ROTOR SLEEVE, ROTOR AND MOTOR

Abstract

A rotor sleeve (10) comprises: a through hole (11) into which a spindle (20) is inserted, having a small-diameter shaft portion (21) and a large-diameter shaft portion (22), which are arranged side by side in the direction of an axis (A) and have different outer diameters; a first attachment outer surface (13) to which an inner surface of a cylindrical iron core (30) can be attached; and second attachment outer surfaces (14) arranged on both outer sides and adjacent to the first attachment outer surface in the direction of the axis, and to which inner surfaces of a pair of cylindrical side rings (40) can be attached. The through hole has a small-diameter hole portion (15) to which the small-diameter shaft portion is attached, a large-diameter hole portion (16) to which the large-diameter shaft portion is attached,and an intermediate hole portion (17) arranged between the small-diameter hole portion and the large-diameter hole portion in the direction of the axis, wherein a space between the attached spindle and the intermediate hole portion is pressurized with hydraulic oil. An inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the small-diameter hole portion side is larger than an inner diameter of the small-diameter hole portion located radially inward of the first attachment outer surface, and an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the large-diameter hole portion side is larger than an inner diameter of the large-diameter hole portion located radially inward of the first attachment outer surface.

Description

{Technical field}

[0001] The present disclosure relates to a rotor sleeve, a rotor and a motor. {State of the art}

[0002] A known rotor comprises a sleeve mounted on an outer peripheral surface of a spindle, forming a closed gap therebetween, and a cylindrical iron core mounted on the outer peripheral surface of the sleeve (see, for example, PTL 1). Clamping discs are also mounted on the outer peripheral surface of the sleeve on both outer sides of the iron core in the direction of an axis.

[0003] During disassembly of this rotor, hydraulic oil pressure is applied to the gap between the spindle and the sleeve to radially expand the sleeve, including the iron core and the clamping discs attached to it. The sleeve is removed from the spindle by continuing to apply hydraulic oil pressure until the contact pressure at the attachment section between the spindle and the sleeve reaches zero. {List of citations}{Patent literature}

[0004] {PTL 1] Japanese translation of the PCT international application, Publication No. 2008-515365 {Summary of the invention}{Technical problem}

[0005] In this rotor, due to the different materials, machining accuracy, etc., of the clamping discs and the iron core, the sections of the sleeve corresponding to the clamping discs may be subject to greater radial inward deformation than the section of the sleeve corresponding to the iron core. Furthermore, if the sleeve is installed on the spindle in this state, the fit between the sleeve and the spindle becomes tighter than necessary, requiring greater hydraulic oil pressure when disassembling the rotor, thus affecting work efficiency.

[0006] Therefore, in a rotor having the sleeve on whose outer peripheral surface the iron core and members other than the iron core are attached, it is desirable to improve the working efficiency when removing the sleeve from the spindle. {Solution to the problem}

[0007] One aspect of the present disclosure is a rotor sleeve comprising: a through hole into which a spindle having a small-diameter shaft portion and a large-diameter shaft portion disposed adjacent to each other in an axis direction and having different outer diameters is inserted; a first attachment outer surface to which an inner surface of a cylindrical iron core can be attached; and second attachment outer surfaces disposed on both outer sides and adjacent to the first attachment outer surface in the axis direction, and to which inner surfaces of a pair of cylindrical side rings can be attached.The through hole has a small diameter hole portion to which the small diameter shaft portion is attached, a large diameter hole portion to which the large diameter shaft portion is attached, and an intermediate hole portion disposed between the small diameter hole portion and the large diameter hole portion in the axis direction, wherein a space between the attached spindle and the intermediate hole portion is pressurized with hydraulic oil.An inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the small diameter hole portion side is larger than an inner diameter of the small diameter hole portion located radially inward of the first attachment outer surface, and an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the large diameter hole portion side is larger than an inner diameter of the large diameter hole portion located radially inward of the first attachment outer surface. {Brief description of the drawings} { Fig. 1] Fig. 1 is a vertical sectional view showing a rotor according to a first embodiment of the present disclosure. { Fig. 2] Fig. 2 is a side view showing part of a spindle that drives the rotor in Fig. 1 forms. { Fig. 3] Fig. 3 is a vertical sectional view showing a sleeve according to the first embodiment of the present disclosure. { Fig. 4] Fig. 4 is a vertical sectional view showing a state in which an iron core and side rings are attached to the sleeve in Fig. 3 are attached. { Fig. 5] Fig. Fig. 5 is a vertical sectional view showing a part of a first modification of the rotor in Fig. 1 shows. { Fig. 6] Fig. 6 is a vertical sectional view showing a second modification of the rotor in Fig. 1 shows. {Description of the embodiments}

