JP2023017392A - Rotary electric machine and vehicle - Google Patents

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 The present invention relates to a technical field of a rotating electric machine including a stator and a rotor rotated with respect to the stator, and a vehicle having the rotating electric machine.

2. Description of the Related Art 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 a rotary electric machine disclosed in Patent Document 1, end plates are arranged on both axial end surfaces of the rotor core in a state in which the shaft is inserted through the rotor core, pressing the shaft from both sides in the axial direction, The axial displacement of the rotor core with respect to the shaft is restricted by fixing the end plates to the rotor core with rivets.

JP 2011-24319 A

However, if the member for restricting the displacement of the rotor core in the axial direction is arranged on the outer side of the rotor core in the axial direction, the length of the rotor in the axial direction becomes long, which tends to increase the size of the rotary electric machine. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the size of a rotating electric machine while restricting axial displacement of a rotor core.

An embodiment of the present invention is a rotating electrical machine comprising a stator and a rotor rotated with respect to the stator, wherein the rotor comprises a shaft serving as a fulcrum of rotation and a rotor core through which the shaft is inserted. The shaft is formed with a restricting portion having a plurality of grooves positioned continuously in the axial direction, and the rotor core is positioned continuously in the axial direction and is inserted into each of the plurality of grooves. A regulated portion having a plurality of protrusions is formed, the groove portion is positioned in a state of being displaced in the axial direction with respect to the other continuous groove portions, and the protrusion is positioned relative to the other continuous protrusion portions. The groove portion has a pair of first end faces that are end faces in the axial direction and at least one second end face that is end faces in the axial direction, and the projection The portion has a pair of first side surfaces, which are side surfaces in the axial direction, and a pair of second side surfaces, which are side surfaces in the axial direction. It is inserted in a state of being press-fitted between the side surfaces, and at least two of the second end surfaces are in contact with the second side surfaces.

Another embodiment of the present invention is a vehicle having a rotating electric machine, wherein the rotating electric machine includes a stator and a rotor rotated with respect to the stator, and the rotor serves as a rotation fulcrum. The rotor core includes a shaft and a rotor core through which the shaft is inserted, the shaft is formed with a regulating portion having a plurality of grooves positioned continuously in the axial direction, and the rotor core is positioned continuously in the axial direction. A regulated portion having a plurality of protrusions that are respectively inserted into the plurality of grooves is formed, the grooves are positioned in a state of being displaced in a direction around the axis with respect to the other continuous grooves, and the protrusions are Positioned in a state displaced in the axial direction with respect to the other continuous protrusions, the groove portion has a pair of first end faces that are end faces in the axial direction and at least one second end face that is an end face in the axial direction. and the protrusion has a pair of first side surfaces, which are side surfaces in the axial direction, and a pair of second side surfaces, which are side surfaces in the axial direction. It is inserted between the first end surface and the first side surface in a press-fit state, and at least two of the second end surfaces are in contact with the second side surface.

According to the present invention, displacement of the rotor core in the axial direction with respect to the shaft is restricted by the restriction key press-fitted between the first end surface of the restriction portion and the first side surface of the restricted portion. Axial displacement of the rotor core with respect to the shaft is regulated by the contact of the at least two second end surfaces with the second side surfaces of the regulated portion. Therefore, it is not necessary to attach a member for restricting the displacement of the rotor core in the axial direction to the outer side of the rotor core in the axial direction. be able to.

FIG. 2 to FIG. 12 show an embodiment of a rotating electric machine and a vehicle according to the present invention, and this figure shows a schematic configuration of the vehicle. 1 is an exploded perspective view of a rotary electric machine; FIG. FIG. 4 is a plan view of the shaft; Fig. 2 is a perspective view of a shaft; 3 is a cross-sectional view of a rotor core; FIG. It is a front view of a rotor core. FIG. 3 is a conceptual diagram showing a displacement state of two axially continuous core portions in a rotor core; 1 is a front view of an electromagnetic steel sheet; FIG. 10 and 11 are conceptual diagrams showing the procedure for restricting the displacement of the rotor core with respect to the shaft, and this diagram shows a state in which the projections are inserted into the grooves. FIG. 4 is a diagram showing a state in which the rotor core is rotated with respect to the shaft; FIG. 10 is a diagram showing a state in which the regulation key is inserted into the groove; FIG. 4 is a conceptual diagram showing another example of a rotor core and a shaft;

<General configuration of vehicle>
First, the schematic configuration of the vehicle will be described (see FIG. 1).

