JP2011239614A - Rotor for rotary electric machine - Google Patents

Abstract

There is provided a rotor of a rotating electrical machine in which the number of parts can be reduced to reduce the cost of parts.
A rotor includes a shaft and a core that is fitted and fixed to the outer peripheral surface of the shaft. The shaft 10 protrudes radially outward from the outer peripheral surface of the shaft 10 on both axial sides of the fitting portion 11 to which the core 20 is fitted and fixed, and prevents the core 20 from coming out in the axial direction. A second stopper (bump stopper) 16 is provided. The raised stopper 16 is formed by protruding the meat of the surface portion of the shaft 10 radially outward after the core 20 is fitted into the fitting portion 11 of the shaft 10. The raised stopper 16 prevents the core 20 from coming out in the counter-insertion direction.
[Selection] Figure 1

Description

  The present invention relates to a rotor of a rotating electrical machine mounted on a vehicle, for example.

  For example, Patent Document 1 discloses a rotor of a rotating electrical machine mounted on a vehicle, which includes a shaft and a cylindrical core that is fitted to the outer peripheral surface of the shaft by press-fitting. In such a rotor, in order to prevent relative movement of the shaft and the core in the axial direction, end plates are usually provided on both end surfaces in the axial direction of the core.

Japanese Patent No. 3423485

  However, as described above, the end plates provided on both end surfaces in the axial direction of the core use two members formed by cutting an aluminum material, leading to an increase in component costs.

  This invention is made in view of the said situation, and makes it the subject which should be solved to provide the rotor of the rotary electric machine which reduced the number of parts and was able to reduce parts cost. .

  The invention according to claim 1, which has been made in order to solve the above problem, is a rotor of a rotating electrical machine including a shaft and a core that is fitted and fixed to an outer peripheral surface of the shaft. A first stopper and a second stopper that protrude radially outward from the outer peripheral surface of the shaft and prevent the core from coming out in the axial direction are provided on both axial sides of the fitting portion to which the core is fitted and fixed. Features.

  According to the first aspect of the present invention, the first stopper and the second stopper are formed integrally with the shaft on both sides in the axial direction of the fitting portion of the shaft, so that the core is prevented from coming out on both sides in the axial direction. Therefore, it is not necessary to provide a stopper member formed independently. Therefore, the number of parts can be reduced and the part cost can be greatly reduced.

  In the present invention, either one of the first stopper and the second stopper is formed by cutting the shaft or by processing the surface portion of the shaft to protrude radially outward. In addition, the other of the first stopper and the second stopper is formed by applying a process of raising the meat on the surface portion of the shaft radially outward after the core is inserted into the fitting portion of the shaft. . Any one of the first stopper and the second stopper is preferably formed on the shaft in advance before the core is inserted into the fitting portion of the shaft. If it does in this way, when a shaft and a core are fitted, the stopper can be used as positioning of a core.

  According to a second aspect of the present invention, in any one of the first stopper and the second stopper, after the core is inserted into the fitting portion of the shaft, the thickness of the surface portion of the shaft is set in the radial direction. It is a protruding stopper formed by protruding outward.

  According to the invention described in claim 2, since the bulge stopper is formed by bulging the meat of the surface portion of the shaft radially outward after the core is fitted into the fitting portion of the shaft, A stopper that prevents the core from coming out in the counter-insertion direction can be formed integrally with the shaft. Therefore, conventionally, it is possible to advantageously realize a reduction in the number of parts, considering that the stopper that prevents the core from slipping out in the counter-insertion direction is formed separately from the shaft.

  The invention according to claim 3 is a rotor of a rotating electrical machine including a shaft and a core fitted and fixed to an outer peripheral surface of the shaft, and the shaft is fitted to which the core is fitted and fixed. It is formed by raising the flesh of the surface portion of the shaft radially outward after the core is inserted into the portion, and has a raised stopper that prevents the core from coming out in the counter-insertion direction. To do.

