JP2018121441A - Assembly structure of end plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain increase in the resistance from surrounding fluid resulting from a rotation regulation part, during rotation of the rotor for dynamo-electric machine.SOLUTION: Movement of an end plate 21 is regulated in the axial direction for the rotor shaft 11, and the end plate 21 is assembled to the rotor shaft 11 with rotation thereof being regulated for the rotor shaft 11 by a rotation regulation part A. The rotation regulation part A includes a locked part (a recess 15), a groove 31 and a locking part 33. The recess 15 is provided in the periphery of the rotor shaft 11, and the groove 31 extends in the hoop direction at the intermediate part of the end plate 21 in the radial direction. The locking part 33 regulates rotation of the end plate 21 for the rotor shaft 11, by projecting in the radial direction from a part facing the recess 15 in the radial direction, out of the farther inner part than the groove 31 in the radial direction of the end plate 21, and locking to the recess 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an end plate assembly structure in which an end plate is assembled to a rotor shaft in a rotor for a rotating electrical machine.

  The rotor for a rotating electrical machine is configured by providing an outer peripheral portion of a rotor shaft with a rotor core extending in the axial direction and an annular end plate adjacent to at least one side in the axial direction of the rotor core.

  In order to assemble the end plate to the rotor shaft, for example, in Patent Document 1, the convex portion formed on the rotor shaft is engaged with the concave portion formed on the end plate by caulking. Therefore, the end plate can be assembled to the rotor shaft in a state where the rotation of the end plate with respect to the rotor shaft is restricted by the rotation restricting portion including the concave portion and the convex portion.

JP 2014-72903 A

  However, in a state where the convex portion is engaged with the concave portion, a part of the convex portion protrudes axially outward from the outer peripheral surface of the rotor shaft (the inner peripheral surface of the end plate). The protruding portion of the convex portion increases the resistance received from the surrounding fluid, for example, air, oil, water, etc. when the rotating electrical machine rotor rotates, and may hinder the rotation of the rotating electrical machine rotor.

  The present invention has been made in view of such a situation, and an object thereof is to suppress an increase in resistance received from a surrounding fluid during rotation of a rotor for a rotating electrical machine due to a rotation restricting portion. It is to provide an assembly structure of an end plate that can be used.

  An assembly structure of an end plate that solves the above-mentioned problem is a rotating electrical machine in which a rotor core extending in the axial direction and an annular end plate adjacent to at least one side in the axial direction of the rotor core are provided on the outer periphery of the rotor shaft The end plate is assembled to the rotor shaft, and the end plate is restricted from moving in the axial direction with respect to the rotor shaft, and is rotated with respect to the rotor shaft by a rotation restricting portion. The rotation restricting portion extends in the circumferential direction at a locked portion provided on the outer peripheral portion of the rotor shaft and an intermediate portion in the radial direction of the end plate. Among the provided groove and the inner portion of the end plate in the radial direction than the groove in the radial direction. A locking portion for restricting rotation of the end plate relative to the rotor shaft by protruding in the same radial direction from a portion facing the portion in the radial direction and being locked to the locked portion. .

  According to the above configuration, the end plate is restricted from moving in the axial direction with respect to the rotor shaft, and is restricted from rotating with respect to the rotor shaft by the rotation restricting portion. Therefore, the end plate rotates integrally with the rotor shaft as the rotating electrical machine rotor rotates. At this time, the rotation restricting portion also rotates together with the rotor shaft and the end plate. The rotation restricting portion includes a locked portion of the rotor shaft, a groove and a locking portion of the end plate, both of which are inward of the outer peripheral surface in the radial direction of the end plate, and the end plate It is located between both end surfaces in the axial direction. Therefore, the influence of the rotation restricting portion on the resistance received from the surrounding fluid during rotation of the rotor for a rotating electrical machine is small.

  According to the assembly structure of the end plate, it is possible to suppress an increase in the resistance received from the surrounding fluid when the rotor for the rotating electrical machine rotates due to the rotation restricting portion.

