JP6013989B2 - Rotating electric machine and assembling method thereof - Google Patents

Description

  The present invention relates to a rotating electrical machine and an assembling method thereof.

  2. Description of the Related Art Conventionally, a rotating electric machine including a cylindrical motor yoke that rotatably accommodates an armature and a resin end housing that is provided alongside the motor yoke in the axial direction of the armature and closes the opening of the motor yoke is known. It has been. In this rotating electric machine, a caulking piece is formed on a motor yoke, and the end housing is fixed to the motor yoke by caulking the caulking piece to the end housing (see, for example, Patent Document 1).

Japanese Patent No. 4234526

  By the way, among the rotating electrical machines including the motor yoke and the end housing as described above, there is one in which a metal plate is attached to the end housing. In such a rotating electrical machine, it is desired that the metal plate can be easily fixed to the motor yoke.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electrical machine that can easily fix a metal plate to a motor yoke and an assembling method thereof.

  In order to achieve the above object, the rotating electrical machine according to claim 1 is provided with a cylindrical motor yoke that rotatably accommodates an armature, and along with the motor yoke in an axial direction of the armature, A resin end housing that closes the opening of the motor yoke, a metal plate attached to the end housing, and formed on the motor yoke and caulked to the end housing through a part of the metal plate, and the end housing And a caulking piece for fixing the metal plate to the motor yoke.

  According to this rotating electric machine, the caulking piece formed on the motor yoke is caulked to the end housing via a part of the metal plate, and thereby the end housing and the metal plate are fixed to the motor yoke. . Accordingly, since the structure for fixing the end housing and the motor yoke is also used for the structure for fixing the metal plate to the motor yoke, the metal plate can be easily fixed to the motor yoke.

  According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, a corner portion is formed in the end housing, and a contact piece as a part of the metal plate is formed in the metal plate. The caulking pieces are caulked to the corners via the contact pieces in a state where the contact pieces are in surface contact with the corners.

  According to this rotating electrical machine, the caulking piece is caulked to the corner portion via the contact piece in a state where the contact piece is in surface contact with the corner portion. Therefore, since it is possible to suppress the caulking pieces from making point contact or line contact with the corners, it is possible to suppress the local concentration of stress on the corners (in other words, the corners The surface pressure received by the Thereby, damage, such as a crack of a corner corner, can be controlled.

  The rotating electrical machine according to claim 3 is the rotating electrical machine according to claim 2, wherein the end housing is located on a side opposite to the motor yoke side with respect to the corner portion in the axial direction of the armature. A mounting surface facing the side opposite to the motor yoke side in the axial direction of the armature is formed, and the metal plate is mounted on the mounting surface, and the motor yoke side from the mounting portion An extension piece having the contact piece formed at the tip thereof, and the placement portion is squeezed from the placement surface side toward the motor yoke side by the caulking piece. It is configured to be pressed against the mounting surface.

  According to this rotating electrical machine, the mounting portion of the metal plate is pressed against the mounting surface by the caulking pieces being caulked from the mounting surface side formed on the end housing toward the motor yoke side. Therefore, rattling of the metal plate with respect to the end housing can be suppressed.

  The rotating electrical machine according to claim 4 is the rotating electrical machine according to claim 3, wherein the mounting portion is opposed to the mounting surface with a gap and is opposed to an outer edge of the facing portion. A plurality of protrusions that protrude to the mounting surface side from above and are pressed against the mounting surface, and a portion on the outer edge side of the plurality of protrusions in the facing portion is the caulking piece from the mounting surface side. By being caulked toward the motor yoke, the structure is bent toward the motor yoke.

  According to this rotating electrical machine, the plurality of protrusions protruding from the facing portion are pressed against the mounting surface, and the outer edge side portion of the plurality of protrusions in the facing portion is the caulking piece from the mounting surface side to the motor yoke. By being caulked toward the side, it is bent toward the motor yoke side. Therefore, it is possible to suppress the resonance of the metal plate due to the residual stress generated in the outer peripheral portion (portion bent toward the motor yoke) with respect to the plurality of protrusions in the facing portion.

  The rotating electrical machine according to claim 5 is the rotating electrical machine according to claim 3 or 4, wherein a contact surface facing the opposite side of the motor yoke side in the axial direction of the armature is formed in the end housing. In addition, a contact piece that is in contact with the contact surface in the caulking state of the caulking piece is formed at the tip of the extending piece.