[0008] A sleeve 10 and a rotor 1 according to an embodiment of the present disclosure will be described below with reference to the drawings. Furthermore, for clarity, components are exaggerated in all drawings referred to in the following description.

[0009] The rotor 1 according to this embodiment is, for example, a rotor for a built-in motor, wherein a stator is integrated into an industrial machine. As shown in Fig. As shown in Figure 1, the rotor 1 comprises a spindle 20 and a cylindrical sleeve (rotor sleeve) 10 with a through hole 11 into which the spindle 20 is inserted. The rotor 1 comprises an iron core 30 and two side rings 40 which are fixed to the outer peripheral surface of the sleeve 10.

[0010] As in the Fig. 1 and Fig. 2, the spindle 20 has a small-diameter shaft portion 21 and a large-diameter shaft portion 22 arranged side by side in a direction along the axis A. The spindle 20 has a bearing surface 23 intended to be brought into contact with one end of the sleeve 10 in the direction along the axis A.

[0011] The small-diameter shaft portion 21 and the large-diameter shaft portion 22 each have a smooth cylindrical outer surface, and the outer diameter D1 of the small-diameter shaft portion 21 is smaller than the outer diameter D2 of the large-diameter shaft portion 22. Furthermore, a shoulder with a height equal to the difference between the outer diameters ((D2 - D1) / 2) is formed between the small-diameter shaft portion 21 and the large-diameter shaft portion 22.

[0012] As in the Fig. 1 and Fig. 3, the sleeve 10 has an outer peripheral surface (first attachment outer surface) 13 to which the iron core 30 described below is attached at the central position in the direction of the axis A. The sleeve 10 also has a pair of outer peripheral surfaces (second attachment outer surfaces) 14 on both outer sides and adjacent to the outer peripheral surface 13 in the direction of the axis A, to which the side rings 40 described below are attached.

[0013] The iron core 30 is formed in a cylindrical shape by laminating a plurality of elements in a plate thickness direction, which are obtained by punching a thin plate made of a magnetic material, such as an electrical steel plate, into an annular shape. The inner peripheral surface of the iron core 30 is attached to the outer peripheral surface 13 of the sleeve 10 and is in close contact therewith over the entire circumference.

[0014] Each of the side rings 40 is an annular member with an outer diameter larger than that of the iron core 30 and is attached to the corresponding outer peripheral surface 14, similar to the iron core 30. Specifically, the pair of side rings 40 are arranged on both outer sides of the iron core 30 in the direction of the axis A to protect the iron core 30 from contact with the inner surface of the stator when the rotor 1 is inserted into the stator. The side rings 40 have a plurality of screw holes (not shown) for attaching weights to adjust the balance of the rotor 1.

[0015] In this embodiment, the side rings 40 are made of a non-magnetic material to reduce the stray magnetic flux in the direction of the axis A of the magnetic flux passing through the iron core 30. Typically, the linear expansion coefficient of a non-magnetic material is greater than that of the magnetic material forming the iron core 30. Therefore, the side rings 40 are attached to the sleeve 10 with larger interference than those of the iron core 30.

