Rotary electric machine and manufacturing method of rotary electric machine

Abstract

To provide a rotary electric machine which can easily perform assembly and disassembly and can suppress a rise of cost and to provide a manufacturing method of the rotary electric machine.SOLUTION: A rotary electric machine 1 includes: a bearing 6; a fixing metal fitting 7 to which the bearing 6 is assembled; and a bracket 8 having a storage part 82 for storing the fixing metal fitting 7. By storing the fixing metal fitting 7 in the storage part 82, a radial position of a metal fitting side hole part 72 for screwing is positioned within a prescribed range from a storage side hole part 85 on a bracket 8-side, and the bearing 6 is indirectly fixed by the fixing metal fitting 7 fixed to the bracket 8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotating electric machine and a method for manufacturing a rotating electric machine. [Background technology]

[0002] In conventional rotating electrical machines, a pressing plate for pressing the outer ring of the bearing may be provided as a separate member when fixing the bearing to a bracket, as in Patent Document 1. Hereinafter, such a configuration will be referred to as a conventional configuration for convenience. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 2-88444 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional configuration has a problem of poor assembly. Specifically, the retaining plate as a separate member is formed in a thin annular shape with a round hole in the center for passing the shaft member through, and the round hole is large enough to hold only the side of the outer ring of the bearing. Therefore, when fixing the bearing, it is necessary to insert, for example, a round rod-shaped jig into the screw-fastening hole, and align the holes with each other while the retaining plate is suspended in the air, and then screw it in, which makes assembly difficult, and this poor assembly leads to an increase in costs. In addition, the same problem occurs not only during assembly, but also when disassembling and restoring the rotating electric machine during inspection, so there is room for improvement in the conventional configuration.

[0005] In addition, in the case of the conventional configuration, the side of the outer ring of the bearing is clamped and held down by a pressure plate. As a result, when a circumferential force is applied, friction on the contact surface is reduced and the outer ring can rotate, which can lead to bearing malfunctions such as creep. In addition, if the contact surface of the bearing wears out after long-term use, it is necessary to replace the entire bracket, which also contributes to increased costs.

[0006] In view of this, there is provided a rotating electric machine that can be easily assembled and disassembled and that can suppress increases in costs, and a method for manufacturing the rotating electric machine. [Means for solving the problem]

[0007] The rotating electric machine of the embodiment comprises a bearing having an inner ring and an outer ring, a fixing bracket having an assembly hole portion into which the bearing is assembled and a plurality of fitting side hole portions for screwing formed around the assembly hole portion, and an accommodating portion for accommodating the fixing bracket, and a bracket having a plurality of accommodating side hole portions for screwing the fixing bracket, the fixing bracket being accommodated in the accommodating portion so that the position of the fitting side hole portion in the radial direction is positioned within a predetermined range from the accommodating side hole portion, and the bearing is indirectly fixed by the fixing bracket fixed to the bracket. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a rotating electric machine according to a first embodiment; [Diagram 2] Schematic diagram of a bearing [Diagram 3] Schematic diagram of the fixing bracket [Figure 4] Schematic diagram of the bracket [Diagram 5] A diagram showing part of the manufacturing process [Figure 6] FIG. 1 is a schematic diagram showing how each component is assembled during the manufacturing process; [Figure 7] FIG. 1 is a schematic diagram showing a fastener according to a second embodiment. [Figure 8]Schematic diagram of the fixing bracket, part 2 [Figure 9] FIG. 13 is a schematic diagram showing a fastening member according to a third embodiment; [Figure 10] FIG. 2 is a schematic diagram showing how the fixing bracket is attached; [Figure 11] Schematic diagram of other fixing brackets [Figure 12] FIG. 13 is a schematic diagram showing an assembly mode of a fixing bracket according to another embodiment; [Figure 13] Diagram showing other examples of fixing bracket shapes [Figure 14] A diagram showing an example of a fastening bracket with lightening processing [Figure 15] A schematic diagram showing the state in which the fixing bracket is attached to the front side DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a number of embodiments will be described with reference to the drawings. In addition, parts common to the embodiments will be described with the same reference numerals.

[0010] (First embodiment) Hereinafter, the first embodiment will be described. As shown in Fig. 1, a rotating electric machine 1 of this embodiment includes a case 2, a stator 3 fixed to the inner surface of the case 2, a rotor 4 arranged with a predetermined gap between it and the stator 3, and a shaft member 5 attached to the center of the rotor 4.

