Rotating electric machines and vehicles

Abstract

To attain downsizing of a rotary electric machine while regulating displacement of a rotor core in an axial direction.SOLUTION: A rotor 3 of a rotary electric machine comprises a rotor core 20 through which a shaft 10 is inserted. A regulation part 13 including a plurality of grooves 14 which are positioned continuously in an axial direction is formed in the shaft 10, and a regulated part 21 including a plurality of projections 22 which are respectively inserted to the plurality of grooves 14 is formed in the rotor core 20. The groove 14 is positioned while being displaced in the axial direction with respect to the other continued groove 14, and the projection 22 is positioned while being displaced in the axial direction with respect to the other continuous projection. The projection is inserted to the groove 14 in a state where a regulation key 40 is press-fitted between a first end face 14a of the groove 14 and a first side face 22a of the projection 22, and at least two second end faces 14b of the groove 14 are respectively in contact with a second side face of the projection 22.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a technical field relating to a rotating electric machine including a stator and a rotor that rotates relative to the stator, and a vehicle having the rotating electric machine. [Background technology]

[0002] Some vehicles, such as automobiles, are equipped with a rotating electric machine having a stator and a rotor (see, for example, Patent Document 1). In the rotor of the rotating electric machine described in Patent Document 1, a shaft is inserted into a rotor core, and end plates are arranged on both axial end faces of the rotor core, pressing the shaft from both sides in the axial direction, and the end plates are fixed to the rotor core with rivets, thereby restricting axial displacement of the rotor core relative to the shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-24319 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if a member that restricts the axial displacement of the rotor core is positioned on the axial outside of the rotor core, the axial length of the rotor will increase, making it more likely that the rotating electric machine will become larger.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to reduce the size of a rotating electrical machine while restricting the axial displacement of a rotor core. [Means for solving the problem]

[0006] One embodiment of the present invention is a rotating electric machine including a stator and a rotor that rotates relative to the stator, wherein the rotor has a shaft that serves as a rotation fulcrum and a rotor core through which the shaft is inserted, the shaft is formed with a restricting portion having a plurality of grooves that are positioned consecutively in the axial direction, and the rotor core is formed with a restricted portion having a plurality of protrusions that are positioned consecutively in the axial direction and that are inserted into each of the plurality of grooves, Each of the plurality of grooves The grooves are positioned in a state of being displaced in a direction around the axis relative to other adjacent grooves, Each of the plurality of protrusions The protrusions are positioned in a state of being displaced in a circumferential direction relative to the other consecutive protrusions, Each of the plurality of grooves the groove portion has a pair of first end faces which are end faces in the axial direction and at least one second end face which is an end face in the axial direction, Each of the plurality of protrusions The protrusion has a pair of first side surfaces that are side surfaces in the axial direction and a pair of second side surfaces that are side surfaces in the axial direction, Among the plurality of grooves, one groove having the second end surface is defined as a first groove, and a pair of grooves having the second end surfaces are defined as second grooves, The aforementioned 1st A restriction key is inserted into the groove in a press-fit state between the first end face and the first side face, and at least A pair of second grooves The second end faces are in contact with the second side faces, respectively.

[0007] Another embodiment of the present invention is a vehicle having a rotating electric machine, the rotating electric machine including a stator and a rotor that rotates relative to the stator, the rotor having a shaft that serves as a rotation fulcrum and a rotor core through which the shaft is inserted, the shaft having a regulating portion formed thereon with a plurality of grooves that are positioned consecutively in the axial direction, the rotor core having a regulated portion formed thereon with a plurality of protrusions that are positioned consecutively in the axial direction and that are inserted into each of the plurality of grooves, Each of the plurality of grooves The grooves are positioned in a state of being displaced in a direction around the axis relative to other adjacent grooves, Each of the plurality of protrusions The protrusions are positioned in a state of being displaced in a circumferential direction relative to the other consecutive protrusions, Each of the plurality of grooves the groove portion has a pair of first end faces which are end faces in the axial direction and at least one second end face which is an end face in the axial direction, Each of the plurality of protrusionsThe protrusion has a pair of first side surfaces that are side surfaces in the axial direction and a pair of second side surfaces that are side surfaces in the axial direction, Among the plurality of grooves, one groove having the second end surface is defined as a first groove, and a pair of grooves having the second end surfaces are defined as second grooves, The aforementioned 1st A restriction key is inserted into the groove in a press-fit state between the first end face and the first side face, and at least A pair of second grooves The second end faces are in contact with the second side faces, respectively. [Effects of the Invention]

