JP2011160583A - Case structure of rotary electric machine, and rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine wherein backlash between respective members can be reduced suitably in a case of snap-fit structure. <P>SOLUTION: On an inner circumferential surface 12b of a yoke 12, a plurality of magnets 15 are provided in the circumferential direction, and spacer members 20 are press-fitted between the magnets 15. The spacer member 20 is equipped with a regulation part 20b which engages with the inner circumferential surface 12b of the yoke 12 and regulates movement thereof in the axial direction when the regulation part abuts, on one end side thereof in the axial direction, against the upper end 14h of an extension 14f provided in the lower end housing 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine case structure and a rotating electrical machine in which a cylindrical yoke and an end housing that closes an opening of the yoke are assembled by a snap-fit structure.

The case of a rotating electrical machine is configured to close an opening of a cylindrical yoke with an end housing as disclosed in Patent Document 1, for example.
In the case of the rotating electric machine as described above, as an assembling method for assembling the end housing to the yoke, an assembling method using a caulking and snap-fit structure or the like is used.

  However, in the case structure in which the yoke and the end housing are assembled by caulking, a dedicated jig (equipment) is required and the processing time tends to be relatively long.

  On the other hand, for example, by assembling the yoke and the end housing with a snap-fit structure in which the engagement convex portion of the end housing that protrudes radially outward is fitted to the through hole formed in the side surface of the yoke. In comparison with the caulking, a dedicated jig or the like is not required. Further, since it is not necessary to perform caulking or the like when assembling, the assembling method using the snap-fit structure can be assembled more easily than caulking.

JP 2008-92641 A

  By the way, in the method of assembling the cylindrical yoke and the end housing with the snap fit structure as described above, a dimensional tolerance or the like is provided so as to securely engage the through hole and the engagement convex portion constituting the snap fit structure. In order to make it in consideration, for example, either the yoke or the end housing moves in the axial direction and there is a risk of rattling.

  The present invention has been made to solve the above-described problems, and the object thereof is to provide a case structure and a rotation of a rotating electrical machine that can more suitably suppress rattling between members in a snap-fit structure case. It is to provide an electric machine.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a cylindrical yoke, an engaging portion engaged with the engaged portion of the yoke by a snap fit structure, and an opening portion of the yoke. A case structure of a rotating electrical machine including an end housing that closes the yoke, and a plurality of magnets provided in a circumferential direction and a spacer member interposed between the magnets are provided on an inner peripheral surface of the yoke, The gist of the spacer member is that the spacer member is configured to abut against an abutting portion provided on the end housing and one end side in the axial direction during assembly to restrict movement in the axial direction.

  According to the present invention, a plurality of magnets provided in the circumferential direction and a spacer member interposed between the magnets are provided on the inner peripheral surface of the yoke, and the spacer member is a contact portion provided in the end housing when assembled. It is comprised so that it may contact | abut to an axial direction one end side. That is, the spacer member interposed by press-fitting between the magnets comes into contact with the end housing, so that the axial displacement of the end housing, i.e., rattling, can be suppressed by the frictional force between the magnet and the spacer member. Further, by restricting the end housing with respect to the axial direction by means of the spacer member, it is possible to restrict displacement in the circumferential direction.

  According to a second aspect of the present invention, the spacer member includes a restricting portion that engages with the inner peripheral surface of the yoke and restricts movement in the axial direction when the spacer member abuts on the one end side in the axial direction. The gist is prepared.

  In this invention, the spacer member is provided with a restricting portion that is engaged with the inner peripheral surface of the yoke and is restricted from moving in the axial direction when contacting the abutting portion of the end housing on one end side in the axial direction. As described above, when the snap fit structure is engaged, the spacer member whose movement in the axial direction is restricted by the restriction portion and the contact portion of the end housing are brought into contact with each other. The relative axial displacement, i.e., rattling, can be further suppressed.

  According to a third aspect of the present invention, in the case structure of the rotating electrical machine according to the first or second aspect, the restricting portion extends from the end of the spacer member on the side opposite to the end housing to the side opposite to the end housing and radially outward. The gist is that it is extended to be inclined.