[0011] The shaft member 5 is rotatably supported by a bearing 6, and the bearing 6 is fixed to a fixture 7, and the fixture 7 is fixed by a bolt 9 to a bracket 8 that closes the opening of the case 2. Hereinafter, the center of rotation of the shaft member 5 will be referred to as the central axis (J1), the direction along the central axis (J1) will be referred to as the axial direction, the direction toward the right in the figure along the axial direction will be referred to as the load side, and the direction toward the left in the figure along the axial direction will be referred to as the anti-load side.

[0012] As shown in FIG. 2, the bearing 6 has a rolling element 63 between an inner ring 61 and an outer ring 62, and in this embodiment, it is configured as a ball bearing having a spherical rolling element 63. However, a roller bearing configured with a roller-shaped rolling element 63 can also be used as the bearing 6. Although a cage is not shown in FIG. 2, the bearing 6 may be configured without a cage. In this bearing 6, the diameter of the outer ring 62 is R1, the inside diameter of the inner ring 61 is R2, the width in the axial direction is W1, and the thickness in the radial direction of the outer ring 62 is D1. Hereinafter, the direction around the central axis (J1) is referred to as the circumferential direction, and the direction perpendicular to the central axis (J1) is referred to as the radial direction.

[0013] As shown in Fig. 3, the fixing bracket 7 is formed in a generally thick-walled cylindrical shape having an assembly hole 71 for assembling the bearing 6, and a plurality of bracket side holes 72 for screw fastening formed around the assembly hole 71, and has a square block-like cross section as shown in Fig. 1. The bracket side holes 72 are formed as so-called screw holes, and four of them are provided at equal intervals in the circumferential direction on an imaginary circumference whose distance from the central axis (J1) is L1, and are symmetrical in the left-right direction and up-down direction in the figure. However, the number and arrangement of the bracket side holes 72 are not limited to this, and a different number and arrangement may be used.

[0014] The fixing bracket 7 has an outer diameter of R11, an inner diameter, i.e., the diameter of the mounting hole 71, of R12, and a width in the axial direction of W11. The diameter (R12) of the mounting hole 71 is set to a size that allows the bearing 6 to be mounted by an interference fit. In this embodiment, the width (W11) of the fixing bracket 7 is set to be the same as the width (W1) of the bearing 6. It is sufficient that the width (W11) of the fixing bracket 7 is equal to or greater than the width (W1) of the bearing 6.

[0015] As shown in Fig. 4, the bracket 8 is formed in a generally bottomed cylindrical shape having a flange portion 81 that extends radially outward, and has an accommodation portion 82 that is a space for accommodating the fixing metal fitting 7. In the case of this embodiment, the accommodation portion 82 is provided as a space surrounded by an annular accommodation wall portion 83 that rises from the rear surface side of the bracket 8. Note that in Fig. 4, the accommodation wall portion 83 is hatched for ease of viewing.

[0016] The accommodation wall 83 has an inner diameter R21, which (R21) is set to be slightly larger than the outer diameter (R11) of the fixing bracket 7 and capable of accommodating the fixing bracket 7. Therefore, the fixing bracket 7 is accommodated between the accommodation wall 83 and the accommodation wall 83 at a predetermined distance, which is, for example, less than half the diameter of the bracket-side hole 72. The flange 81 is also provided with a plurality of fixing holes 84 for fixing the bracket 8 to the case 2.

[0017] The bottom surface of the bracket 8 is formed by a first bottom 86 in which accommodation side hole portions 85 for screwing the fixing metal fitting 7 are provided, and a second bottom portion 87 whose axial position is shifted in a stepped manner toward the load side from the first bottom portion 86. In this embodiment, the accommodation side hole portions 85 are through holes through which the bolts 9 are passed, and four accommodation side hole portions 85 are provided at equal circumferential positions corresponding to the metal fitting side hole portions 72. Each accommodation side hole portion 85 is provided at a position on an imaginary circumference that is spaced a distance L1 from the central axis (J1).