[0008] According to the present invention, the axial displacement of the rotor core relative to the shaft is restricted by the restricting key press-fitted between the first end face of the restricting portion and the first side face of the regulated portion, and the axial displacement of the rotor core relative to the shaft is restricted by the at least two second end faces of the restricting portion contacting the second side faces of the regulated portion, respectively. Therefore, it is no longer necessary to attach a member that restricts the axial displacement of the rotor core to the axial outside of the rotor core, which makes it possible to shorten the axial length of the rotor and achieve a miniaturization of the rotating electric machine. [Brief explanation of the drawings]

[0009] [Figure 1] 2 to 12 show an embodiment of the rotating electric machine and vehicle of the present invention, and this figure shows a schematic configuration of the vehicle. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a cross-sectional view of a rotor core. [Figure 6] FIG. [Figure 7] 4 is a conceptual diagram showing a displacement state of two axially consecutive core portions in a rotor core. FIG. [Figure 8] FIG. [Figure 9]10 and 11 are conceptual diagrams showing a procedure for restricting displacement of the rotor core relative to the shaft, and show a state in which the protrusions are inserted into the grooves. [Figure 10] FIG. 10 is a diagram showing a state in which the rotor core is rotated relative to the shaft. [Figure 11] FIG. 10 is a diagram showing a state in which the restriction key is inserted into a groove. [Figure 12] FIG. 10 is a conceptual diagram showing another example of a rotor core and a shaft. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Vehicle Overview> First, the general configuration of the vehicle will be described (see FIG. 1).

[0011] The vehicle 100 is, for example, a hybrid electric vehicle, and has a rotating electric machine 101 and an engine (internal combustion engine) 102. The rotating electric machine 101 and the engine 102 are connected to a transmission 103 by a torque converter, a friction clutch, or the like (not shown). Note that if the vehicle 100 is an electric vehicle, the engine 102 is not provided.

[0012] A differential 104 is connected to the transmission 103. The differential 104 is, for example, a rear differential, and left and right rear drive shafts (not shown) are connected to the differential 104, and rear wheels 105, 105 are connected to the rear drive shafts, respectively. The driving force of the rotating electric machine 101 and the engine 102 is transmitted to the rear wheels 105, 105 via the differential 104 and the rear drive shafts.

[0013] Although the above describes the general configuration of a two-wheel drive (2WD) vehicle 100 in which the rear wheels are driven, in the case of a two-wheel drive (2WD) vehicle in which the front wheels are driven or a four-wheel drive (4WD) vehicle, a front differential is provided instead of or in addition to the differential 104. When a front differential is provided, left and right front wheel drive shafts (not shown) are connected to the front differential, and front wheels 106, 106 are connected to the front wheel drive shafts, respectively. In this case, the driving force of the rotating electric machine 101 and the engine 102 is transmitted to the front wheels 106, 106 via the front differential and the front wheel drive shafts.

[0014] <Configuration of rotating electric machine> Next, the configuration of the rotating electrical machine 101 will be described with reference to FIGS.

[0015] The rotating electric machine 101 has a housing 1, a stator 2, and a rotor 3 (see FIG. 2). The stator 2 is fixed to the housing 1, and the rotor 3 rotates relative to the stator 2.

[0016] The housing 1 has a box-shaped case body 4 that is open on one side and a cover body 5 that closes the opening 4a of the case body 4. The internal space of the housing 1 is formed as a storage space 1a in which the stator 2 is stored.

[0017] A support hole 4b is formed in the approximate center of the end opposite the opening 4a of the case body 4. An annular fixing groove (not shown) is formed on the inner surface of the case body 4 around the support hole 4b.

[0018] A support hole 5a that penetrates in the same direction as the support hole 4b is formed in the approximate center of the cover body 5. A ring-shaped fixing groove (not shown) that opens to the case body 4 side is formed in the cover body 5 around the support hole 5a.