  According to this rotating electrical machine, the end housing is formed with a contact surface facing the motor yoke side in the axial direction of the armature, and the contact piece formed at the tip of the extension piece is caulked. In the crimped state of the piece, it is in contact with the contact surface. Therefore, rattling of the metal plate with respect to the end housing can be further suppressed by the contact piece contacting the contact surface.

  The rotating electrical machine according to claim 6 is the rotating electrical machine according to any one of claims 1 to 5, wherein the end housing is provided with a brush that is in sliding contact with a commutator provided in the armature. The metal plate is configured as a noise shield cover that shields noise generated when the commutator and the brush are in sliding contact with each other.

  According to this rotating electrical machine, a noise shield cover as a metal plate is mounted on a resin end housing. Therefore, this noise shield cover can shield noise generated when the commutator and the brush are in sliding contact with each other.

  In order to solve the above-mentioned problem, the assembly method of the rotating electric machine according to claim 7 includes an operation of housing the armature in a cylindrical motor yoke, and the motor yoke in an axial direction along with the motor yoke. A temporary assembly step of providing a resin end housing and closing the opening of the motor yoke with the end housing; and mounting a metal plate on the end housing; and caulking formed on the motor yoke. A fixing step of fixing the end housing and the metal plate to the motor yoke by caulking a piece to the end housing through a part of the metal plate.

  According to this method of assembling a rotating electrical machine, the end housing and the metal plate are fixed to the motor yoke by caulking pieces formed on the motor yoke to the end housing via a part of the metal plate. Accordingly, since the structure for fixing the end housing and the motor yoke is also used for the structure for fixing the metal plate to the motor yoke, the metal plate can be easily fixed to the motor yoke.

It is a perspective view of the rotary electric machine which concerns on one Embodiment of this invention. It is the figure which looked at the caulking structure shown by FIG. 1 from the radial direction outer side of the rotary electric machine. It is a longitudinal cross-sectional view of the noise shield cover shown in FIG. 1 and its peripheral part. It is a figure explaining a mode that a crimping piece shown by FIG. 2 is crimped. It is a figure explaining a mode that the noise shield cover and end housing which are shown by FIG. 3 are fixed to a motor yoke. It is a figure which shows the modification of the noise shield cover and end housing which are shown by FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a rotating electrical machine 10 according to an embodiment of the present invention includes an armature 12, a motor yoke 14, an end housing 16, and a noise shield cover 18 that is an example of a metal plate. Yes.

  The armature 12 has a shaft 20. The armature 12 is a rotor that rotates about the shaft 20. In addition to the shaft 20, the armature 12 includes a core, a winding wound around the core, and a commutator (all not shown) connected to the winding. The core and the commutator are provided coaxially with the shaft 20 and are fixed to the shaft 20.

  The motor yoke 14 is made of metal and is formed in a cylindrical shape that rotatably accommodates the armature 12. More specifically, the motor yoke 14 is configured to surround the core of the armature 12. A magnet (not shown) facing the core of the armature 12 is fixed to the inner peripheral surface of the motor yoke 14.

  The end housing 16 is made of resin. The end housing 16 is provided along with the motor yoke 14 in the axial direction of the armature 12, and closes the opening of the motor yoke 14. A through hole 22 through which the shaft 20 penetrates is formed in the shaft core portion of the end housing 16, and a bearing that rotatably supports the shaft 20 is accommodated around the through hole 22 in the end housing 16. A bearing housing portion 24 is formed.

  Further, a mounting surface 26 facing the motor yoke 14 side in the axial direction of the armature 12 (arrow A1 side) is formed around the bearing housing portion 24 in the end housing 16. The mounting surface 26 is located on the opposite side (arrow A1 side) to the motor yoke 14 side in the axial direction of the armature 12 with respect to the fixing portion 28 in which a corner portion 42 described later is formed. The end housing 16 has a bearing accommodating portion 24 at the top and is formed in a substantially truncated cone shape (mountain shape) in which the axial direction of the armature 12 is a height direction, and the fixed portion 28 is formed in the end housing 16. It is formed in a collar portion which is an end portion on the motor yoke 14 side.

  The fixed portion 28 is formed at the end of the end housing 16 on the motor yoke 14 side with the axial direction of the end housing 16 as a height direction, and has a substantially rectangular shape when viewed in the radial direction of the end housing 16. Yes. In the present embodiment, a pair of fixing portions 28 are provided at a plurality of locations separated in the circumferential direction of the end housing 16. The pair of fixing portions 28 are arranged with a gap in the circumferential direction of the end housing 16.