[0018] The first bottom 86 has a radial thickness D21 from the inner peripheral wall, and the thickness (D21) is approximately equal to the radial thickness of the fixing bracket 7 plus the thickness (D1) of the outer ring 62 of the bearing 6, and is formed to a size that does not reach the inner ring 61. The second bottom 87 has a radial thickness D22 from the inner peripheral wall, and is formed to a size that does not contact the shaft member 5 while extending to a position that covers the side surface of the inner ring 61 of the bearing 6. Therefore, a central opening 88 for passing the shaft member 5 is formed in the center of the second bottom 87. The diameter of this central opening 88 is R22, which is slightly larger than the diameter of the shaft member 5, and covers the side surface of the inner ring 61 of the bearing 6, that is, the rolling elements 63 of the bearing 6 are not directly exposed to the outside.

[0019] Next, the operation and effects of the above-mentioned configuration will be described. As described above, when providing a separate member on the rear side of bracket 8, it is difficult to align the positions of the screw holes, which makes assembly difficult and increases costs. Therefore, in this embodiment, the assembly and disassembly can be easily performed as described below, thereby suppressing increases in costs.

[0020] As shown in Fig. 5, which is an extracted portion of the manufacturing method of the rotating electric machine 1, in this embodiment, first, the bearing 6 and the fixing bracket 7 are assembled (S1). In this step, the bearing 6 is assembled into the assembly hole 71 of the fixing bracket 7 by an interference fit, as shown in the assembled state in Fig. 6. As a result, the bearing 6 is firmly fixed to the fixing bracket with the entire outer circumferential surface thereof in close contact with the fixing bracket.

[0021] Next, the bearing 6 fixed to the fixing bracket 7 is assembled to the shaft member 5 (S2). In this step, the shaft member 5 is press-fitted into the inner ring 61 of the bearing 6, as shown in the shaft assembled state in Fig. 6. As a result, the bearing 6 is assembled to the shaft member 5 together with the fixing bracket 7. It is assumed that the shaft member 5 is assembled to the rotor 4 before the process of step S2.

[0022] Next, the rotor 4 with the shaft member 5, bearing 6 and fixing bracket 7 attached to the shaft member 5 is placed in the case 2 (S3), and the bracket 8 is attached to the case 2, thereby housing the fixing bracket 7 in the housing section 82 (S4). At this time, the size of the housing section 82, i.e., the inner diameter (R21) of the housing wall 83, is set to be slightly larger than the outer diameter (R11) of the fixing bracket 7, so that by housing the fixing bracket 7 in the housing section 82, as shown in the housed state in Fig. 6, the fitting side holes 72 and the housing side holes 85 are located on an imaginary circumference having a distance L1 from the central axis. In other words, by housing the fixing bracket 7 in the housing section 82, the position of the fitting side hole 72 in the radial direction is positioned within a predetermined range from the housing side hole 85, and it becomes possible to screw it from the surface of the bracket 8.

[0023] Next, the holes are aligned in the circumferential direction (S5). In this step, the alignment is performed by rotating the shaft member 5 in the circumferential direction, as shown in the aligned state in Fig. 6. Specifically, the inner ring 61 of the bearing 6 rotates by rotating the shaft member 5, and the outer ring 62 also rotates in response together with the fixed fitting 7, thereby aligning the holes in the circumferential direction, and the fitting-side hole 72 and the accommodation-side hole 85 are in the same position in the radial and circumferential directions.

[0024] Then, with the holes aligned, the fixing bracket 7 is screwed to the bracket 8 (S6). As a result, the position of the bearing 6 is indirectly fixed via the fixing bracket 7 fixed to the bracket 8. At this time, the accommodation portion 82 is provided on the rear surface side of the bracket 8, and the fixing bracket 7 is accommodated in the accommodation portion 82 on the rear surface side of the bracket 8 and screwed from the front surface side of the bracket 8. Note that in a subsequent process, the bracket 8 is fixed to the case 2 and other operations are also performed.

[0025] According to the embodiment described above, the following effects can be obtained. The rotating electric machine 1 of this embodiment comprises a bearing 6 having an inner ring 61 and an outer ring 62, a fixing bracket 7 having an assembly hole portion 71 into which the bearing 6 is assembled and a plurality of fitting side holes 72 for screwing formed around the assembly hole portion 71, and a bracket 8 having an accommodating portion 82 for accommodating the fixing bracket 7 and a plurality of accommodating side holes 85 for screwing the fixing bracket 7, and by accommodating the fixing bracket 7 in the accommodating portion 82, the position of the fitting side hole portion 72 in the radial direction is positioned within a predetermined range from the accommodating side hole portion 85, and the bearing 6 is indirectly fixed by the fixing bracket 7 fixed to the bracket 8.

