JP3376712B2 - Motor mounting structure of air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor mounting structure for an air conditioner.

[0002]

2. Description of the Related Art As a general mounting structure of a motor for driving a fan of an air conditioner, for example, an actual Kaihei 2-70116 is used.
As disclosed in Japanese Patent Publication No. JP-A-2004-242242, a plate material is bent into a U-shape so that the central portion thereof serves as a fastening and fixing portion for the casing, and the tip ends of the fastening and fastening portion are located opposite to each other on the left and right sides. A motor base is used as a supporting part provided with a motor receiving part having a semicircular cutout on the side, and both ends of the motor are fitted into the pair of left and right motor receiving parts of the motor base, and the motor is Hook a curved band on the receiving part,
It is known that the band and the motor receiving portion support the motor by tightening the band.

On the other hand, among the air conditioners, there is a demand to keep the thickness (height) of the casing low, especially in the case of a ceiling suspension type or a buried type air conditioner.
There are relatively few dimensional restrictions in the horizontal direction (width direction),
Rather, in an air conditioner that tends to positively increase the widthwise dimension from the viewpoint of blowing out the conditioned air from a wide range along the ceiling surface, for example, actual Kaihei 1-1368.
As disclosed in Japanese Patent No. 17, a multi-blade fan whose diameter can be reduced is often used as the fan.
Also, when adopting such a multi-blade fan, since the multi-blade fan sucks air from its axial direction and blows it out in the radial direction, when it is composed of a single multi-blade fan Since there is a large deviation in the amount of air blown out in the axial direction, in order to avoid this, a method is adopted in which multiple multi-blade fans with short axial lengths are arranged in rows at a prescribed interval and these are driven by a single motor. Is the conventional general method. Then, in this case, as disclosed in the above-mentioned publicly known example, when a plurality of multi-blade fans are attached, a rotating shaft of a predetermined length is coaxially connected to the motor shaft through a coupling, and the rotating shaft is rotated. A plurality of multi-blade fans are fixed to the shaft at predetermined intervals, and the other end of the rotary shaft is supported by a bearing provided on the casing side.

[0004]

However, when the motor is mounted on the casing side using the motor base as disclosed in Japanese Utility Model Laid-Open No. 2-70116, there are the following problems. That is, first, when fixing such a motor base to the casing side by bolt fastening, there is no specific disclosure in this known example, but as a conventional general method, the fastening fixing portion of the motor base is used. A plurality of bolt holes are provided in and the fixing bolts are attached through these holes. And
In this case, it is customary to form each of the bolt holes as a so-called stupid hole having a relatively large gap with respect to the outer diameter of the fixing bolt. However, if all of the bolt holes are foolish holes in this way, even if the screw holes on the casing side and the bolt holes on the motor base side are slightly misaligned, this will be absorbed by the allowance for the foolish holes. Since it is possible to install the fixing bolt itself, it is easy to install the fixing bolt, but if the mounting position of the motor base remains misaligned with respect to the casing,
For example, in the structure in which the impeller is directly attached to the motor shaft and the fan case is fixed to the casing, the impeller may contact the fan case due to the inclination of the motor shaft. As disclosed in Japanese Patent Laid-Open No. 136817, in a case where a long rotary shaft is connected to a motor shaft and a plurality of multi-blade fans are arranged in parallel on the rotary shaft, the motor shaft is inclined due to the inclination of the motor shaft. It becomes difficult to connect the shaft to the rotary shaft, or the displacement at the shaft end of the rotary shaft becomes excessive, which makes it difficult to support the bearing. Therefore, in order to avoid such an inconvenience, it is necessary to temporarily fix the motor base to the casing and then finely adjust the mounting position, which results in complicated motor mounting work, which increases the man-hours and lengthens the work time. Causes a problem of increasing the production cost.

Secondly, the conventional motor base has a structure in which only the fastening and fixing portion is fixed to the casing side, and the support portions extending on both sides of the fastening and fixing portion are not fixed to the casing side. Therefore, the supporting portion is easily deformed in the plate thickness direction.
Therefore, for example, when the air conditioner is accidentally dropped during installation work, the supporting portion is deformed in the plate thickness direction due to the inertial force caused by the fall of the motor, the multi-blade fan, or the like. It is possible to do it. In such a case, there is a structure in which a plurality of multi-blade fans are attached via a rotary shaft and the shaft ends of the rotary shafts are supported by bearings as disclosed in Japanese Utility Model Laid-Open No. 1-136817. May cause the shaft end of the rotary shaft to be disengaged from the bearing due to the movement of the rotary shaft in the axial direction due to the deformation of the support portion. In this case, it is necessary to perform the work of mounting the rotary shaft again. However, the increase in the number of man-hours will increase the production cost.

