JPH1118351A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress motor output shaft run-out by simple structure of a motor, by rotatably covering the whole of the output shaft protruding from an outer shell except the shaft end side, with a protective sleeve integrally formed with the outer shell of a motor at the adjacent position. SOLUTION: A shaft hole 5 for protruding an output shaft 3 to the outside is formed on one side of an outer shell element 4. The inside of the shaft hole 5 is surrounded by a bearing accommodating part 6, and the outside is surrounded by a protective sleeve 7 extruding in the shaft direction. The protective sleeve 7 is a cylinder whose inner diameter is slightly larger than the outer diameter of the output shaft 3 and integrally molded with the outer shell 1. The part of the output shaft 3 which protrudes from the outer shell 1 is rotatably covered with the protective sleeve 7, leaving the shaft end side to which an impeller as an object to be driven is installed. A protrusion 8 in the vicinity of the output shaft 3 is formed around the output shaft 3 on the inner periphery of the protruding end of the protective sleeve 7. As a result, the run-out of the output shaft of a motor wherein the output shaft 3 protrudes long is enabled by the simple structure of a motor itself.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor in which an output shaft extends from a bearing mounted on an outer shell to a long outside of the outer shell, and a motor having an outer shell formed by casting or die casting.

[0002]

2. Description of the Related Art Some electric motors have an output shaft extending long from an outer shell. For example, in an electric motor for rotating an impeller in a cross flow fan, as shown in FIG. 10, a motor 33 for oscillating an electric component 31 and an impeller casing 32 by using a space formed by elongating an output shaft 30 is used. Some incorporate a dynamic mechanism. The configuration of such an electric motor is not limited to a blower, but is also found in various devices. For example, JP-A-53-44963 discloses that
A device for rotating an impeller in a refrigerator with a motor mounted outside the refrigerator is shown, and a motor having a long output shaft is used to penetrate through a heat insulating wall. If the output shaft is long, if the external force is applied to the output shaft during transportation or the like, the output shaft will swing or bend, and if a strong external force is applied, the output shaft will be plastically deformed.

The motor disclosed in the above publication has a structure for preventing such shaft runout. That is, the output shaft protruding from the outer shell of the motor is inserted through the guide portion provided on the heat insulating wall.
The guide portion is formed in a cylindrical shape, and a protrusion for preventing the output shaft from oscillating is provided on the inner wall of the end portion.

[0004]

In the conventional motor having a long output shaft as described above, the steadying of the output shaft by a guide portion is performed by passing the output shaft through a partition wall in a blower motor as shown in the drawing. However, the present invention cannot be applied to an electric motor in which a driven body such as an impeller is directly mounted on the shaft end side. Apart from this problem, in the case of an electric motor having an outer shell made of casting or die-casting, the outer shell is often composed of a two-part assembly of a frame and a bracket or a three-part assembly of two end brackets and a frame. The cost of the shell is high because it is constructed and the individual parts are manufactured separately.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention according to claims 1 and 2 that the output shaft is long. It is an object of the present invention to provide a motor having a simple structure of the motor itself to prevent the output shaft of the protruding motor from oscillating. It is an object of the invention according to claims 4 to 8 to achieve a reduction in cost while performing the steady rest by a simple structure of the electric motor itself. To improve the assemblability of the outer shell of the electric motor, and to obtain an electric motor having an outer shell with a small deviation of the axial center.

[0006]

According to a first aspect of the present invention, an output shaft extends long from an outer shell to the outside of the outer shell, and the output shaft is driven by a shaft end of the extended output shaft. Means is employed for covering the entire motor except the shaft end side of the output shaft protruding from the outer shell with a protective sleeve integrally formed on the outer shell of the electric motor to be mounted on the motor so as to be rotatable at a close position.

In order to achieve the above object, a second aspect of the present invention provides a means for providing a projection near an output shaft near an output shaft at an end of a shaft end side of the protective sleeve in the means according to the first aspect. adopt.

According to a third aspect of the present invention, the outer shell of the means according to the first or second aspect is divided into two equal parts by a line perpendicular to the output shaft. And a means for forming the outer shell by facing and joining two types of outer shell elements facing each other.