  In the present invention, the restricting portion extends from the end of the spacer member on the side opposite to the end housing toward the side opposite to the end housing and radially outward. With this configuration, even if the end housing abuts against the spacer member to move to the side opposite to the end housing, the tip of the restricting portion is locked with the inner peripheral surface of the yoke, and the movement is restricted. Is done. For this reason, the shift | offset | difference to the axial direction of an engaged part and an engaging part, ie, shakiness, can be suppressed suitably. Further, when the spacer member is disposed in the yoke, when the spacer member is inserted from the opening on the side opposite to the end housing, the tip of the restricting portion is not in a direction that causes a large resistance, and therefore can be easily inserted.

  According to a fourth aspect of the present invention, in the rotating electrical machine case structure according to any one of the first to third aspects, the spacer member is configured such that the distal end side in the insertion direction has a tapered shape. The gist.

In this invention, since the spacer member is configured so that the distal end side in the insertion direction has a tapered shape, the spacer member can be easily inserted when inserted between the magnets.
According to a fifth aspect of the present invention, in the case structure of the rotating electrical machine according to any one of the first to fourth aspects, the engaging portion is formed to protrude radially outward and is inserted into the yoke. The yoke is engaged with the engaged portion, and the opening portion on the end housing insertion side of the yoke expands as the insertion portion of the engagement portion of the end housing expands toward the opening portion side. The gist is that it is formed in a tapered shape.

  In this invention, the engaging portion is formed to protrude radially outward and is engaged with the engaged portion in a state of being inserted into the yoke, and the opening on the end housing insertion side of the yoke is The insertion part of the engagement part of the end housing is formed in an aspect that becomes a tapered shape that expands toward the opening side. Thus, by making the opening of the yoke into which the engaging portion that protrudes radially outward is inserted into a tapered shape that expands toward the opening, the engaging portion of the end housing becomes an obstacle during insertion. Therefore, the yoke and the end housing can be easily assembled.

The gist of the invention described in claim 6 is that it is configured using the case structure according to any one of claims 1 to 5.
In this invention, the rotary electric machine which can show | play the effect similar to the effect as described in any one of Claims 1-5 can be provided.

  Therefore, according to the above-described invention, it is possible to provide a rotating electrical machine case structure and a rotating electrical machine that can more suitably suppress rattling between members in the case of a snap-fit structure.

It is a whole perspective view of the rotary electric machine in this embodiment. It is sectional drawing of a rotary electric machine. It is a disassembled perspective view for demonstrating a case structure. (A) (b) is sectional drawing for demonstrating a case structure. It is a perspective view of a spacer member. It is a front view of a spacer member.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of the rotating electrical machine of the present embodiment. As shown in FIGS. 1 and 2, the case 11 of the rotating electrical machine 10 of the present embodiment includes a cylindrical yoke 12, an upper end housing 13 that closes the openings 12 a on both sides in the axis L direction of the yoke 12, and a lower end housing 13. Side end housing 14. An upper end housing 13 and a lower end housing 14 are attached to the yoke 12 by a snap-fit structure described later.

  As shown in FIG. 2, a pair of magnets 15 are fixed to the inner peripheral surface 12 b of the yoke 12, and an armature 16 is rotatably supported inside the magnet 15 in the radial direction.

  A spacer member 20 is provided between the pair of magnets 15 so that an elastic force acts in the circumferential direction. As shown in FIGS. 3 and 5, the spacer member 20 has a shape in which the circumferential end portions of two substantially semi-cylindrical members are continuous, and a predetermined elastic force acts between the magnets 15 in the circumferential direction. Thus, the magnet 15 is held. The spacer member 20 is formed with a regulating portion 20b in sliding contact with the inner peripheral surface 12b of the yoke 12 at the center portion of the end portion 20a on one axial side (on the opposite lower end housing 14 side). The restricting portion 20b is formed in such a manner that the tip end side thereof faces in the direction intersecting the axis L and faces radially outward, and extends to the opposite lower end housing 14 side that is the opposite end housing side, that is, obliquely upward. As shown in FIG. 6, the spacer member 20 is formed to have a tapered shape toward the lower side which is the lower end housing 14 side which is the distal end side in the insertion direction.