[0019] The stator 2 has a cylindrical stator core 6 and a coil 7 attached to the stator core 6. The stator core 6 is formed, for example, by laminating a plurality of electromagnetic steel plates.

[0020] The rotor 3 has a shaft 10 serving as a rotation fulcrum and a cylindrical rotor core 20 through which the shaft 10 is inserted. Inside the rotor core 20, a magnetic body such as a magnet, which will be described later, is arranged.

[0021] The shaft 10 is supported by bearings 9, 9. The bearings 9, 9 are fitted into fixing grooves formed in the case body 4 and the cover body 5, respectively, and the outer rings are fixed thereto. Portions of the shaft 10 near both ends are inserted into the bearings 9, 9, and both ends of the shaft 10 are inserted into and supported by the support holes 4b of the case body 4 and the support holes 5a of the cover body 5, respectively. The bearings 9, 9 have the function of supporting the load of the rotor 3 and allowing the shaft 10 to rotate smoothly.

[0022] The shaft 10 has a large diameter portion 11, which is the portion excluding both end portions in the axial direction, and small diameter portions 12, 12 that are continuous with both end surfaces of the large diameter portion 11 in the axial direction and have a smaller diameter than the large diameter portion 11 (see Figures 2 to 4). The central axes of the large diameter portion 11 and the small diameter portions 12, 12 are aligned.

[0023] One end face in the axial direction of the large diameter portion 11, for example, the rear end face, is provided as an insertion-side end face 11a (see FIGS. 3 and 4).

[0024] Restricting portions 13, 13 are formed on the outer periphery of the large diameter portion 11. The restricting portions 13, 13 are positioned 180° apart in the axial direction. The restricting portions 13 are formed from one end portion having an insertion-side end face 11a of the large diameter portion 11 in the axial direction to the middle portion.

[0025] The restricting portion 13 has a plurality of grooves 14, 14 positioned consecutively in the axial direction. The grooves 14 are positioned in a state where they are displaced in the axial direction relative to the other consecutive grooves 14. The consecutive grooves 14, 14 are partially connected to each other in the axial direction. Of the multiple grooves 14, 14 in the restricting portion 13, one groove 14 is an open groove 14X and the other groove 14 is a closed groove 14Y. One axial end of the open groove 14X opens to the insertion-side end face 11a.

[0026] The grooves 14 are formed in a rectangular shape extending in the axial direction. The grooves 14 are formed by cutting, for example, with a cutting tool. The grooves 14, 14 have the same width and depth. The grooves 14, 14 may have the same or different lengths.

[0027] The groove 14 has a pair of first end faces 14a, 14a which are end faces in the axial direction, and at least one second end face 14b which is an end face in the axial direction.

[0028] The open groove portion 14X has one second end face 14b located on the closed groove portion 14Y side. The closed groove portion 14Y has a pair of second end faces 14b, 14b.

[0029] Regulated portions 21, 21 are formed on the inner periphery of the rotor core 20 (see FIGS. 5 and 6). The regulated portions 21, 21 are positioned 180° apart in the axial direction. The regulated portions 21 are formed from one end to the other end of the rotor core 20 in the axial direction.

[0030] The regulated portion 21 has a plurality of protrusions 22, 22 positioned consecutively in the axial direction. The protrusions 22 are positioned in a state where they are displaced in the axial direction relative to other consecutive protrusions 22.

[0031] The protrusions 22 protrude radially inward of the rotor core 20 and are formed in a rectangular shape extending in the axial direction. The protrusions 22, 22 have the same length, width, and height. The length of the protrusions 22 is the same as the length of the grooves 14. The width of the protrusions 22 is shorter than the width of the gaps connecting the axially continuous grooves 14, 14 in the restricting portion 13. Note that the lengths of the protrusions 22, 22 do not have to be the same.

[0032] The protrusion 22 has a pair of first side surfaces 22a, 22a which are side surfaces in the direction around the axis, and a pair of second side surfaces 22b, 22b which are side surfaces in the axial direction.

