JP5962857B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine having a seal structure, for example, a motor for driving a power steering mechanism.

In automobiles, a relatively small motor is mounted to drive an oil pump, a power steering mechanism, and the like. In general, motors mounted on automobiles are subject to sand and dust on the road surface when traveling, and often have rainwater in rainy weather, so there is a concern that these foreign objects may enter the motor and deteriorate the service life. Is done. For example, a motor described in Patent Document 1 has been proposed as a motor having a structure (seal structure) that prevents foreign matters such as water and dust from entering the motor.
The motor described in Patent Document 1 has a cylindrical case main body (yoke) having one end opened and a flange provided on the outer periphery of the open end, and an end cover (housing) that has a hollow portion and is in contact with the flange. ) In which the end cover is provided with a recess opened on the outer side in the radial direction of the motor case and on the flange side, and the end surface of the end cover contacting the flange is provided in the circumferential direction of the case body. The sealing resin is formed in the recess of the end cover and the inside of the sealing groove with the opening to the case body side closed by the flange fastened to the end cover. The sealing resin seals the gap between the flange and the end cover. The filled sealing resin fills the end cover and the flange. The gap between the end cover and the flange is filled by filling the minute recesses formed on the opposite surface of the screw and the gap between the two to prevent foreign objects from entering the motor. The seal structure to prevent is enabled.

JP 2007-166682 A

  The motor described in Patent Document 1 seals between the flange (case main body) and the end cover by a filled sealing resin. However, depending on the filling pressure and filling time when filling the sealing resin, the sealing resin may leak out of the motor from the contact surface, and the leaked sealing resin adheres to the end cover or flange. As a result, the appearance may be impaired. Further, when the sealing resin adheres during the assembling work, a work for removing the sealing resin is required separately, which causes a problem that workability is lowered.

  An object of the present invention is to solve the above-described problems. In a rotating electrical machine having a seal structure, adhesion of a sealing resin during assembly work is reduced and the appearance is reduced. The object is to obtain a rotating electrical machine that does not lose.

  In the rotating electrical machine according to the present invention, one end is open, a flange is provided on the outer periphery of the open end, a cylindrical yoke having a through-hole through which a fastening member passes, and an outer periphery of the open end. The housing is fastened to the yoke by the fastening member, and has a recess on the outer periphery on the yoke side that opens radially outward and on the yoke side, and is fitted into the recess to fit the housing. A grommet to be attached, and a sealing resin filled in a contact surface between the flange and the grommet, and the fastening member is located on one circumferential side surface of the recess, and the recess On the other circumferential side surface, a rib portion covering the outer periphery of the contact surface with the yoke is provided.

  According to the present invention, in a rotating electrical machine having a seal structure, it is possible to provide a rotating electrical machine in which the adhesion of sealing resin during assembly work is reduced and the appearance is not impaired.

It is the disassembled perspective view which showed the yoke 1, the housing 2, and the grommet 3 used with the motor 100 which concerns on Embodiment 1 of this invention. FIG. 3 is a perspective view showing a state in which the yoke 1 is placed on the housing 2 of FIG. FIG. 3 is an enlarged view of the vicinity of an extension part 2 f of the housing 2 of FIG. 2. FIG. 8 is a view showing a modification of the yoke 1 of FIG. FIG. 6 is a view showing a modification of the grommet 3 in FIG. 1, and is a partial cross-sectional view showing the vicinity of the end face of the grommet 3 on the yoke 1 side. FIG. 6 is a view showing another modification of the grommet 3 in FIG. 1, and is a partial cross-sectional view showing the vicinity of the end face of the grommet 3 on the yoke 1 side. FIG. 6 is a view showing still another modified example of the grommet 3 in FIG. It is the disassembled perspective view which showed the yoke 1, the housing 12, and the grommet 13 used with the rotary electric machine which concerns on Embodiment 2 of this invention. It is an enlarged view of the contact surface 13c vicinity of the grommet 13 of FIG.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. In each of the drawings, the same or equivalent members and parts will be described with the same reference numerals.
1 is an exploded perspective view showing a yoke 1 used in a motor 100 according to Embodiment 1 of the present invention, a housing 2, and a grommet 3. FIG. 2 is a view showing a yoke on the housing 2 to which the grommet 3 is attached. FIG. 3 is a perspective view showing a state in which the yoke 1 and the housing 2 are fastened together with 1 placed thereon, and FIG. 3 is an enlarged view of the vicinity of the extending portion 2f of the housing 2 in FIG.