In view of the above, the present invention proposes a motor mounting structure for an air conditioner, which improves workability in mounting the motor base and prevents the rotating shaft from being disengaged from the bearing. It is a thing.

[0007]

As specific means for solving such problems in the present invention SUMMARY OF], the first invention <br/> of the present patent application, as illustrated in FIGS. 1 and 2, the fan drive In an air conditioner in which a motor 2 for a vehicle is attached to a casing 1 via a motor base 30, the motor base 30 is fixed to the casing 1 by a fixed plate 31 and both left and right sides of the fixed plate 31. And a pair of left and right support plates 32, 32 which extend in a facing state at predetermined intervals and support both ends of the motor 2 in the axial direction, respectively. It is characterized in that it is fastened and fixed to the casing 1 side at the position.

In the second invention of the present application, in the motor mounting structure of the air conditioner according to the first invention , as shown in FIGS. 1 to 3, the fixing plate 3 of the motor base 30 is used.
1 is provided with a plurality of bolt holes for inserting fixing bolts, and among the plurality of bolt holes, the first bolt hole 41 is a small diameter hole capable of forming a minute gap with the outer circumference of the fixing bolt 46. In the direction orthogonal to the straight line L connecting the second bolt hole 42 and the first bolt hole 41, the second bolt hole 42 has a short diameter substantially the same as the diameter dimension of the first bolt hole 41. It has a feature that it is an elongated hole having a major axis larger by a predetermined dimension than the minor axis in a direction parallel to the straight line L.

In the third invention of the present application, the above-mentioned first or second
In the air conditioner motor mounting structure according to the invention of
As illustrated in FIGS. 1 and 2, a plurality of multi-blade fans 3, 3, ... Are attached to the motor shaft 17 of the motor 2 mounted on the casing 1 via the motor base 30.
Are coaxially connected to each other, and the other end of the rotary shaft 19 is supported by a bearing 20 fixed to the casing 1 side. .

[0010]

According to the present invention, the following actions and effects can be obtained by adopting such a configuration.

[0011]   Of the present applicationFirst inventionAir conditioner
In the above motor mounting structure,
The fixed plate 31 that is fastened and fixed to the single 1 and the fixed plate 31
Extend from the left and right sides facing each other with a predetermined interval
Left supporting each end of the motor 2 in the axial direction
It is composed of a pair of right support plates 32, 32, and
Place the pair of left and right support plates 32, 32 at a position near the tip thereof.
Since it is fastened and fixed to the casing 1 side,
As in the conventional case, the motor base 30 is located on the fixed plate 31 portion.
Fixed to the casing 1 side only, a pair of support plates 32, 3
2 when compared to casing 1 free
Then, in the plate thickness direction of the support plates 32, 32, that is, in the motor 2.
The rigidity in the axial direction is improved and the motor base 3
Dispersion of the load applied to 0 to the casing 1 side is promoted.
And the plate thickness of the casing 1 can be reduced accordingly.
It will be possible, and eventually the weight reduction of the air conditioner will be promoted.
It is a thing.