  According to the third aspect of the present invention, the raised stopper for preventing the core from slipping out in the anti-insertion direction is configured such that after the core is inserted into the fitting portion of the shaft, the meat on the surface portion of the shaft is radially outward. The stopper is formed integrally with the shaft so as to prevent the core from coming out in the anti-insertion direction. Therefore, the number of parts can be reduced and the part cost can be greatly reduced. In the present invention, the stopper provided to prevent the core from being pulled out in the insertion direction is preferably formed integrally with the shaft in terms of reducing the number of parts, but is formed separately from the shaft. It may be.

  The invention according to claim 4 is characterized in that the raised stopper protrudes radially outward from the inner peripheral surface of the core.

  According to the invention described in claim 4, since the protruding stopper protrudes radially outward from the inner peripheral surface of the core, it is possible to reliably prevent the core from coming out in the counter-insertion direction.

  The invention according to claim 5 is characterized in that the raised stopper is provided on a part of the outer circumferential surface of the shaft in the circumferential direction.

  According to the fifth aspect of the present invention, it is only necessary to provide a protruding stopper that effectively prevents the core from slipping out in the anti-insertion direction, so that it can be easily formed.

  The invention according to claim 6 is characterized in that the shaft has a concave portion which becomes a space for inserting a jig when the raised stopper is formed on the outer peripheral surface on one axial side of the raised stopper.

  According to the sixth aspect of the present invention, since the bulge stopper can be formed on the shaft using the concave portion provided at a predetermined position on the outer peripheral surface of the shaft, the bulge stopper can be easily formed. it can.

  According to a seventh aspect of the present invention, the shaft has a concave groove extending in the axial direction from the concave portion toward the fitting portion, and the raised stoppers are respectively formed on both sides in the circumferential direction of the concave groove. It is characterized by being.

  According to the seventh aspect of the present invention, when forming the bulge stopper, the load applied to bulge the meat on the surface portion of the shaft radially outward is applied to the portions on the both sides in the circumferential direction of the groove (wall ), The applied load can be reduced. Therefore, it is possible to easily form the raised stopper.

It is sectional drawing which follows the axial direction of the rotor of the rotary electric machine which concerns on embodiment. It is explanatory drawing which shows the assembly | attachment state of the rotor of the rotary electric machine which concerns on embodiment, Comprising: (a) shows the state just before the assembly | attachment of a shaft and a core, (b) shows the state of completion of fitting of a shaft and a core. . It is explanatory drawing which shows the state at the time of forming a raising stopper in embodiment, Comprising: (a) shows the state just before forming a raising stopper, (b) shows the state immediately after forming a raising stopper.

  Hereinafter, an embodiment in which a rotor of a rotating electrical machine according to the present invention is embodied will be specifically described with reference to the drawings.

  FIG. 1 is a cross-sectional view taken along the axial direction of the rotor of the rotating electrical machine according to the first embodiment. A rotor 1 of a rotating electrical machine according to the present embodiment is used, for example, in a rotating electrical machine that also serves as an electric motor and a generator of a vehicle. In the housing of the rotating electrical machine, an inner peripheral side of a stator (not shown). It is accommodated in a rotatable manner. As shown in FIG. 1, the rotor 1 includes a shaft 10 having a first stopper 15 and a second stopper 16, and a cylindrical core 20 fitted and fixed to the outer peripheral surface of the shaft 10. Yes.

  The shaft 10 is formed in a hollow cylindrical shape having a predetermined size from an iron-based metal, and has a fitting portion 11 to which the core 20 is fitted and fixed in the center portion in the axial direction. On the outer peripheral surface of the fitting portion 11, an engagement groove 12 extending in the axial direction for restricting relative displacement in the circumferential direction (rotating direction) with the core 20 fitted to the fitting portion 11 is provided. A first stopper 15 and a second stopper 16 that protrude radially outward from the outer peripheral surface of the shaft 10 and prevent the core 20 from coming off in the axial direction are provided on both sides in the axial direction of the fitting portion 11. The first stopper 15 and the second stopper 16 protrude outward in the radial direction from the inner peripheral surface of the core 20.

