JPH0677456U - Sealing structure of rotating electric machine - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Even if the end bracket has a notch, the seal member ensures the sealability of the mating surface between the yoke and the end bracket. A ring-shaped accommodating groove 34 is recessed on the mating surface side of the flange portion 32 of the mating surface of the flange portion 32 of the end bracket 13 and the flange portion bent and formed at one end opening of the yoke. Square ring 3 in groove 34
7 is attached. The square ring 37 includes a main body 38 having substantially the same shape as the housing groove 34, and a plurality of protrusions 39. The protrusions 39 are brought into contact with the male seal cage coupling portion 29 to restrict the radial movement of the square ring 37. . [Effect] Since the square ring 37 is arranged at the designated position in the housing groove 34 by the contact of the projection 39 with the male indigo cage coupling portion 29, the square ring 37 can avoid the interference of the cutout portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal structure of a rotary electric machine, and more particularly to improvement of a seal structure at a mating surface of a yoke and an end bracket which form a housing. For example, the seal structure of the motor is used as an electric component mounted on a vehicle. Regarding valid ones.

[0002]

[Prior art]

 BACKGROUND ART A conventional automobile electric component motor (hereinafter referred to as a motor) has a cylindrical yoke having a flange portion projecting outward in the radial direction at an opening at one end, and an opening at a flange portion of the yoke. And an end bracket that is incline-coupled so that the rotor is rotatably supported at both ends of its shaft by one end of the yoke and the end bracket. Some of them are configured to drive a worm gear speed reduction mechanism installed in a physically connected gear box.

In this motor, it is necessary to secure a sealed state between the mating surfaces of the yoke and the end bracket that substantially constitute the motor housing. Therefore, in the conventional motor, an O-ring or a square ring as a sealing member is sandwiched between the mating surfaces of the yoke and the end bracket.

When a square ring is used as a seal member in such a motor, the width of the square ring is set so that the tightening margin of the square ring is secured and the filling rate is set to 100% or less. It is used that is set smaller than the width of the groove.

[0005]

[Problems to be solved by the device]

 However, in the conventional seal structure for rotating electrical machines that uses square rings, the following problems occur when the end bracket has cutouts for insulation or cutouts such as air vents. .

If the inner diameter of the square ring is made small, the centering can be secured, but the square ring is in a state of being caught in the cutout portion, so that it may not be possible to sufficiently secure the sealing property.

If the inner diameter of the square ring is set large in order to avoid contact with the yoke-side flange portion, it becomes impossible to ensure radial regulation, so that the square ring is centered with respect to the square ring mounting groove. Is impossible, and the square ring protrudes from the square ring mounting groove, making it impossible to secure the sealing performance.

An object of the present invention is to provide a seal structure for a rotary electric machine, which can ensure the sealing property between the mating surfaces of the yoke and the end bracket even when the end bracket has a cutout portion. is there.

[0009]

[Means for Solving the Problems]

 The seal structure for a rotary electric machine according to the present invention comprises a cylindrically-shaped yoke, one end opening of which is bent and formed so as to project outward in the radial direction, and an opening of this yoke. A seal structure for a rotary electric machine, wherein a seal member is sandwiched between a mating surface with a flange part integrally formed so as to project outward in the radial direction on an end bracket to which the joint part is joined in a seal. A seal member accommodating groove is formed in the mating surface of the bracket-side flange portion in a ring shape having a width that extends from the base end of the outer peripheral surface of the male cage joint to the convex curved portion of the yoke-side flange portion. The sealing member has a main body formed in a substantially same shape as the housing groove, and a plurality of protrusions that are spaced apart from each other inside the main body and project toward the male seal cage coupling portion. The sealing member with the body portion is accommodated in the accommodation groove, wherein the protrusion is restricted movement in the radial direction due to contact with the male spigot coupling portion.

[0010]

[Action]

 According to the above-mentioned means, the seal member accommodated in the seal member accommodating groove is prevented from moving in the radial direction by the protrusion contacting with the male seal cage joint portion. Even if a notch for insulation or a notch such as air vent is opened, it is possible to prevent the sealing member from being caught in the notch, so that the sealing property between the mating surface between the yoke and the end bracket is good. Can be secured sufficiently.

[0011]

【Example】

 FIG. 1 is a plan view showing an automobile electric component motor adopting a seal structure of a rotary electric machine according to an embodiment of the present invention, in which a yoke is removed, and FIG. 2 is a side sectional view taken along line II-II of FIG. Is.

In the present embodiment, the seal structure of the rotary electric machine according to the present invention is configured as a seal structure of a motor vehicle electrical component motor, and the motor 10 as the rotary electric machine includes a housing 11. The housing 11 is composed of a yoke 12 formed in a substantially cylindrical shape with one end surface opened and the other end closed, and an end bracket 13 mounted on the opening side of the yoke 12.

Bearing members 15 and 16 are arranged in the central portions of the closing wall 14 of the yoke 12 and the end bracket 13, respectively. A rotor shaft 17 is installed in the housing 11 in a centerline shape, and the rotor shaft 17 is rotatably supported by both bearing members 15 and 16.