A vehicle 100 is, for example, a hybrid electric vehicle, and has a rotating electric machine 101 and an engine (internal combustion engine) 102 . A transmission 103 is connected to the rotary electric machine 101 and the engine 102 by a torque converter, a friction clutch, or the like (not shown). Incidentally, when the vehicle 100 is an electric vehicle, the engine 102 is not provided.

A differential device 104 is connected to the transmission 103 . The differential device 104 is, for example, a rear differential device. Left and right rear wheel drive shafts (not shown) are connected to the differential device 104, and rear wheels 105, 105 are connected to the rear wheel drive shafts, respectively. The driving force of the rotating electrical machine 101 and the engine 102 is transmitted to rear wheels 105, 105 via a differential device 104 and a rear wheel drive shaft.

Although the schematic configuration of the two-wheel drive (2WD) type vehicle 100 in which the rear wheels are driven has been described above, a two-wheel drive (2WD) type or four-wheel drive (4WD) type vehicle in which the front wheels are driven is described. In the case of , a front differential is provided in place of or together with differential 104 . When a front differential device is provided, left and right front wheel drive shafts (not shown) are connected to the front differential device, and front wheels 106, 106 are connected to the front wheel drive shafts, respectively. In this case, the driving force of the rotary electric machine 101 and the engine 102 is transmitted to the front wheels 106, 106 via the front differential device and the front wheel drive shaft.

<Configuration of rotating electric machine>
Next, the configuration of the rotating electrical machine 101 will be described with reference to FIGS. 2 to 8. FIG.

A rotating electrical machine 101 has a housing 1, a stator 2, and a rotor 3 (see FIG. 2). A stator 2 is fixed to the housing 1 and a rotor 3 is rotated relative to the stator 2 .

The housing 1 has a box-shaped case body 4 with one opening and a cover body 5 closing the opening 4 a of the case body 4 . An internal space of the housing 1 is formed as a storage space 1a in which the stator 2 is stored.

A support hole 4b is formed substantially in the center of the end of the case body 4 opposite to the opening 4a. An annular fixing groove (not shown) is formed around the support hole 4b on the inner surface side of the case body 4. As shown in FIG.

A support hole 5a is formed in the substantially central portion of the cover body 5 so as to penetrate in the same direction as the support hole 4b. A ring-shaped fixing groove (not shown) that opens toward the case body 4 is formed in the cover body 5 around the support hole 5a.

The stator 2 has a cylindrical stator core 6 and coils 7 attached to the stator core 6 . The stator core 6 is formed by laminating a plurality of electromagnetic steel sheets, for example.

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, magnetic bodies such as magnets, which will be described later, are arranged.

The shaft 10 is supported by bearings 9,9. The bearings 9, 9 are fitted into fixed grooves formed in the case body 4 and the cover body 5, respectively, and the outer rings thereof are fixed. Both end portions of the shaft 10 are inserted through the bearings 9, 9, respectively, and both end portions of the shaft 10 are inserted into the support hole 4b of the case body 4 and the support hole 5a of the cover body 5 and supported. The bearings 9, 9 have the function of receiving the load of the rotor 3 and allowing the shaft 10 to rotate smoothly.

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

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

Regulating portions 13 , 13 are formed on the outer peripheral portion of the large diameter portion 11 . The restricting portions 13, 13 are positioned 180° apart in the axial direction. The restricting portion 13 is formed from one end portion having an insertion side end surface 11a in the axial direction of the large diameter portion 11 to an intermediate portion thereof.

The restricting portion 13 has a plurality of groove portions 14, 14 which are continuously positioned in the axial direction. The groove portion 14 is positioned in a state displaced in the axial direction with respect to the other continuous groove portions 14 . The continuous grooves 14, 14 are communicated part by part in the axial direction. Of the plurality of grooves 14, 14 in the restricting portion 13, one groove 14 is defined as an opening side groove 14X and the other groove 14 is defined as a closing side groove 14Y. One end of the opening-side groove portion 14X in the axial direction is open to the insertion side end surface 11a.