  The armature 16 includes a rotation shaft 17 at the center in the radial direction, and the rotation shaft 17 is rotatably supported by a total of two ball bearings 18 provided at the center of each of the upper end housing 13 and the lower end housing 14. ing. A commutator 19 is fixed to the rotary shaft 17, and a brush (not shown) provided on the brush holder portion 13 c of the upper end housing 13 is slidably contacted with the commutator 19. For this reason, the armature 16 and the rotating shaft 17 are rotated by exciting a coil (not shown) of the armature 16 from the external power source (not shown) through the brush and the commutator 19.

Next, the structure of the case 11 of this embodiment will be described in detail.
The upper end housing 13 is formed with an insertion hole 13b through which the rotation shaft 17 is inserted at the radial center of the bottom of the substantially disc-shaped main body 13a. And the brush holder part 13c which can insert a brush from the radial direction outer side is formed in the aspect which becomes a 180 degree space | interval of the circumferential direction.

  The upper end housing 13 is formed with a plurality of side walls 13d that protrude in one axial direction from the outer edge of the main body 13a and abut against the open end 12c on the upper side of the yoke 12. Two of the side walls 13d (only one is shown in FIGS. 1 and 3) are formed with extending portions 31 extending in the radial direction at approximately the intermediate position in the axial direction. The protruding portion 31 is formed with a convex portion 32 that is convex along the axial direction on the lower surface in the direction of the axis L. The convex portion 32 is adapted to be fitted to a notch portion 12d formed in a concave shape in the direction of the axis L at the opening end portion 12c on the upper side of the yoke 12. In addition, a protruding piece 33 is formed between the side walls 13d so as to protrude in the axial direction from the outer edge of the main body portion 13a, similarly to the side wall 13d. A total of four projecting portions 34 (only two are shown in FIG. 3) are formed at the tip of the protruding piece 33 as engaging portions projecting radially outward. The projection 34 is fixed by engaging with the upper through hole 12e that penetrates in the radial direction at a predetermined position on the side surface of the yoke 12, that is, the upper end housing 13 is assembled to the yoke 12 by a snap fit structure. It has become.

  The lower end housing 14 is formed with a bottomed cylindrical bearing holding portion 14b at a substantially radial center of a substantially disc-shaped main body portion 14a. The lower end housing 14 is formed with a plurality of rib portions 14c that extend radially outward from the bearing holding portion 14b. The lower end housing 14 is formed with two side walls 14d protruding in the axial direction from the outer edge of the main body portion 14a. In each side wall 14d, two extending portions 14f extending in the axial direction from the axial end portion 14e are formed in a manner of being spaced by about 180 degrees in the circumferential direction. The extended portion 14 f is assembled so as to be positioned between the magnets 15 when the magnet 15 is assembled in the yoke 12.

  Further, two protruding pieces 40 extending from the outer edge of the main body portion 14a to the position of the axial end portion 14e of the side wall 14d are formed between the respective side walls 14d in the circumferential direction, and the protruding pieces 40 are formed. An engaging projection 41 is formed as an engaging portion that protrudes radially outward on the distal end side. The engaging projection 41 engages and is fixed to the lower through hole 12f that penetrates in the radial direction at a predetermined position on the side surface of the yoke 12, that is, the lower end housing 14 is assembled to the yoke 12 with a snap fit structure. It has come to be attached. Further, on the radially outer side surface of the side wall 14d of the lower end housing 14, a total of two extending portions 42 (only one is shown in FIGS. 1 and 3) projecting radially outward are formed. A convex portion 43 that is convex in the direction of the axis L <b> 1 is formed on the upper side surface of the extending portion 42. This convex portion 43 is adapted to be fitted with a notch portion 12h formed in a concave shape in the direction of the axis L at the opening end portion 12g on the lower side of the yoke 12. In addition, in the lower opening 12a of the yoke 12, the insertion portion 12i of the engagement protrusion 41 is formed to have a tapered shape that expands as the lower opening 12a.