[0016] Specifically, when the iron core 30 and the side rings 40 are attached to the outer peripheral surfaces 13 and 14 of the sleeve 10, the iron core 30 and the side rings 40 are attached to the sleeve 10 in a state where the iron core 30 and the side rings 40 are heated, so that their inner diameters are enlarged. Then, when the iron core 30 and the side rings 40 are cooled to room temperature, their inner diameters contract, and thus the iron core 30 and the side rings 40 are fixed, that is, shrunk, to the outer peripheral surfaces 13 and 14 of the sleeve 10 in a state of close contact.

[0017] Shrinkage is also performed when the spindle 20 is inserted into the through hole 11 of the sleeve 10 onto which the iron core 30 and the side rings 40 have been shrunk as described above. In this case, if the interference of the iron core 30 with respect to the sleeve 10 and the interference of the side rings 40 with respect to the sleeve 10 are the same, the side rings 40, which have a large coefficient of linear expansion, may loosen and fall off due to heating during shrinkage. Therefore, the interference of the side rings 40 is set larger than the interference of the iron core 30 to prevent the side rings 40 from falling off during shrinkage.

[0018] As in Fig. 1, the through hole 11 in the sleeve 10 has, at one end thereof in the direction of axis A, a small-diameter hole portion 15 into which the small-diameter shaft portion 21 of the spindle 20 is inserted, and, at the other end thereof, a large-diameter hole portion 16 into which the large-diameter shaft portion 22 of the spindle 20 is inserted. The through hole 11 further has an intermediate hole portion 17 disposed between the small-diameter hole portion 15 and the large-diameter hole portion 16 in the direction of axis A and having a larger inner diameter than the large-diameter hole portion 16.

[0019] The through hole 11 further has an end hole portion 15e located radially inward of an outer peripheral surface 14 on the outside of the small-diameter hole portion 15 in the direction of the axis A. Likewise, the through hole 11 has an end hole portion 16e located radially inward of the other outer peripheral surface 14 on the outside of the large-diameter hole portion 16 in the direction of the axis A.

[0020] As in Fig. As shown in Figure 3, the dimensions of the sleeve 10 in a normal temperature state before the iron core 30 and the side rings 40 are fitted together are set as follows. Specifically, the inner diameters d1 and d2 of the small-diameter hole portion 15 and the large-diameter hole portion 16 are set to be smaller than the outer diameters D1 and D2 of the small-diameter shaft portion 21 and the large-diameter shaft portion 22 of the spindle 20, respectively, by the amount of interference.

[0021] Meanwhile, the inner diameter d1' of the end hole portion 15e is set larger than the outer diameter D1 of the small-diameter shaft portion 21 of the spindle 20, and the inner diameter d2' of the end hole portion 16e is set larger than the outer diameter D2 of the large-diameter shaft portion 22 of the spindle 20. For example, the inner diameters d1' and d2' are set so that the dimensional differences (d1' - D1) and (d2' - D2) are greater than or equal to the contraction amounts of the inner diameters d1' and d2' that occur when the side rings 40 described below shrink.

[0022] The intermediate hole portion 17 defines a closed cylindrical space between the intermediate hole portion 17 and the outer peripheral surface of the spindle 20 when the spindle 20 is inserted into the through hole 11. A hydraulic oil pressure supply hole 18 is provided in the space defined by the intermediate hole portion 17, through which hydraulic oil pressure is supplied from outside the sleeve 10.

[0023] The operation of the sleeve 10 or rotor 1 configured in this way according to this embodiment is described below.

[0024] When assembling the rotor 1 according to this embodiment, the iron core 30 and the side rings 40 are first applied by shrinking onto the outer peripheral surface 13 and the pair of outer peripheral surfaces 14 of the sleeve 10, respectively. Thus, a unit is formed in which the iron core 30 and the side rings 40 are integrally attached to the sleeve 10.

