JP2010136596A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor superior in work and waterproof properties by simply and adequately mounting an O-ring or the like which has been difficult to mount conventionally. <P>SOLUTION: A waterproof structure of the motor is realized by attaching mounting a holder 6 to an opening 21 of a bracket 2 wherein a stator 44 and a rotor 42 are stored. A first opening 21a with a small diameter and a second opening 21b with a large diameter are provided in the opening 21 in order from the inside. The holder 6 has a fitting portion 64 to fit the holder to the opening 21 and a small diameter step 73 formed in a smaller diameter is formed at the tip side of the holder. The O-ring 16 is arranged between the small diameter step 73 and the first opening 21a and is press-fixed to the outside surface of the small diameter step 73 and to the inside surface of the first opening 21a. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a motor, and more particularly to a waterproof structure thereof.

  Conventionally, in order to ensure the waterproofness of a motor, an O-ring or the like is interposed between motor components and sealed in a watertight manner (Japanese Utility Model Laid-Open No. 7-30564, Japanese Patent Laid-Open No. 2002). -345211).

  For example, Japanese Utility Model Publication No. 7-30564 discloses a motor in which a fitting portion of a holder base is fitted into an opening portion of a bottomed cylindrical motor yoke. A water-proof property between the motor yoke and the holder base is secured by interposing an O-ring between the inner surface and the inner surface.

A groove is formed on the outer surface of the fitting portion, and a holder base having an O-ring fitted in the groove is fitted in the motor yoke.
Japanese Utility Model Publication No. 7-30564 Japanese Patent Laid-Open No. 2002-345211

  However, the elastic member for sealing, such as an O-ring used in such a motor, is relatively difficult to handle because it has a relatively large diameter and needs to be press-fitted at the time of mounting. is there. If the elastic member does not fit well and is bitten, waterproofness may not be secured.

  An object of the present invention is to provide a waterproof structure for a motor that is excellent in workability, can be appropriately fitted with an elastic member for sealing with high accuracy without being bitten, and has excellent waterproofness.

  To achieve the above object, the present invention provides a motor main body, a bracket in which the motor main body is housed in a housing chamber having an opening having a cylindrical opening at one end, and the bracket so as to close the opening. A first mounting portion and a second opening portion having an inner diameter larger than that of the first opening portion in order from the housing chamber side. An inclined surface portion having an inclined inner surface is provided between the first opening portion and the second opening portion in the opening portion, and the holder has a fitting portion fitted into the opening portion. And the fitting portion is fitted into the first fitting portion fitted into the first opening, the second fitting portion fitted into the second opening, and the inclined surface portion. An inclined fitting portion, and the first fitting portion includes a predetermined opening and a predetermined opening. A small-diameter step portion having an interval is formed, and a ring-shaped elastic member is disposed between the small-diameter step portion and the first opening, and the elastic member is connected to the outer surface of the small-diameter step portion and the first portion. It is characterized by being crimped to the inner surface of the opening.

  According to such a configuration, the opening of the bracket is formed in a two-step tapered shape from the opening side of the first opening portion having a small diameter and the second opening portion having a large diameter, and the fitting portion of the holder is provided there. It is inserted. The first fitting portion of the holder that fits into the first opening is formed with a small-diameter step portion that is formed to have a small diameter. When the holder is fitted into the bracket, the holder is disposed there. A ring-shaped elastic member is crimped to the first opening of the bracket.

  Accordingly, when the fitting portion having the elastic member attached to the small-diameter step portion is inserted into the opening portion, the small-diameter step portion having a smaller diameter than the inner diameter of the first opening portion is the second opening portion having a larger diameter than the first opening portion. And once the small diameter step portion enters the first opening, the elastic member does not come off or fall off. In addition, the elastic member is arranged on the outer surface of the small-diameter step portion formed in the fitting portion so that it can move relatively freely. The biting of the member can be effectively suppressed.

  Furthermore, since an inclined surface portion having an inclined inner surface is provided between the first opening portion and the second opening portion in the opening portion, the elastic member is guided by the inclined surface portion and deformed in a balanced manner. It smoothly moves from the second opening to the first opening, and the elastic member can be effectively prevented from being bitten or distorted.