[0033] The portions of the rotor core 20 where the protrusions 22 are provided are provided as core portions 23 (see FIG. 5). Therefore, the rotor core 20 is made up of a plurality of core portions 23 that are continuous in the axial direction. The central axes of the plurality of core portions 23 are aligned.

[0034] The core portions 23 are displaced around the axis relative to other core portions 23 adjacent to them in the axial direction (see FIGS. 6 and 7). The angle by which one core portion 23 of two axially adjacent core portions 23 is displaced around the axis relative to the other core portion 23 is defined as a displacement angle Q. The displacement angle Q is, for example, 5 degrees.

[0035] Inside the core portion 23, a plurality of magnetic bodies 30 are arranged at equal intervals at a predetermined arrangement angle P in the axial direction (see FIGS. 6 and 7). Note that in FIGS. 6 and 7, the magnetic bodies 30 are shown with diagonal lines for ease of understanding. The arrangement angle P is, for example, 45 degrees.

[0036] The core portion 23 is formed by stacking a plurality of electromagnetic steel sheets 24 in the thickness direction (axial direction). The electromagnetic steel sheets 24 have a substantially circular annular portion 24a and convex portions 24b, 24b that protrude radially inward from the annular portion 24a (see FIG. 8). A plurality of holes 24c are formed in the annular portion 24a and positioned at equal intervals at a predetermined arrangement angle P in the circumferential direction (direction around the axis). With the plurality of electromagnetic steel sheets 24 stacked, the protrusion 22 is formed by the plurality of convex portions 24b, and the arrangement hole in which the magnetic body 30 is arranged is formed by the plurality of holes 24c.

[0037] When assembling the rotor core 20, a plurality of magnetic bodies 30 are arranged inside each of the core portions 23. The magnetic bodies 30 are arranged in arrangement holes formed by the plurality of holes 24c. Next, one of the core portions 23 is rotated by a displacement angle Q around the axis relative to the other core portion 23, and the core portions 23 are then joined together. As a result, in the rotor core 20, the core portions 23 are positioned displaced around the axis by the displacement angle Q with respect to the other core portions 23 adjacent to them in the axial direction, and the protrusions 22 are positioned displaced around the axis by the displacement angle Q with respect to the other protrusions 22 adjacent to them in the axial direction. In other words, a so-called step-skew structure in which the axially adjacent core portions 23 are positioned displaced around the axis relative to each other, and the regulated portion 21 having the protrusions 22 displaced around the axis, can be formed in a single process.

[0038] Next, a structure for restricting displacement of the rotor core 20 relative to the shaft 10 in the axial direction and the direction around the axis will be described with reference to FIGS.

[0039] The rotor core 20 is inserted onto the shaft 10 from the insertion end face 11a side (see FIG. 9). At this time, the protrusions 22 of the regulated portion 21 are inserted into the grooves 14 of the regulating portion 13, respectively. When the protrusions 22 are inserted into the grooves 14, respectively, the second end face 14b of the closed groove portion 14Y opposite the open groove portion 14X comes into contact with the second side face 22b of the protrusion 22. The second end face 14b of the closed groove portion 14Y comes into contact with the second side face 22b of the protrusion 22, thereby positioning the rotor core 20 with respect to the shaft 10 in the axial direction. Note that at this time, the second end face 14b of the open groove portion 14X may come into contact with the second side face 22b of the protrusion 22.

[0040] Once the protrusions 22 of the regulated portion 21 are inserted into the grooves 14 of the regulating portion 13, the rotor core 20 is then rotated in one direction around the shaft 10 (see FIG. 10 ). At this time, the direction in which the rotor core 20 rotates around the shaft 10 is referred to as a first direction. When the rotor core 20 is rotated in the first direction around the shaft 10, one first end face 14a of the open groove 14X comes into contact with one first side face 22a of the protrusion 22. The first side face 22a of the protrusion 22 comes into contact with the first end face 14a of the open groove 14X, thereby positioning the rotor core 20 around the shaft 10. At this time, the second end faces 14b of the closed groove 14Y come into contact with the second side faces 22b of the protrusion 22, respectively. At this time, the first end face 14a of the closed groove portion 14Y may contact the first side face 22a of the protrusion 22.