  In FIG. 1, a motor 100 that is a rotating electrical machine has a cylindrical yoke 1 that is open at one end and provided with a flange 1b on the outer periphery of the open end 1a, and a housing that is in contact with the flange 1b and fastened to the yoke 1. 2 and a grommet 3 through which a connecting wire 5 such as a lead wire led out from a motor main body accommodated in the housing 2 passes. A plurality of through holes 1c through which screws 6 (fastening members) penetrate in the axial direction are formed in the flange 1b.

  On the outer periphery of the housing 2 on the yoke 1 side, a recess 2 a is formed that opens in two directions, ie, the outer side in the radial direction of the housing 2 and the yoke 1 side. A plurality of fastening holes 2b to which screws 6 are fastened are formed at positions corresponding to the through holes 1c formed in the flange 1b when the yoke 1 and the housing 2 are fastened. One of the fastening holes 2b1 is formed on one circumferential side surface 2c (left side in FIG. 3) of the recess 2a. That is, the screw 6a (fastening member) is located on one circumferential side surface 2c of the recess 2a. The other circumferential side surface 2d (right side in FIG. 3) of the recess 2a has a tray-shaped extension 2f (rib portion) in which the sealing resin 4 leaking out of the motor 100 from the contact surface 2e with the flange 1b accumulates. ) Is provided (see FIG. 3). The extending portion 2 f extends in the circumferential direction from the other circumferential side surface 2 d of the recess 2 a and is formed integrally with the housing 2. Although FIG. 3 shows the case where the extending portion 2f is in the shape of a tray so that the sealing resin 4 leaking from the contact surface 2e is collected, the present invention is not limited to this case, and the recess 2a of the housing 2 is shown. The outer circumferential side surface 2d of the yoke 1 and the flange 1b of the yoke 1 only need to cover the outer periphery of the contact surface 2e, cover the outer periphery of the contact surface 2e, and there is no bottom portion of the tray, It may have a shape penetrating in the axial direction.

The grommet 3 is made of an insulating material having elasticity such as rubber, and is integrally formed with the O-ring portion 3a as shown in FIG. The O-ring portion 3a is disposed radially inward of the end surface of the housing 2 on the yoke 1 side. When the yoke 1 is placed on the housing 2 and the flange 1b is brought into contact with the housing 2, the O-ring 3a is pressed. Thus, the space between the yoke 1 and the housing 2 is sealed.
Further, the grommet 3 is attached to the housing 2 by fitting in a compressed state in the recess 2 a of the housing 2. The grommet 3 is formed with a plurality of (two in the illustrated example) through-holes 3b through which the connection lines 5 penetrate, and the connection lines 5 are drawn out of the motor 100 through the through-holes 3b.
A contact surface 3c for contacting the flange 1b is formed on the end surface of the grommet 3 on the yoke 1 side, and a sealing resin 4 is filled inside the contact surface 3c in the radial direction so that the flange 1b and the grommet 3 are in contact with each other. , The portion of the contact surface 3c filled with the sealing resin 4 (in the radial direction of the contact surface 3c) is sealed. The end face of the grommet 3 on the yoke 1 side is provided with a recess 3d that is recessed outward in the radial direction from the contact surface 3c filled with the sealing resin 4. A part of the recess 3d shown in FIG. 3 (inner side in the radial direction) is covered with the flange 1b. Further, the sealing resin 4 leaking from the contact surface 3c is accumulated in the recess 3d.

