Rotating electric machines

Abstract

In order to suppress the deformation of a bearing cover and facilitate the attachment of a fitting component, the rotating electric machine according to the present invention comprises a stator having a bracket and a rotor disposed with a predetermined gap interposed between the stator and the rotor in the radial direction and having a shaft, wherein the rotor is rotatably supported via a bearing. The rotating electric machine is characterized in that: the bearing is supported from the outside in the axial direction (thrust direction) by a bearing presser support fixed to the bracket; the outside of the bearing in the axial direction and the bearing presser support are covered with a bearing cover fixed to the bracket; and the bearing cover and the bearing presser support are separately supported to the bracket.

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine, and more particularly to a rotating electric machine, such as an electric motor, having an improved bearing support structure. [Background technology]

[0002] As an example of a rotating electrical machine having a conventional bearing, Patent Document 1 describes an electric motor.

[0003] In the electric motor described in Patent Document 1, the axial direction of the bearing (thrust direction ) External support is provided by a bearing cover bolted to the bracket. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-166748 Summary of the Invention [Problem to be solved by the invention]

[0005] Normally, a bearing cover is installed to protect the bearing by covering the outer side of the bearing in the thrust direction. of outside To the side To prevent the bearing from moving, the side of the bearing cover facing the bracket has a section that extends in the shaft direction (radially inward) to the outside of the bearing in the thrust direction. In other words, the part of the bearing cover on the outside of the bracket supports the bearing.

[0006] However, in the technology described in Patent Document 1 mentioned above, the bearing cover is attached to the bracket using bolts. However, since the outer diameter of the bearing varies from one bearing to another, when the bearing cover is used to support the outer side of the bearing in the thrust direction by tightening the bolts, the reaction force causes distortion in the bearing cover, resulting in deformation outward in the thrust direction.

[0007] In particular, when fitting parts are attached to the outer edge of the bearing cover, deformation of the bearing cover can make it difficult to attach the fitting parts.

[0008] SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a rotating electric machine in which deformation of the bearing cover is suppressed and fitting parts can be easily attached. [Means for solving the problem]

[0009] In order to achieve the above object, the rotating electric machine of the present invention is a rotating electric machine comprising a stator having a bracket, and a rotor having a shaft, which is disposed with a predetermined radial gap from the stator, and the rotor is rotatably supported via bearings, wherein the bearings are supported from the outside in the axial direction (thrust direction) by bearing holder supports fixed to the bracket, and the axial outside of the bearings and the bearing holder supports are covered by a bearing cover fixed to the bracket, and the bearing cover and the bearing holder supports are supported separately by the bracket, A second bearing cover is installed on the opposite side of the bracket from the side where the bearing cover is installed, and the bearing is supported by the second bearing cover from the inside in the axial direction (thrust direction) of the bearing, and the second bearing cover is fastened to the bracket by a bolt that fastens the bearing cover to the bracket. It is characterized by being fastened. [Effects of the Invention]

[0010] According to the present invention, deformation of the bearing cover is suppressed, and fitting parts can be easily attached. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of the upper half of a motor that is a first embodiment of a rotating electric machine according to the present invention. [Figure 2]FIG. 2 is an enlarged view of the vicinity of the bearing in FIG. 1. [Figure 3] 2. FIG. 4 shows a motor according to a second embodiment of the rotating electric machine of the present invention, and corresponds to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The rotating electrical machine will be described below based on the illustrated embodiment. In each drawing, the same reference numerals are used for the same components. [Example]

[0013] 1 and 2 show a motor that is a first embodiment of the rotating electric machine of the present invention. Fig. 1 shows a cross section of the upper half of the motor that is the first embodiment of the rotating electric machine of the present invention, and Fig. 2 shows an enlarged view of the vicinity of the bearing in Fig. 1.

[0014] The electric motor is exemplified by an electric motor that is commonly used in general industry and utilizes rolling bearings.

[0015] As shown in FIG. 1, the electric motor of this embodiment comprises a stator 4 having a bracket, and of A rotor 3 having a shaft 2 and arranged with a predetermined gap in the radial direction. 、 and an axial direction of The rotor 3 is rotatably supported via bearings installed at both ends.

[0016] Specifically, in FIG. 1, the stator 4 of the electric motor is provided with a frame 1 on the outer periphery, with a space on each side in the longitudinal direction. Delivery It is placed there.

[0017] One longitudinal side of frame 1 is the load side, and the other side is the anti-load side, with the load side provided with an output shaft for outputting the rotational force of shaft 2 to the outside. On the load side, a load side bracket 5 having a load side bearing 7 at its center, a load side bearing cover 6, and a bearing presser support 8 are provided.

[0018] In this embodiment, as shown in Figure 2, the axial direction (thrust direction) of the load side bearing 7 is supported by the load side bracket 5 and a bearing presser support 8 fixed to this load side bracket 5, and the axial outer side of the load side bearing 7 and the bearing presser support 8 are covered by a load side bearing cover 6 fixed to the load side bracket 5, and the load side bearing cover 6 and the bearing presser support 8 are supported separately by the load side bracket 5.

[0019] The above-mentioned bearing holder support 8 is fastened to the load side bracket 5 with a first bolt 11 , and the load side bearing cover 6 is fastened to the load side bracket 5 with a second bolt 12 .

[0020] Furthermore, a gap G is formed between the bearing holder support 8 and the load side bearing cover 6 in the radial direction.

[0021] Furthermore, the load side bearing cover 6 has a crank structure, and one end of this crank structure load side bearing cover 6 is fixed to the load side bracket 5 with a second bolt 12, and the other end of the crank structure load side bearing cover 6 covers the bearing holder support 8.