The perspective view of the rotor shaft and end plate in one Embodiment. (A) is the longitudinal cross-sectional view which shows the rotor shaft and end plate in one Embodiment in the state which a part was abbreviate | omitted, (b) shows the internal structure of the rotor for rotary electric machines in a state a part was abbreviate | omitted. The longitudinal cross-sectional view and (c) are the partial longitudinal cross-sectional views which expand and show a part of FIG.2 (b). (A) is a side view of the end plate in one embodiment, (b) is a side view of the rotor shaft in the same embodiment. It is a figure which shows the rotor for rotary electric machines in one Embodiment, (a) is a side view which shows the state before a latching | locking part is formed, (b) is a side view which shows the state in which the latching | locking part was formed. . (A), (b) is the side view of the rotor for rotary electric machines with which the end plate was assembled | attached to the rotor shaft by the rotation angle different from FIG.4 (b) in one Embodiment. The side view of the rotor for rotary electric machines with which the end plate of the modification from which the number of grooves differs was assembled | attached to the rotor shaft. (A) is a longitudinal cross-sectional view which shows the internal structure of the rotor for rotary electric machines of a modification, (b) is a partial longitudinal cross-sectional view which expands and shows a part of FIG. 7 (a).

Hereinafter, an embodiment of an end plate assembly structure will be described with reference to FIGS.
As a rotating electrical machine suitable for high rotation, such as motors, electric compressors, and generators used in electric superchargers for automobiles, a rotor for the rotating electrical machine is rotatably provided on the inner peripheral side of the stator provided with field windings. There is a so-called inner rotor type rotating electrical machine.

  FIG. 2B shows the internal structure of the rotor 10 for a rotating electrical machine with a part thereof omitted. As shown in FIG. 2B, the rotating electrical machine rotor 10 includes a rotor shaft 11, a rotor core 18, a pair of end plates 21, and a reinforcing ring 41.

  As shown in FIGS. 1 and 2A, the rotor shaft 11 includes a large-diameter shaft portion 12 and a pair of small-diameter shaft portions 13 in a part in the axial direction. The large-diameter shaft portion 12 is located at a location deviated from the central portion in the axial direction of the rotor shaft 11 toward one end (right side in FIGS. 1 and 2A) of the rotor shaft 11. . Both small diameter shaft portions 13 are adjacent to both sides of the large diameter shaft portion 12 in the axial direction. One small diameter shaft portion 13 constitutes one end portion of the rotor shaft 11. A male screw portion 14 is formed on the outer peripheral portion of each small diameter shaft portion 13.

  As shown in FIG. 2B, the rotor core 18 is formed of a cylindrical magnet that extends in the axial direction and is open at both ends. The axial length of the rotor core 18 is set slightly shorter than the length of the large-diameter shaft portion 12 in the same direction. The rotor core 18 is fitted into the outer periphery of the large-diameter shaft portion 12 with a gap.

  As shown in FIGS. 1 and 2A, each end plate 21 has an annular shape with both ends in the axial direction being open. Each end plate 21 has a large-diameter hole 22 and a small-diameter hole 23 that are adjacent to each other in the axial direction. The large-diameter hole portion 22 for each end plate 21 is opened on the end surface 21 a near the large-diameter shaft portion 12, and the small-diameter hole portion 23 is opened on the end surface 21 b far from the large-diameter shaft portion 12. The inner diameter of each large-diameter hole portion 22 is set to a size that allows the large-diameter shaft portion 12 to be fitted to the end portion in the axial direction. A female screw portion 26 that can be screwed into the male screw portion 14 of the small diameter shaft portion 13 is formed on the inner peripheral portion of each small diameter hole portion 23. A flange 27 having a diameter larger than that of other portions of the end plate 21 is formed on the outer periphery of the end portion on the side far from the large diameter shaft portion 12 in the axial direction of each end plate 21.

  As shown in FIG. 2B, each end plate 21 is screwed into the male screw portion 14 at the female screw portion 26. By this screwing, the stepped portion 28 between the large diameter hole portion 22 and the small diameter hole portion 23 contacts or approaches the stepped portion 16 between the large diameter shaft portion 12 and the small diameter shaft portion 13 in the rotor shaft 11. ing. Further, end surfaces 21 a of the end plates 21 are in pressure contact with both end surfaces in the axial direction of the rotor core 18.