[0026] With this configuration, in this embodiment, it is possible to rotate both the bearing 6 and the fixed member in the circumferential direction by rotating the shaft member 5, so that after the fixing metal fitting 7 is accommodated, the position of the performance-stopping hole can be aligned by rotating the shaft member 5. Therefore, even when the fixing metal fitting 7 on the back side of the bracket 8 is screwed from the front side to the back side, there is no need to work with the members floating as in the past, and it is possible to easily fix the bearing 6 as well, greatly improving the ease of assembly and suppressing increases in costs due to poor assembly.

[0027] Furthermore, since the accommodation portion 82 is formed slightly larger than the fixing bracket 7, when the bracket 8 is assembled to accommodate the fixing bracket 7, the fixing bracket 7 can be guided by the accommodation wall portion 83, and no extra force is required for assembly, making it easy to assemble. Furthermore, in this embodiment, the fixing bracket 7 and the bearing 6 are assembled by an interference fit, so that the outer peripheral surface of the bearing 6 and the fixing bracket 7 are in close contact with each other, which has the effect of suppressing creep that would cause the outer ring 62 to rotate in the circumferential direction.

[0028] Furthermore, even if creep does occur, the fixing bracket 7 can be simply replaced, and since the ease of assembly allows the replacement work to be carried out efficiently, it is also possible to prevent an increase in running costs.

[0029] In addition, because the width (W11) of the fixing bracket 7 is the same as the width (W1) of the bearing 6, the entire outer peripheral surface of the outer ring 62 is in close contact with the fixing bracket 7, which is expected to further prevent creep. In addition, when the fixing bracket 7 is fixed to the bracket 8, the load-side side of the outer ring 62 of the bearing 6 comes into contact with the first bottom portion 86, as shown in Fig. 1. Therefore, if a thrust load is applied that tends to move the bearing 6 toward the load side, the movement of the bearing 6 is restricted by the first bottom portion 86, thereby improving resistance to thrust loads.

[0030] Furthermore, the side surface of the outer ring 62 of the bearing 6 comes into contact with the first bottom portion 86, which has the effect of suppressing the occurrence of creep. Since the fixing bracket 7 contributes greatly to preventing creep, even if creep does occur, it is not necessary to replace the bracket 8. By replacing the fixing bracket 7, inspection and repair can be performed, and an increase in costs can be suppressed.

[0031] In addition, a manufacturing method for the rotating electric machine 1 including the steps of assembling the bearing 6 and the fixing bracket 7 having an assembly hole 71 formed therein into which the bearing 6 is to be assembled, assembling the shaft member 5 and the bearing 6, accommodating the fixing bracket 7 together with the bearing 6 in the accommodating portion 82 formed in the bracket 8 and positioning the screw fastening holes formed in the fixing bracket 7 and the bracket 8 so that they are within a predetermined range in the radial direction, and indirectly fixing the bearing 6 by fixing the fixing bracket 7 to the bracket 8 can also greatly improve the ease of assembly and suppress increases in costs due to poor assembly, thereby achieving various effects similar to those of the embodiment.

[0032] Furthermore, the use of a jig can make the assembly even easier. For example, a rod-shaped jig having the same diameter as the bolt 9 and having a thread on one end can be attached to one of the metal fitting side holes 72, and in that state, the rod-shaped jig can be passed through the corresponding accommodation side hole 85 while assembling the bracket 8 to accommodate the fastening metal fitting. This allows the processes of steps S4 and S5 shown in Fig. 5 to be carried out simultaneously, improving work efficiency.

[0033] Second embodiment Hereinafter, the second embodiment will be described with reference to Figures 7 and 8. In Figures 7 and 8, the bracket 8 is illustrated in a simplified form for the sake of simplicity of explanation. In addition, the description will also refer to Figures 1 to 6 as necessary.