Next, an outline of the assembly procedure of the motor 100 will be described with reference to FIGS. By fitting the grommet 3 into the recess 2 a of the housing 2, the grommet 3 is attached to the housing 2 together with a brush holder (not shown).
After the grommet 3 is attached to the housing 2, the molten sealing resin 4 is applied to the inside in the radial direction of the contact surface 3 c of the grommet 3 (in the vicinity of the O-ring 3 a in the illustrated example), and the flange 1 b and the grommet 3 The contact surface 3c is filled with resin. Finally, as shown in FIG. 2, the yoke 1 is placed on the housing 2, the flange 1 b is brought into contact with the contact surface 3 c of the housing 2 and the grommet 3, and the yoke 1 and the housing 2 are connected by screws 6. The motor 100 is assembled by fastening. In the assembled motor 100, the space between the yoke 1 and the grommet 3 is sealed with the sealing resin 4 filled in the contact surface 3 c of the grommet 3. Further, the yoke 1 and the housing 2 are sealed by an O-ring 3 a formed integrally with the grommet 3. In the first embodiment, the case where the space between the yoke 1 and the housing 2 is sealed by the O-ring 3a has been described. However, in order to seal more reliably, the contact between the yoke 1 and the housing 2 is not limited. The sealing resin 4 may also be applied to the contact surface (including the contact surface 2e between the flange 1b and the other circumferential side surface 2d of the recess 2a). In this case, both the yoke 1 and the housing 2 and between the yoke 1 and the grommet 3 are sealed with the sealing resin 4.

As the sealing resin 4, it is preferable to use a resin having good adhesion and water resistance, for example, a silicone resin, which is required as a sealing structure.

  As described above, the motor 100 (rotary electric machine) according to the first embodiment of the present invention is in contact with the flange 1b and the cylindrical yoke 1 having one end opened and the flange 1b provided on the outer periphery of the open end. The screw 6 (fastening member) is fastened to the yoke 1 and is fitted in the recess 2a with a housing 2 having a recess 2a that opens radially outward and on the yoke 1 side on the outer periphery of the yoke 1 side. Thus, the grommet 3 attached to the housing 2 and the sealing resin 4 filled in the contact surface 3c between the flange 1b and the grommet 3 are provided, and one circumferential side surface 2c (left side in FIG. 3) of the recess 2a is provided. ), The screw 6a is positioned, and the other circumferential side surface 2d (right side in FIG. 3) of the recess 2a has an extended portion 2f (rib portion) covering the outer periphery of the contact surface 2e with the yoke 1. Is provided The grommet 3 is attached to the flange 2, the sealing resin 4 is filled in the contact surface 3c between the flange 1b and the grommet 3, the yoke 1 is placed on the housing 2, and the flange 1b is attached to the housing 2 and the grommet. When the yoke 1 is attached to the housing 2 by being brought into contact with the abutment surface 3c and being fastened with the screws 6, the sealing resin 4 is radially formed on the end surface (abutment surface 3c) of the grommet 3. The seal resin 4 leaks to the outside of the motor 100 from the contact surface 2e. The leaked seal resin 4 is covered by the extending portion 2f. The adhesion of the sealing resin 4 is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

  Here, when the contact surface 3 c of the grommet 3 is filled with the sealing resin 4, the yoke 1 is placed on the housing 2, and the flange 1 b is only in contact with the contact surface 3 c of the grommet 3. In the first embodiment of the present invention, the sealing resin 4 flows out uniformly in the radial direction or the circumferential direction without being biased to a specific radial position or a specific circumferential position. The extension 2f that covers the outer periphery of the contact surface 2e between the other circumferential side surface 2d of 2a and the yoke 1 is opposite to one circumferential side surface 2c of the recess 2a in which the screw 6a that is a fastening member is located. Therefore, the fastening force of the screw 6a acts by being fastened by the screw 6a. As a result, most of the sealing resin 4 filled in the contact surface 3c is indicated by a thick arrow in FIG. Of the recess 2a on the side where the screw 6a is fastened ( The sealing resin 4 that has flowed from the circumferential side surface 2c to the opposite (other) circumferential side surface 2d and leaked from the contact surface 2e is transferred to the (other) circumferential side surface 2d. Since it is covered by the provided extending portion 2f, most of the sealing resin 4 leaking out of the motor 100 can be reliably covered.