[0025] As described above, after shrinking the iron core 30 and the side rings 40 by cooling to room temperature, the sleeve 10 is subjected to stresses corresponding to the magnitudes of the interference fits of these elements. That is, in the sleeve 10, sections corresponding to the side rings 40, which are applied with larger interference, are subjected to a greater stress than a section corresponding to the iron core 30. Therefore, as shown in Fig. 4, the end hole sections 15e and 16e of the through hole 11 in the sleeve 10 are slightly deformed radially inward, ie the inner diameters d1' and d2' are contracted.

[0026] Subsequently, to fix the unit in this state to the spindle 20, the unit is heated, and the spindle 20 is inserted into the through hole 11 in the sleeve 10 by shrinking from the large-diameter hole portion 16 side to the small-diameter hole portion 15 side. The spindle 20 and the sleeve 10 are positioned in the direction of the axis A by abutting the abutment surface 23 of the spindle 20 against the end surface of the end hole portion 16e of the sleeve 10.

[0027] Thereafter, by cooling the unit to room temperature, the small diameter shaft part 21 and the large diameter shaft part 22 of the spindle 20 are inserted into the small diameter hole part 15 and the large diameter hole part 16 of the sleeve 10 in a close contact state, respectively, and thus the rotor 1 is assembled.

[0028] In this case, before attaching the iron core 30 and the side rings 40, the inner diameters of the end hole portions 15e and 16e of the sleeve 10 are set larger than the inner diameters of the small-diameter hole portion 15 and the large-diameter hole portion 16 adjacent thereto, respectively. Therefore, even if the inner diameters of the end hole portions 15e and 16e are contracted by attaching the side rings 40, it can be ensured that the inner diameter of the end hole portion 15e is larger than or equal to the inner diameter of the small-diameter hole portion 15, and that the inner diameter of the end hole portion 16e is larger than or equal to the inner diameter of the large-diameter hole portion 16.

[0029] In particular, when the above-described unit is shrunk onto the spindle 20, the insertion of the small-diameter shaft portion 21 into the small-diameter hole portion 15 and the insertion of the large-diameter shaft portion 22 into the large-diameter hole portion 16 are not hindered by contracted end hole portions 15e and 16e.

[0030] Meanwhile, when disassembling the rotor 1, hydraulic oil pressure is applied to the space between the intermediate hole portion 17 and the outer peripheral surface of the spindle 20 to expand the through hole 11 in the radial direction. Subsequently, the spindle 20 and the sleeve 10 are separated from each other by continuing to apply hydraulic oil pressure until the fit between the small-diameter hole portion 15 and the small-diameter shaft portion 21 and the fit between the large-diameter hole portion 16 and the large-diameter shaft portion 22 are released.

[0031] Since the outer peripheral surface of the spindle 20 is not drawn in by the contracted end hole sections 15e and 16e, the withdrawal of the spindle 20 from the through hole 11 in the sleeve 10 is not hindered by the contracted end hole sections 15e and 16e in this case either.

[0032] Therefore, when disassembling the slider 1, it is not necessary to apply hydraulic oil pressure that is higher than necessary. This improves the work efficiency when removing the sleeve 10 from the spindle 20.

[0033] In this embodiment, as in Fig. 5, the sleeve 10 has fragile portions at boundaries between the portion corresponding to the iron core 30 and the portions corresponding to the side rings 40, in which its cross-sectional area is locally reduced.

[0034] In the example in Fig. 5, the fragile portions are formed of circumferential grooves 19o and 19i provided respectively at the boundaries between the outer peripheral surface 13 and the pair of outer peripheral surfaces 14, the boundary between the small diameter hole portion 15 and the end hole portion 15e, and the boundary between the large diameter hole portion 16 and the end hole portion 16e.