  Specifically, it is preferable that the length dimension of the small diameter step portion in the fitting direction is set to at least twice the diameter of the cross section of the elastic member.

  By doing so, it is possible to effectively prevent the elastic member from being detached when the elastic member is attached to the small-diameter step portion while securing the state in which the elastic member can freely move.

  Moreover, it is preferable that the length dimension of the said 1st fitting part and the inclination fitting part in a fitting direction is set smaller than the length dimension of the said 2nd opening part.

  Then, when the holder is fitted into the bracket, the second fitting portion is guided by the second opening portion, so that the small diameter step portion can be inserted into the first opening portion with the axial center aligned. it can.

  More specifically, the motor body has a cylindrical stator, and the bracket has a cylindrical side wall portion continuous with the opening, and the side wall portion circumscribes the stator to connect the stator. And the inner diameter of the first opening is larger than the inner diameter of the side wall, and a cylindrical stator housing hole that circumscribes the stator is formed at least on the tip side of the fitting part. It may be formed.

  Then, even if the stator housed in the bracket housing chamber is slightly misaligned in the fitting direction, it can be housed in the stator housing hole of the holder and fitted when the holder is fitted into the bracket. Since the tip end side of the portion, that is, the small diameter step portion is circumscribed by the stator and supported by the stator, the pressure bonding of the elastic member can be stably held.

  In order to position the holder, a large-diameter step portion having a large inner diameter dimension may be formed on the opening end side of the second opening portion.

  If it does so, since a holder can be positioned with high precision with respect to a bracket, the crimping state of an elastic member and a 1st opening part can be obtained stably, and waterproofness can be improved.

  In particular, the outer periphery of the portion of the holder opposite to the fitting portion is provided with a flat flat portion that is substantially orthogonal to the fitting direction, and is attached to the holder from the flat portion side so as to be integrated with the bracket. It is suitable when the sealing elastic member is crimped | bonded between the said cover member and the said plane part.

  Since the cover member joined integrally with the bracket is also positioned with high accuracy indirectly, the pressure-bonded state of the elastic member for sealing between the cover member and the flat surface can also be stably obtained, and is waterproof. It is because it can improve.

  In particular, since the crimping directions of the elastic members on the bracket side and the cover member side are substantially orthogonal and greatly deviated, even if the elastic members are deformed, they hardly affect each other, which is advantageous in terms of durability. It is.

  As described above, according to the present invention, an O-ring or the like that has conventionally been difficult to handle can be easily and appropriately mounted, and a motor excellent in workability and waterproofness can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a schematic cross-sectional view of a motor to which the waterproof structure of the present invention is applied. As shown in the figure, the motor includes a bracket 2, a motor body 4, a holder 6, a cover 8, and the like.

  As shown in FIG. 4, the bracket 2 is a pressed product of a steel plate having a bottomed cylindrical shape with one end opened. Specifically, the bracket 2 has an opening 21 that opens in a cylindrical shape, and a cylinder that continues to the opening 21. The side wall part 22 and the end wall part 23 which block | close the other end of this side wall part 22 are provided. At the center of the end wall portion 23, a two-stage cylindrical projecting wall portion 24 in which a small-diameter cylindrical wall and a large-diameter cylindrical wall continue in a step shape protrudes outward from the front end side. The tip of the protruding wall portion 24 is open. At the opening edge of the opening portion 21, a flange portion 25 is provided so as to protrude, and a recessed portion 26 that is lowered by one step is provided in order to support a base portion of a connector 62 of the holder 6 described later. The details of the opening 21 will be described later.

  The interior of the bracket 2 is a storage chamber 27 in which the motor body 4 composed of a shaft 41, a rotor 42, a stator 44, and the like is stored.

  The shaft 41 is made of an elongated cylindrical steel material and is disposed coaxially with the bracket 2. The rotor 42 is formed of a cylindrical member fixed coaxially with the shaft 41 at an intermediate portion in the axial direction of the shaft 41, and a plurality of positive electrodes and negative electrodes are alternately adjacent to the outer peripheral surface of the rotor 42. A magnet 43 is disposed over the entire circumference.

  The stator 44 is a composite member formed in a cylindrical shape by combining a plurality of members such as a core (iron core) 45, an insulator 46, and a winding 47. The stator 42 is separated from the outer peripheral surface of the rotor 42 by a slight gap. Is disposed coaxially with the shaft 41.