  The reinforcing ring 41 is formed in a cylindrical shape whose both ends in the axial direction are opened by a material that is stronger and lighter than the rotor core 18. The reinforcing ring 41 is assembled by outer fitting or winding at a location sandwiched by both flanges 27 on the outer peripheral surfaces of both end plates 21 and the rotor core 18. The reinforcing ring 41 plays a role of restricting the rotor core 18 from being deformed radially outward by centrifugal force when the rotating electrical machine rotor 10 is rotated at a high speed.

  As shown in FIGS. 2C and 4B, the rotating electrical machine rotor 10 is provided with a pair of rotation restricting portions A that restrict the rotation of the end plates 21 with respect to the rotor shaft 11. Each rotation restricting portion A includes a plurality of locked portions provided on the outer peripheral portion of the rotor shaft 11 and a plurality of grooves 31 provided on each end plate 21. 2 (c) and 3 (b), the locked portion extends in the axial direction, and the outer diameter surface 13a of the small diameter shaft portion 13 and the large diameter shaft portion of the small diameter shaft portion 13 are included. 12 is constituted by a pair of recesses 15 opened across the surface 13b on the opposite side. Both concave portions 15 are provided at equal angles (180 °) in the circumferential direction of the small-diameter shaft portion 13.

  As shown in FIG. 2B, FIG. 3A, and FIG. 4A, each groove 31 has three different numbers in the intermediate portion in the radial direction of each end plate 21 from the concave portion 15. It is provided one by one. Each groove 31 has an arc shape extending in the circumferential direction so as to form a part of the same circle centered on the rotor shaft 11 in each end plate 21. Each groove 31 is provided at equal angles (120 °) in the circumferential direction. The length and groove width in the circumferential direction of each groove 31 are set to be the same between the grooves 31.

  As described above, the number of recesses 15 and the number of grooves 31 in each rotation restricting portion A are made different. In other words, the (minimum) divisor of the number of recesses 15 and the (minimum) divisor of the number of grooves 31 are set to have a different relationship. This is one of the conditions necessary for making at least one groove 31 face one of the recesses 15 in the radial direction regardless of the rotation angle of each end plate 21 with respect to the rotor shaft 11. Furthermore, in this embodiment, the length in the circumferential direction of each groove 31 and the length in the same direction of the portion between the adjacent grooves 31 (hereinafter referred to as “inter-groove portion 32”) are the above-described recess 15 and groove. By combining with the setting of the number of 31, the value satisfying the above condition is set.

  Each groove 31 is open to an end surface 21b of each end plate 21 opposite to the rotor core 18 in the axial direction. When each end plate 21 is screwed into the small-diameter shaft portion 13, a rotary tool 35 for rotating the end plate 21 is used. As shown by a two-dot chain line in FIG. 3A, the rotary tool 35 includes three engagement convex portions 36 that are the same number as the grooves 31 in each end plate 21. These engagement convex portions 36 have shapes and sizes that can be simultaneously engaged (fitted) with all the grooves 31 in each end plate 21. That is, the three engaging convex portions 36 have an arc shape extending in the circumferential direction so as to constitute a part of the same circle with the rotor shaft 11 as the center.

  As shown in FIG. 2C and FIG. 4B, each rotation restricting portion A includes one locking portion 33 in addition to the concave portion 15 and the groove 31. The locking portion 33 is formed in a portion of the end plate 21 that is radially opposite to any one of the recesses 15 in the inner portion of the groove 31 in the radial direction. The engaging portion 33 is for restricting the rotation of each end plate 21 relative to the rotor shaft 11 by being engaged with the concave portion 15, and the above-mentioned portion for each end plate 21 is arranged inwardly in the radial direction. It is formed by pressing and crimping (deforming). The locking portion 33 for each end plate 21 protrudes inward in the radial direction from the inner peripheral portion of the end plate 21 and enters the corresponding recess 15.

Next, the operation and effect of the present embodiment configured as described above will be described.
First, an operation for assembling both end plates 21 to the rotor shaft 11 will be described. This assembly is performed on the rotor shaft 11 in which the rotor core 18 is externally fitted to the large-diameter shaft portion 12, and the reinforcing ring 41 is externally fitted or wound around the rotor core 18.