The groove portion 14 is formed in a rectangular shape extending in the axial direction. The groove portion 14 is formed by cutting with a cutting tool or the like, for example. The grooves 14, 14 have the same width and depth. The grooves 14, 14 may have the same or different lengths.

The groove portion 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.

The opening-side groove portion 14X has one second end surface 14b located on the closed-side groove portion 14Y side. The closed groove portion 14Y has a pair of second end faces 14b, 14b.

Regulated portions 21, 21 are formed on the inner peripheral portion of the rotor core 20 (see FIGS. 5 and 6). The regulated portions 21, 21 are positioned apart from each other by 180° in the axial direction. The regulated portion 21 is formed from one end to the other end of the rotor core 20 in the axial direction.

The regulated portion 21 has a plurality of protrusions 22, 22 that are continuously positioned in the axial direction. The protrusion 22 is positioned in a state of being displaced in the axial direction with respect to the other continuous protrusions 22 .

The protrusion 22 protrudes radially inward of the rotor core 20 and has a rectangular shape extending in the axial direction. The protrusions 22, 22 have the same length, width and height. The length of the protrusion 22 is made the same as the length of the groove 14 . The width of the protrusion 22 is made shorter than the width of the gap through which the axially continuous grooves 14 , 14 communicate with each other in the restricting portion 13 . Note that the lengths of the protrusions 22, 22 may not be the same.

The protrusion 22 has a pair of first side surfaces 22a, 22a that are side surfaces in the axial direction, and a pair of second side surfaces 22b, 22b that are side surfaces in the axial direction.

The portions of the rotor core 20 provided with the protrusions 22, 22 are provided as core portions 23, 23, respectively (see FIG. 5). Therefore, the rotor core 20 is composed of a plurality of core portions 23, 23 that are continuous in the axial direction. The central axes of the plurality of core portions 23, 23 are aligned.

The core portion 23 is displaced in the axial direction with respect to the other core portions 23 that are continuous in the axial direction (see FIGS. 6 and 7). A displacement angle Q is defined as an angle by which one core portion 23 is displaced from the other core portion 23 in the axial direction of the two core portions 23, 23 that are continuous in the axial direction. The displacement angle Q is, for example, 5 degrees.

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). In FIGS. 6 and 7, the magnetic body 30 is hatched for easy understanding. The arrangement angle P is, for example, 45 degrees.

The core portion 23 is configured by laminating a plurality of electromagnetic steel sheets 24 in the thickness direction (axial direction). The electromagnetic steel plate 24 has a substantially annular annular portion 24a and convex portions 24b, 24b projecting radially inwardly from the annular portion 24a (see FIG. 8). A plurality of holes 24c are formed in the annular portion 24a so as to be equally spaced apart at a predetermined arrangement angle P in the circumferential direction (direction around the axis). In a state in which a plurality of electromagnetic steel sheets 24 are laminated, a plurality of convex portions 24b form a projecting portion 22, and a plurality of hole portions 24c form an arrangement hole in which the magnetic body 30 is arranged.

When assembling the rotor core 20, a plurality of magnetic bodies 30 are arranged inside the core portions 23, 23, respectively. The magnetic body 30 is arranged in the arrangement hole formed by the plurality of holes 24c. Next, after rotating one core portion 23 relative to the other core portion 23 by a displacement angle Q in the axial direction, the core portions 23, 23 are joined together. As a result, in the rotor core 20, the core portion 23 is displaced at a displacement angle Q in the axial direction with respect to the other core portion 23 that is continuous in the axial direction, and the protruding portion 22 is continuous in the axial direction. is displaced at a displacement angle Q in the direction around the axis with respect to the projection 22 of . That is, a so-called step-skew structure in which axially continuous core portions 23, 23 are displaced from each other in the axial direction, and a regulated portion 21 having protrusions 22, 22 displaced in the axial direction. can be formed in one step.

Next, a structure for restricting displacement of the rotor core 20 with respect to the shaft 10 in the axial direction and the axial direction will be described with reference to FIGS. 9 to 11. FIG.