  Specifically, the core 45 has a cylindrical shape in which a plurality of teeth portions project radially from the inner peripheral surface toward the center, and includes a plurality of element cores having a substantially T-shaped cross section and made of a laminate of steel plates. It is formed by joining. A synthetic resin insulator 46 is attached to each tooth portion, and a plurality of electric wires are wound around each tooth portion via the insulator 46 to form a winding 47. For example, reference numeral 48 denotes a connection fitting to which one end of the winding 47 is connected, and the connection fitting 48 of this embodiment is arranged at three locations.

  The outer diameter of the stator 44 is slightly larger than or equal to the inner diameter of the side wall portion 22 of the bracket 2, and the stator 44 is accommodated in the accommodating chamber 27 by being inserted from the opening 21. The stator 44 is press-fitted into the bracket 2, and the outer peripheral surface of the stator 44 circumscribes the inner peripheral surface of the side wall portion 22 in the housing chamber 27 and is supported and fixed to the bracket 2.

  A ball bearing 10a is disposed inside the protruding wall portion 24 of the bracket 2, and the tip end side of the shaft 41 is rotatably supported by the ball bearing 10a. The tip portion of the shaft 41 protrudes from the ball bearing 10 a and faces the outside of the bracket 2. In FIG. 1, a split ring 49a for preventing the ball bearing 10a from coming off is attached to the shaft 41 above the ball bearing 10a.

  The holder 6 is an integrally molded plastic product having a shape as shown in FIGS. 2 and 3, and various electronic parts such as a bus bar 12, contacts, and IC are disposed inside and outside the holder 6. Specifically, the holder 6 includes a cup-shaped holder main body 61 and a connector 62 protruding radially outward from the holder main body 61. The holder main body 61 has a base portion 63 having a substantially disk shape and a thick disc shape, and a cylindrical fitting portion 64 protruding from one end edge of the base portion 63. Have. The holder 6 is attached to the bracket 2 in a watertight manner by fitting the fitting portion 64 into the opening 21 of the bracket 2. Details of the fitting portion 64 will be described later.

  A cylindrical bearing hole 65 is recessed from the inside at the center of the base portion 63, and the ball bearing 10 b is disposed inside the bearing hole 65. And the other end side of the shaft 41 is rotatably supported by this ball bearing 10b. A through hole 66 is formed in the center of the bottom of the bearing hole 65, and the base end surface of the shaft 41 faces the outside of the base part 63 from the through hole 66. A split ring 49b is attached to the shaft 41 below the ball bearing 10b.

  As shown in FIGS. 1 and 3, the base portion 63 is provided with a plurality of (three in this embodiment) bus bars 12 for connection to the connection fittings 48 protruding from the stator 44. The end of 12 protrudes into a window hole 68 formed through the bearing hole 65 at three locations. Each bus bar 12 is also connected to a pin 69 of the connector 62 so that a current is supplied via a cable (not shown) connected to the connector 62. That is, the holder 6 has both a function as a bearing of the shaft 41 and a function as a base of an electronic component.

  On the outer periphery of the portion of the base portion 63 opposite to the fitting portion 64 (also referred to as the top surface portion 70), a flat plane portion 71 substantially perpendicular to the axial direction of the shaft 41 is provided over the entire periphery. A concave portion 72 that is recessed in a belt shape is formed in the flat surface portion 71 over the entire circumference, and a seal packing 14 (elastic member) is disposed therein.

  The cover 8 is a press-formed product of a steel plate, and includes a top wall portion 81 that covers the top surface portion 70 of the holder 6, a peripheral wall portion 82 that covers the outer periphery of the base portion 63, and a peripheral wall portion. The cover 8 and the bracket 2 are integrally formed by joining the cover side flange portion 83 to the flange portion 25 of the bracket 2. It is connected to the.

  By the way, this motor is provided with a waterproof structure so that there is no problem even if it is exposed to rainwater or the like. However, in the motor according to the present embodiment, a driven member (not shown) that is waterproof is connected to the distal end side of the shaft 41, and thus the waterproof structure is not provided on the distal end side of the shaft 41. A waterproof structure is provided between the covers 8 and between the holder 6 and the bracket 2.