  Further, the end housing 16 is provided with a brush 30 that is in sliding contact with a commutator provided on the armature 12. The brush 30 is accommodated in a brush box 32 fixed to the end housing 16.

  The noise shield cover 18 is attached to the end housing 16 by covering the end housing 16 from the side opposite to the motor yoke 14 side. The noise shield cover 18 is formed of a metal material (for example, aluminum) that can shield noise generated when the commutator and the brush 30 are in sliding contact with each other.

  The noise shield cover 18 is formed in an annular shape along the periphery of the bearing housing portion 24 and is placed on the placement surface 26, and the extension extending from the placement portion 34 to the motor yoke 14 side. And a protruding piece 36. The extending piece 36 is provided at a position corresponding to the pair of fixing portions 28 described above. A pair of bent pieces 38 are formed at the ends of the extended pieces 36.

  The pair of bent pieces 38, the pair of fixing portions 28 described above, and a pair of caulking pieces 56 described later formed on the motor yoke 14 are caulked to fix the end housing 16 and the noise shield cover 18 to the motor yoke 14. Structure 40 is configured. More specifically, the caulking structure 40 is configured as follows.

  That is, as shown in FIG. 2, the corner portions 42 are respectively formed in the pair of fixing portions 28. More specifically, the corner portion 42 formed on one fixing portion 28 is formed on the upper side in the height direction of the one fixing portion 28 and on the other fixing portion 28 side. Similarly, the corner portion 42 formed on the other fixing portion 28 is more specifically formed on the upper side of the other fixing portion 28 in the height direction and on the one fixing portion 28 side. Each corner 42 is chamfered, and each corner 42 is an inclined surface that is inclined with respect to the axial direction of the end housing 16.

  Further, the upper end surface in the height direction of each fixing portion 28 is formed as an abutment surface 44 facing the opposite side (arrow A1 side) to the motor yoke 14 side in the axial direction of the armature described above. The contact surface 44 is formed continuously with the corner portion 42 that is the inclined surface described above.

  The bent piece 38 is formed across the contact surface 44 and the corner portion 42 described above. A portion of the bent piece 38 corresponding to the corner portion 42 is formed as a contact piece 46, and a portion of the bent piece 38 corresponding to the contact surface 44 is formed as a contact piece 48. Yes. Corresponding to the inclination of the corner portion 42 (the chamfered inclined surface) with respect to the contact surface 44, the contact piece 46 is bent and inclined with respect to the contact piece 48.

  Further, the contact piece 46 has a size and a shape that can come into surface contact with the entire corner portion 42, and the contact piece 48 has a size and a shape that can come into contact with the contact surface 44 on the surface. doing. A positioning portion 50 for positioning is formed on the side of the contact piece 46 opposite to the contact piece 48 side. The positioning portion 50 extends along the side surface 52 of the fixed portion 28 toward the lower side in the height direction of the fixed portion 28.

  A protrusion 54 that protrudes toward the end housing 16 (arrow A1 side) along the axial direction of the motor yoke 14 is formed at the end of the motor yoke 14 on the end housing 16 side. The projecting portion 54 is inserted between the pair of fixed portions 28, and the pair of caulking pieces 56 extend from the tips of the projecting portions 54. The pair of caulking pieces 56 are located between the pair of fixing portions 28 and are formed side by side in a direction opposite to the pair of fixing portions 28.

  The pair of caulking pieces 56 are caulked to the corner portions 42 via the contact pieces 46 in a state where the contact pieces 46 are brought into surface contact with the corner portions 42. Further, the end housing 16 and the noise shield cover 18 are fixed to the motor yoke 14 by the caulking pieces 56 being caulked in this way. Further, the contact piece 48 is in contact with the contact surface 44 in a state where the caulking piece 56 is caulked.

  As shown in FIG. 1, the pair of caulking pieces 56 are caulked from the mounting surface 26 side toward the motor yoke 14 side (arrow A2 side). In this way, the mounting portion 34 is pressed against the mounting surface 26 by caulking the caulking piece 56 from the mounting surface 26 side toward the motor yoke 14 side.