[0035] As a result, the bending rigidity of the sleeve 10 is reduced at the boundaries between the end hole portion 15e and the small-diameter hole portion 15, and between the end hole portion 16e and the large-diameter hole portion 16. Therefore, when the side rings 40 are applied to the outer peripheral surfaces 14, the end hole portions 15e and 16e are slightly deformed radially inward. In particular, even when large stresses are applied to the end hole portions 15e and 16e due to the application of the side rings 40, it is possible to prevent the stresses from being transmitted to the small-diameter hole portion 15 and the large-diameter hole portion 16.

[0036] Thus, deformation of the small diameter hole portion 15 and the large diameter hole portion 16 is suppressed by the application of the side rings 40, and the small diameter hole portion 15 and the large diameter hole portion 16 can be prevented from being attached to the spindle 20 more tightly than necessary.

[0037] Furthermore, in this case, one of the circumferential grooves 19o and 19i may be omitted, or the circumferential grooves 19o and 19i may be formed from a plurality of grooves arranged intermittently in the circumferential direction. Alternatively, the fragile portion may be formed in a shape other than a groove, as long as the fragile portion locally reduces the cross-sectional area of ​​the sleeve 10 at the boundaries between the portion corresponding to the iron core 30 and the portions corresponding to the side rings 40.

[0038] In this embodiment, the side rings 40 are made of a non-magnetic material, but the present invention is not limited thereto. For example, the side rings 40 may be made of a magnetic material similar to the iron core 30.

[0039] In this case, since the linear expansion coefficients of the iron core 30 and the side rings 40 are equal, the interference of the iron core 30 and the side rings 40 with respect to the sleeve 10 can be set equal. In particular, it is possible to prevent the end hole portions 15e and 16e from being deformed radially inward due to a difference in interference between the iron core 30 and the side rings 40.

[0040] Even if the interference of the iron core 30 and the side rings 40 are the same, if the machining accuracies, etc., of the iron core 30 and the side rings 40 are different, the end hole portions 15e and 16e may be deformed radially inward. For example, if the circularity of the inner peripheral surfaces of the side rings 40 is worse than the circularity of the inner peripheral surface of the iron core 30, the end hole portions 15e and 16e of the through hole 11 will be deformed radially inward even more.

[0041] In this case too, the same effect as described above can be achieved by attaching the sleeve 10 or the rotor 1 according to this embodiment.

[0042] In this embodiment, the small-diameter hole portion 15 and the large-diameter hole portion 16 of the sleeve 10 are fixed in close contact over their entire circumferences to the small-diameter shaft portion 21 and the large-diameter shaft portion 22, respectively. Alternatively, the small-diameter hole portion 15 and the large-diameter hole portion 16 may be partially fixed to the small-diameter shaft portion 21 and the large-diameter shaft portion 22, respectively.

[0043] For example, in the inner peripheral surfaces of the small diameter hole portion 15 and the large diameter hole portion 16, a plurality of linear grooves extending in the direction of the axis A may be arranged at equal intervals in the circumferential direction.

[0044] In this case, it is possible to optimize the mounting area between the small-diameter hole portion 15 and the small-diameter shaft portion 21, and the mounting area between the large-diameter hole portion 16 and the large-diameter shaft portion 22 by adjusting the width of the linear grooves and the like. This makes it possible to more easily remove the sleeve 10 from the spindle 20.

[0045] In this case, however, the inner peripheral surfaces of the end hole portions 15e and 16e must be in close contact with the outer peripheral surfaces of the small-diameter shaft portion 21 and the large-diameter shaft portion 22, respectively, to prevent the hydraulic oil pressure supplied during removal of the sleeve 10 from leaking through the linear grooves. In this case, the same effect as described above can be achieved by making the interference of the end hole portions 15e and 16e with respect to the spindle 20 smaller than the interference of the small-diameter hole portion 15 and the large-diameter hole portion 16.

[0046] In this embodiment, as in Fig. 6, instead of the end hole portion 15e on the small diameter hole portion 15 side, a step portion 24 may be provided adjacent to the outer side of the small diameter shaft portion 21 of the spindle 20 in the direction of the axis A.