Further, according to the first embodiment of the present invention, since the extending portion 2f covering the outer periphery of the contact surface 2e is formed integrally with the housing 2, only the shape change of the mold when the housing 2 is molded is performed. Thus, since it is possible to provide the extending portion 2f, rotation without causing a significant increase in cost and reducing the adhesion of the sealing resin 4 during the assembly operation and without impairing the appearance. An electric machine can be provided. In addition, about the extension part 2f, although FIG. 3 showed about the case where the extension part extended in the circumferential direction from the center vicinity of the radial direction of the other circumferential direction side surface 2d of the recessed part 2a was shown, it is limited to this case. Instead, the extending portion only needs to cover the outer periphery of the contact surface 2e between the other circumferential side surface 2d of the recess 2a and the yoke 1 and extend in the circumferential direction from the other circumferential side surface 2d. Since the contact surface 2e is located on the flange 1b side (inner diameter side) of the other circumferential side surface of the recess, for example, it extends in the circumferential direction from the outer diameter side of the other circumferential side surface of the recess. You may provide an extension part in this.

  In the first embodiment of the present invention, the sealing resin 4 leaking from the contact surface 2e is accumulated in the extending portion 2f provided on the other circumferential side surface 2d of the recess 2a of the housing 2. Although the case where it is in the shape of a saucer has been shown, the present invention is not limited to this, and any configuration that covers the outer periphery of the contact surface between the other circumferential side surface 2d of the housing 2 and the yoke 1 can be used. An L-shaped extension projecting in the circumferential direction from the inner diameter side of the circumferential side surface 2d of the housing 2 and extending toward the yoke 1 side in the axial direction so as to cover the outer periphery of the contact surface between the other circumferential side surface 2d of the housing 2 and the yoke 1 You may make it provide a protrusion part. In this case, the sealing resin 4 leaks from the contact surface 2e to the outside of the motor 100. Like the tray of the extending portion 2f shown in the first embodiment of the present invention, the leaking sealing resin 4 is Since it is stored in the gap formed by the other circumferential side surface 2d of the housing 2 and the L-shaped extending portion, the adhesion of the sealing resin 4 during assembly work is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

Conventionally, it can be confirmed that the sealing resin leaks from the contact surface between the yoke and the housing, so that the yoke and the housing are securely sealed. By looking at the portion 2f from the side of the yoke 1 in the axial direction, it can be confirmed that the sealing resin 4 has leaked into the extending portion 2f. Therefore, regardless of the presence or absence of the extending portion 2f, the yoke 1 and the housing 2 Can be confirmed to be securely sealed. 3 is formed so as to extend in the circumferential direction, the operator touches the extension 2f from the side of the yoke 1 in the axial direction, so that the contact is made during the assembly work. As shown in FIG. 4, the sealing resin 4 leaking from the surface 2e may adhere to the outer periphery of the flange 1b of the yoke 1 so as to cover the yoke 1 side end surface of the extending portion 2f. By providing the projecting portion 1d projecting from the projecting portion, the projecting portion 1d serves as a cover for the extending portion 2f, so that the projecting portion 2f is not touched from the axial direction. The adhesion of the resin 4 for use is further reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

  Further, according to the first embodiment of the present invention, as shown in FIG. 3, the end face on the yoke 1 side of the grommet 3 is recessed outward in the radial direction from the contact face 3c filled with the sealing resin 4. Since the recess 3d is provided, the flange 1b is brought into contact with the contact surface 3c of the grommet 3 in a state where the grommet 3 is attached to the housing 2 and the sealing resin 4 is filled in the contact surface 3c. When the yoke 1 is attached, the sealing resin 4 leaks from the contact surface 3c to the outside of the motor 100. Since the leaked sealing resin 4 flows into the recess 3d, the sealing resin 4 is sealed during assembly. The adhesion of the resin 4 is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance. Further, since the radially inner side of the recess 3d is covered with the flange 1b, if the sealing resin 4 leaked to the outside of the motor 100 from the contact surface 3c of the grommet 3 is small, the leaked sealing resin 4 As such, since it accumulates in the space formed by the flange 1b and the recess 3d, it is possible to provide a rotating electrical machine that does not further impair the appearance. If there is a relatively large amount of sealing resin 4 leaking out of the motor 100 from the contact surface 3c of the grommet 3 due to variations in the filling amount of the sealing resin 4, the leaked sealing resin 4 is Since the concave portion 3d is accumulated in the radially outer portion of the flange 1b and the concave portion 3d is viewed from the axial yoke 1 side, it can be confirmed that the sealing resin 4 is accumulated in the concave portion 3d. It can be confirmed that the grommet 3 and the grommet 3 are securely sealed.