  First, between the holder 6 and the cover 8, waterproofness is ensured by the packing 14 disposed between the top wall portion 81 of the cover 8 and the flat portion 71 of the holder 6 being crimped thereto. .

  And between the holder 6 and the bracket 2, an O-ring 16 (elastic member) is disposed between the fitting portion 64 of the holder 6 and the opening 21 of the bracket 2, and the O-ring 16 is attached to these. Waterproofing is ensured by crimping.

  Specifically, the O-ring 16 is a relatively large-diameter elastic member obtained by processing an elongated silicon rubber having a round cross section into a ring shape. In the opening 21 of the bracket 2, a first opening 21 a having an inner diameter larger than that of the side wall portion 22 and a second opening 21 b having an inner diameter larger than that of the first opening 21 a are sequentially provided from the inside of the accommodation chamber 27. In addition, an inclined surface portion 21c having an inclined inner peripheral surface is provided between the first opening portion 21a and the second opening portion 21b (see FIG. 5).

  On the other hand, the fitting portion 64 of the holder 6 fitted into the opening portion 21 of the bracket 2 is set to have an outer diameter dimension slightly smaller than the inner diameter dimension of the opening portion 21 of the bracket 2 and is fitted to the first opening portion 21a. The first fitting portion 64a and the second fitting portion 64b fitted to the second opening portion 21b and the inclined fitting portion 64c fitted to the inclined surface portion 21c are provided, and the first opening portion 21a and The second opening 21b and the inclined surface 21c are formed so as to be fitted (fitted).

  A small-diameter stepped portion 73 having an outer diameter that is slightly smaller is provided on the distal end side of the first fitting portion 64a. The O-ring 16 is disposed between the small-diameter step 73 and the first opening 21a, and the O-ring 16 is crimped to the outer surface of the small-diameter step 73 and the inner surface of the first opening 21a. It is secured.

  Further, since the fitting portion 64 of the holder 6 is formed in a cylindrical shape, a stator accommodation hole 74 for receiving the end portion of the stator 44 is opened at the center of the tip end side. The inner diameter of the stator accommodation hole 74 is set to substantially coincide with the inner diameter of the side wall portion 22 of the bracket 2, and a part of the stator 44 enters the stator accommodation hole 74 and circumscribes the inner surface of the stator accommodation hole 74. is doing.

  As shown in FIG. 4, the motor having such a structure initially has a motor body 4 such as a shaft 41, a rotor 42, a stator 44, and ball bearings 10 a, 10 b, etc. in the housing chamber 27 of the bracket 2. After that, the O-ring 16 is attached to the small diameter step portion 73 of the holder 6, and the holder 6 is fitted and assembled along the axial direction of the shaft 41 from the opening 21 side of the bracket 2.

  However, since the O-ring 16 is easy to come off and it is difficult to attach the O-ring 16 firmly to the holder 6, and there is a possibility that the O-ring 16 may be bitten when fitting, so that the O-ring 16 can be properly disposed without being detached. It has been devised.

  That is, as shown in FIG. 5, the length L1 of the small diameter step portion 73 on the fitting direction side (the axial direction side of the shaft 41) is set to be twice or more the diameter of the cross section of the O-ring 16. By doing so, if the O-ring 16 is pushed into the back of the small-diameter step 73 and attached, the end of the small-diameter step 73 protrudes from the O-ring 16 by at least the length of the diameter of the O-ring 16. It can be difficult to come off.

  Then, when the holder 6 fitted with the O-ring 16 is fitted into the bracket 2, the tip of the fitting portion 64 is initially inserted into the second opening 21 b of the bracket 2. Since the two opening portions 21b are formed to have a larger diameter than the side wall portion 22 and the first opening portion 21a, the distal end of the fitting portion 64 having a smaller diameter than the first opening portion 21a, that is, the small diameter step portion 73 can be easily obtained. 2 can be inserted into the opening 21b. Once the small diameter step 73 is inserted into the second opening 21b, the O-ring 16 cannot be removed. Further, since the O-ring 16 can move relatively freely on the small-diameter stepped portion 73, even if a slightly offset load is applied, it only needs to be elastically deformed or slightly moved, and the O-ring 16 can be bitten. It is prevented from being mounted while receiving an inappropriate load.

