 15 that is concavely formed in the direction, and the engaging portions 16b can be individually partitioned (the same number as the protrusions 15b of the mounting tube 15). A plurality of projections 16c are formed integrally with the recessed portion 15c of the mounting tube 15 protruding so as to form the same surface as the flange 16d inward at a predetermined interval. . In addition,
As shown in FIG. 5, a rubber base 16 is provided on the flange 16d.
A notch 16e is formed at a position substantially coinciding with the free ends b, b of the outer peripheral ring 17 attached to the outer peripheral surface of a.

In FIGS. 2 and 3, reference numeral 18 denotes a mounting frame for mounting the electric motor 10 to an electric device such as a room air conditioner, which is formed in a U-shape from a steel plate or the like. The part is formed with a pair of claw portions 18a, 18a protruding outward. Reference numeral 19 denotes a pair of arc-shaped fixing brackets for fixing the electric motor 10 to the mounting frame 18, and one end (lower side of FIG. 2) of the mounting frame 18 is provided at one end thereof.
Window holes 19a that engage with the claw portions 18a, 18a of
On the other end (upper side in FIG. 2), a flange piece 19b for tightening the fixing brackets 19 is formed.

Next, a case where the electric motor 10 is assembled will be described. First, a stator core around which a coil (not shown) constituting a motor body is wound is inserted into the case 11 (the right side in FIG. 2). Thereafter, the vibration isolating rubbers 16 and 16 are attached to the mounting cylinders 15 and 15 of the case 11 and the bracket 11a, respectively. When mounting the vibration isolating rubber 16 on each of the mounting cylinders 15 of the case 11 and the bracket 11a, as shown in FIG.
With the inner peripheral surface of the vibration isolating rubber 16 expanded outward by an insertion jig (not shown), the mounting cylinder 15 such as the case 11 is
To the side. At this time, the expansion operation of the vibration-proof rubber 16 is hindered by the free ends b, b of the outer peripheral ring 17 attached to the outer peripheral surface thereof and the notch 16e formed in the flange 16d of the inner peripheral surface. Without using the elasticity of the rubber itself, the inner peripheral surface can be expanded and the rubber can be smoothly and favorably inserted into the outer periphery of the mounting cylinder 15.

After the rubber cushion 16 is inserted into the outer periphery of the mounting tube 15, the rubber cushion 16 is turned clockwise or counterclockwise as shown in FIG.
2, the protrusion 15 b of the mounting cylinder 15 and the vibration isolating rubber 1
The engaging portion 16b, the concave portion 15c of the mounting cylinder 15 and the projection 16c of the vibration isolating rubber 16 are engaged with each other, and the operation of attaching the vibration isolating rubber 16 to the mounting cylinder 15 is completed. The flange 16d of the rubber cushion 16 is automatically engaged with the groove 15d when the rubber cushion 16 has been inserted into the mounting tube 15.
When the vibration-proof rubber 16 is inserted into the mounting cylinder 15 after the positioning of the engaging portion 16b and the projection 15b of the mounting cylinder 15 in advance at the time of insertion, the concave portion 15c and the projection 16c are formed.
Also, the positioning is automatically performed, and the vibration-proof rubber 16 can be easily attached to the attachment cylinder 15.

After the vibration-proof rubber 16 has been mounted on the mounting cylinders 15, 15 of the case 11 and the bracket 11a as described above, the bearings 13, 1 are mounted on the rotor shaft 12 of a rotor (not shown).
3 and insert this rotor into the core insertion hole of the stator core in the case 11, and at the same time, insert one of the bearings 13 attached to the rotor shaft 12 into the bearing insertion tube 14, and then the bracket 11a. Of the rotor shaft 1
The other bearing 13 attached to 2 is inserted. Then, when the bearings 13 and 13 are inserted into the bearing insertion cylinders 14 and 14a of the case 11 and the bracket 11a, a flange 11 formed on each opening side of the case 11 and the bracket 11a.
b, 11b are fastened to each other by a fastening member c such as a screw,
The assembling work of the electric motor 10 ends.