[0034] As shown in Fig. 7, the fixing bracket 7 of this embodiment further has a guide portion 73 that protrudes outward from the outer peripheral surface, and the accommodating portion 82 further has an accommodating-side guide groove 83a into which the guide portion 73 is inserted, at a position corresponding to the guide portion 73 of the fixing bracket 7. With this configuration, if the fixing bracket 7 is accommodated in the accommodating portion 82 with the guide portion 73 aligned with the accommodating-side guide groove 83a, the positioning of the fitting-side hole portion 72 and the accommodating-side hole portion 85 in the radial and circumferential directions can be performed simultaneously. In other words, the processes of steps S4 and S5 shown in Fig. 5 can be performed simultaneously. This makes it possible to improve work efficiency and ease of assembly.

[0035] Alternatively, as shown in Fig. 8, the fixing metal fitting 7 can be configured to further have a guide groove 74 recessed inward from the outer peripheral surface, and the accommodation section 82 can further have an accommodation-side guide portion 83b that is inserted into the guide groove 74. With this configuration, the fixing metal fitting 7 can be accommodated in the accommodation section 82 with the position of the guide groove 74 and the position of the accommodation-side guide portion 83b aligned, thereby simultaneously positioning the metal fitting-side hole portion 72 and the accommodation-side hole portion 85 in the radial and circumferential directions. In other words, the processes of steps S4 and S5 shown in Fig. 5 can be performed simultaneously. This can improve work efficiency and ease of assembly.

[0036] Although not shown, the fixing bracket 7 has at least one of a guide portion 73 protruding outward from the surface or a guide groove 74 recessed inward from the surface, and the accommodation portion 82 can have at least one of an accommodation-side guide groove 83a into which the guide portion 73 is inserted or an accommodation-side guide portion 83b inserted into the guide groove 74, which corresponds to the fixing bracket 7. That is, the fixing bracket 7 can be provided with a plurality of guide portions 73 and guide grooves 74, or can be provided with one or more of both the guide portion 73 and the guide groove 74. With such a configuration, the fitting-side hole portion 72 and the accommodation-side hole portion 85 can be positioned simultaneously in the radial and circumferential directions, improving workability and assembly.

[0037] Third embodiment Hereinafter, the third embodiment will be described with reference to Figures 9 to 11. In addition, the description will also refer to Figures 1 to 8 as necessary.

[0038] 9, the fixing metal fitting 7 of this embodiment has a restricting portion 75 formed at the end of the non-load side of the mounting hole 71, extending radially inward along the side surface of the outer ring 62 of the bearing 6, and restricting the axial movement of the outer ring 62. The restricting portion 75 has a radial thickness D31 from the mounting hole 71, and the thickness (D31) is equal to or smaller than the thickness (D1) of the outer ring 62 of the bearing 6. In other words, the restricting portion 75 is formed to a size that allows it to come into contact only with the outer ring 62 of the bearing 6, but does not come into contact with the inner ring 61. The radial width of the mounting hole 71 excluding the restricting portion 75 is W11, and the fixing metal fitting 7 comes into contact with the entire outer circumferential surface of the bearing 6.

[0039] 5, the bearing 6 is indirectly fixed by the fixing bracket 7 with the anti-load side of the outer ring 62 in contact with the restricting portion 75 as shown in FIG. 10. This allows the restricting portion 75 to restrict the movement of the bearing 6 even if a thrust load is applied that tries to move the bearing 6 to the anti-load side. Furthermore, the contact between the side of the outer ring 62 and the restricting portion 75 has the effect of suppressing the occurrence of creep. Even if creep occurs, there is no need to replace the bracket 8, and it is sufficient to replace the fixing bracket 7, so that an increase in costs can be suppressed.

[0040] Furthermore, as shown in Figure 11 as another regulating configuration example 1, a regulating portion 75 can be provided on a fixing bracket 7 having a guide portion 73, and as shown in Figure 11 as another regulating configuration example 2, a regulating portion 75 can be provided on a fixing bracket 7 having a guide groove 74.

[0041] In addition, although not shown in the figures, a regulating portion 75 can be provided on a fixing bracket 7 having multiple guide portions 73 and guide grooves 74, or on a fixing bracket 7 having one or more guide portions 73 and one or more guide grooves 74. Further, in this embodiment, the restricting portion 75 is provided over the entire circumferential area, but the restricting portion 75 may be provided over a portion of the circumferential area.

[0042] (Other embodiments) Other embodiments will be described below with reference to Figures 12 to 15. Each modified example described below can be combined with each embodiment to the extent that the configurations do not overlap, and will be described with reference to Figures 1 to 8 as necessary.

