JP2012023845A - Solid state structure and driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid state structure for a case of an electric motor which can firmly fix and can achieve stable mass production.SOLUTION: A solid state structure which has a metallic container 20 having a cylindrical peripheral wall 22 with one end open fixed with a columnar fitting member 30 having a fitting part to be fitted into the opening comprises: multiple bent pieces 51 formed as a set with the peripheral wall 22 which extends diagonally to the opening in relation to the center line of the peripheral wall 22 and is bent into the plate thickness direction of the peripheral wall 22; and at least one concavity 52 provided so as to correspond to the bent piece 51 in a peripheral surface of the fitting part. The concavity 52 has multiple supporting surfaces which slope corresponding to the slope of the bent piece 51, the bent piece 51 has a first bent piece 51 and a second bent piece 51 which have the extention direction of the bent piece 51 facing against each other in the circumferential direction of the peripheral wall 22, and the first bent piece 51 and the second bent piece 51 contact the supporting surface.

Description

  The present invention relates to a fixing structure suitable for a driving device such as a motor.

  For example, when the cover is assembled to the bracket of the motor, it can be firmly fixed in both the axial direction and the circumferential direction. Therefore, a plurality of fastening holes penetrating in the axial direction are formed in these flanges, and screws or the like are inserted therein. Fastening and fixing is generally performed.

  However, in such a structure, it is essential to obtain a squareness, and there is a disadvantage that the yield is deteriorated because it is necessary to provide a cutting allowance. In addition, in order to properly assemble the flanges, press work alone is not sufficient, and post-processing by machining is necessary to perform the surface formation, which is disadvantageous from the viewpoint of productivity. Furthermore, there are members such as screws, and it takes time for fastening work.

  On the other hand, a screwless motor fixed by caulking without being fastened is disclosed (Patent Document 1).

The envelope of this motor is composed of a bottomed cylindrical deep-drawn metal case and a flange plate fixed to the opening of the case. The flange plate is fixed to the case by fixing the outer peripheral portion of the flange plate with a plurality of caulking portions that bend a part of the opening of the case at a right angle.
JP-A-9-205751

  However, in the case of the motor of Patent Document 1, since the outer peripheral portion of the flange plate is simply pressed by the caulking portion, the flange plate may be displaced in the circumferential direction. In addition, the mounting position (axial direction side) of the flange plate to the case is fixed at one point depending on the bent part of the crimped part (edge part of the opening), so it is easily affected by dimensional errors during molding and stable during mass production. There is also a disadvantage that lacks sex.

  Further, in order to bring the crimped portion into surface contact with the flange plate, it is necessary to bend the crimped portion with high accuracy at a right angle, but it is difficult to do so. Usually, the tip of the caulking portion is often bent and is in line contact in many cases. However, in such a case, since the flange plate is shaved to generate shavings, the shavings may become a contamination source and cause a problem with the motor.

  Accordingly, an object of the present invention is to provide a fixing structure that can be firmly fixed and stably mass-produced.

  The present invention is a fixing structure for fixing a columnar fitting member having a fitting portion fitted into the opening to a metal container having a cylindrical peripheral wall having one end opened. A plurality of bending pieces that are integral with the peripheral wall and that extend obliquely toward the opening with respect to the center line of the peripheral wall and bend in the thickness direction of the peripheral wall, and the peripheral surface of the fitting portion, And at least one recess provided to correspond to the bent piece. The concave portion has a plurality of support surfaces that incline corresponding to the inclination of the bent piece, and the bent piece has a first direction in which the extending direction of the bent piece is opposite to each other in the circumferential direction of the peripheral wall. It has a bent piece and a second bent piece. The first bent piece and the second bent piece are configured to contact the support surface.

  According to the fixing structure having such a configuration, the first bent piece and the second bent piece that extend obliquely in opposite directions toward the opening and are bent in the thickness direction of the peripheral wall are provided on the peripheral wall. Yes. Furthermore, a plurality of support surfaces that are inclined in accordance with the inclination of the bent piece are provided in at least one of the concave portions provided in correspondence thereto. Then, since the first bent piece and the second bent piece are configured to come into contact with the support surface, each bent piece is easily brought into surface contact with the corresponding support surface. Therefore, it can fix stably and can suppress generation | occurrence | production of shavings.

  Further, the positioning can be easily performed in the circumferential direction only by roughly positioning the concave portion and the defect portion and bending each bent piece. Furthermore, each bent piece and each support surface have a fixed angle with respect to both the center line direction and the circumferential direction, so even if there is some molding error or variation between the bent piece and the support surface. These can be absorbed and are excellent in productivity. Moreover, since the component force that fixes in the circumferential direction and the component force that acts on the side opposite to the opening in the center line direction can be obtained at the same time, misalignment, rattling, and the like can be prevented.

It is a schematic perspective view of the drive device of this embodiment. It is a schematic sectional drawing of a drive device. It is a schematic side view which shows the part of a defect | deletion part. (A) is a schematic plan view of a recessed part, (b) is a schematic side view of a recessed part. It is a schematic side view for demonstrating the effect | action of a fixing structure. It is a schematic plan view which shows the modification of this embodiment. It is a schematic plan view which shows another modification of this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

  1 and 2 show a motor 1 (driving device) to which the fixing structure of the present invention is applied. The motor 1 has a substantially cylindrical appearance and includes a motor case 20 (container), a cover 30 (fitting member), a motor main body 40, and the like.