The rotor core 20 is inserted into the shaft 10 from the inserted end surface 11a (see FIG. 9). At this time, the protrusions 22, 22 of the regulated portion 21 are inserted into the grooves 14, 14 of the regulating portion 13, respectively. When the protrusions 22 , 22 are inserted into the grooves 14 , 14 respectively, the second end surface 14 b of the closing-side groove 14 Y opposite to the opening-side groove 14 X contacts the second side surface 22 b of the protrusion 22 . The rotor core 20 is axially positioned with respect to the shaft 10 by the contact of the second end surface 14b of the closed groove 14Y with the second side surface 22b of the projection 22. As shown in FIG. At this time, the second end surface 14b of the opening-side groove portion 14X may come into contact with the second side surface 22b of the protrusion 22. As shown in FIG.

When the projections 22, 22 of the regulated portion 21 are inserted into the grooves 14, 14 of the regulating portion 13, respectively, 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 is rotated with respect to the shaft 10 is defined as the first direction. When rotor core 20 is rotated in the first direction with respect to shaft 10 , one first end surface 14 a of opening-side groove 14 X contacts one first side surface 22 a of protrusion 22 . Positioning of the rotor core 20 with respect to the shaft 10 in the axial direction is performed by the contact of the first side surface 22a of the protrusion 22 with the first end surface 14a of the opening-side groove portion 14X. Also, at this time, the second end surfaces 14b, 14b of the closed-side groove portion 14Y come into contact with the second side surfaces 22b, 22b of the protrusion 22, respectively. At this time, one first end surface 14a of the closed-side groove portion 14Y may come into contact with the first side surface 22a of the protrusion 22. As shown in FIG.

With the rotor core 20 rotated with respect to the shaft 10, the restriction key 40 is inserted into the opening-side groove portion 14X (see FIG. 11). The restriction key 40 inserted into the opening-side groove portion 14X is press-fitted between the other first end surface 14a of the opening-side groove portion 14X and the other first side surface 22a of the projection 22 .

The regulation key 40 is formed, for example, in a shape that tapers slightly as it goes in the insertion direction. As a result, the press-fitting operation of the regulation key 40 is facilitated, and workability in manufacturing the rotating electric machine 101 can be improved. The length of the regulation key 40 is, for example, the same as the length of the opening-side groove portion 14X. Note that the regulation key 40 may have a length shorter than that of the opening-side groove portion 14X. In this case, the weight of the rotor 3 can be reduced, and the manufacturing cost of the rotating electric machine 101 can be reduced. In addition, the press-fitting operation of the regulation key 40 is further facilitated, and workability in manufacturing the rotating electric machine 101 can be further improved.

As described above, in the rotary electric machine 101, the restriction key 40 is inserted into the groove portion 14 (opening side groove portion 14X) in a state of being press-fitted between the first end surface 14a and the first side surface 22a, and at least two second are in contact with second side surfaces 22b, 22b, respectively (see FIG. 11).

As a result, displacement of the rotor core 20 in the axial direction with respect to the shaft 10 is regulated by the regulating key 40 press-fitted between the first end surface 14a of the regulating portion 13 and the first side surface 22a of the regulated portion 21. At least two second end faces 14b, 14b of the regulating portion 13 are in contact with the second side surfaces 22b, 22b of the regulated portion 21, respectively, so that axial displacement of the rotor core 20 with respect to the shaft 10 is regulated. Therefore, it is not necessary to attach a member for restricting axial displacement of the rotor core 20 to the outside of the rotor core 20 in the axial direction. Miniaturization can be achieved. In vehicle 100 having such rotating electrical machine 101, the degree of freedom in design can be improved. In addition, the manufacturing cost of rotating electric machine 101 and vehicle 100 can be reduced by reducing the number of parts.

In the above description, the two second end surfaces 14b, 14b of the closed groove 14Y are in contact with the second side surfaces 22b, 22b of the protrusion 22, respectively. The second end surface 14b on the side and the second end surface 14b of the opening-side groove portion 14X may be in contact with the second side surfaces 22b, 22b of the protrusions 22, 22, respectively. In this case, for example, the length of the protrusion 22 inserted into the closed-side groove 14Y is shorter than the length of the closed-side groove 14Y, and the width of the protrusion 22 inserted into the opening-side groove 14X is It is made longer than the width of the gap through which the axially continuous grooves 14, 14 communicate. When the rotor core 20 having such projections 22, 22 is inserted into the shaft 10, the second end face 14b of the opening-side groove 14X contacts the second side surface 22b of the projection 22, thereby Axial positioning is performed. When the rotor core 20 is rotated in the first direction with respect to the shaft 10, the second end surface 14b of the opening-side groove 14X remains in contact with the second side surface 22b of the protrusion 22, and the opening-side groove 14X is rotated. is in contact with one first side surface 22a of the protrusion 22 . At this time, the second end face 14b of the closed groove 14Y on the side of the open groove 14X comes into contact with the second side surface 22b of the protrusion 22. As shown in FIG. In this state, the regulation key 40 is press-fitted between the first end surface 14a of the opening-side groove portion 14X and the first side surface 22a of the protrusion 22. As shown in FIG.