[0047] In the example in Fig. 6, the step portion 24 has an outer diameter D3 smaller than the outer diameter D1 of the small-diameter shaft portion 21. Thus, a step having a height equal to the difference between the outer diameters ((D1-D3) / 2) is formed between the small-diameter shaft portion 21 and the step portion 24. In a state where the rotor 1 is assembled, the step portion 24 is located radially inward of the portion of the small-diameter hole portion 15 corresponding to the side ring 40.

[0048] Thus, a clearance having a size corresponding to the step between the small diameter shaft portion 21 and the step portion 24 ((D1-D3) / 2) is formed between the inner peripheral surface of the small diameter portion of the hole portion 15 corresponding to the side ring 40 and the outer peripheral surface of the step portion 24.

[0049] Thus, even if the portion of the small diameter hole portion 15 corresponding to the side ring 40 is deformed radially inward due to the application of the side ring 40, it is possible to absorb the deformation by the clearance generated by the step portion 24.

[0050] This can prevent the inner peripheral surface of the small-diameter hole portion 15 from being attached to the outer peripheral surface of the spindle 20 more tightly than necessary. Meanwhile, on the large-diameter hole portion 16 side of the sleeve 10, as in the above-described embodiment, by providing the sleeve 10 with the end hole portion 16e, the sleeve 10 and the spindle 20 are prevented from being attached to each other more tightly than necessary. Thus, the same effects as described above can also be achieved in the Fig. 6 shown embodiment.

[0051] In this embodiment, the inner diameters d1' and d2' of the end hole portions 15e and 16e are set so that the dimensional differences (d1' - D1) and (d2' - D2) are greater than or equal to the contraction amounts of the inner diameters d1' and d2' that occur when the side rings 40 are shrunk on. Alternatively, the dimensional differences (d1' - D1) and (d2' - D2) may be smaller than the contraction amounts of the inner diameters d1' and d2' that occur when the side rings 40 are shrunk on. In this case, the sleeve 10 and the spindle 20 are in close contact with each other even at the end hole portions 15e and 16e. However, the fixing force between the sleeve 10 and the spindle 20 is lower than in the case where the end hole portions 15e and 16e are not provided. Therefore, it is possible to improve the ease of assembly and disassembly of the rotor 1.

[0052] As described above, the end hole portions are exaggerated in the drawings, and in reality, the contraction amounts of the inner diameters d1' and d2' of the end hole portions 15e and 16e during shrink fitting may be so small that they do not appear in the drawings. Therefore, the small-diameter hole portion 15 and the large-diameter hole portion 16 can be fitted by interference fit, and the end hole portions 15e and 16e can be fitted by clearance fit, so that the size relationship is defined within the range of dimensional tolerance using the same nominal dimensions.

[0053] Although the embodiments of the present disclosure have been described in detail, the present disclosure is not limited to the above-described embodiment. Various additions, substitutions, changes, partial omissions, and the like can be made to these embodiments without departing from the gist of the invention or without deviating from the spirit and essence of the invention derived from the contents described in the claims and their equivalents. For example, in the above-described embodiment, the order of operations and the sequence of processes are exemplified and are not exhaustive.

[0054] The following additional features are further disclosed with respect to the above-described embodiment and modifications. (Note 1)

[0055] A rotor sleeve comprising: a through hole into which a spindle having a small-diameter shaft portion and a large-diameter shaft portion, which are arranged side by side in the direction of an axis and have different outer diameters, is inserted; a first attachment outer surface to which an inner surface of a cylindrical iron core can be attached; and second attachment outer surfaces arranged on both outer sides and adjacent to the first attachment outer surface in the direction of the axis and to which inner surfaces of a pair of cylindrical side rings can be attached, wherein the through hole has a small-diameter hole portion to which the small-diameter shaft portion is attached, a large-diameter hole portion to which the large-diameter shaft portion is attached,and an intermediate hole portion disposed between the small-diameter hole portion and the large-diameter hole portion in the axis direction, wherein a space between the attached spindle and the intermediate hole portion is pressurized with hydraulic oil, an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the small-diameter hole portion side is larger than an inner diameter of the small-diameter hole portion located radially inward of the first attachment outer surface, and an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the large-diameter hole portion side is larger than an inner diameter of the large-diameter hole portion located radially inward of the first attachment outer surface. (Note 2)