  The motor case 20 is, for example, a cylindrical metal container having an opening 21 at one end formed by pressing, and has a cylindrical peripheral wall 22 and a bottom wall 23 that closes the other end.

  The cover 30 is a columnar member that is made of, for example, a synthetic resin or metal and closes the opening 21 of the motor case 20. A through hole 31 penetrating along the center line A of the cover 30 is formed at the center of the cover 30 in the radial direction. The cover 30 has a fitting portion having an outer diameter slightly smaller than the inner diameter of the opening 21 of the motor case 20. The fitting portion is fitted into the opening 21 of the motor case 20 and fixed, whereby the motor case 20 is fixed. The opening 21 is closed. In the present embodiment, the cover 30 itself is a fitting portion, and the outer surface 32 of the cover 30 fixed to the motor case 20 is designed to be aligned with the edge of the peripheral wall 22 on the opening 21 side.

  A motor body 40 composed of a shaft 41 or the like is accommodated in the motor case 20 that is closed by the cover 30. The shaft 41 is connected to the center line A of the cover 30 and the motor case 20 by the lower bearing 2 attached to the center portion of the bottom wall 23 of the motor case 20 and the upper bearing 3 attached to the through hole 31 of the cover 30. It is supported so that it can rotate freely. One end of the shaft 41 protrudes from the through hole 31 to the outside of the cover 30.

  The motor body 40 is the same as the conventional motor 1 and is composed of a rotor, a stator and the like (not shown), and rotationally drives the shaft 41 by an electric current supplied from the outside.

  The motor 1 is a screwless motor that does not need to be fastened with screws or the like. The motor 1 is provided with a fixing structure 50 that can fix the cover 30 only by bending a part of the motor case 20.

  The fixing structure 50 of the present embodiment is provided at two locations on the edge of the motor 1 on the opening 21 side, and is disposed so as to face each other in the radial direction. Each of these fixing structures 50 is provided with two bent pieces 51 provided on the motor case 20 and bent at the time of fixing, and one recess 52 provided on the cover 30.

  FIG. 3 shows a bent piece 51 before bending. At the end on the opening 21 side of the peripheral wall 22, two missing portions 24 are formed corresponding to two portions where the fixing structure 50 is formed, and a part of the peripheral wall 22 is formed in an inverted trapezoidal shape. . Specifically, each deficient portion 24 is connected to the lower bottom edge portion 24a positioned one step lower than the end edge 22a of the peripheral wall 22, and the end and the end edge 22a of the lower bottom edge portion 24a. It has a pair of side edge parts 24b and 24b which incline toward the end toward 22a.

  A bent piece 51 is provided integrally with the peripheral wall 22, one for each of the side edge portions 24 b of each of the defect portions 24. That is, in the present embodiment, in the circumferential direction of the peripheral wall 22, there is one first bent piece 51 a and one second bent piece 51 b in which the extending directions of the bent pieces 51 are opposite to each other. It is provided one by one. Each bent piece 51 has a substantially rectangular plate shape that extends obliquely toward the opening 21 with respect to the center line A of the peripheral wall 22 (in the present embodiment, about 45 °). The extending direction is substantially orthogonal to the extending direction of the side edge 24b.

  Each of the bent pieces 51 is located inside the defect portion 24. That is, it arrange | positions so that the front-end | tip of each bending piece 51 may not protrude outside exceeding the edge 22a of the surrounding wall 22. As shown in FIG. Therefore, since the defect portion 24 and the bent piece 51 can be formed by punching the peripheral wall 22 once by press working, the member cost and mass productivity are excellent.

  FIG. 4 shows the recess 52 of the cover 30. (A) of the figure is the figure seen from the direction of the centerline A of the cover 30, (b) of the figure is a figure seen from the radial direction outer side orthogonal to it. The concave portions 52 are provided at two positions corresponding to the bent pieces 51 on the peripheral surface of the cover (fitting portion) 30.

  As shown in these drawings, each recess 52 is provided at the edge portion at the end of the cover 30 on the opening 21 side, and has a substantially trapezoidal mortar shape with its center line A side and the radially outer side opened. is doing. Each recess 52 includes a first support surface 53 and a second support surface 54 that incline corresponding to the inclinations of the first bent piece 51a and the second bent piece 51b, and a bottom surface 55 that continues to the lower edge of these support surfaces. And a bottom surface 55 and an inner side surface 56 connected to the radially inner side edge of these support surfaces.

  Specifically, each of the support surfaces 53 and 54 is inclined in a direction from the bottom surface 55 side of the recess 52 toward the opening 21 (45 ° with respect to the center line A). The side edges 53a and 54a extend in a direction orthogonal to the direction in which each bent piece 51 extends as viewed from the outside in the radial direction. The support surfaces 53 and 54 are also inclined so as to radially expand from the center in the radial direction in the direction from the inner surface 56 side of the recess 52 toward the radially outer side.