According to a fourth aspect of the present invention, there is provided an electric motor having an outer shell formed by casting or die-casting, wherein the outer shell is divided into two equal parts by a line perpendicular to the output shaft. Means for forming the outer shell by joining the two outer shell elements of the above-mentioned elements face-to-face.

In order to achieve the above object, the invention according to claim 5 employs means for providing a fitting structure at a symmetrical position of a mating surface for joining outer shell elements of the outer shell element in the means according to claim 4. I do.

In order to achieve the above object, a sixth aspect of the present invention adopts a means in which the fitting structure in the fifth aspect is a projection and a concave portion in which the projection is fitted.

In order to achieve the above object, the invention according to claim 7 employs a means in which the fitting structure in the means according to claim 5 is a ridge and a groove into which the ridge is fitted.

In order to achieve the above object, the invention according to claim 8 is characterized in that the means according to any one of claims 3 to 7 includes an integral mounting leg on a part of the outer periphery of the outer shell element,
Means for providing a fitting structure at a symmetrical position on the surface of the mounting leg facing the surface is adopted.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. Embodiment 1 FIG. An outer shell 1 of the electric motor of the first embodiment shown in FIGS. 1 to 7 is for an electric motor for rotating an impeller 2 in a cross flow fan as shown in FIG. Is applied to a motor that extends for a long time. The outer shell 1 of the electric motor is formed by casting or aluminum die-casting, and is configured by facing and joining two kinds of outer shell elements 4 divided into two equal parts by a line perpendicular to the output shaft 3. I have. Outer shell element 4
Has a shaft hole 5 formed on one side thereof to extend the output shaft 3 to the outside. The inside of the shaft hole 5 is surrounded by a bearing housing 6, and the outside is surrounded by a protective sleeve 7 extending in the axial direction. The protective sleeve 7 is formed integrally with the outer shell 1 as a cylindrical portion having an inner diameter slightly larger than the outer diameter of the output shaft 3. As shown in FIG. 3, the output shaft 3 is rotatably covered with a portion protruding from the outer shell 1 as shown in FIG. 3 except for a shaft end side on which the impeller 2 as a driven body is mounted. On the inner periphery of the protruding end of the protective sleeve 7, a projection 8 is provided around the output shaft 3 and close to the output shaft 3.

The outer shell element 4 is formed with two mounting legs 9 for mounting the electric motor, which are arranged in the circumferential direction so as to protrude in the radial direction. As shown in FIGS. 4 and 5, the mating surface 10 of the outer shell element 4 has a pair of fitting structures formed by protrusions 11 and concave portions 12 symmetrically with respect to the center line of the outer shell element 4. As shown in FIGS. 6 and 7, the fitting structure includes a ridge 13 that forms an arc in the circumferential direction and a groove 14 into which the ridge 13 fits.
May be configured. Near the mating surface 10 of the outer shell element 4, flanges 16 having bolt insertion holes 15 for fastening bolts are provided at three places in the circumferential direction in a state where the outer shell elements 4 are joined at the mating surface 10. ing.

The outer shell 1 of the electric motor is formed by opposing one kind of outer shell elements 4 to each other, butting the mating surfaces 10 to form a mating structure, and fastening the flanges 16 to each other with bolts. Be composed. The output shaft 3 of the motor is drawn out through the protective sleeve 7, and a driven body such as the impeller 2 is attached to each exposed shaft end. That is, the outer shell 1 of the electric motor can be manufactured with one type of mold, and the outer shell elements 4 can be positioned with each other by assembling the fitting structure formed on the mating surface 10 even during assembly. This can be easily performed without using any of the above. Further, since the outer shell 1 is composed of four kinds of outer shell elements, the mounting surface of the mounting leg 9 can be easily provided with flatness, and the axial center is less likely to be displaced. Since the output shaft 3 extending from the outer shell 1 for a long time is almost entirely covered by the protective sleeve 7, even if an external force is applied during transportation or the like, the output shaft 3 is prevented from swinging by the inner surface of the protective sleeve 7, It does not bend. In particular, the output shaft 3
, The slight deflection of the output shaft 3 is also restricted. By forming the protective sleeve 7 integrally with the outer shell 1 as described above, the configuration is simpler than the case where the protective sleeve 7 is integrally formed on the outer shell 1 and restrained by a separate member, and the assembly becomes easier.