  More specifically, as shown in FIG. 3, the mounting portion 34 includes a facing portion 58 that faces the mounting surface 26 with a gap and a mounting surface from the inner side of the outer edge of the facing portion 58. 26 and a plurality of protrusions 60 pressed against the mounting surface 26. Further, the portion 58A on the outer edge side of the plurality of protrusions 60 in the facing portion 58 is bent toward the motor yoke 14 side by the caulking piece 56 being caulked toward the motor yoke 14 side (arrow A2 side) as described above. Has been.

  Next, a method for assembling the rotating electrical machine 10 will be described.

  First, the operation of housing the armature 12 in the motor yoke 14 shown in FIG. The work and the work of attaching the noise shield cover 18 to the end housing 16 are executed (temporary assembly process).

  In such a temporarily assembled state, as shown in the upper diagram of FIG. 4, the end housing 16 is positioned with respect to the motor yoke 14 by inserting the protruding portion 54 between the pair of fixed portions 28. The Further, the noise shield cover 18 is positioned with respect to the end housing 16 and thus the motor yoke 14 by the positioning portion 50 being locked to the side surfaces 52 of the pair of fixing portions 28. Furthermore, as shown in the upper diagram of FIG. 5, the protrusion 60 contacts the placement surface 26, so that the facing portion 58 is opposed to the placement surface 26 in a separated state.

  In this way, in the state before the caulking piece 56 is caulked, the abutting piece 48 is separated from the abutting surface 44 as shown in the upper diagram of FIG. The length of the extended piece 36 of the noise shield cover 18 is set so that the contact piece 48 is separated from the contact surface 44 in a state before the crimping piece 56 is crimped.

  Subsequently, the caulking piece 56 is caulked from the mounting surface 26 side shown in FIG. 1 toward the motor yoke 14 side (arrow A2 side). That is, the caulking piece 56 is caulked so as to fall down toward the corner portion 42 as shown in the lower diagram of FIG. At this time, the caulking piece 56 is caulked to the corner portion 42 via the contact piece 46 in a state where the contact piece 46 is in surface contact with the corner portion 42. Then, the end housing 16 and the noise shield cover 18 are fixed to the motor yoke 14 by the caulking pieces 56 being caulked in this way (fixing step).

  Further, as described above, when the caulking piece 56 is caulked from the mounting surface 26 side toward the motor yoke 14 side (see FIG. 1), as shown in the lower diagram of FIG. The protrusion 60 is pressed against the placement surface 26. Further, the caulking piece 56 is caulked from the mounting surface 26 side toward the motor yoke 14 side (see FIG. 1), so that the portion 58A on the outer edge side of the plurality of protrusions 60 in the facing portion 58 is Further, the contact piece 48 is in contact with the contact surface 44. The rotating electrical machine 10 is assembled in the manner described above.

  Next, the operation and effect of this embodiment will be described.

  As described above in detail, according to the rotating electrical machine 10 according to the present embodiment, the caulking pieces 56 formed on the motor yoke 14 are part of the noise shield cover 18 as shown in FIG. Thus, the end housing 16 and the noise shield cover 18 are fixed to the motor yoke 14. Therefore, since the structure for fixing the end housing 16 and the motor yoke 14 is also used for the structure for fixing the noise shield cover 18 to the motor yoke 14, the noise shield cover 18 can be easily fixed to the motor yoke 14. it can.

  In addition, the caulking piece 56 is caulked to the corner portion 42 in a state where the contact piece 46 is in surface contact with the corner portion 42. Therefore, since it can suppress that the crimping piece 56 carries out a point contact or a line contact to the corner | angular corner part 42, it can suppress that a stress concentrates locally on the corner | angular corner part 42 (in other words, The surface pressure received by the corner portion 42 can be dispersed). Thereby, damage, such as a crack of the corner part 42, can be suppressed.

  Further, as shown in FIG. 3, the plurality of projections 60 (mounting portion 34) are mounted by caulking pieces 56 being caulked from the placing surface 26 side toward the motor yoke 14 side (arrow A2 side). It is pressed against the mounting surface 26. Therefore, rattling of the noise shield cover 18 with respect to the end housing 16 can be suppressed.

  In addition, the plurality of protrusions 60 are pressed against the mounting surface 26, and the portion 58 </ b> A on the outer edge side of the plurality of protrusions 60 in the facing portion 58 is caulked toward the motor yoke 14 side. (Refer to FIGS. 1 and 2), it is bent to the motor yoke 14 side (arrow A2 side). Therefore, it is possible to suppress the noise shield cover 18 from resonating due to the residual stress generated in the outer peripheral side portion (the portion bent toward the motor yoke 14 side) of the plurality of protrusions 60 in the facing portion 58.