  As shown in FIGS. 2A and 2B, the pair of end plates 21 are screwed to the outer peripheral portion of each small-diameter shaft portion 13 of the rotor shaft 11 from both sides in the axial direction of the rotor core 18 and the reinforcing ring 41. . That is, each end plate 21 is screwed to the male screw portion 14 of the small diameter shaft portion 13 at the female screw portion 26 on the inner peripheral portion thereof. By this screwing, the large-diameter hole portion 22 for each end plate 21 is externally fitted to the end portion in the axial direction of the large-diameter shaft portion 12.

  The rotation of each end plate 21 for screwing is performed using the rotary tool 35 indicated by the two-dot chain line in FIG. That is, the rotary tool 35 is moved closer to the three grooves 31 opened on the end surface 21b opposite to the rotor core 18 in the axial direction of each end plate 21 from the axial direction. The engaging projections 36 of the rotary tool 35 are engaged with the corresponding grooves 31. At this time, each groove 31 functions as an engagement recess to which the engagement projection 36 of the rotary tool 35 is engaged. When the rotary tool 35 is rotated in the direction in which each end plate 21 is tightened in a state where all the engagement convex portions 36 are engaged with all the grooves 31, the rotation is transmitted through the engagement convex portions 36 and the grooves 31. Are transmitted to each end plate 21. Each end plate 21 rotates integrally with the rotary tool 35 and is screwed to the corresponding small diameter shaft portion 13 of the rotor shaft 11. Therefore, it is not necessary to provide an uneven portion for locking the rotary tool 35 on the outer peripheral surface 21c such as the flange 27 of each end plate 21.

  Further, when the end plates 21 are screwed together as described above, at least one groove 31 faces any one of the recesses 15 in the radial direction of the end plate 21 regardless of the rotation angle of the end plate 21. (See FIGS. 4A, 5A, and 5B). In FIG. 4A, the upper groove 31 faces the upper concave portion 15 at the circumferential central portion, and the lower groove portion 32 faces the lower concave portion 15. In FIG. 5A, the two grooves 31 face the recess 15 at one end in the circumferential direction. In FIG. 5 (b), contrary to FIG. 4 (a), the lower groove 31 faces the lower recess 15 at the center in the circumferential direction, and the upper groove portion 32 is on the upper side. Opposite the recess 15.

  Here, if the number of recesses 15 and the number of grooves 31 are the same, the number of inter-groove parts 32 is also the same as the number of recesses 15. The plurality of inter-groove portions 32 exist at equal angles in the circumferential direction for each end plate 21. Depending on the rotation angle of the end plate 21, none of the grooves 31 may face the recess 15. However, when the number of grooves 31 is different from the number of recesses 15 as in this embodiment, in other words, the (minimum) divisor of the number of recesses 15 and the (minimum) divisor of the number of grooves 31 are different. In this case, the circumferential lengths of the grooves 31 and the inter-groove portions 32 are set to appropriate values. In this way, regardless of the rotation angle of the end plate 21, not all the inter-groove portions 32 are opposed to all the concave portions 15 in the radial direction, that is, at least one groove 31 is formed in any one of the concave portions 15. It is possible to oppose.

  Then, as shown in FIGS. 2A and 2B, each end plate 21 is fastened to the outer peripheral portion of the corresponding small diameter shaft portion 13 by the screwing. This tightening is performed while measuring the tightening torque. When the tightening torque reaches an appropriate value, the rotation of each end plate 21 is stopped.

  By the above tightening, each end plate 21 is assembled to the rotor shaft 11 in a state where movement in the axial direction is restricted. Further, the rotor core 18 is sandwiched in a state where pressure is applied by both end plates 21 from both sides in the axial direction.

Even in a state where each end plate 21 is fastened to the rotor shaft 11, at least one groove 31 is opposed to any one of the recesses 15 in the radial direction as described above.
Here, the recessed part 15 opened over the outer peripheral surface 13a and the surface 13b of each small diameter shaft part 13 in the rotor shaft 11 functions as a locked part. In addition, each groove 31 in each end plate 21 exhibits a function of forming a part that is more easily deformed than the other part of the end plate 21 in a part of the end plate 21 in the circumferential direction. The corresponding part is an inner part of the end plate 21 than the groove 31 in the radial direction. Of this portion, the portion facing the concave portion 15 in the radial direction is pressed and caulked inward in the same direction as shown in FIG. By this caulking, the portion of the end plate 21 is deformed so as to protrude inward in the radial direction and enter the recess 15. Due to the above deformation, the locking portion 33 locked to the recess 15 is formed. The locking portion 33 and the recess 15 cooperate to restrict the rotation of each end plate 21 relative to the rotor shaft 11.