Next, the electric motor 1 assembled as described above
A case in which 0 is attached to the attachment frame 18 via the rubber cushion 16 will be described. When the electric motor 10 is mounted on the mounting frame 18, first, as shown in FIGS.
Is provided on a peripheral groove 17a provided on an outer peripheral ring 17 of the vibration isolating rubber 16.
Then, the electric motor 10 is mounted on the mounting frame 18 by engaging an arc-shaped mounting portion 18b formed on the upper edge of the open end of the mounting frame 18 as shown in FIG. Subsequently, a pair of arc-shaped fixing brackets 19, 19 are placed on the outer peripheral surface of the vibration-isolating rubber 16 so as to surround the outer peripheral surface, and a window hole 19a formed in one end of the fixing brackets 19, 19 is formed. Next, as shown in FIG. 2, the claw portions 18a formed on both sides of the open end of the mounting frame 18 (both sides of the mounting portion 18b shown in FIG. 3) are locked. 19b, 1 formed at the other end of
9b are fastened together using bolts d and nuts e, so that the vibration-proof rubber 16 is attached to the mounting frame 18 and the fixing fitting 1.
9 and the electric motor 10 is fixed to the mounting frame 18. Thereafter, by fixing the mounting frame body 18 to an electric device such as a room air conditioner using a fastening member such as a screw,
The electric motor 10 can be attached to an electric device such as a room air conditioner via an attachment frame 18.

When the electric motor 10 mounted on the mounting frame 18 as described above is operated, vibration caused by electromagnetic force generated in a narrow gap between a stator core (not shown) and the rotor, Although vibrations due to imbalance are transmitted to the rotor shaft 12 → the bearing 13 → the case 11 and the bracket 11 a, the vibration is caused by the vibration-proof rubber 16 attached to the mounting cylinders 15, 15 of the case 11 and the bracket 11 a.
And is not easily transmitted to electric equipment such as a room air conditioner via the mounting frame 18. Further, the outer peripheral ring 1 attached to the outer peripheral surface of the vibration isolating rubber 16.
7 covers only about half of the width of the anti-vibration rubber 16 (the front end side of the mounting tube 15).
Even if contacts the case 11 and the bottom surface of the bracket 11a, the vibration of the electric motor 10 is only absorbed by the vibration-proof rubber 16 and does not propagate to electric equipment such as a room air conditioner.

Further, when the motor 10 is started or operated, a mounting portion (the vibration isolating rubber 16) between the motor 10 and the mounting frame 18 is provided.
Even if the rotational torque is transmitted to the portion (11), the vibration isolating rubber 16 is attached to the case 11 and the bracket 11a of the electric motor 10.
Projections 15b, recesses 15c of the mounting cylinders 15, 15
The engaging portion 16b and the projection 16c provided on the vibration isolating rubber 16 side
Are individually engaged and mounted, the elastic torque is utilized to absorb the rotational torque, and the electric motor 10 does not swing at all. Further, since the vibration isolating rubber 16 is attached to the mounting cylinder 15 in a state where the flange 16 d is engaged with the concave groove 15 d of the mounting cylinder 15, the electric motor 10 is detached from the vibration isolating rubber 16. Also, it does not fall off the mounting frame 18 at all.

Although the present invention has been described with reference to the embodiment in which the mounting cylinder 15 for mounting the anti-vibration rubber 16 is formed on each of the bottom surfaces of the case 11 and the bracket 11a so as to protrude outward, the present invention is not limited to this. Alternatively, the present invention can be realized even if end brackets are attached to both sides of the frame in which the stator core is inserted, or mounting cylinders are provided on the bottom surfaces of a pair of cases, respectively, to attach vibration isolating rubber. .

[0023]

As described above, according to the present invention, a bearing insertion tube for inserting a bearing is formed inside both ends of the motor in the axial direction, and a vibration isolating rubber is provided on the outside corresponding to the bearing insertion tube. Since the mounting cylinder for mounting is formed integrally with the bearing insertion cylinder, the anti-vibration rubber can be mounted on the mounting cylinder provided separately from the bearing insertion cylinder.
Since the adverse effects (deformation of the bearing insertion tube and the like) caused by press-fitting the vibration-proof rubber into the bearing insertion tube as in the related art can be reliably prevented, the productivity of the electric motor can be remarkably improved.