  The first stopper 15 is formed in a ring shape by cutting the shaft 10 in advance before inserting the core 20 into the fitting portion 11 of the shaft 10. The first stopper 15 prevents the core 20 from coming out of the shaft 10 in the insertion direction. The second stopper 16 is a raised stopper formed by raising the meat of the surface portion of the shaft 10 radially outward after the core 20 is fitted into the fitting portion 11 of the shaft 10. Hereinafter, the second stopper 16 is also referred to as a raised stopper 16. The two raised stoppers 16 are provided side by side in the circumferential direction in a partial range of the outer circumferential surface of the shaft 10 in the circumferential direction. The raised stopper 16 prevents the core 20 from coming out of the shaft 10 in the counter-insertion direction. The formation of the raised stopper 16 will be described in detail later.

  On the outer peripheral surface on one axial side (right side in FIG. 1) of the bulge stopper 16 of the shaft 10, there is a recess 13 that serves as an insertion space for the jig 18 (see FIG. 3A) when the bulge stopper 16 is formed. Is provided. The concave portion 13 is provided at a position spaced apart from the fitting portion 11 by a predetermined distance, and a raised stopper 16 is formed by raising the surface portion of the shaft 10 between the concave portion 13 and the fitting portion 11. ing. A concave groove 14 extending in the axial direction is provided between the concave portion 13 and the fitting portion 11, and the raised stoppers 16 are formed on both sides in the circumferential direction of the concave groove 14.

  The core 20 is formed in a cylindrical shape by laminating a plurality of annular electromagnetic steel plates having a through hole in the center. A plurality of magnetic poles having different polarities alternately in the circumferential direction are formed on the core 20 by permanent magnets. The core 20 has a fitting hole 21 that penetrates in the axial direction and fits with the fitting portion 11 of the shaft 10. The fitting hole 21 is provided with an engaging protrusion 22 extending in the axial direction for engaging with the engaging groove 12 provided in the fitting portion 11 of the shaft 10.

  The assembly of the core 20 and the shaft 10 is performed as follows. First, as shown in FIG. 2A, with respect to the shaft 10 on which the raised stopper 16 is not formed, the end opposite to the first stopper 15 is fitted into the fitting hole 21 of the core 20, The core 20 is pushed in to the position where the core 20 and the first stopper 15 come into contact (FIG. 2B).

  3A, the jig 18 is inserted into the concave portion 13 of the shaft 10, and the tip of the jig 18 is applied to the meat 16a on the surface portion of the shaft 10 on both sides of the concave groove 14 in the circumferential direction. Make contact. In this state, a load is applied to the meat 16a on the surface portion of the shaft 10 in the axial direction by the jig 18, and the meat 16a on the surface portion of the shaft 10 is raised outward in the radial direction. As a result, as shown in FIG. 3B, the raised stoppers 16 are formed on both sides in the circumferential direction of the groove 14. Note that the load applied in the axial direction by the jig 18 can be small because it can be distributed to the two portions (the meat 16a) on both sides in the circumferential direction by providing the concave grooves 14.

  According to the rotor 1 of the present embodiment configured as described above, the first stopper 15 and the raised stopper 16 provided on both axial sides of the fitting portion 11 of the shaft 10 are formed integrally with the shaft 10. Therefore, it is not necessary to provide a stopper member that is independently formed in order to prevent the core 20 from coming out to both sides in the axial direction. Therefore, the number of parts can be reduced and the part cost can be greatly reduced.

  In particular, the protrusion stopper 16 is formed by protruding the meat 16a on the surface portion of the shaft 10 radially outward after the core 20 is inserted into the fitting portion 11 of the shaft 10, so that the core 20 A stopper that prevents the slipping in the counter-insertion direction can be formed integrally with the shaft 10. For this reason, conventionally, considering that the stopper that prevents the core 20 from coming out in the counter-insertion direction is formed separately from the shaft 10, it is possible to advantageously reduce the number of parts.