  As shown in FIG. 5, the defect portion 24 is formed to be slightly larger than the recess 52 in relation to the recess 52, and its edge, in particular, each side edge portion 24 b is connected to each edge of the recess 52 (each support). It is formed so as to be located on the outer side (side edge on the radially outer side of the surface) with a predetermined bending margin h.

  After the cover 30 is fitted into the opening 21 of the motor case 20, each bent piece 51 is bent in the plate thickness direction (inward in the radial direction) and brought into surface contact with the respective support surfaces 53 and 54 of the recess 52, respectively. The motor case 20 is fixed.

  At this time, since the bending allowance h is formed in the defect portion 24, it can be bent stably in the middle of the bent piece 51 even if there is a variation in molding or the like. Therefore, each bent piece 51 can be stably brought into surface contact with the support surfaces 53 and 54 and can be firmly fixed.

  Since the first bent piece 51a and the second bent piece 51b extending in the oblique directions opposite to each other in the circumferential direction of the peripheral wall 22 are bent at an angle with respect to the center line A, the concave portion 52 and the missing portion 24 are bent. The cover 30 gradually moves to a predetermined position by the action of the component force fr in the oblique direction by simply positioning each of the bent pieces 51 and positioning them in the circumferential direction.

  Since each bent piece 51 and each support surface 53, 54 have a fixed angle with respect to both the center line A direction and the circumferential direction, each bent piece 51 and each support surface 53, 54 are stabilized. Surface contact. Even if there is a slight molding error or variation between the recess 52 and the defect 24, these can be easily absorbed, so that the productivity is excellent.

  Moreover, as shown in FIG. 5, for example, even if a force that pushes up the cover 30 or shifts in the circumferential direction by the rotation of the shaft 41 is applied, the component force fr that is fixed in the circumferential direction at the surface contact portion. And a component force fs acting in the direction opposite to the opening 21 in the direction of the center line A can be obtained at the same time, so that misalignment and rattling, removal of the cover 30, etc. can be prevented, and generation of shavings It can be effectively suppressed.

  Further, since the support surfaces 53 and 54 are inclined so as to be gradually separated from the inner surface 56 side of the recess 52 toward the radially outer side, the bent pieces 51 do not have to be bent greatly to a right angle. The surfaces 53 and 54 are contacted. Accordingly, each bent piece 51 is more likely to come into surface contact with the support surfaces 53 and 54, so that generation of shavings can be more effectively prevented.

  Note that the fixing structure and the like according to the present invention are not limited to the above-described embodiment, and include various other configurations.

  For example, as shown in FIG. 6, the number of fixing structures 50 is not limited to two, but may be one or three or more. In addition, in the case of three or more, it is not necessary to arrange opposingly in the circumferential direction.

  Further, it is not necessary to provide the first bent piece 51a and the second bent piece 51b for each fixing structure 50, and one motor 1 is provided with at least one first bent piece 51a and one second bent piece 51b. Therefore, it is sufficient that at least one recess 52 is provided corresponding to these. For example, as shown in FIG. 7, two concave portions 52 are provided opposite to each other, only one first bent piece 51 a is provided on one of the concave portions 52, and only one second bent piece 51 b is provided on the other side. be able to.

  The drive device is not limited to a motor. It may be an actuator or the like.

20 Motor case (container)
21 Opening 22 Peripheral wall 30 Cover (fitting member)
50 fixing structure 51 bent piece 51a first bent piece 51b second bent piece 52 recessed portion 53 first support surface 54 second support surface A center line

Claims (6)

A fixing structure for fixing a cylindrical fitting member having a fitting portion fitted into the opening to a metal container having a cylindrical peripheral wall having one end opened,
A plurality of bent pieces that are integral with the peripheral wall and obliquely extend toward the opening with respect to the center line of the peripheral wall and bend in the thickness direction of the peripheral wall;
On the peripheral surface of the fitting portion, at least one recess provided to correspond to the bent piece;
With
The concave portion has a plurality of support surfaces that incline corresponding to the inclination of the bent piece,
The bent piece has a first bent piece and a second bent piece in which the extending direction of the bent piece is opposite to each other in the circumferential direction of the peripheral wall;
The first bent piece and the second bent piece are fixed structures in contact with the support surface. The fixing structure according to claim 1,
The support structure is a fixed structure that is inclined in a direction from the bottom of the recess toward the opening. In the fixing structure according to claim 1 or 2,
The peripheral wall is provided with a plurality of missing portions formed by lacking the peripheral wall,
The fixing structure in which the bent piece is provided at an edge of the defect portion, and the entire bent piece is located inside the defect portion. The fixing structure according to claim 3,
The defect structure is a fixing structure in which the defect portion is formed to be slightly larger than the concave portion, and an edge thereof is positioned outside the edge of the concave portion with a predetermined bending margin. In the fixing structure according to any one of claims 1 to 4,
A fixing structure in which each of the first bent piece and the second bent piece is provided in each of the recesses.   A driving device having the fixing structure according to any one of claims 1 to 5.

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