An armature 18 is fixedly mounted on the rotor shaft 17 in an intermediate portion, and the armature 18 is provided on the inner peripheral surface of the yoke 12 at a substantially equal interval in the circumferential direction. It is arranged so as to face the gunet 19. A commutator 20 for supplying electric power to the armature 18 is fixedly mounted on the rotor shaft 17 at an end portion on the end bracket 13 side.

A recess 21 for accommodating the brush holder stay is recessed in the end face of the end bracket 13 on the yoke side to a certain depth in the axial direction, and a brush holder stay 22 is arranged in the recess 21. There is. The brush holder stay 22 is integrally formed into a disc shape by using Bakelite, is arranged concentrically with the commutator 20, and is fixed to the end bracket 13. A plurality of brush holders 23 each having a substantially square tubular shape are radially arranged and fixed to the brush holder stay 22. A brush 25 having a pigtail 24 is slidably accommodated in each brush holder 23 so as to be in sliding contact with the outer peripheral surface of the commutator 20.

A mounting hole 26 for mounting a grommet is formed on the outer peripheral portion of the end bracket 13 so as to penetrate radially inward and outward from the side wall portion of the end bracket 13 to the closed portion. The grommet 28 having the lead wire 27 inserted therein is inserted and fixed.

On the opening edge of the accommodation recess 21 in the end bracket 13, a male cage connecting portion 29 is formed in a circular ring shape so as to project toward the yoke side in the axial direction. The inner periphery of the yoke 12 is joined to the outer periphery of the ingot. A notch 30 is cut at a position facing the grommet mounting hole 26 in the male ingot joint portion 29, and the lead wire 27 is inserted into the notch portion 30 when the end bracket 13 and the yoke 12 are coupled. Is wired to the brush holder stay 22 side.

In the present embodiment, the flange portion 31 is integrally bent and formed in the opening portion of the yoke 12 so as to project outward in the radial direction by deep drawing, and the screw portion is inserted into the flange portion 31. At least one pair of holes (not shown) are provided at intervals in the circumferential direction. Incidentally, a convex curved portion R is naturally formed at the bent portion of the flange portion 31.

On the other hand, a flange portion 32 is arranged on the outer periphery of the end bracket 13 so as to be in contact with the male cage joint portion 29, and is integrally formed so as to project outward in the radial direction. Is formed by arranging a plurality of female screw holes 33 so as to face the respective screw insertion holes of the yoke side flange portion 31.

An accommodation groove 34 for accommodating a square ring as a seal member is formed in the end face of the end bracket side flange portion 32 on the side of the male cage connection portion 29 and is formed in a circular ring shape having a rectangular cross section. It is set up. That is, the accommodation groove 34 is formed as a circular annular groove having a constant width and a constant depth, and its inner rising wall surface is located on the extension line of the outer peripheral surface of the male-in cage joint portion 29 and its outer rising wall surface is It is formed so as to be located on a flat surface portion outside the convex curved portion R of the yoke side flange portion 31.

Further, a notch 35 for forming an air gap for insulation and a notch 36 for air venting and oil venting are circumferentially spaced from each other on the inner peripheral side of the accommodation groove 34. They are opened so that they can communicate with each other inside and outside the direction.

The square ring 37 as a seal member accommodated in the accommodation groove 34 is integrally molded using an elastic material such as rubber and has an inner diameter smaller than the inner diameter of the accommodation groove 34, and A main body portion 38, which is formed in a circular ring shape having an outer diameter slightly smaller than the housing groove 34, and an inner peripheral surface of the main body portion 38, which are spaced apart from each other in the circumferential direction, are connected to the male seal cage coupling portion 29 side. And a plurality of protrusions 39 protruding outward in the direction.

Each of the protrusions 39 is formed in a plate shape having a substantially semicircular shape in plan view, and is arranged so that the circumferential side faces the inner side in the radial direction. Then, the projections 39 come into contact with the male seal cage connection portion 29, whereby the radial movement of the square ring 37 is restricted.

Next, the operation will be described. When the motor 10 having the above-described structure is assembled, first, the unit of each component is assembled. In this case, the bearing member 15 and the magnet 19 are assembled to the yoke 12, the lead wire 27 is inserted into the grommet 28, and the brush holder stay 22 and the pigtail 24 are connected to one end of the lead wire 27. A coupler or the like (not shown) is connected to the other end. Then, the bearing member 16, the oil seal ring and the like are assembled to the end bracket 13, and the square ring 37 is laid in the accommodation groove 34.

When the square ring 37 is laid in the receiving groove 34, the square ring 37 can be inserted into the receiving groove 34 by being guided by the outer peripheral surface of the male cage connecting portion 29 of the end bracket 13. 37 can be arranged at an appropriate position in the accommodation groove 34 in the radial direction. Further, since the main body portion 38 of the square ring 37 is formed in the shape of a ring having a rectangular cross section having a width in the radial direction, the square ring 37 is twisted when arranged at an appropriate position in the accommodation groove 34. It will be laid in a proper posture without being damaged. That is, the square ring 37 maintains a proper laid state in the accommodation groove 34.