  In FIG. 3, a recess 3 d is provided that is recessed radially outward from the contact surface 3 c of the grommet 3, and a part of the recess 3 d is covered by the flange 1 b on the radially inner side of the flange 1 b and remains. However, the present invention is not limited to this case, and a recess that is recessed outward in the radial direction from the contact surface 3c filled with the sealing resin 4 is provided. Any configuration may be used, and the entire recess 3d1 may be provided so as to be positioned radially outward from the flange 1b (see FIG. 5), or the entire recess 3d2 may be positioned radially inward from the flange 1b. The structure (refer FIG. 6) covered with the flange 1b may be sufficient. As shown in FIG. 5, in the case where the entire recess 3d1 is provided so as to be positioned radially outside of the flange 1b, the leaked sealing resin 4 accumulates in the recess 3d1, and the recess 3d1 is axially disposed. By looking from the side of the yoke 1, it can be confirmed that the sealing resin 4 is accumulated in the recess 3 d 1, and therefore it can be confirmed that the yoke 1 and the grommet 3 are securely sealed. As shown in FIG. 6, when the entire recess 3d2 is positioned radially inward of the flange 1b and the entire recess 3d2 is covered by the flange 1b, the sealing resin 4 itself that will leak out is Since it reliably accumulates in the space formed by 1b and the recess 3d2, it is possible to provide a rotating electrical machine that does not further impair the appearance.

  In the first embodiment of the present invention, the end face of the grommet 3 on the yoke 1 side is provided with a recess 3d that is recessed radially outward from the contact surface 3c filled with the sealing resin 4. Although not limited to this case, as shown in FIG. 7, a convex portion 3e extending in the axial direction is provided on the outer side of the flange 1b provided on the outer periphery of the opening end of the yoke 1 and extending in the axial direction. May be. In this case, the sealing resin 4 leaks from the contact surface 3c to the outside of the motor 100, but the leaked sealing resin 4 is stored in a gap formed by the yoke 1 side end surface of the grommet 3 and the convex portion 3e. Therefore, the adhesion of the sealing resin 4 during the assembly operation is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

Embodiment 2. FIG.
In the first embodiment, the case where the housing 2 is provided with the rib portion (extending portion 2f) covering the outer periphery of the contact surface between the other circumferential side surface 2d of the housing 2 and the yoke 1 has been described. On the other hand, in the second embodiment, a case where the grommet 13 is provided with a portion corresponding to the extending portion 2f in the first embodiment will be described with reference to FIGS. FIG. 8 is an exploded perspective view of the motor 200 according to Embodiment 2 of the present invention, and FIG. 9 is an enlarged view of the vicinity of the grommet 13.

  In FIG. 8, a motor 200 that is a rotating electrical machine has a cylindrical yoke 1 that is open at one end and provided with a flange 1b on the outer periphery of the open end 1a, and a housing that is in contact with the flange 1b and fastened to the yoke 1. 12 and a grommet 13 through which a connecting wire 5 such as a lead wire led out from the main body of the motor 200 accommodated in the housing 12 passes. A plurality of through holes 1c through which screws 6 (fastening members) penetrate in the axial direction are formed in the flange 1b. Further, the flange 1 b is in contact with the contact surface 12 e of the housing 12.

  On the outer periphery of the housing 12 on the yoke 1 side, there is formed a recess 12a that opens in two directions, the radially outer side of the housing 12 and the yoke 1 side, and one circumferential side surface 12c (left side in FIG. 8) of the recess 12a. ) Has a screw 6a (fastening member). A plurality of fastening holes 12b to which the screws 6 are fastened are formed at positions corresponding to the through holes 1c formed in the flange 1b when the yoke 1 and the housing 12 are fastened.