Next, the assembly process of the lower end housing 14 and the yoke 12 in this embodiment will be described.
First, the lower end housing 14 is fitted into the lower opening 12 a of the cylindrical yoke 12. Specifically, the lower end housing 14 is fitted into the yoke 12 while being positioned in the circumferential direction by the convex portion 43 of the lower end housing 14 and the lower notch portion 12h of the yoke 12 so as to protrude. The engagement protrusion 41 of the piece 40 engages with the lower through hole 12f of the yoke 12, that is, the yoke 12 and the lower end housing 14 are assembled by a snap fit structure. As described above, the insertion portion 12i of the protrusion 34 in the lower opening 12a is formed to have a tapered shape that expands toward the lower opening 12a. For this reason, when the lower end housing 14 is fitted to the yoke 12, even if a part thereof is inserted from the lower opening 12a, it is possible to suppress the protrusion 34 from being an obstacle at the time of insertion. It can be easily inserted.

  Next, the two magnets 15 are assembled and fixed along the inner peripheral surface 12 b of the yoke 12. At this time, the extended portion 14f formed in the lower end housing 14 is positioned and fitted between the two magnets 15 so as to be fitted. The magnet 15 may be assembled to the inner peripheral surface 12b of the yoke 12 in advance before the engaging protrusion 41 of the protruding piece 40 is engaged with the lower through hole 12f of the yoke 12.

  Next, the spacer member 20 is press-fitted between the magnets 15. At this time, while the spacer member 20 is in sliding contact with the inner peripheral surface 12b, until the end surface 20c opposite to the restricting portion 20b contacts the upper end 14h of the extending portion 14f of the lower end housing 14 as shown in FIG. insert. As described above, since the spacer member 20 has a tapered shape toward the lower end housing 14 which is the front end side in the entry direction, it can be easily inserted between the magnets 15. Moreover, since the spacer member 20 is press-fitted between the magnets 15, the movement of the spacer member 20 in the axial direction can be restricted. For this reason, the axial displacement of the lower end housing 14 in contact with the end surface 20c of the spacer member 20, that is, rattling can be suppressed. Further, after contacting the upper end 14 h of the extended portion 14 f of the lower end housing 14, the restricting portion 20 b of the spacer member 20 acts, so that the engaging protrusion 41 of the protruding piece 40 is below the yoke 12. Even if it is engaged with the side through hole 12f, that is, assembled by a snap fit structure, the occurrence of rattling can be further suppressed. Even if the spacer member 20 is slidably brought into sliding contact with the inner peripheral surface 12b, the restricting portion 20b extends to the side opposite to the lower end housing 14, so that the obstacle during insertion is minimized. Be able to.

Next, characteristic effects of the present embodiment will be described.
(1) A plurality of magnets 15 provided in the circumferential direction and a spacer member 20 interposed by press-fitting between the magnets 15 are provided on the inner peripheral surface 12 b of the yoke 12. The spacer member 20 is configured to come into contact with the upper end 14h of the extending portion 14f provided in the lower end housing 14 and one end side in the axial direction when assembled. That is, when the spacer member 20 interposed by press-fitting between the magnets 15 contacts the lower end housing 14, the axial displacement of the lower end housing 14 due to the frictional force between the magnet 15 and the spacer member 20, that is, The rattling can be suppressed. Further, by restricting the lower end housing 14 with respect to the axial direction by the spacer member 20, it is possible to restrict displacement in the circumferential direction.

  (2) The spacer member 20 is engaged with the inner peripheral surface 12b of the yoke 12 in the axial direction when contacting the upper end 14h of the extending portion 14f provided on the lower end housing 14 on one end side in the axis L direction. The control part 20b which controls the movement of is provided. As described above, the upper end 14h of the extended portion 14f of the lower end housing 14 is brought into contact with the spacer member 20 that is restricted from moving in the axial direction by the restricting portion 20b when engaged by the snap-fit structure. A shift in the relative axial direction between the lower through-hole 12f and the engaging projection 41, that is, rattling, can be more suitably suppressed.