In the rotary electric machine 101, a plurality of regulating portions 13, 13 are formed on the shaft 10 at equal intervals in the axial direction, and the rotor core 20 has the same number of regulated portions 21 and 21 as the plurality of regulating portions 13, 13. 21 are formed at equal intervals in the axial direction (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 apart in the axial direction of the rotor 3, respectively. Therefore, the rotor 3 is kept in good balance in the direction around the axis, and the stable rotation of the rotor 3 can be secured. In addition, although an example in which two regulating portions 13 and the same number of regulated portions 21 are formed is shown above, three or more regulating portions 13 are formed on the shaft 10 at equal intervals in the axial direction. In the rotor core 20, the same number of restricted portions 21 as the restricting portions 13 may be formed at regular intervals in the axial direction. Further, one regulating portion 13 and one regulated portion 21 may be formed.

Further, 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 portion 23 is formed by laminating a plurality of electromagnetic steel plates 24 having convex portions 24b in the axial direction, The core portion 23 is displaced in the axial direction with respect to the other core portions 23 that are continuous in the axial direction, and the projecting portion 22 is composed of a plurality of convex portions 24b stacked on top of each other. As a result, the rotor core 20 having a plurality of projections 22 displaced in the axial direction with respect to other projections 22 that are continuous in the axial direction can be formed from one type of electromagnetic steel plate 24 . Therefore, it is not necessary to manufacture different types of magnetic steel sheets for each of the protrusions 22, 22, and the manufacturing cost can be reduced.

Furthermore, in the rotary electric machine 101, the displacement angle Q is made smaller than the arrangement angle P (see FIG. 7). As a result, the core portion 23 is displaced with respect to the other core portions 23 that are continuous in the axial direction at the displacement angle Q smaller than the arrangement angle P, so that the magnetic bodies 30 respectively arranged inside the core portions 23 are displaced. It is positioned in a state displaced in the direction around the axis with respect to the magnetic bodies 30 respectively arranged inside the other core portions 23 that are continuous in the axial direction. Therefore, it is possible to suppress the occurrence of cogging torque and torque ripple when the rotating electric machine 101 is driven by the action of the skew.

Note that the frequency components of the cogging torque and torque ripple that are reduced by the action of the skew are, for example, the dimensions of the protrusion 22, the displacement angle Q between the two continuous core portions 23, 23, the number of core portions 23 constituting the rotor core 20, and the Varies depending on

Further, in the rotary electric machine 101, the lengths of the plurality of protrusions 22, 22 in the regulated portion 21 are made the same. As a result, the lengths in the axial direction of the core portions 23, 23 provided with the protrusions 22, 22 are made the same. Therefore, the estimation of the cogging torque frequency component is facilitated, and for example, the displacement angle Q can be set according to the estimated cogging torque frequency component to suppress the generation of the cogging torque as much as possible.

In addition, in the rotary electric machine 101, the grooves 14 and the projections 22 are each formed in a rectangular shape. This facilitates the manufacture of each of the grooves 14 and the protrusions 22, so that the manufacturing cost of the rotating electric machine 101 can be reduced. Further, the positioning of the rotor core 20 with respect to the shaft 10 can be performed with high accuracy.

Although an example in which the rotor core 20 is configured by the two core portions 23, 23 is shown above, the rotor core 20 may be configured by three or more core portions 23 in the rotary electric machine 101 ( See Figure 12).

For example, the rotor core 20 may be configured by three core portions 23, 23, 23, and the restricted portion 21 may be configured to have three protrusions 22, 22, 22 continuously positioned in the axial direction. be. The protrusion 22 is positioned in a state of being displaced in the axial direction with respect to the other continuous protrusions 22 . The displacement angle Q of one core portion 23 with respect to the other core portion 23 in the two axially continuous core portions 23, 23 is the same for each of the two axially continuous core portions 23, 23. may be different.