[0043] In each embodiment, a configuration example in which the outer ring 62 of the bearing 6 contacts the first bottom portion 86 of the bracket 8 has been shown, but as shown in Fig. 12, a configuration in which a gap of a distance (W41) is provided between the outer ring 62 of the bearing 6 and the first bottom portion 86 can be used. This allows the bearing 6 and the bracket 8 to be in a completely non-contact state, and even if a defect such as creep occurs, there is no need to replace the bracket 8, making it possible to suppress an increase in costs. Although not shown in the figures, the fixing bracket 7 having the guide portion 73 and guide groove 74 described in the second embodiment and the fixing bracket 7 having the regulating portion 75 described in the third embodiment can also be configured to provide a predetermined gap between the outer ring 62 of the bearing 6 and the first bottom portion 86.

[0044] Although each embodiment has shown an example configuration in which the outer shape of the fixing bracket 7 is circular, the fixing bracket 7 can be formed in an irregular shape in which at least a part of the outer shape is different from a circle. Examples of irregular shapes include a circular outer shape with a part made linear as in Other Shape Example 1 shown in the axial direction in Fig. 13, an outer shape made rectangular such as a square as in Other Shape Example 2, and an outer shape made elliptical as in Other Shape Example 3.

[0045] With this configuration, it is possible to obtain the same effects as in each of the embodiments, such as being able to perform alignment and positioning simultaneously. Also, as in Shape Example 2 and Shape Example 3, by providing the metal fitting side hole portion 72 at a symmetrical position with respect to the central axis (J1), even if the assembly is assembled upside down, the position of the metal fitting side hole portion 72 will match the accommodation side hole portion 85, thereby preventing errors during assembly.

[0046] In each embodiment, a fixing bracket 7 having a block-shaped cross section has been exemplified, but it is also possible to configure a configuration in which a part of the fixing bracket 7 is hollowed out to provide a hollowed-out portion 76, as shown in a partial cross section in Fig. 14. This allows for weight reduction. Note that the hollowed-out portion 76 shown in Fig. 14 is just one example, and hollowing out can be performed on other portions or multiple portions as long as the required specifications, such as strength, can be ensured. It is also possible to apply this to a fixing bracket 7 that does not have a restricting portion 75.

[0047] Although each embodiment has been described with reference to a configuration in which the fixing bracket 7 is fixed to the back side of the bracket 8, it may also be configured to be fixed to the front side of the bracket 8. That is, the fixing bracket 7 may be configured to be accommodated in the accommodation portion 82 from the front side of the bracket 8. Specifically, as shown in Fig. 15, for example, a flange-structured flange portion 77 is provided at the load side end of the fixing bracket 7, and the flange portion 77 is provided with a fitting side hole portion 72. In this case, if the radius from the central axis to the outer edge of the flange portion 77 is R41, then the bracket 8 is formed with an accommodation portion 82 having a radius of R42 capable of accommodating the fixing bracket 7, including the flange portion 77.

[0048] At this time, the radius (R42) of the accommodation portion 82 is set to a value that allows the fixing metal fitting 7 to be accommodated in a so-called spigot-type nested structure. The bracket 8 is attached to the case 2 in a spigot-type nested structure by a wall portion provided on the case 2 side. In the case of this configuration, the rotating electric machine 1 is assembled in the following procedure: the rotor 4 with the shaft member 5 pressed in is placed inside the case 2, the bracket 8 is passed through the shaft member 5, the bearing 6 attached to the fixing metal fitting 7 is attached to the shaft member 5, the fixing metal fitting 7 is accommodated in the accommodation portion 82, the holes are aligned and positioned, and then the fixing metal fitting 7 is fixed with the bolts 9. Although not shown in the drawings, a cover member for covering the front side of the bearing 6 may be provided.

[0049] As a result, the bracket 8 is assembled to the case 2 in a suitable positional relationship with a spigot joint, and the fixing bracket 7 is assembled to the bracket 8 in a suitable positional relationship with a spigot joint, and the rotating electric machine 1 can be assembled with the central axis (J1) at a specified position. Therefore, the ease of assembly can be greatly improved, and various effects similar to those of the embodiment can be obtained, such as suppressing an increase in cost due to poor ease of assembly. In addition, the guide portion 73 and guide groove 74 described in the second embodiment can be provided, the restricting portion 75 described in the third embodiment can be provided, or a structure similar to the restricting portion 75 can be provided along the load side surface of the outer ring 62 of the bearing 6.