[0012]   Of the present applicationSecond inventionAir conditioner
With the motor mounting structure ofThe effects described above can be obtained.
In addition to the above, the following unique effects can be obtained. That is, this
Of the invention, the motor base 30 is fixed to the casing 1.
Of the plurality of bolt holes provided on the surface, the first bolt hole 41
Can form a minute gap with the outer circumference of the fixing bolt 46.
A small-diameter hole is formed, and the second bolt hole 42 is formed into the second bolt hole 4
2 is orthogonal to the straight line L connecting the first bolt hole 41 and
The diameter of the first bolt hole 41 in the direction Almost the same as law
It has a short diameter of one dimension, and in the direction parallel to the straight line L,
A long hole with a major axis larger than the minor axis by a specified dimension
The motor base 30 is attached to the casing 1.
When working, first fix the fixing bolt 4 in the first bolt hole 41.
By screwing 6 together, the first bolt hole 41 portion is firmly fixed.
Since there is little play with the constant bolt 46, the first bolt hole
Accurate positioning of the 41 part is performed. Following this
Screw the fixing bolt 46 into the second bolt hole 42.
And in the direction orthogonal to the straight line L of the second bolt hole 42.
Since there is little play with the fixing bolt 46,
One orthogonal to the straight line L in the second bolt hole 42 portion
Accurate directional positioning is achieved. Therefore, the motor base 30
Positioning in a direction parallel to the straight line L when viewed as a whole
Is a fixing bolt attached to the first bolt hole 41.
In the direction orthogonal to the straight line L.
The positioning is performed by the first bolt hole 41 and the second bolt hole 42.
With two fixing bolts 46 attached to each
Accurate results in two plane directions.
By arranging it, the casing of the motor stand 30 can be
The mounting position relative to it will be accurately specified. Also,
Even if the other bolt holes are foolish holes,
It cannot be a cause of displacement of the mounting position of the table 30.

Therefore, as in the conventional motor mounting structure,
Fine adjustment of the mounting position after temporarily fixing the table 30
There is no need to do so, and motor installation work is simple and easy.
Quicker, improving workability in motor assembly work
However, it can also contribute to lower production costs.
is there.

[0014]   Of the present applicationThird inventionAir conditioner
For the motor mounting structure ofFirst or second inventionThat of
With respect to each of the configurations, the motor shaft 17 of the motor 2 is
A plurality of multi-blade fans 3, 3, ...
When one end of the fixed rotating shaft 19 is coaxially connected
The other end of the rotary shaft 19 is fixed to the casing 1 side.
The bearing 20 is provided with a supporting structure.
From the aboveOrThe effects described in are obtained.
In addition to the above, the following unique effects can be obtained
Is.

That is, firstly, in a structure in which a plurality of multi-blade fans 3, 3, ... Are mounted via the rotary shaft 19, the influence of the displacement of the mounting position of the motor base 30 with respect to the casing 1 is affected. Is conspicuous on the other end side of the rotary shaft 19 having the longest distance from the motor base 30, and it may happen that the other end of the rotary shaft 19 cannot be supported by the bearing 20 in some cases. Since the accurate positioning of the motor base 30 is reliably achieved by the structure of the bolt holes as described above, the situation in which the rotation shaft 19 cannot be supported is reliably avoided.

Second, for example, if the air conditioner is accidentally dropped at the time of mounting work, a large load due to the drop inertia of the motor 2, the rotary shaft 19 and the like causes a great load on the motor base 30.
However, in this case, each of the support plates 32, 32 is connected to the casing 1 and has a high rigidity in the plate thickness direction and can be deformed. Since the configuration is suppressed, the displacement of the rotary shaft 19 in the axial direction is small, and therefore the rotary shaft 19 is prevented from coming off the bearing 20.
As a result, for example, even when the air conditioner is dropped, extra work such as reassembling of the rotary shaft 19 is unnecessary, so that the workability of assembling is improved, and the rotary shaft 19 is separated from the bearing 20. The operational reliability of the air conditioner can be ensured without the occurrence of the situation of operating the air conditioner in the above condition.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor mounting structure for an air conditioner according to the present invention will be specifically described below with reference to the accompanying drawings. 1 to 3
Is a ceiling suspension type (so-called ceiling suspension type) as an air conditioner having a motor mounting structure according to an embodiment of the present invention.
1 shows a main part of the air conditioner Z, and in each of the drawings, reference numeral 1 is a casing constituting an outer shell of the air conditioner Z, and the casing 1 is roughly divided and is located closer to the room in its installed state. A bottom plate 11 and a top plate 12 positioned near the ceiling 10, a pair of left and right side plates 13 and 13 connecting the bottom plate 11 and the top plate 12, and a back plate 15, and the back plate 15 and a casing at a predetermined interval. A partition plate 14 is provided so as to partition the inside of the vehicle 1 in the front-rear direction. A suction port 8 is formed at a position of the bottom plate 11 of the casing 1 corresponding to the portion surrounded by the back plate 15 and the partition plate 14, and a filter 9 is attached to the suction port 8. . Further, an air outlet 7 is formed on the surface of the casing 1 facing the back plate 15, and a heat exchanger 6 is arranged in an inclined state between the air outlet 7 and the partition plate 14. .