[0041] With the rotor core 20 rotated relative to the shaft 10, the restricting key 40 is inserted into the opening groove 14X (see FIG. 11). The restricting key 40 inserted into the opening groove 14X is press-fitted between the other first end face 14a of the opening groove 14X and the other first side face 22a of the protrusion 22.

[0042] The restricting key 40 is formed, for example, in a shape that tapers slightly in the insertion direction. This makes it easier to press-fit the restricting key 40, improving workability during manufacturing of the rotating electric machine 101. The length of the restricting key 40 is, for example, the same as the length of the opening groove portion 14X. Note that the length of the restricting key 40 may be shorter than the opening groove portion 14X. In this case, it is possible to reduce the weight of the rotor 3 and reduce the manufacturing cost of the rotating electric machine 101. Furthermore, this makes it easier to press-fit the restricting key 40, further improving workability during manufacturing of the rotating electric machine 101.

[0043] As described above, in the rotating electric machine 101, the regulating key 40 is inserted into the groove portion 14 (opening groove portion 14X) in a pressed-fit state between the first end face 14a and the first side face 22a, and at least two second end faces 14b, 14b are in contact with the second side faces 22b, 22b, respectively (see Figure 11).

[0044] As a result, the restricting key 40 press-fitted between the first end face 14a of the restricting portion 13 and the first side face 22a of the regulated portion 21 restricts displacement of the rotor core 20 in the axial direction relative to the shaft 10, and the at least two second end faces 14b, 14b of the restricting portion 13 contact the second side faces 22b, 22b of the regulated portion 21, respectively, restricting displacement of the rotor core 20 in the axial direction relative to the shaft 10. Therefore, there is no need to attach a member for restricting the axial displacement of the rotor core 20 to the axial outside of the rotor core 20, which makes it possible to shorten the axial length of the rotor 3 and reduce the size of the rotating electric machine 101. A vehicle 100 having such a rotating electric machine 101 can have greater design freedom. Furthermore, the reduction in the number of parts reduces the manufacturing costs of the rotating electric machine 101 and the vehicle 100.

[0045] Although the above example shows the two second end faces 14b of the closed groove portion 14Y abutting the second side faces 22b of the protrusion 22, the second end face 14b of the closed groove portion 14Y on the open groove portion 14X side and the second end face 14b of the open groove portion 14X may abut the second side faces 22b of the protrusions 22. In this case, for example, the length of the protrusion 22 inserted into the closed groove portion 14Y is shorter than the length of the closed groove portion 14Y, and the width of the protrusion 22 inserted into the open groove portion 14X is longer than the width of the gap in the restricting portion 13 where the axially continuous grooves 14 communicate. When the rotor core 20 having such protrusions 22, 22 is inserted onto the shaft 10, the second end face 14b of the opening groove 14X contacts the second side face 22b of the protrusion 22, thereby positioning the rotor core 20 in the axial direction relative to the shaft 10. When the rotor core 20 is rotated in a first direction relative to the shaft 10, one first end face 14a of the opening groove 14X contacts one first side face 22a of the protrusion 22, while the second end face 14b of the opening groove 14X remains in contact with the second side face 22b of the protrusion 22. At this time, the second end face 14b of the closed groove 14Y on the opening groove 14X side contacts the second side face 22b of the protrusion 22. In this state, the restriction key 40 is press-fitted between the first end face 14a of the opening groove 14X and the first side face 22a of the protrusion 22.

[0046] Furthermore, in the rotating electric machine 101, a plurality of regulating portions 13, 13 are formed on the shaft 10 at equal intervals around the axis, and a plurality of regulated portions 21, 21 equal in number to the regulating portions 13, 13 are formed on the rotor core 20 at equal intervals around the axis (see FIGS. 4 and 6 ). As a result, the regulated portions 21, 21 are inserted into the regulating portions 13, 13 at positions equally spaced around the axis of the rotor 3. This ensures a good balance of the rotor 3 around the axis, and a stable rotation of the rotor 3. Note that although the above example shows two regulating portions 13 and the same number of regulated portions 21, three or more regulating portions 13 may be formed on the shaft 10 at equal intervals around the axis, and the rotor core 20 may have the same number of regulated portions 21 as the regulating portions 13, spaced apart around the axis. Alternatively, one regulating portion 13 and one regulated portion 21 may be formed.