The protective sleeve 7 is formed of the outer shell 1 having a divided structure.
The output shaft 3 can also be provided as described above in a motor in which the output shaft 3 extends to only one side. Further, the present invention can be applied to an electric motor as a drive source of various devices whose driven body is not the impeller 2.

Embodiment 2 FIG. 8 and 9 show the outer shell of the electric motor according to the second embodiment. As can be seen from the figure, the outer shell 1 of this electric motor also has the same basic configuration as the outer shell 1 of the electric motor shown in the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

The outer shell 1 of the electric motor includes the outer shell element 4 and the fitting structure provided on the mating surface 10 described in the first embodiment.
The mounting legs 9 are provided at symmetrical positions on the surfaces facing each other. The fitting structure includes a projecting portion 17 and a concave portion 18 fitted to the projecting portion. The projecting portion 17 is provided at a position symmetrical with respect to the center line of the outer shell element 4. A concave portion 18 is provided on the side of the mounting leg 9. Thereby, the same effect as the effect of the fitting structure of the first embodiment can be obtained, and in particular, the flatness of the mounting surface of the mounting leg 9 can be more easily obtained. Of course, the outer shell 1 provided with the fitting structure of the mating surfaces 10 described in the first embodiment may be configured.

[0020]

As described above, according to the first and second aspects of the present invention, the output shaft of the motor whose output shaft protrudes long can be stabilized by the simple structure of the motor itself. it can.

According to the third aspect of the present invention, the output shaft of the motor whose output shaft protrudes long can be stabilized by the simple structure of the motor itself, and the outer shell can be formed by two types of outer shell elements. Therefore, cost reduction can be achieved.

According to each of the fourth to eighth aspects of the present invention, the cost of the outer shell of the motor can be reduced, and the assemblability and assembling accuracy of the outer shell of the motor can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outer shell element of a motor according to a first embodiment.

FIG. 2 is a side view of the outer shell element of FIG. 1;

FIG. 3 is a sectional view of the outer shell element of FIG. 1;

FIG. 4 is a side view of the mating surface side of the outer shell element of FIG. 1;

5 is a perspective view of the outer shell element of FIG. 1 as viewed from the mating surface side.

FIG. 6 is a side view on the mating surface side of another outer shell element of the first embodiment.

7 is a perspective view of the outer shell element of FIG. 6 as viewed from the mating surface side.

FIG. 8 is a side view of the mating surface side of the outer shell element according to the second embodiment.

9 is a perspective view of the outer shell element of FIG. 8 as viewed from the mating surface side.

FIG. 10 is a front view showing a motor of a conventional blower.

[Explanation of symbols]

1 outer shell, 2 impeller, 3 output shaft, 4 outer shell element, 7 protective sleeve, 8 protrusion, 9 mounting leg,
10 mating surface, 11 protrusion, 12 recess, 1
3 ridges, 14 grooves, 17 protrusions, 18 recesses.

Claims (8)

[Claims] An electric motor in which an output shaft extends from an outer shell and extends outside the outer shell, and a driven body is mounted on a shaft end side of the extended output shaft. An electric motor in which the entire portion of the output shaft protruding from the outer shell except the shaft end side is rotatably covered at a close position by a sleeve. 2. The electric motor according to claim 1, wherein a projection is provided around an output shaft at an end on the shaft end side of the protective sleeve, the protrusion being close to the output shaft. 3. The electric motor according to claim 1, wherein the outer shell is divided into two equal parts by a line perpendicular to the output shaft, and is constituted by casting or die casting. An electric motor in which the outer shell is formed by joining two outer shell elements of each other facing each other. 4. An electric motor having an outer shell made of casting or die-casting, wherein the outer shell is bisected by a line perpendicular to an output shaft, and two types of outer shell elements are opposed to each other. An electric motor joined to form the outer shell. 5. The electric motor according to claim 4, wherein a fitting structure is provided at a symmetric position of a mating surface for joining the outer shell elements to each other. 6. The electric motor according to claim 5, wherein the fitting structure is a projection and a concave portion into which the projection is fitted. 7. The electric motor according to claim 5, wherein the fitting structure is a ridge and a groove into which the ridge is fitted. 8. The electric motor according to claim 3, wherein the outer shell element has an integral mounting leg on a part of the outer periphery thereof, and the outer surface of the mounting leg has An electric motor with a fitting structure at symmetrical positions.