When the square ring 37 is inserted into the accommodation groove 34, the square ring 37 has a circular ring shape whose outer diameter is slightly smaller than the outer diameter of the accommodation groove 34. A slight gap is formed outside the ring 37.

Further, since the inner diameter of the square ring 37 is formed to be smaller than the inner diameter of the accommodation groove 34 by a dimension corresponding to the width of the protrusion 39, the inside of the accommodation groove 34 is smaller than the inside of the square ring 37. A large gap is formed. However, since the protrusions 39 of the square ring 37 are circumscribing the male-in cage joint portion 29, the square ring 37 is aligned with the accommodation groove 34. That is, it has a constant width in the circumferential direction in the large gap.

After that, the unitized parts are assembled in a motor assembly line. That is, the brush holder stay 22 and the grommet 28 are assembled to the end bracket 13, and the rotor shaft 17 is inserted. Subsequently, the yoke 12 is relatively inserted into the rotor shaft 17 and fitted into the male seal cage coupling portion 29 of the end bracket 13.

Next, a screw is inserted into the screw insertion hole of the yoke 12 and screwed into the female screw hole 33 of the end bracket 13, so that the yoke 12 and the end bracket 13 are fastened and integrated.

By fastening the yoke 12 and the end bracket 13, the square ring 37 is sandwiched between the mating surfaces of the flange portions 31 and 32 of the two. In this state, since the protrusions 39 of the square ring 37 are in contact with the outer peripheral surface of the male seal cage coupling portion 29, the movement of the square ring 37 in the radial direction is restricted, and the square ring 37 is restricted. 37 is arranged at the outer peripheral position of the accommodation groove 34. Therefore, the square ring 37 is prevented from protruding from the accommodation groove 34, and the square ring 37 is prevented from being caught in the notches 35 and 36. Therefore, even if the cutouts 35 and 36 are formed in the accommodation groove 34 of the end bracket 13, the square ring 37 can ensure the sealing property while avoiding the cutouts 35 and 36.

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

For example, in the above-described embodiment, the case where the five protrusions 39 are disposed on the main body 38 and each protrusion 39 contacts the outer peripheral surface of the male seal cage coupling portion 29 has been described. If at least four of the projections 39 are in contact with the male indigo cage coupling portion 29, the radial movement of the square ring 39 can be restricted.

Further, if the six protrusions 39 are arranged at equal intervals, even if the two protrusions are located at the cutouts 35 and 36, the remaining four protrusions 39 and the male seal cage joint portion 29. If in contact, the radial movement of the square ring 37 can be restricted.

[0034]

[Effect of device]

 As described above, according to the present invention, a plurality of protrusions are formed on the inside of the seal member, and the protrusions are brought into contact with the male seal cage joint to control the radial movement of the seal member. With this configuration, even when the end bracket has a notch, the seal member can sufficiently secure the sealing property between the mating surfaces of the end bracket and the yoke.

[Brief description of drawings]

FIG. 1 is a plan view of a motor vehicle electrical component motor in which a seal structure of a rotary electric machine according to an embodiment of the present invention is adopted, with a yoke removed.

FIG. 2 is a side sectional view taken along the line II-II in FIG.

[Explanation of symbols]

10 ... Motor (rotary electric machine), 11 ... Housing, 12 ...
Yoke, 13 ... End bracket, 14 ... Closure wall, 1
5, 16 ... Bearing member, 17 ... Rotor shaft, 18 ... Armature, 19 ... Magnet, 20 ... Commitator, 21 ... Recess, 22 ... Brush holder stay, 23 ... Brush holder,
24 ... Pigtail, 25 ... Brush, 26 ... Mounting hole,
27 ... Lead wire, 28 ... Grommet, 29 ... Male cage combination part, 30 ... Notch part, 31, 32 ... Flange part, 33 ... Female screw hole, 34 ... Housing groove, 35, 36 ... Notch part, 37 ... Square ring, 38 ... Body part, 39 ... Protrusion, 40 ... Coupler.

Claims (1)

[Scope of utility model registration request] 1. A flange portion, which is bent and formed so as to project outward in the radial direction, at one end opening of a yoke formed in a tubular shape, and a male seal cage coupling portion is coupled to the opening of this yoke. In a seal structure of a rotary electric machine in which a seal member is sandwiched between a mating surface with a flange portion integrally formed with the end bracket so as to project outward in the radial direction, the end bracket side flange portion has a mating surface. The seal member accommodating groove is recessed in a ring shape having a width in a range from the outer peripheral surface base end of the male inro cage coupling portion to the convex curved portion of the yoke side flange portion, and the seal member is formed in the accommodating groove And a plurality of protrusions that are spaced apart from each other and project toward the male seal cage coupling portion, and the sealing member is provided in the accommodation groove. Seal structure of a rotating electric machine together with the main body portion is accommodated, characterized in that the projection is regulated contact movement in the radial direction by the male spigot coupling portion.