  Since the raised stopper 16 is formed so as to protrude outward in the radial direction from the inner peripheral surface of the core 20, it is possible to reliably prevent the core 20 from coming out in the counter-insertion direction. Further, since the raised stopper 16 is provided in a part of the outer peripheral surface of the shaft 10 in the circumferential direction, it can be easily formed because it is only required to be provided in the minimum necessary range.

  Further, in the present embodiment, since the concave portion 13 that is an insertion space for the jig 18 when the raised stopper 16 is formed is provided on the outer peripheral surface on one axial side of the raised stopper 16 of the shaft 10, the concave portion 13 can be used to easily form the raised stopper 16.

  Furthermore, since the shaft 10 has a concave groove 14 extending in the axial direction from the concave portion 13 toward the fitting portion 11 and the raised stoppers 16 are formed on both sides in the circumferential direction of the concave groove 14, respectively. When forming 16, the load applied in order to make the meat | flour 16a of the surface part of the shaft 10 protrude radially outward can be made small. This makes it possible to easily form the raised stopper 16.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the first stopper 15 is formed by cutting the shaft 10. However, like the raised stopper 16, the meat on the surface portion of the shaft 10 is radially outward. The first stopper 15 may be formed integrally with the shaft 10 by being raised. Further, in the above embodiment, since the second stopper 16 is a raised stopper, the number of parts can be reduced (the invention of claim 3), so the first stopper 15 is separated from the shaft 10. It is also possible to change to the formed stopper member.

  Moreover, in the said embodiment, although the two protrusion stoppers 16 are provided in the state arranged in the circumferential direction, the number of the protrusion stoppers 16 may be one, or may be three or more.

  DESCRIPTION OF SYMBOLS 1 ... Rotor, 10 ... Shaft, 11 ... Fitting part, 12 ... Engagement groove, 13 ... Recessed groove, 14 ... Recessed groove, 15 ... First stopper, 16 ... Second stopper (raised stopper), 18 ... Jig 20 ... Core, 21 ... Fitting hole, 22 ... Engagement ridge.

Claims (7)

In a rotor of a rotating electrical machine comprising a shaft and a core fitted and fixed to the outer peripheral surface of the shaft,
The shaft protrudes radially outward from the outer peripheral surface of the shaft on both axial sides of the fitting portion to which the core is fitted and fixed, and prevents the core from coming out in the axial direction. A rotor of a rotating electrical machine having a stopper.   One of the first stopper and the second stopper is formed by protruding the meat of the surface portion of the shaft radially outward after the core is inserted into the fitting portion of the shaft. The rotor of the rotating electrical machine according to claim 1, wherein the rotor is a raised stopper. In a rotor of a rotating electrical machine comprising a shaft and a core fitted and fixed to the outer peripheral surface of the shaft,
The shaft is formed by protruding the meat of the surface portion of the shaft radially outward after the core is inserted into the fitting portion to which the core is fitted and fixed, and the core is inserted in the opposite direction. A rotor of a rotating electrical machine having a bulge stopper that prevents slipping out.   4. The rotor of a rotating electrical machine according to claim 2, wherein the raised stopper protrudes radially outward from the inner peripheral surface of the core. 5.   The rotor of a rotating electrical machine according to any one of claims 2 to 4, wherein the raised stopper is provided in a part of the outer peripheral surface of the shaft in the circumferential direction.   The said shaft has a recessed part used as the insertion space of a jig | tool at the time of forming the said protrusion stopper in the outer peripheral surface of the axial direction one side of the said protrusion stopper. The rotor of the rotary electric machine as described in 2.   The rotation of the rotating electrical machine according to claim 6, wherein the shaft has a groove extending in the axial direction from the recess, and the raised stoppers are formed on both sides in the circumferential direction of the groove. Child.

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