In such a configuration, the restricting portion 13 has three groove portions 14, 14, 14 which are positioned continuously in the axial direction. The groove portion 14 is positioned in a state displaced in the axial direction with respect to the other continuous groove portions 14 . The continuous grooves 14, 14 are communicated part by part in the axial direction. The groove portion 14 positioned between the open side groove portion 14X and the closed side groove portion 14Y is defined as an intermediate groove portion 14Z.

In the configuration in which the projections 22 , 22 , 22 of the regulated portion 21 are inserted into the grooves 14 , 14 , 14 of the regulating portion 13 , when the rotor core 20 is inserted into the shaft 10 , the regulated portion 21 is first inserted. The two projections 22, 22 on the tip side in the insertion direction are inserted into the opening-side groove 14X and the intermediate groove 14Z, respectively. When the projections 22 , 22 are inserted into the opening-side groove portion 14X and the intermediate groove portion 14Z, respectively, the second end surface 14b of the intermediate groove portion 14Z on the closed-side groove portion 14Y side comes into contact with the second side surface 22b of the projection 22 . At this time, the second end surface 14b of the opening-side groove portion 14X may also come into contact with the second side surface 22b of the protrusion 22. As shown in FIG.

When the second end surface 14b of the closed groove portion 14Y side of the intermediate groove portion 14Z comes into contact with the second side surface 22b of the protrusion 22, the rotor core 20 is rotated with respect to the shaft 10 in the first direction. When the rotor core 20 is rotated in the first direction with respect to the shaft 10 , the second end surface 14 b of the intermediate groove portion 14 Z on the closing side groove portion 14 Y side separates from the second side surface 22 b of the protrusion 22 . When the second end surface 14b of the intermediate groove portion 14Z on the closed side groove portion 14Y side separates from the second side surface 22b of the protrusion 22, the rotor core 20 is further inserted into the shaft 10, closing the open side groove portion 14X and the intermediate groove portion 14Z. Protrusions 22, 22, 22 are inserted into the side grooves 14Y, respectively. When the projections 22, 22, 22 are inserted into the opening-side groove portion 14X, the intermediate groove portion 14Z, and the closing-side groove portion 14Y, respectively, the second end surface 14b of the closing-side groove portion 14Y opposite to the opening-side groove portion 14X becomes a projection. 22 and axially positions the rotor core 20 with respect to the shaft 10 . At this time, the second end surface 14b of the opening side groove portion 14X and the second end surfaces 14b, 14b of the intermediate groove portion 14Z on the closing side groove portion 14Y side may contact the second side surface 22b of the protrusion 22, respectively.

When projections 22 , 22 , 22 of restricted portion 21 are inserted into grooves 14 , 14 , 14 of restricting portion 13 , rotor core 20 is then further rotated in the first direction relative to shaft 10 . When rotor core 20 is rotated in the first direction with respect to shaft 10 , one first end surface 14 a of opening-side groove 14 X contacts one first side surface 22 a of protrusion 22 . Positioning of the rotor core 20 with respect to the shaft 10 in the axial direction is performed by the contact of the first side surface 22a of the protrusion 22 with the first end surface 14a of the opening-side groove portion 14X. Also, at this time, the second end surfaces 14b, 14b of the closed-side groove portion 14Y come into contact with the second side surfaces 22b, 22b of the protrusion 22, respectively. One first end surface 14a of the closed groove portion 14Y and one first end surface 14a of the intermediate groove portion 14Z may contact the first side surfaces 22a, 22a of the protrusion 22, respectively. Further, the second end surface 14b of the intermediate groove portion 14Z on the side of the opening-side groove portion 14X may be in contact with the second side surface 22b of the protrusion 22 .

When the rotor core 20 is rotated with respect to the shaft 10, the restriction key 40 is inserted into the opening side groove portion 14X. The restriction key 40 inserted into the opening-side groove portion 14X is press-fitted between the other first end surface 14a of the opening-side groove portion 14X and the other first side surface 22a of the projection 22 .