On the other hand, the back plate 15 of the casing 1
In the space between the partition plate 14 and the partition plate 14,
And a plurality (4 in this embodiment) of multi-blade fans 3, 3, ...
・ Is placed. That is, the motor 2 is fixedly supported on the casing 1 side via a motor base 30 described later, and motor shafts 16 and 17 are provided on both left and right sides in the axial direction thereof. And one motor shaft 16
The impeller 4 of the multi-blade fan 3 including the impeller 4 and the fan case 5 is directly attached to the. On the other hand, one end of a rotary shaft 19 having a predetermined length is coaxially connected to the other motor shaft 17 via a coupling 18, and the other end of the rotary shaft 19 is fixed to the casing 1. The bearing 20 is rotatably supported. Then, three multi-blade fans 3, 3, 3 are fixed to the rotary shaft 19 at a predetermined interval in the axial direction, and these three multi-blade fans 3, 3, 3 and the motor shaft 16 side are provided. The attached multi-blade fan 3 is rotationally driven integrally by the motor 2.

Each fan case 5 of each multi-blade fan 3, 3, ... Is attached to the partition plate 14 with its outlet 5a oriented toward the heat exchanger 6 side.

The motor base 30 is, as shown in FIG.
A plate member is bent into a substantially U shape, and a portion located at the center in the bending direction is a fixing plate 31,
A pair of left and right portions, which extend continuously in the right and left sides of the fixed plate 31 and extend in the orthogonal direction and face each other at a predetermined interval, are referred to as support plates 32 and 32, respectively. The fixed plate 31 of the motor base 30 is the partition plate 14 of the casing 1.
It is a fastening and fixing part for the
As shown in FIG. 5, a pair of left and right bolt seat portions 36, 36, ... Are formed on both upper and lower ends thereof, respectively.
And, these four bolt seats 36, 36, ...
Bolt holes 41 through which fixing bolts 46 are respectively inserted and arranged
44 to 44 are formed, the structure of each of the bolt holes 41 to 44 is set as follows in this embodiment.

That is, the bolt seat portion 3 located at the lower end on the right side
The first bolt hole 41 (corresponding to the first bolt hole in the claims) formed in 6 is a circular hole having a loose eye for the fixing bolt 46. Bolt seat portion 36 in which the first bolt hole 41 is formed
The second bolt hole 42 (corresponding to the second bolt hole in the claims) formed in the bolt seat portion 36 located diagonally with respect to the second bolt hole 42 and the first bolt hole is formed. A long hole having a long axis in a direction parallel to the straight line L ₁ connecting to the bolt hole 41 is used, and the short diameter (that is, the dimension in the direction orthogonal to the straight line L ₁ ) is the inner diameter of the first bolt hole 41. And the major axis (that is, the straight line L above)
The dimension in the direction parallel to ₁ ) is set to a dimension at which the fixing bolt 46 can be loosely fitted. Further, the third bolt hole 43 and the fourth bolt holes 4 respectively formed on the two bolt seat portion 36, 36 positioned on both sides of the straight line L ₁
Reference numeral 4 denotes a stupid hole having an inner diameter capable of loosely fitting the fixing bolt 46 together.

Further, the pair of left and right support plates 32, 32
A semicircular cutout that opens forward is provided at the tip of the bush receiving portion 33, and the band catching portions 3 are provided at the upper and lower ends of the bush receiving portion 33, respectively.
4, 34 are formed. In addition, the support plates 32, 32
An upper end side of the extension portion 38 is an extension portion 38 extending upward, and a bolt seat portion 37 is provided at an upper end of the extension portion 38. Further, one end of each of a pair of upper and lower tightening bands 23 and 24 each having a curved band shape can be hooked to each of the band hooking portions 34 and 34, respectively.

In the motor 2, the bosses 21 and 21 located at both ends in the axial direction are attached to the pair of tightening bands 23,
24 and the bush receiving portion 33 of the support plate 32, which are sandwiched by the bush 22 respectively, so that the motor base 30
The motor 2 is mounted on the motor base 30 after first mounting the motor base 30 on the partition plate 14 of the casing 1.