  (3) The restricting portion 20b extends from the end 20a of the spacer member 20 on the opposite lower end housing 14 side so as to incline toward the opposite lower end housing 14 and radially outward. With such a configuration, even if the upper end 14 h of the extended portion 14 f of the lower end housing that contacts the spacer member 20 tries to move to the side opposite to the lower end housing 14, the restricting portion 20 b can move to the inner periphery of the yoke 12. The movement with the surface 12b is restricted. For this reason, the shift | offset | difference to the axial direction of the lower through-hole 12f and the engagement protrusion part 41, ie, shakiness, can be suppressed suitably. Further, when the spacer member 20 is disposed in the yoke 12, when the spacer member 20 is inserted through the opening 12a on the side opposite to the lower end housing 14 (lower side) of the yoke 12, the tip of the restricting portion 20b becomes a large resistance. Since it is not a direction, it can be easily inserted.

  (4) The engagement protrusion 41 is formed to protrude outward in the radial direction, and is engaged with the lower through hole 12 f while being inserted into the yoke 12. The opening 12a on the insertion side (lower side) of the lower end housing 14 of the yoke 12 has a taper shape in which the insertion site 12i of the engagement protrusion 41 of the lower end housing 14 expands toward the lower opening 12a side. Is formed. In this way, the engagement protrusion 41 is obstructed during insertion by forming a taper shape in which the opening 12a on the lower side of the yoke 12 into which the engagement protrusion formed to protrude radially outward is inserted is expanded. Therefore, the yoke 12 and the lower end housing 14 can be easily assembled.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, two magnets 15 are provided, but the number is not limited to this.

In the above embodiment, the spacer member 20 is configured so that the distal end side in the insertion direction has a tapered shape, but the present invention is not limited to this.
In the above embodiment, when a part of the lower end housing 14, which is an end housing, is inserted, the opening 12 a on the insertion side (lower side) of the lower end housing 14 of the yoke 12 is engaged with the lower end housing 14. Although the insertion part 12i of the joint protrusion part 41 was formed in the aspect which becomes a taper shape, it is not restricted to this.

In the above embodiment, the spacer member 20 is provided with one restricting portion 20b. However, the present invention is not limited to this. For example, a configuration in which a plurality of restricting portions 20b having the same shape is provided may be employed.
In the above embodiment, the restriction member 20b is provided on the spacer member 20. However, a structure in which the restriction member 20b is omitted may be employed.

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 11 ... Case, 12 ... Yoke, 12a ... Opening part, 12b ... Inner peripheral surface, 12f ... Lower through-hole (engaged part), 12i ... Insertion site, 14 ... Lower end housing (end) (Housing), 14h ... upper end (contact portion), 15 ... magnet, 20 ... spacer member, 20a ... end portion, 20b ... regulating portion, 41 ... engaging protrusion (engaging portion).

Claims (6)

A cylindrical yoke,
A rotating electrical machine case structure having an engagement portion engaged with an engaged portion of the yoke by a snap-fit structure and an end housing that closes an opening of the yoke;
The inner peripheral surface of the yoke is provided with a plurality of magnets provided in the circumferential direction and a spacer member interposed between the magnets,
A case structure for a rotating electrical machine, wherein the spacer member is configured to abut against an abutting portion provided on the end housing at the time of assembly and to one end side in the axial direction to restrict movement in the axial direction. In the rotating electrical machine case structure according to claim 1,
The rotating electrical machine characterized in that the spacer member includes a restricting portion that is engaged with the inner peripheral surface of the yoke and restricts movement in the axial direction when the spacer member abuts on the one end side in the axial direction. Case structure. In the rotating electrical machine case structure according to claim 2,
2. The rotating electrical machine case structure according to claim 1, wherein the restricting portion extends from the end of the spacer member on the side opposite to the end housing toward the side opposite to the end housing and radially outward. In the case structure of the rotating electrical machine according to any one of claims 1 to 3,
A case structure of a rotating electrical machine, wherein the spacer member is configured to have a tapered shape at a distal end side in an insertion direction. In the case structure of the rotating electrical machine according to any one of claims 1 to 4,
The engaging portion is formed to protrude radially outward and is engaged with the engaged portion in a state of being inserted into the yoke.
The opening of the yoke on the end housing insertion side is formed in such a manner that the insertion portion of the engagement portion of the end housing has a tapered shape that expands toward the opening side. Construction.   A rotating electrical machine comprising the case structure according to any one of claims 1 to 5.

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