[0050] Although each embodiment has exemplified a configuration in which the accommodation portion 82 is formed by the accommodation wall portion 83, the space on the back side of the bracket 8 can serve as the accommodation portion 82 without providing the accommodation wall portion 83. This is because the central opening 88 of the bracket 8 is formed slightly larger than the diameter of the shaft member 5, and by passing the shaft member 5 through this central hole, the centers of the bearing 6, the fixed member, and the shaft member 5 are brought into a state where they approximately coincide with the central axis (J1), and the fitting side hole portion 72 and the accommodation side hole portion 85 can be positioned within a predetermined range.

[0051] In each embodiment, the bearing 6 that supports the load side end of the shaft member 5 has been described, but the fixing bracket 7 can also be applied to a ball bearing or roller bearing that supports the anti-load side end. In each embodiment, the fixing metal fitting 7 is configured to contact the outer circumferential surface of the bearing 6 over the entire axial direction, but the width (W11) of the fixing member having the restricting portion 75 can be configured to be slightly shorter than the width (W1) of the bearing 6. This allows the outer ring 62 of the bearing 6 to contact the restricting portion 75 and the first bottom portion 86 more firmly, improving resistance to thrust loads.

[0052] In each embodiment, a configuration has been exemplified in which the guide portion 73 or the guide groove 74 is formed on the outer peripheral surface of the fixing bracket 7, but the guide portion 73 or the guide groove 74 may also be provided on the surface facing the first bottom portion 86 or the regulating portion 75 of the fixing bracket 7. Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0053] In the drawings, 1 indicates a rotating electric machine, 5 indicates a shaft member, 6 indicates a bearing, 7 indicates a fixing bracket, 8 indicates a bracket, 62 indicates an outer ring, 71 indicates an assembly hole portion, 72 indicates a bracket side hole portion, 73 indicates a guide portion, 74 indicates a guide groove, 75 indicates a regulating portion, 76 indicates a hollowed-out portion, 82 indicates a accommodating portion, 83 indicates a accommodating wall portion, 83a indicates a accommodating side guide groove, 83b indicates a accommodating side guide portion, and 85 indicates a accommodating side hole portion.

Claims

1. a bearing having an inner ring and an outer ring; a fixing metal fitting having an assembly hole into which the bearing is attached and a plurality of metal fitting side holes for screw fastening formed around the assembly hole; a bracket having a housing portion for housing the fixing metal fitting and a plurality of housing side holes for screwing the fixing metal fitting, the fixing fitting is accommodated in the accommodation portion, so that the position of the fitting side hole portion in the radial direction is determined within a predetermined range from the accommodation side hole portion, The bearing is indirectly fixed by the fixing bracket which is fixed to the bracket.

2. The fixing metal fitting has at least one of a guide portion protruding outward from a surface thereof and a guide groove recessed inward from a surface thereof, 2 . The rotating electric machine according to claim 1 , wherein the accommodation portion has at least one of an accommodation-side guide groove into which the guide portion is inserted and an accommodation-side guide portion inserted into the guide groove, the accommodation portion corresponding to the fixing metal fitting.

3. 2. A rotating electric machine according to claim 1, wherein the fixing bracket is formed extending radially inward from the assembly hole along a side surface of the outer ring of the bearing, and has a restricting portion that restricts axial movement of the outer ring.

4. The rotating electric machine according to claim 1 , wherein at least a part of the outer shape of the fastener is formed in a shape different from a circular shape.

5. 2. The rotating electric machine according to claim 1, wherein the bearing is not in contact with the bracket.

6. 2. The rotating electric machine according to claim 1, wherein the fixing metal fitting is hollowed out.

7. a step of assembling the bearing and a fixing fixture having an assembly hole into which the bearing is to be assembled; a step of assembling a shaft member and the bearing; a step of accommodating the fixing metal fitting together with the bearing in an accommodating portion formed in a bracket, and positioning screw fastening holes formed in the fixing metal fitting and the bracket, respectively, within a predetermined range in the radial direction; indirectly fixing the bearing by fixing the fixture to the bracket; A method for manufacturing a rotating electric machine comprising the steps of:

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