Here, the mounting work of the motor base 30 to the partition plate 14 of the casing 1 will be described. The fixing plate 31 of the motor base 30 is abutted against the partition plate 14, and the top plate 12 is also attached. Against the support plate 3
The bolt seat portions 37, 37 on the 2, 32 side are abutted against each other. In this state, first, the fixing work on the fixing plate 31 side is performed. That is,
First, the fixing bolt 46 is passed through the first bolt hole 41 and screwed to the partition plate 14 side. In this way, when the fixing bolt 46 is attached to the first bolt hole 41, the first bolt hole 41 has a loose fit with respect to the fixing bolt 46, and therefore the motor base 30 has the first bolt hole 41.
The portion is accurately positioned at an appropriate position and can be rotated about the fixing bolt 46 in that state.

Next, the fixing bolt 46 is passed through the second bolt hole 42, which is an elongated hole, and is screwed to the partition plate 14 side. Then, the second bolt hole 42 is set such that its short axis is orthogonal to the straight line L ₁ connecting the first bolt hole 41 and the second bolt hole 42, and the short diameter thereof is the first bolt hole 41. Since it is set so as to have a loose eye for the fixing bolt 46 in the same manner as,
The fixing bolt 46 inserted into the second bolt hole 42 restricts the rotation of the motor base 30 about the first bolt hole 41. Therefore, the motor base 30 is defined by the fixing bolts 46 and 46 respectively inserted in the first bolt hole 41 and the second bolt hole 42 in the direction orthogonal to the straight line L _1, and the straight line L ₁ is defined. _The direction parallel to 1 is defined by the fixing bolt 46 inserted in the first bolt hole 41. In this way, the motor base 30 is accurately positioned in the two orthogonal directions in the plane direction of the fixing plate 31 and the displacement thereof is restricted, so that the motor base 30 is attached to the partition plate 14 as designed. It will be set accurately.
After that, the fixing bolts 46 and 46 are respectively inserted into the two stupid holes, that is, the third bolt hole 43 and the fourth bolt hole 44, and these are screwed to the partition plate 14 side. This completes the work of fixing the fixing plate 31 to the partition plate 14.

Next, the operation of fixing the supporting plates 32, 32 will be described. In this case, the bolt seat portions 37, 37 of the supporting plates 32, 32 have already been fixed by fixing the fixing plate 31 side.
Since the mounting position of the above with respect to the top plate 12 is defined, these bolt seats 37, 37 are simply fixed to the fixing bolts 4.
It may be fastened to the top plate 12 side with 7, 47. This completes the work of mounting the motor base 30 on the casing 1 side.

As described above, in this embodiment, the fixing plate 31 is tightened by the fixing bolts 46 in a predetermined order, so that the motor base 3 can be automatically and accurately.
Since the positioning of 0 with respect to the partition plate 14 is performed, fine adjustment of the mounting position of the motor base 30 after the temporary fixing is completely unnecessary, as in the conventional case where all the bolt holes are foolish holes. Therefore, the mounting work of the motor base 30 becomes simple and quick, and the mounting workability is good. In addition, the motor base 30
If the positioning of the
If the motor 2 is attached to the motor 2 and the plurality of multi-blade fans 3, 3, ... Are connected to the motor 2 directly or via the rotary shaft 19, the multi-blade fans 3, 3 ,. 2 and all are located coaxially. Therefore, as in the conventional case, the impeller 4 of the multi-blade fan 3 and the fan case 5 are in contact with each other, or the end of the rotary shaft 19 cannot be supported by the bearing 20. To be avoided.

On the other hand, as described above, the motor base 30 is fixed to the casing 1 side not only on the fixed plate 31 but also on the support plates 32, 32 side. As compared with the case where the side is not fixed to the casing 1 side, the rigidity of the support plates 32, 32 in the plate thickness direction is increased and the dispersion of the load applied to the motor base 30 to the casing 1 side is promoted. To be done. As a result, first, due to the increased rigidity of the support plates 32, 32, the support plates 32, 32 are erroneously dropped during the mounting work of the air conditioner Z, and an excessive load is applied to the support plates 32, 32 in the plate thickness direction. Even if the support plates 32, 32
Deformation in the plate thickness direction is suppressed as much as possible. Therefore, the axial displacement of the rotary shaft 19 is also suppressed, and the rotary shaft 1
It is possible to reliably prevent the occurrence of a situation in which the end of 9 falls off from the bearing 20.

Further, by promoting the dispersion of the load, it becomes possible to reduce the plate thickness of the partition plate 14 as compared with the case where the motor base 30 is supported only by the partition plate 14, for example, and the air conditioning is as much as that. The weight of the machine Z can be reduced.