[0047] Furthermore, in the rotating electric machine 101, the rotor core 20 has a plurality of core portions 23, 23 that are continuous in the axial direction, and the core portions 23 are formed by stacking a plurality of electromagnetic steel sheets 24, each having a convex portion 24b, in the axial direction, and the core portions 23 are displaced in the axial direction relative to other core portions 23 that are continuous in the axial direction, and the protrusions 22 are formed by the stacked plurality of convex portions 24b. This makes it possible to form the rotor core 20, which has a plurality of protrusions 22 that are displaced in the axial direction relative to other protrusions 22 that are continuous in the axial direction, using a single type of electromagnetic steel sheet 24. Therefore, there is no need to manufacture different types of electromagnetic steel sheets for each of the protrusions 22, 22, and manufacturing costs can be reduced.

[0048] Furthermore, in the rotating electric machine 101, the displacement angle Q is set smaller than the arrangement angle P (see FIG. 7). As a result, the core portion 23 is displaced relative to the other core portions 23 adjacent to it in the axial direction by the displacement angle Q, which is smaller than the arrangement angle P, so that the magnetic bodies 30 arranged inside each core portion 23 are positioned in a state displaced in the axial direction relative to the magnetic bodies 30 arranged inside each other core portions 23 adjacent to it in the axial direction. Therefore, the skew effect can suppress the generation of cogging torque and torque ripple when the rotating electric machine 101 is driven.

[0049] The frequency components of the cogging torque and torque ripple reduced by the skew effect differ depending on, for example, the dimensions of the protrusion 22, the displacement angle Q between two consecutive core portions 23, 23, and the number of core portions 23 that make up the rotor core 20.

[0050] Furthermore, in the rotating electric machine 101, the multiple protrusions 22, 22 in the regulated portion 21 are all the same length. This causes the axial lengths of the core portions 23, 23 on which the protrusions 22, 22 are respectively provided to be the same. This makes it easy to estimate the frequency component of the cogging torque, and makes it possible to suppress the generation of cogging torque as much as possible by, for example, setting the displacement angle Q according to the frequency component of the estimated cogging torque.

[0051] Additionally, in the rotating electric machine 101, the grooves 14 and the protrusions 22 are each formed in a rectangular shape. This facilitates the manufacturing of the grooves 14 and the protrusions 22, thereby reducing the manufacturing cost of the rotating electric machine 101. Furthermore, the rotor core 20 can be positioned with respect to the shaft 10 with high precision.

[0052] Although the above example shows the rotor core 20 being composed of two core portions 23, 23, the rotor core 20 in the rotating electric machine 101 may also be composed of three or more core portions 23 (see Figure 12).

[0053] For example, the rotor core 20 may be configured with three core portions 23, 23, 23, and the regulated portion 21 may have three protrusions 22, 22, 22 positioned consecutively in the axial direction. The protrusions 22 are positioned in a state displaced in the axial direction relative to the other consecutive protrusions 22. Note that the displacement angle Q of one core portion 23 relative to the other core portion 23 of two axially consecutive core portions 23, 23 may be the same or different for each of the two axially consecutive core portions 23, 23.

[0054] In this configuration, the restricting portion 13 has three grooves 14, 14, 14 positioned consecutively in the axial direction. Each groove 14 is positioned displaced around the axis relative to the other consecutive grooves 14. The consecutive grooves 14, 14 are partially connected to each other in the axial direction. The groove 14 positioned between the open groove 14X and the closed groove 14Y is referred to as the intermediate groove 14Z.

[0055] In a configuration in which the protrusions 22 of the regulated portion 21 are inserted into the grooves 14 of the regulating portion 13, respectively, when the rotor core 20 is inserted onto the shaft 10, the two protrusions 22 at the tip end side in the insertion direction of the regulated portion 21 are first inserted into the open groove portion 14X and the intermediate groove portion 14Z, respectively. When the protrusions 22 are inserted into the open groove portion 14X and the intermediate groove portion 14Z, respectively, the second end face 14b of the intermediate groove portion 14Z on the closed groove portion 14Y side comes into contact with the second side face 22b of the protrusion 22. Note that at this time, the second end face 14b of the open groove portion 14X may also come into contact with the second side face 22b of the protrusion 22.