  Further, the end housing 16 is formed with a contact surface 44 facing the side opposite to the motor yoke 14 (arrow A1 side), and the contact piece 48 formed at the tip of the extension piece 36 is a caulking piece. In the caulking state of 56, it is in contact with the contact surface 44. Therefore, rattling of the noise shield cover 18 with respect to the end housing 16 can be further suppressed by the contact piece 48 contacting the contact surface 44.

  A noise shield cover 18 is attached to the resin end housing 16. Therefore, the noise shield cover 18 can shield noise generated due to the sliding contact between the commutator and the brush 30.

  Next, a modification of this embodiment will be described.

  In the above embodiment, the noise shield cover 18 is used as an example of the metal plate. However, for example, a reinforcing plate, a conductive plate, or the like may be used instead of the noise shield cover 18.

  Further, the mounting surface 26 is formed flat, and the plurality of protrusions 60 are in contact with the mounting surface 26. However, as shown in FIG. The protrusion 60 may be fitted in the recess 62. In this case, the recess 62 is a part of the placement surface 26, and the protrusion 60 is fitted into the recess 62 while being pressed against the recess 62.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 12 ... Armature, 14 ... Motor yoke, 16 ... End housing, 18 ... Noise shield cover, 20 ... Shaft, 22 ... Through-hole, 24 ... Bearing accommodating part, 26 ... Mounting surface, 28 ... Fixed 30 ... Brush, 32 ... Brush box, 34 ... Placement part, 36 ... Extension piece, 38 ... Bending piece, 40 ... Caulking structure, 42 ... Corner part, 44 ... Contact surface, 46 ... Contact piece 48 ... abutting piece, 50 ... positioning portion, 52 ... side surface, 54 ... protruding portion, 56 ... caulking piece, 58 ... facing portion, 58A ... a portion on the outer edge side of a plurality of protrusions in the facing portion, 60 ... projection, 62 ... concave

Claims (7)

A cylindrical motor yoke that rotatably accommodates the armature;
A resin end housing that is provided alongside the motor yoke in the axial direction of the armature and closes the opening of the motor yoke;
A metal plate attached to the end housing;
A caulking piece formed on the motor yoke, caulked to the end housing through a part of the metal plate, and fixing the end housing and the metal plate to the motor yoke;
Rotating electric machine with The end housing is formed with corners,
A contact piece as a part of the metal plate is formed on the metal plate,
The caulking piece is caulked to the corner portion via the contact piece in a state where the contact piece is in surface contact with the corner portion.
The rotating electrical machine according to claim 1. The end housing has a mounting surface that is located on the opposite side of the motor yoke side from the corner portion in the axial direction of the armature and faces the opposite side of the motor yoke in the axial direction of the armature. Formed,
The metal plate has a placement portion placed on the placement surface, and an extension piece extending from the placement portion to the motor yoke side and having the contact piece formed at the tip.
The mounting portion is pressed against the mounting surface by the caulking piece being caulked from the mounting surface side toward the motor yoke side,
The rotating electrical machine according to claim 2. The mounting portion includes a facing portion that is opposed to the mounting surface with a gap, and a plurality of protrusions that protrude from the inner side of the opposing portion toward the mounting surface side and are pressed against the mounting surface. Have
The portion on the outer edge side of the plurality of protrusions in the facing portion is bent toward the motor yoke side by the caulking piece being caulked from the placement surface side toward the motor yoke side.
The rotating electrical machine according to claim 3. The end housing is formed with a contact surface facing the side opposite to the motor yoke side in the axial direction of the armature,
A contact piece that is in contact with the contact surface in the caulking state of the caulking piece is formed at the tip of the extending piece.
The rotating electrical machine according to claim 3 or claim 4. The end housing is provided with a brush that is in sliding contact with a commutator provided in the armature,
The metal plate is a noise shield cover that shields noise generated with the sliding contact of the commutator and the brush.
The rotary electric machine as described in any one of Claims 1-5. An operation of housing the armature in a cylindrical motor yoke, an operation of providing an end housing made of resin along with the motor yoke in the axial direction of the armature and closing the opening of the motor yoke with the end housing; A temporary assembly process for performing the work of mounting the metal plate on the end housing;
A fixing step of fixing the end housing and the metal plate to the motor yoke by caulking a caulking piece formed on the motor yoke to the end housing via a part of the metal plate;
A method of assembling a rotating electrical machine comprising:

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