The grommet 13 is made of an insulating material having elasticity such as rubber and is integrally formed with the O-ring portion 13a as shown in FIG. The O-ring portion 13a is disposed radially inward of the end face of the housing 12 on the yoke 1 side. When the yoke 1 is placed on the housing 12 and the flange 1b is brought into contact with the housing 12, the O-ring 13a is pressed. As a result, the yoke 1 and the housing 12 are sealed.
Further, the grommet 13 is attached to the housing 12 by fitting in a compressed state in the recess 12 a of the housing 12. The grommet 13 is formed with a plurality of (two in the illustrated example) through-holes 13b through which the connection lines 5 penetrate, and the connection lines 5 are drawn out of the motor 200 through the through-holes 13b.
In addition, a contact surface 13c that contacts the flange 1b is formed on the end surface of the grommet 13 on the yoke 1 side, and radially inward of this contact surface 13c (in the illustrated example, in the vicinity of the O-ring 13a). The sealing resin 4 is filled, and the contact surface 13c is sealed by the flange 1b and the grommet 13 contacting each other. A recess 13d that is recessed radially outward from the contact surface 13c is provided on the end surface of the grommet 13 on the yoke 1 side and radially outward from the contact surface 13c. In the recess 13d, the sealing resin 4 leaking from the contact surface 13c between the flange 1b and the grommet 13 is accumulated, as in the recess 3d shown in FIG.

  Furthermore, it is a circumferential side surface of the grommet 13 and is a circumferential side surface that is fitted to the other circumferential side surface 12d of the recess 12a of the housing 12, that is, the other circumferential side surface 13f of the grommet 13 (right side in FIG. 9). ) Is provided with a saucer-like extending portion 13g (rib portion) in which the sealing resin 4 leaking out of the motor 200 from the contact surface 12e between the housing 12 and the flange 1b is accumulated (see FIG. 9). . The extending portion 13 g extends in the circumferential direction from the other circumferential side surface 13 f of the grommet 13 and is formed integrally with the grommet 13. Although FIG. 9 shows a case where the sealing resin 4 leaking from the contact surface 12e is collected in the extending portion 13g, the shape is not limited to this case, and the recess 12a of the housing 12 is not limited thereto. The outer circumferential side surface 12d of the yoke 1 and the flange 1b of the yoke 1 only need to cover the outer periphery of the contact surface 12e, cover the outer periphery of the contact surface 12e, and there is no bottom portion of the tray, It may have a shape penetrating in the axial direction.

  As described above, the motor 200 (rotary electric machine) according to the second embodiment of the present invention is in contact with the flange 1b and the cylindrical yoke 1 having one end opened and the flange 1b provided on the outer periphery of the open end. The housing 12 is fastened to the yoke 1 by screws 6 (fastening members), and is fitted into the recess 12a with a housing 12 having recesses 12a that are open radially outward and on the yoke 1 side on the outer periphery on the yoke 1 side. Thus, the grommet 13 attached to the housing 12 and the sealing resin 4 filled in the contact surface 13c between the flange 1b and the grommet 13 are provided, and one circumferential side surface 12c of the recess 12a (the left side in FIG. 9). ), The screw 6a is located, and the other circumferential side surface 12d (right side in FIG. 9) of the recess 12a is provided with an extending portion 13g (rib portion) covering the outer periphery of the contact surface 12e with the yoke 1. Since the grommet 13 is attached to the housing 12 and the contact surface 13c between the flange 1b and the grommet 13 is filled with the sealing resin 4, the yoke 1 is placed on the housing 12, and the flange 1b is brought into contact with the contact surface 13c of the housing 12 and the grommet 13 and fastened with screws 6, so that the sealing resin 4 is attached to the end surface (contact surface of the grommet 13) when the yoke 1 is attached to the housing 12. 13c) A portion of the sealing resin 4 leaks to the outside of the motor 200 from the contact surface 12e, and the leaked sealing resin 4 is covered by the extending portion 13g. Therefore, the adhesion of the sealing resin 4 during the assembly operation is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