[0056] The rotor sleeve according to Note 1, wherein at least one of: boundaries between the first attachment outer surface and the second attachment outer surface; or portions of an inner surface of the through-hole corresponding to the boundaries is provided with a fragile portion that locally reduces a cross-sectional area of ​​the rotor sleeve. (Note 3)

[0057] The rotor sleeve according to Note 2, wherein the fragile portion is a groove extending in a circumferential direction in at least one of the boundaries or the portions of the inner surface of the through hole corresponding to the boundaries. (Note 4)

[0058] A rotor comprising: the rotor sleeve according to any one of notes 1 to 3; the iron core shrunk onto the first attachment outer surface; and the pair of side rings shrunk onto the second attachment outer surfaces. (Note 5)

[0059] The rotor according to note 4, wherein the side rings are formed of a non-magnetic material. (Note 6)

[0060] The rotor according to note 4 or 5, further comprising the spindle inserted in the through hole. (Note 7)

[0061] A motor having the rotor as defined in any of Notes 4 to 6. {Reference symbol list} 1 runner 10 Sleeve (runner sleeve) 11 Through hole 13 Outer peripheral surface (first attachment outer surface) 14 Outer peripheral surface (second mounting outer surface) 15 small diameter hole section 16 large diameter hole section 17 Intermediate hole section 19i circumferential groove (groove) 19o circumferential groove (groove) 20 spindle 21 Small diameter shaft section 22 Large diameter shaft section 30 iron core 40 side ring A axis QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2008-515365

[0004]

Claims

[1] Rotor sleeve, comprising: a through hole in which a spindle having a small-diameter shaft portion and a large-diameter shaft portion arranged side by side in the direction of an axis and having different outer diameters is inserted; a first attachment outer surface to which an inner surface of a cylindrical iron core can be attached; and second attachment outer surfaces arranged on both outer sides and adjacent to the first attachment outer surface in the direction of the axis and to which inner surfaces of a pair of cylindrical side rings can be attached, wherein the through hole has a small-diameter hole portion to which the small-diameter shaft portion is attached, a large-diameter hole portion to which the large-diameter shaft portion is attached, and an intermediate hole portion disposed between the small-diameter hole portion and the large-diameter hole portion in the direction of the axis, wherein a space between the attached spindle and the intermediate hole portion is pressurized with hydraulic oil, an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the small diameter hole portion side is larger than an inner diameter of the small diameter hole portion located radially inward of the first attachment outer surface, and an inner diameter of the through hole at a portion located radially inward of a second attachment outer surface on the large diameter hole portion side is larger than an inner diameter of the large diameter hole portion located radially inward of the first attachment outer surface. [2] The rotor sleeve according to claim 1, wherein at least one of: boundaries between the first attachment outer surface and the second attachment outer surface; or portions of an inner surface of the through-hole corresponding to the boundaries is provided with a fragile portion that locally reduces a cross-sectional area of ​​the rotor sleeve. [3] The rotor sleeve according to claim 2, wherein the fragile portion is a groove extending in a circumferential direction in at least one of the boundaries or the portions of the inner surface of the through hole corresponding to the boundaries. [4] Runners, including: the rotor sleeve according to one of claims 1 to 3; the iron core shrunk onto the first outer mounting surface; and the pair of side rings shrunk onto the second mounting outer surfaces. [5] A rotor according to claim 4, wherein the side rings are formed of a non-magnetic material. [6] A rotor according to claim 4 or 5, further comprising the spindle inserted into the through hole. [7] A motor comprising the rotor according to any one of claims 4 to 6.

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