Also, a plurality of projections, recesses, and grooves are formed on the outer peripheral surface of the mounting cylinder, and the anti-vibration rubber provided on the mounting cylinder has a plurality of An engaging portion, a projection, and a flange are formed, and the corresponding engaging portion, projection, and flange of the anti-vibration rubber are engaged with the protruding portion, the concave portion, and the concave groove of the mounting cylinder, respectively. Since the rubber is attached to the mounting cylinder, a metal ring is attached to the inner peripheral surface of the anti-vibration rubber or an adhesive is applied to prevent the vibration of the anti-vibration rubber, etc. There is no necessity, and the vibration-proof rubber is securely attached to the mounting cylinder with a simple structure to prevent the motor from oscillating due to the rotational torque and coming off the mounting frame, and from the rotor to the rotor. Good absorption of vibrations propagated through the shaft
The vibration can be mitigated and the vibration can be prevented from propagating to an electric device such as a room air conditioner.

Further, the outer ring is attached to the outer peripheral surface of the outer peripheral surface so as to cover only about half of the axial direction of the anti-vibration rubber (the front end side of the mounting cylinder). Even when it comes in contact with the bottom of the case, there is no outer ring on the bottom side of the case of the vibration isolating rubber, so that the vibration of the electric motor is transmitted to the electrical equipment such as the room air conditioner via the outer ring as in the past. There is nothing at all, and the vibration can be reliably absorbed by the vibration-proof rubber.

The vibration-proof rubber is formed by forming an engaging portion, a projection, and a flange on the inner peripheral surface thereof and mounting an outer peripheral ring having a free end at one end of the outer peripheral surface. Therefore, unlike the conventional case, the elasticity of the rubber is not hindered at all by the inner and outer rings having no free end. There is also an advantage that the elasticity can be effectively used to quickly and surely attach to the mounting cylinder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an anti-vibration rubber of the present invention is attached to a case of an electric motor.

FIG. 2 is a side view of the electric motor to which the anti-vibration rubber of the present invention is attached, with a main part cut away.

FIG. 3 is a front view showing an electric motor to which the vibration damping rubber of the present invention is attached.

FIG. 4 is a perspective view showing a main part of the case with a cutout.

FIG. 5 is a plan view showing an anti-vibration rubber of the present invention.

FIG. 6 is a vertical sectional side view taken along the line II of FIG. 5;

FIG. 7 is a perspective view showing a main part of the vibration-proof rubber cut away.

FIG. 8 is an explanatory diagram for explaining an operation of attaching a vibration-proof rubber to a case.

FIG. 9 is a cutaway side view showing a main part of a conventional electric motor to which a vibration-proof rubber is attached.

FIG. 10 is a plan view showing a conventional anti-vibration rubber.

FIG. 11 is an enlarged vertical sectional side view showing a state immediately after a conventional vibration-proof rubber is attached to a case.

[Explanation of symbols]

 Reference Signs List 10 Motor 11 Case 11a Bracket 14 Bearing insertion tube 15 Mounting tube 15b Projection 15c Depression 15d Recessed groove 16 Anti-vibration rubber 16b Engagement portion 16c Projection 16d Flange 16e Notch 17 Outer ring 18 Mounting frame 19 Fixing bracket b Free end

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/00-5/24

Claims (2)

(57) [Claims] 1. An anti-vibration device for mounting and supporting an electric motor on a mounting frame via anti-vibration rubber attached to both ends in an axial direction of the electric motor. Along with forming the insertion cylinder, a mounting cylinder for mounting a vibration-proof rubber is formed integrally with the bearing insertion cylinder on the outside of the bottom surface of the case or the like corresponding to the bearing insertion cylinder,
The mounting cylinder is a hollow cylindrical cylinder, and an outer peripheral surface of the cylinder.
Fan-shaped protrusions that are provided in the circumferential direction at predetermined intervals
A recess, a recess formed between the projections, and a
Around the outer circumference of the mounting cylinder between
A vibration isolator for an electric motor, comprising: 2. An anti-vibration rubber to be attached to the mounting cylinder,
Rubber base, and the rubber base on the outer peripheral surface of the rubber base.
An outer peripheral ring attached while leaving a part of the base;
Attachment formed at one end in the axial direction on the inner peripheral surface of the body
With the flange engaged with the concave groove of the cylinder, and with this flange left uncut,
The inner peripheral surface of the rubber base is recessed and
A mating engagement portion, and a concave portion of the mounting cylinder which partitions the engagement portion.
2. The vibration isolator for an electric motor according to claim 1, wherein the vibration isolator is configured by a protrusion protrudably provided so as to be engageable with the motor.