  Here, when the contact surface 13 c of the grommet 13 is filled with the sealing resin 4, the yoke 1 is placed on the housing 12, and the flange 1 b just contacts the contact surface 13 c of the grommet 13. In this case, the sealing resin 4 flows out uniformly in the radial direction or the circumferential direction without being biased to the specific radial position or the specific circumferential position. The extending portion 13g that covers the outer periphery of the contact surface 12e between the other circumferential side surface 12d of 12a and the yoke 1 is opposite to one circumferential side surface 12c of the recess 12a where the screw 6a that is the fastening member is located. Therefore, the fastening force of the screw 6a acts by being fastened by the screw 6a. As a result, as in the case of the first embodiment, the large amount of the sealing resin 4 filled in the contact surface 13c. The part is tightened with screws 6a The sealing resin 4 that has flowed from the (one) circumferential side surface 12c of the recessed portion 12a to the opposite side (the other) circumferential side surface 12d and leaked from the contact surface 12e is Since it is covered with the extending portion 13g provided on the (other) circumferential side surface 12d, most of the sealing resin 4 leaking out of the motor 100 can be reliably covered.

  In the first embodiment of the present invention, the extension 2f covering the outer periphery of the contact surface 2e is formed integrally with the housing 2, and the shape of the housing 2 and the position of the fastening hole 2b are determined for each motor specification. However, according to the second embodiment of the present invention, the extension covering the outer periphery of the contact surface 12e is a concern because the mold change for each mold is necessary, and there is a concern about cost increase. Since the portion 13g is integrally formed with the grommet 13, even if the shape of the housing 12 and the position of the fastening hole 12b are different for each motor specification, only the shape of the grommet 13 is changed for each motor. Since the common grommet 13 can be used, an increase in cost can be suppressed and a plurality of motor specifications can be handled.

  In the second embodiment of the present invention, the sealing resin 4 leaking from the contact surface 12e is accumulated in the extending portion 13g extending in the circumferential direction from the other circumferential side surface 13f of the grommet 13. Although the case where it is in the shape of a saucer has been shown, the present invention is not limited to this, and any configuration that covers the outer periphery of the contact surface between the other circumferential side surface 12d of the housing 12 and the yoke 1 can be used. An extending portion extending in the circumferential direction along the housing 12 is provided from the inner diameter side of the circumferential side surface 13f of the housing 12, and the extending portion is in contact with the other circumferential side surface 12d of the housing 12 and the yoke 1. A convex portion extending toward the yoke 1 in the axial direction may be formed so as to cover the outer periphery of the surface. In this case, the sealing resin 4 leaks from the contact surface 12e to the outside of the motor 200. Like the tray of the extending portion 13g shown in the second embodiment of the present invention, the leaking sealing resin 4 is Since it is stored in the gap formed by the other circumferential side surface 12d of the housing 12 and the extending part and the convex part of the grommet 13, the adhesion of the sealing resin 4 during assembly work is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

Conventionally, it can be confirmed that the sealing resin leaks from the contact surface between the yoke and the housing, so that the yoke and the housing are securely sealed. By looking at the portion 13g from the side of the yoke 1 in the axial direction, it can be confirmed that the sealing resin 4 has leaked into the extending portion 13g. Therefore, regardless of the presence or absence of the extending portion 13g, the yoke 1 and the housing 12 Can be confirmed to be securely sealed.

  Further, according to the second embodiment of the present invention, as shown in FIG. 9, the end face on the yoke 1 side of the grommet 13 is recessed outward in the radial direction from the contact face 13 c filled with the sealing resin 4. Since the recess 13d is provided, the flange 1b is brought into contact with the contact surface 13c of the grommet 13 in a state where the grommet 13 is attached to the housing 12 and the sealing resin 4 is filled in the contact surface 13c. When the yoke 1 is attached, the sealing resin 4 leaks from the contact surface 13c to the outside of the motor 200. Since the leaked sealing resin 4 flows into the recess 13d, the sealing resin 4 is sealed during assembly. The adhesion of the resin 4 is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance. Further, since the inner side in the radial direction of the recess 13d is covered with the flange 1b, if the sealing resin 4 leaked to the outside of the motor 200 from the contact surface 13c of the grommet 13 is small, the leaked sealing resin 4 As such, since it accumulates in the space formed by the flange 1b and the recess 13d, it is possible to provide a rotating electrical machine that does not further impair the appearance. If the sealing resin 4 leaked to the outside of the motor 200 from the contact surface 13c of the grommet 13 due to a variation in the filling amount of the sealing resin 4 or the like, the leaked sealing resin 4 is Since the concave portion 13d is accumulated in the radially outer portion of the flange 1b and the concave portion 13d is viewed from the axial yoke 1 side, it can be confirmed that the sealing resin 4 is accumulated in the concave portion 13d. It can be confirmed that the grommet 13 and the grommet 13 are securely sealed.