  The tightening torque becomes an appropriate value, and the rotation of each end plate 21 is stopped at a rotation angle different from that shown in FIG. 4A, for example, the rotation angle shown in FIGS. 5A and 5B. Even in this case, as described above, at least one groove 31 faces one of the recesses 15. Therefore, regardless of the rotation angle of each end plate 21, a locking portion 33 is formed by deforming an inner portion of the end plate 21 in the radial direction of the end plate 21 to form a rotor shaft of each end plate 21. 11 can be restricted from rotating.

  Thus, in the present embodiment, the rotation of each end plate 21 relative to the rotor shaft 11 can be regulated by caulking while the axial movement of each end plate 21 relative to the rotor shaft 11 is regulated by screwing. it can. Each end plate 21 can be firmly assembled to the rotor shaft 11.

The rotor core 18 sandwiched between the both end plates 21 from both sides in the axial direction is also restricted from moving and rotating in the axial direction.
Furthermore, the operation | work which manages the rotation angle of each end plate 21 becomes unnecessary so that the at least 1 groove | channel 31 may oppose any recessed part 15 to radial direction. It is not necessary to manage the tightening torque and the rotation angle at the same time. It is only necessary to manage the tightening torque, and the work of assembling each end plate 21 to the rotor shaft 11 becomes easy, and the assembling workability is improved.

  By the way, when the rotating electrical machine rotor 10 is rotated in accordance with the operation of the rotating electrical machine, both the end plates 21, the rotor core 18, and the reinforcing ring 41 rotate integrally with the rotor shaft 11. At this time, the rotation restricting portion A that restricts the rotation of each end plate 21 relative to the rotor shaft 11 also rotates together with the rotor shaft 11 and the like. Each rotation restricting portion A includes a concave portion 15 of the rotor shaft 11, a groove 31 of the end plate 21, and a locking portion 33, all of which are inward of the outer peripheral surface 21 c in the radial direction of the end plate 21. In addition, the end plate 21 is positioned between both end faces 21a and 21b in the axial direction. Therefore, Patent Document 1 in which a part of the convex part protrudes outward in the axial direction from the outer peripheral surface of the rotor shaft (the inner peripheral surface of the end plate) with the convex part engaged with the concave part by caulking. In comparison, the rotation restricting portion A has little influence on the resistance received from the surrounding fluid, for example, air, oil, water, or the like when the rotor 10 for rotating electrical machines rotates. As a result, it is possible to suppress an increase in the resistance received from the surrounding fluid during the rotation of the rotor 10 for the rotating electrical machine due to the rotation restricting portion A.

  Further, if an uneven portion for locking the rotary tool 35 is provided on the outer peripheral surface 21c such as the flange 27 of each end plate 21, the same rotation as described above is caused by the uneven portion. The problem of increased resistance over time can occur. However, in the present embodiment, as described above, each groove 31 functions as an engagement concave portion with which the engagement convex portion 36 of the rotary tool 35 is engaged. Absent. Therefore, it is possible to suppress an increase in resistance received from the surrounding fluid during rotation of the rotor 10 for a rotating electrical machine due to the uneven portion.

According to the present embodiment, the following effects can be obtained in addition to the above-described matters.
A combination of the number of recesses 15 and the number of grooves 31 (the number of which is different) satisfying the condition that at least one groove 31 is opposed to any one of the recesses 15 regardless of the rotation angle of the end plate 21. There are various possibilities. The combination of the numbers of the present embodiment in which the number of recesses 15 is “2” and the number of grooves 31 is “3” is the smallest combination among the possible combinations. For this reason, it is possible to reduce the machining cost when machining the recess 15 in the rotor shaft 11 and machining the groove 31 in each end plate 21, thereby reducing the machining cost.