Thus, even when the rotor core 20 is composed of three or more core portions 23 and the restricted portion 21 has three or more protrusions 22, the first end face 14a of the restricting portion 13 and the restricted portion A regulation key 40 press-fitted between the first side surface 22a of the regulation portion 21 regulates displacement of the rotor core 20 with respect to the shaft 10 in the direction around the axis, and at least two second end surfaces 14b of the regulation portion 13, Axial displacement of the rotor core 20 with respect to the shaft 10 is regulated by contacting the second side surfaces 22b, 22b of the regulated portion 21, respectively. Therefore, it is not necessary to attach a member for restricting axial displacement of the rotor core 20 to the outside of the rotor core 20 in the axial direction. Miniaturization can be achieved.

In addition, by changing the number of core portions 23, the displacement angle Q, and the dimensions of the protrusions in this manner, the displacement of the rotor core 20 relative to the shaft 10 in the direction around the shaft 10 and the displacement in the axial direction of the rotating electric machine 101 are controlled. It is possible to reduce the size and realize various skews.

Note that the rotor core 20 may be composed of four or more core portions 23 . Further, in order to improve the output performance of the rotary electric machine 101, two or more core portions 23 each provided with a protrusion 22 may be coupled to a core portion 23 not provided with the protrusion 22. .

Moreover, although the example in which the restricting portion 13 is formed from one end portion to the intermediate portion in the axial direction of the large diameter portion 11 of the shaft 10 has been described above, further miniaturization of the rotor 3 in the axial direction has been described. In order to achieve this, it is possible to shorten the other end of the large-diameter portion 11 where the restricting portion 13 is not formed, or to provide a configuration in which no portion of the large-diameter portion 11 is provided where the restricting portion 13 is not formed. be.

1 housing 2 stator 3 rotor 10 shaft 13 regulating portion 14 groove portion 14a first end face 14b second end face 20 rotor core 21 regulated portion 22 projection 22a first side face 22b second side face 24 electromagnetic steel plate 40 regulation key 100 vehicle 101 rotary electric machine

Claims (5)

A rotating electric machine comprising a stator and a rotor rotated with respect 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 continuously in the axial direction,
The rotor core is formed with a regulated portion having a plurality of protrusions positioned continuously in the axial direction and inserted into the plurality of grooves,
the groove portion is positioned in a state of being displaced in a direction around the axis with respect to the other continuous groove portions;
the protrusion is positioned in a state displaced in the axial direction with respect to the other continuous protrusions;
The groove portion has a pair of first end faces that are end faces in the axial direction and at least one second end face that is end faces in the axial direction,
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,
a regulation key is inserted into the groove while being press-fitted between the first end surface and the first side surface;
At least two of the second end surfaces are in contact with the second side surfaces, respectively. A plurality of the restricting portions are formed on the shaft at equal intervals in the axial direction,
The rotary electric machine according to claim 1, wherein the rotor core is provided with the same number of the regulated portions as the plurality of the regulating portions, the regulated portions being equally spaced apart in the axial direction. The rotor core has a plurality of core portions that are continuous in the axial direction,
The core portion is formed by laminating magnetic steel sheets having convex portions in the axial direction,
The core portion is displaced in the axial direction with respect to the other core portion that is continuous in the axial direction,
The electric rotating machine according to claim 1 or 2, wherein the projection is configured by a plurality of laminated convex portions. Inside the core portion, a plurality of magnetic bodies are arranged at equal intervals at a predetermined angle in the direction around the axis,
The predetermined angle is defined as a first angle,
When the displacement angle of one core portion relative to the other core portion in the axial direction of the two core portions that are continuous in the axial direction is defined as a second angle,
The rotary electric machine according to claim 3, wherein the second angle is smaller than the first angle. A vehicle having a rotating electric machine,
The rotating electric machine includes a stator and a rotor rotated with respect 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 continuously in the axial direction,
The rotor core is formed with a regulated portion having a plurality of protrusions positioned continuously in the axial direction and inserted into the plurality of grooves,
the groove portion is positioned in a state of being displaced in a direction around the axis with respect to the other continuous groove portions;
the protrusion is positioned in a state displaced in the axial direction with respect to the other continuous protrusions;
The groove portion has a pair of first end faces that are end faces in the axial direction and at least one second end face that is end faces in the axial direction,
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,
a regulation key is inserted into the groove while being press-fitted between the first end surface and the first side surface;
At least two of the second end surfaces are in contact with the second side surfaces, respectively. Vehicle.

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