  In the first embodiment of the present invention, the housing 2 is provided on the rib portions provided on the other circumferential side surfaces 2d and 12d of the recesses 2a and 12a of the housings 2 and 12 and covering the outer periphery of the contact surface with the yoke 1. In the embodiment 2 of the present invention, the other side of the recess 12a is shown as the extension portion 2f extending in the circumferential direction from the other circumferential side surface 2d of the recess 2a. Although the case of the extending portion 13g extending in the circumferential direction from the other circumferential side surface 13f, which is the side fitted to the circumferential side surface 12d, is shown, the present invention is not limited to these cases, and protrudes radially outward from the yoke 1. An L-shaped rib portion extending toward the housing 2 in the axial direction may be provided so as to cover the outer periphery of the contact surface between the (other) circumferential side surface 2d of the housing 2 and the yoke 1. Even in this case, since the sealing resin 4 leaking out of the motor is covered with the rib portion, the adhesion of the sealing resin 4 during the assembly operation is reduced. Further, since the leaked sealing resin 4 does not adhere to other parts, it is possible to provide a rotating electrical machine that does not impair the appearance.

  In Embodiments 1 and 2 of the present invention, the general motor 100 has been described as the rotating electrical machine. However, the present invention is not limited to this motor, and other rotating electrical machines such as a brushed motor, a brushless motor, and an alternator may be used. May be.

  1: Yoke, 1a: Open end, 1b: Flange, 1c: Through hole, 1d: Projection part, 2, 12: Housing, 2a, 12a: Recess, 2b, 2b1: Fastening hole, 2c, 2d, 12c, 12d: Circumferential side surface, 2e, 12e: contact surface, 2f: extended portion (rib portion), 3, 13: grommet, 3c, 13c: contact surface, 3d, 3d1, 3d2, 13d: concave portion, 3e: convex portion 4: Sealing resin, 6, 6a: Screw (fastening member), 13f: Side surface in the circumferential direction, 13g: Extension part (rib part), 100, 200: Motor (rotary electric machine).

Claims (6)

A cylindrical yoke having one end open and a flange on the outer periphery of the open end;
A housing that is in contact with the flange and is fastened to the yoke by a fastening member, and has a recess that is open radially outward and on the yoke side on the yoke-side outer periphery;
A grommet attached to the housing by being fitted in the recess;
A sealing resin filled in a contact surface between the flange and the grommet;
With
The fastening member is positioned on one circumferential side surface of the recess, and a rib portion is provided on the other circumferential side surface of the recess to cover the outer periphery of the contact surface with the yoke. Rotating electric machine.   The rotating electrical machine according to claim 1, wherein the rib portion is an extending portion that extends in the circumferential direction from the other circumferential side surface of the recess.   The rib portion is an extending portion that extends in a circumferential direction from a circumferential side surface that is fitted to the other circumferential side surface of the recess among the circumferential side surfaces of the grommet. Rotating electric machine.   4. The recessed portion that is recessed radially outward from the contact surface with the flange of the yoke is provided on the end surface of the grommet on the yoke side. 5. The rotating electrical machine described in 1.   4. A projecting portion extending in an axial direction is provided on a yoke side end face of the grommet, which is located radially outside the outer periphery of the opening end of the yoke. The rotating electrical machine according to any one of claims.   6. A protruding portion that protrudes radially outward is formed on an outer periphery of the flange of the yoke so as to cover the yoke-side end surface of the rib portion. The rotating electrical machine described in 1.

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