  Since the pair of concave portions 15 are provided at equal angles in the circumferential direction of the outer peripheral portion of the small-diameter shaft portion 13 of the rotor shaft 11, the rotation of the rotor shaft 11 is unbalanced due to the concave portions 15. Can be suppressed.

  Further, since the three grooves 31 are provided at equal angles in the circumferential direction of each end plate 21, it is possible to suppress the rotation of the end plate 21 from being unbalanced due to the grooves 31. .

  -It is generally known that separate parts such as a split pin, a lock nut (double nut), a spun ring, a chrysanthemum washer (lock washer), etc. are used to prevent the screws from loosening. In the present embodiment, the locking portion 33 is formed by deforming a part of the inner peripheral portion of each end plate 21 that functions as a screw, thereby restricting the rotation of the end plate 21 relative to the rotor shaft 11. Thus, it is not necessary to use a separate part for preventing loosening as described above. Therefore, each end plate 21 can be prevented from rotating with a simple structure without adding another component to the rotor 10 for the rotating electrical machine.

In addition, the said embodiment can also be implemented as a modification which changed this as follows.
The end plate 21 may be disposed only on one side in the axial direction of the rotor core 18. In this case, for example, on the outer peripheral portion of the rotor shaft 11 on the side opposite to the end plate 21 of the rotor core 18, a receiving portion that restricts the rotor core 18 from moving to the side away from the end plate 21 in the axial direction. Provided. Then, one end plate 21 is tightened by screwing, whereby the rotor core 18 is pressed against the receiving portion. Even in such a case, the rotor core 18 can be sandwiched from both sides in the axial direction by the end plate and the receiving portion, and the axial movement and rotation of the rotor core 18 relative to the rotor shaft 11 can be restricted. Moreover, although the rotation control part A becomes one, the effect | action and effect similar to the said embodiment can be acquired.

  The combination of the number of locked portions (recesses 15) in the rotor shaft 11 and the number of grooves 31 in the end plate 21 may be changed to a different one from the above embodiment. However, the number of the locked portions (recesses 15) and the number of the grooves 31 are both plural and different from each other. In other words, the (minimum) divisor of the number of the locked portions (recesses 15) and the grooves The 31 (minimum) divisor needs to have a different relationship.

FIG. 6 shows a modification in which a pair of locked portions (recesses 15) are provided and five grooves 31 are provided.
Also in this case, at least one groove 31 can be obtained regardless of the rotation angle of each end plate 21 with respect to the rotor shaft 11 by setting the length of each groove 31 and each groove portion 32 in the circumferential direction to an appropriate value. Can be opposed to any one of the recesses 15 in the radial direction. In the case of FIG. 6, the lower groove 31 faces the lower concave portion 15 at the center portion in the circumferential direction, and the upper groove portion 32 faces the upper concave portion 15. Therefore, the latching | locking part 33 can be formed by deform | transforming an inner part rather than the groove | channel 31 of the lower side in the radial direction of the end plate 21 to the inward of the same direction.

  -As a to-be-latched part, it replaces with the said recessed part 15, and the convex part which protrudes to radial direction outward from the small diameter shaft part 13 of the rotor shaft 11 may be provided. In this case, the shape of the locking portion in each end plate 21 is changed to a shape different from the above embodiment. In the engaging portion, the portion of the end plate 21 that is radially inward of the groove 31 in the radial direction is opposed to the convex portion in the radial direction, and protrudes outward in the same radial direction so that the end plate with respect to the rotor shaft 11 It is formed in a shape that restricts the rotation of 21. The corresponding shape of the locking portion is a shape in which the convex portion is sandwiched from both sides in the circumferential direction in the groove 31. By forming the locking portion in such a shape, the locking portion can be locked to the convex portion.

-The recessed part 15 may not be opened in the surface 13b of the small diameter shaft part 13, and may open only in the outer peripheral surface 13a.
A plurality of locking portions 33 in the end plate 21 may be formed. For example, as shown in FIG. 5A, when the two grooves 31 face the two recesses 15 in the radial direction, each groove 31 protrudes inward in the radial direction to the recess 15. Two engaging portions 33 may be formed. In FIG. 5A, only one locking portion 33 is formed, but the end portion in the circumferential direction of the lower groove 31 further protrudes inward in the radial direction to form the lower concave portion 15. By being deformed so as to enter, the locking portion 33 may be additionally formed.