[0056] When the second end face 14b of the intermediate groove portion 14Z on the closed groove portion 14Y side comes into contact with the second side face 22b of the protrusion 22, the rotor core 20 is rotated in a first direction relative to the shaft 10. When the rotor core 20 is rotated in the first direction relative to the shaft 10, the second end face 14b of the intermediate groove portion 14Z on the closed groove portion 14Y side moves away from the second side face 22b of the protrusion 22. When the second end face 14b of the intermediate groove portion 14Z on the closed groove portion 14Y side moves away from the second side face 22b of the protrusion 22, the rotor core 20 is further inserted onto the shaft 10, and the protrusions 22, 22, 22 are inserted into the open groove portion 14X, the intermediate groove portion 14Z, and the closed groove portion 14Y, respectively. When the protrusions 22, 22, 22 are inserted into the open groove portion 14X, the intermediate groove portion 14Z, and the closed groove portion 14Y, respectively, the second end face 14b of the closed groove portion 14Y opposite the open groove portion 14X comes into contact with the second side face 22b of the protrusion 22, thereby positioning the rotor core 20 in the axial direction with respect to the shaft 10. Note that at this time, the second end face 14b of the open groove portion 14X and the second end faces 14b, 14b of the intermediate groove portion 14Z on the closed groove portion 14Y side may each come into contact with the second side face 22b of the protrusion 22.

[0057] Once the protrusions 22 of the regulated portion 21 are inserted into the grooves 14 of the regulating portion 13, the rotor core 20 is then further rotated in the first direction relative to the shaft 10. When the rotor core 20 is rotated in the first direction relative to the shaft 10, one first end face 14a of the open groove 14X comes into contact with one first side face 22a of the protrusion 22. The first side face 22a of the protrusion 22 comes into contact with the first end face 14a of the open groove 14X, thereby positioning the rotor core 20 in the axial direction relative to the shaft 10. At this time, the second end faces 14b of the closed groove 14Y come into contact with the second side faces 22b of the protrusion 22, respectively. One first end face 14a of the closed groove portion 14Y and one first end face 14a of the intermediate groove portion 14Z may be in contact with the first side faces 22a, 22a of the protrusion 22. Also, the second end face 14b of the intermediate groove portion 14Z on the open groove portion 14X side may be in contact with the second side face 22b of the protrusion 22.

[0058] When the rotor core 20 is rotated relative to the shaft 10, the restricting key 40 is inserted into the opening groove portion 14X. The restricting key 40 inserted into the opening groove portion 14X is press-fitted between the other first end face 14a of the opening groove portion 14X and the other first side face 22a of the protrusion 22.

[0059] In this way, even when the rotor core 20 is composed of three or more core portions 23 and the regulated portion 21 has three or more protrusions 22, the axial displacement of the rotor core 20 relative to the shaft 10 is restricted by the restricting key 40 press-fitted between the first end face 14a of the restricting portion 13 and the first side face 22a of the regulated portion 21, and the axial displacement of the rotor core 20 relative to the shaft 10 is restricted by the at least two second end faces 14b, 14b of the restricting portion 13 contacting the second side faces 22b, 22b of the regulated portion 21, respectively. Therefore, there is no need to attach a member that restricts the axial displacement of the rotor core 20 to the outside of the rotor core 20 in the axial direction, which makes it possible to shorten the axial length of the rotor 3 and reduce the size of the rotating electric machine 101.

[0060] Furthermore, by changing the number of core portions 23, the displacement angle Q, and the dimensions of the protrusions in this manner, it is possible to reduce the size of the rotating electric machine 101 while regulating the axial and axial displacement of the rotor core 20 relative to the shaft 10, and to realize a variety of skews.

[0061] The rotor core 20 may be composed of four or more core portions 23. In order to improve the output performance of the rotating electric machine 101, two or more core portions 23 each having a protrusion 22 may be joined to a core portion 23 having no protrusion 22.