[0022] Furthermore, a fitting part 9 is installed on the outside of the load side bearing cover 6, and this fitting part 9 is fastened to the load side bracket 5 with a third bolt 13 that is separate from the first and second bolts 11 and 12. In other words, the fitting part 9 is provided on the load side bearing cover 6 as a structure for transmitting the output of the electric motor of this embodiment to the outside.

[0023] In the configuration of this embodiment, the load side bearing 7 is fixed in the thrust direction by the load side bracket 5 and the bearing holder support 8. The bearing holder support 8 is attached to the load side bracket 5 by bolting using first bolts 11, and the load side bearing cover 6 is attached to the load side bracket 5 by bolting using second bolts 12.

[0024] In addition, a fitting part 9 that requires fitting is installed on the outside of the load side bearing cover 6, and this fitting part 9 is attached to the load side bracket 5 by bolting using a third bolt 13.

[0025] As a result, the load side bearing cover 6 does not deform, and the mating part 9, which is a separate part from the load side bearing cover 6, does not deform either, so the dimensions of the mating part 9 remain as designed, and it becomes possible to fit the mating part 9 with precise tolerances.

[0026] Furthermore, even if there is no mating part 9 on the outside of the load side bearing cover 6, the reaction force of the fastening force when the load side bearing cover 6 is fastened to the load side bracket 5 by the second bolt 12 will have less of an effect on the load side bearing cover 6 and the load side bracket 5.

[0027] Therefore, as in this embodiment, by separating (making separate) the load side bearing cover 6 and the bearing clamp support 8 when fixing the load side bearing 7 in the thrust direction, deformation of the load side bearing cover 6 when tightening the bolts can be suppressed, making it easier to install the mating parts 9.

[0028] In addition, the reaction force of the fixed load side bearing 7 of However, since a gap G is provided between the bearing support 8 and the load side bearing cover 6 in the radial direction, the reaction force when fixing the load side bearing 7 is not transmitted to the load side bearing cover 6 due to the gap G. the law of nature Therefore, the bearing holder support 8 is prevented from being distorted and deformed.

[0029] Therefore, according to this embodiment, there is an effect that deformation of the load side bearing cover 6 is suppressed and the fitting parts can be easily attached. [Example]

[0030] FIG. 3 shows a motor as a second embodiment of the rotating electrical machine of the present invention.

[0031] In the electric motor of this embodiment shown in Figure 3, a second load side bearing cover 10 is installed on the opposite side of the load side bracket 5 from the side on which the load side bearing cover 6 is installed, and this second load side bearing cover 10 and the bearing holder support 8 support the axial direction (thrust direction) of the load side bearing 7.

[0032] In addition, the second load side bearing cover 10 in this embodiment is fastened to the load side bracket 5 by the second bolts 12 that fasten the load side bearing cover 6 to the load side bracket 5 .

[0033] That is, in this embodiment, as another embodiment of axial (thrust) support for the load side bearing 7, the load side bearing 7 is fixed in the thrust direction by the second bearing cover 10 and the bearing presser support 8. Other configurations are the same as those in the first embodiment.

[0034] In this embodiment, the load side bearing 7 is fixed in the thrust direction by the load side bearing cover 6, the second load side bearing cover 10, and the bearing holder support 8, and by separating (separating) the load side bearing cover 6, the second load side bearing cover 10, and the bearing holder support 8, the effect of the reaction force caused by the bolt fastening of the load side bearing cover 6 can be prevented from reaching the second load side bearing cover 10.This is a major improvement in that it prevents deformation of the load side bearing cover 6 and prevents the effect of the reaction force caused by the bolt fastening of the load side bearing cover 6 to the second load side bearing cover 10 from reaching the second load side bearing cover 10.

[0035] Even with the configuration of this embodiment, the effects are the same as those of the first embodiment.

[0036] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0037] 1...frame, 2...shaft, 3...rotor, 4...stator, 5...load side bracket, 6...load side bearing cover, 7...load side bearing, 8...bearing retainer support, 9...mating part, 10...second load side bearing cover, 11...first bolt, 12...second bolt, 13...third bolt.

Claims

1. A rotating electric machine comprising: a stator having a bracket; and a rotor having a shaft, which is disposed with a predetermined gap in the radial direction from the stator, and the rotor is rotatably supported via bearings, The bearing is supported from the outside in the axial direction (thrust direction) by a bearing presser support fixed to the bracket, and the axial outside of the bearing and the bearing presser support are covered by a bearing cover fixed to the bracket, and the bearing cover and the bearing presser support are separately supported by the bracket, a second bearing cover is installed on the opposite side of the bracket from the side on which the bearing cover is installed, and the bearing is supported by the second bearing cover from the inside in the axial direction (thrust direction) of the bearing; The rotating electric machine according to claim 1, wherein the second bearing cover is fastened to the bracket by the bolts that fasten the bearing cover to the bracket.

2. 2. The rotating electric machine according to claim 1, a gap is formed between the bearing holder support and the bearing cover in the radial direction;

3. 3. The rotating electric machine according to claim 2, The bearing cover has a crank structure, one end of the crank structure bearing cover is fixed to the bracket with the bolt, and the other end of the crank structure bearing cover covers the bearing holder support.

4. 4. The rotating electric machine according to claim 3, A rotating electric machine characterized in that a mating part is installed on the outside of the bearing cover, and the mating part is fastened to the bracket with a bolt separate from the bolt.

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