  The groove 31 in each end plate 21 is formed in an annular shape so as to surround the rotor shaft 11 instead of an arc shape when the function as the engagement recess of the engagement protrusion 36 in the rotary tool 35 is not required. May be. Even in this case, the locking portion 33 is formed in a portion facing the locked portion (recessed portion 15) in the radial direction in the inner portion of the groove 31 in the radial direction of each end plate 21. Is possible.

  The end plate 21 may be assembled to the rotor shaft 11 in a state in which movement in the axial direction is restricted, in a form different from screwing. FIGS. 7A and 7B show a modification in which the rotor shaft 11 is press-fitted into each end plate 21.

  In this case, as the rotation restricting portion A that restricts the rotation of each end plate 21 with respect to the rotor shaft 11, the locked portion (recessed portion 15) on the outer peripheral portion of the rotor shaft 11 and each end plate 21, as in the above embodiment. The thing provided with the groove | channel 31 and the latching | locking part 33 of this is employ | adopted.

  In this manner, the axial movement of each end plate 21 can be regulated by press-fitting, and the rotation of the end plate 21 with respect to the rotor shaft 11 can be regulated. By being locked by the recess 15), it is possible to reinforce the regulation of rotation.

  Also in this modified example, the locked portion (recess 15), the groove 31, and the locking portion 33 are all inward of the outer peripheral surface 21c in the radial direction of each end plate 21, and the same end. The plate 21 is located between both end faces 21a and 21b in the axial direction. Therefore, it is possible to suppress an increase in the resistance received from the surrounding fluid during rotation of the rotor 10 for the rotating electrical machine due to the rotation restricting portion A.

  DESCRIPTION OF SYMBOLS 10 ... Rotor for rotary electric machines, 11 ... Rotor shaft, 13a, 21c ... Outer peripheral surface, 15 ... Recessed part (locked part), 18 ... Rotor core, 21 ... End plate, 31 ... Groove, 33 ... Locking part, A ... Rotation restriction part.

Claims (5)

A rotor core extending in the axial direction and an annular end plate adjacent to at least one side in the axial direction of the rotor core are applied to a rotor for a rotating electrical machine, and the end plate is applied to the rotor shaft. It is a structure assembled to
The end plate is assembled in a state where movement in the axial direction with respect to the rotor shaft is restricted, and rotation with respect to the rotor shaft is restricted by a rotation restricting portion,
The rotation restricting portion is
A locked portion provided on an outer peripheral portion of the rotor shaft;
A groove provided to extend in the circumferential direction at a middle portion in the radial direction of the end plate;
Of the end portion of the end plate that is inward of the groove in the radial direction, the end plate protrudes in the same radial direction from the portion that faces the locked portion in the radial direction and is locked to the locked portion. A structure for assembling the end plate, comprising: a locking portion for restricting rotation of the end plate with respect to the rotor shaft.   The assembly of the end plate according to claim 1, wherein the end plate is assembled in a state in which movement in the axial direction is restricted with respect to the rotor shaft by being tightened to the rotor shaft by screwing. Construction.   The end plate assembly according to claim 1, wherein the end plate is assembled in a state in which movement in the axial direction is restricted with respect to the rotor shaft by press-fitting the rotor shaft into the end plate. Construction. The locked portion is provided at a plurality of equiangular positions in the circumferential direction of the rotor shaft,
The groove is provided for each equiangular number at a plurality of positions different from the circumferentially engaged portion of the end plate, and at least one of the grooves is provided in the radial direction with respect to any of the locked portions. Facing each other
The said latching | locking part is formed in the inner part in the said radial direction of the said end plate rather than the thing facing the said radial direction with respect to the said to-be-latched part among several said grooves. The assembly structure of the end plate according to any one of the above. The locked portion is configured by a recess opening at least on the outer peripheral surface of the rotor shaft,
The end plate assembly structure according to any one of claims 1 to 4, wherein the locking portion protrudes inward in the radial direction from the end plate and enters the recess.

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