[0062] In addition, the above example shows an example in which the regulating portion 13 is formed from one end to the middle portion in the axial direction of the large diameter portion 11 of the shaft 10, but in order to further reduce the size of the rotor 3 in the axial direction, it is also possible to shorten the other end of the large diameter portion 11 where the regulating portion 13 is not formed, or to configure the large diameter portion 11 so that there is no portion where the regulating portion 13 is not formed. [Explanation of symbols]

[0063] 1. Housing 2 Stator 3 rotor 10 shaft 13 Regulatory Department 14 Groove 14a first end face 14b second end face 20 rotor core 21 Regulated part 22 protrusion 22a First Aspect 22b Second Aspect 24 Electrical steel sheet 40 Restriction Key 100 vehicles 101 Rotating Electric Machine

Claims

1. A rotating electric machine including a stator and a rotor that rotates relative to the stator, The rotor has a shaft serving as a rotation fulcrum and a rotor core through which the shaft is inserted, The shaft is formed with a restricting portion having a plurality of grooves positioned successively in the axial direction, The rotor core is formed with a restricted portion having a plurality of protrusions that are positioned consecutively in the axial direction and are inserted into the plurality of grooves, respectively; Each groove of the plurality of grooves is positioned in a state of being displaced in a direction around the axis relative to other consecutive grooves, Each of the plurality of protrusions is positioned in a state of being displaced in a circumferential direction relative to other consecutive protrusions, Each of the plurality of grooves has a pair of first end faces that are end faces in a direction around the axis and at least one second end face that is an end face in an axial direction, Each of the plurality of protrusions has a pair of first side surfaces that are side surfaces in a direction around the axis and a pair of second side surfaces that are side surfaces in an axial direction, Among the plurality of grooves, one groove having the second end surface is defined as a first groove, and a pair of grooves having the second end surfaces are defined as second grooves, a restriction key is inserted into the first groove portion in a press-fit state between the first end face and the first side face, A pair of second end surfaces of at least one of the second groove portions are in contact with the second side surfaces, respectively. Rotating electric motor.

2. The shaft has a plurality of restricting portions formed at equal intervals in a direction around the shaft, The rotor core is provided with a plurality of restricting portions and the same number of restricted portions formed at equal intervals in the axial direction. The rotating electric machine according to claim 1 .

3. the rotor core has a plurality of core portions that are continuous in the axial direction, the core portion is formed by stacking electromagnetic steel sheets having convex portions in the axial direction, The core portion is displaced in a direction around the axis relative to other core portions that are consecutive in the axial direction, The protrusion is constituted by a plurality of the convex portions stacked one on top of the other. The rotating electric machine according to claim 1 or 2.

4. A plurality of magnetic bodies are disposed inside the core portion at equal intervals at a predetermined angle in a direction around the axis, the predetermined angle is a first angle, When a displacement angle of one of the core portions relative to the other core portion in the axial direction is defined as a second angle, The second angle is smaller than the first angle. The rotating electric machine according to claim 3 .

5. A vehicle having a rotating electric machine, the rotating electric machine includes a stator and a rotor that rotates relative to the stator, The rotor has a shaft serving as a rotation fulcrum and a rotor core through which the shaft is inserted, The shaft is formed with a restricting portion having a plurality of grooves positioned successively in the axial direction, The rotor core is formed with a restricted portion having a plurality of protrusions that are positioned consecutively in the axial direction and are inserted into the plurality of grooves, respectively; Each groove of the plurality of grooves is positioned in a state of being displaced in a direction around the axis relative to other consecutive grooves, Each of the plurality of protrusions is positioned in a state of being displaced in a circumferential direction relative to other consecutive protrusions, Each of the plurality of grooves has a pair of first end faces that are end faces in a direction around the axis and at least one second end face that is an end face in an axial direction, Each of the plurality of protrusions has a pair of first side surfaces that are side surfaces in a direction around the axis and a pair of second side surfaces that are side surfaces in an axial direction, Among the plurality of grooves, one groove having the second end surface is defined as a first groove, and a pair of grooves having the second end surfaces are defined as second grooves, a restriction key is inserted into the first groove portion in a press-fit state between the first end face and the first side face, A pair of second end surfaces of at least one of the second groove portions are in contact with the second side surfaces, respectively. vehicle.

Images