In this embodiment, the second bolt hole 42 located diagonally with respect to the first bolt hole 41 serving as the mounting reference of the fixing plate 31 is an elongated hole. The bolt hole at any position may be an elongated hole, and the point is to set the long axis of the elongated hole in a direction parallel to the straight line connecting the bolt hole and the first bolt hole 41 serving as a reference. For example, as shown in FIG. 5, when the first bolt hole 41 is used as the reference hole and the third bolt hole 43 is used as the elongated hole, the major axis thereof may be set parallel to the straight line L _2. In addition, when the fourth bolt hole 44 is an elongated hole, its major axis may be set parallel to the straight line L ₃ . The number of bolt holes does not have to be four as in this embodiment, but may be at least two.

[Brief description of drawings]

FIG. 1 is a bottom view of a ceiling-mounted air conditioner having a motor mounting structure according to an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view on arrow III-III in FIG.

4 is an exploded perspective view of the motor base shown in FIG.

5 is a view on arrow V in FIG. 4. FIG.

[Explanation of symbols]

1 is a casing, 2 is a motor, 3 is a multi-blade fan, 4 is an impeller, 5 is a fan case, 6 is a heat exchanger, 7 is an outlet,
8 is a suction port, 9 is a filter, 10 is a ceiling, 11 is a bottom plate, 12 is a top plate 1, 13 is a side plate, 14 is a partition plate 1, 15
Is a back plate, 16 and 17 are motor shafts, 18 is a coupling, 19 is a rotary shaft, 20 is a bearing, 21 is a boss, 22 is a bush, 23 and 24 are tightening bands, 25 is a tightening bolt, 30 is a motor. Table, 31 is a fixed plate, 32 is a support plate, 3
3 is a bush receiving portion, 34 is a band hooking portion, 36 and 37.
Is a bolt seat portion, 38 is an extension portion, 41 to 45 are bolt holes,
46 and 47 are fixing bolts.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-82054 (JP, A) Actual flat 4-107507 (JP, U) Actual flat 2-701116 (JP, U) Actual flat 1- 136817 (JP, U) Actual opening 62-76823 (JP, U) Actual opening 56-90617 (JP, U) Actual opening Flat 6-40723 (JP, U) Actual opening Sho 50-106951 (JP, U) 59-51023 (JP, U) Hei 2-92099 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 1/00 321 H02K 5/00 F24F 1 / 02 331 F24F 1/00 401 F24F 1/02 411 H02K 5/00 F24F 1/00 321

Claims (3)

(57) [Claims] 1. An air conditioner comprising a fan driving motor (2) mounted on a casing (1) through a motor base (30), wherein the motor base (30) is fastened to the casing (1). A fixed plate (31) fixedly mounted and fixed, and a pair of left and right supports extending from both left and right sides of the fixed plate (31) in a state of being opposed to each other at a predetermined interval and supporting both axial ends of the motor (2). It is composed of plates (32) and (32), and the pair of left and right support plates (32) and (32) are fastened and fixed to the casing (1) side at positions near their tips. The air conditioner motor mounting structure. 2. The motor base (3) according to claim 1 ,
0) has a plurality of bolt holes (41 to 44) for inserting fixing bolts in the fixing plate (31), and the first bolt hole (4) among the plurality of bolt holes (41 to 44).
1) is a small diameter hole capable of forming a minute gap between the fixing bolt (46) and the outer periphery of the fixing bolt (46), and the second bolt hole (42) is the second bolt hole (42) and the first bolt hole (42). In the direction orthogonal to the straight line (L) connecting the bolt hole (41), the minor axis has a dimension substantially the same as the diameter dimension of the first bolt hole (41), and in the direction parallel to the straight line (L). Is a slotted hole having a major axis larger than the minor axis by a predetermined dimension, and is a motor mounting structure for an air conditioner. 3. The multi-blade fan according to claim 1, wherein the motor shaft (17) of the motor (2) mounted to the casing (1) via the motor base (30) has a plurality of blades. .. (3), (3), ... Are arranged side by side at a predetermined interval in parallel, and one end of a rotary shaft (19) is coaxially connected, and the other end of the rotary shaft (19) is connected to the casing (1). ) Side is supported by a bearing (20) fixed to the air conditioner motor mounting structure.