  As shown in FIG. 5, if the inner diameter dimension of the second opening 21b is set to be larger than the outer diameter dimension of the O-ring 16 attached to the small diameter step 73, the second opening 21b is touched. It can be inserted without being easily inserted.

  When the holder 6 is further fitted into the bracket 2, the O-ring 16 comes into contact with the inclined surface portion 21c. Since the inner surface of the inclined surface portion 21c is tapered, the O-ring 16 is in line contact with the inner surface of the inclined surface portion 21c over the entire circumference in a well-balanced manner, and is deformed or rotated by receiving a load while deforming or rotating. Move to the back. Thus, the O-ring 16 is guided to the first opening 21a, and is mounted between the small-diameter step 73 and the first opening 21a in an appropriate crimped state without being bitten.

  Before the small-diameter stepped portion 73 attached with the O-ring 16 enters the first opening 21a, the second fitting portion 64b comes into contact with the second opening 21b. For example, as shown in FIG. 5, the length L2 (total dimension) of the first fitting portion 64a and the inclined fitting portion 64c of the fitting portion 64 in the fitting direction is the fitting length of the second opening 21b. It is set to be smaller than the (depth) dimension H.

  Therefore, when the holder 6 is fitted into the bracket 2, the second fitting portion 64b is guided to the second opening portion 21b, and the small diameter step portion 73 enters the first opening portion 21a with the axial center aligned. It has become.

  When the holder 6 is fitted into the bracket 2 up to a predetermined position, the stator 44 is circumscribed inside the small diameter step portion 73, so that the crimped state of the O-ring 16 is securely held.

  In order to position the holder 6 at a predetermined position in this way, as shown in FIG. 1 and FIG. 4, a large-diameter step portion whose inner diameter dimension is formed to be a large diameter on the opening end side of the second opening portion 21. 28 is provided. On the other hand, the fitting portion 64 of the holder 6 is provided with a convex portion 75 that is received by the large-diameter step portion 28 corresponding to the large-diameter step portion 28.

  Accordingly, the convex portion 75 and the base portion of the connector 62 are received by the large-diameter step portion 28 and the recess portion 26, respectively, and the amount of fitting of the holder 6 is restricted, so that the holder 6 is positioned with high accuracy with respect to the bracket 2. The O-ring 16 is properly attached and the waterproof property is improved.

  After the holder 6 is attached to the bracket 2, a predetermined operation such as joining the connection fitting 48 and the bus bar 12 through the window hole 68 is performed, and then the cover 8 is put on the holder 6 and joined to the bracket 2.

  Since the holder 6 and the bracket 2 are positioned with high accuracy, the cover 8 is also positioned with high accuracy with respect to the holder 6, and the pressure-bonded state of the packing 14 is stabilized and the waterproof property is improved.

  In particular, the packing 14 and the O-ring 16 are advantageous in that the pressure-bonding directions thereof are substantially orthogonal to each other, so that it is difficult to exert a waterproof effect on each other.

  For example, if both the crimping directions are the same, when the O-ring 16 and the packing 14 are irreversibly deformed due to an excessive temperature change, the respective deformation amounts are piled up to create a gap, and waterproof. Although there is a risk of damage, if the crimping direction is greatly deviated in this way, such a situation does not occur, and the waterproofness is excellent accordingly.

  As described above, according to the present invention, an O-ring or the like that has conventionally been difficult to handle can be easily and appropriately mounted, and a motor excellent in workability and waterproofness can be provided.

  In addition, the motor concerning this invention is not limited to the said embodiment, The other various structure is included.

  For example, FIG. 6 shows another embodiment of the present invention. In this embodiment, the cover 8 is not used and the bracket is attached only to the holder. That is, the holder 6a of this embodiment also has the function of the cover 8, and is fixed to the bracket 2 by press-fitting or fastening with screws or the like. Reference numeral 90 denotes an intermediate body that supports the ball bearing 10b. The same components as those in the above embodiment are given the same reference numerals, and description thereof is omitted.

  It can be suitably used for in-vehicle motors such as transmission drive motors.

It is a schematic sectional drawing of the motor to which this invention is applied. It is a perspective view of a holder. It is a top view of a holder. It is a figure for demonstrating the assembly | attachment process of a motor. It is a principal part enlarged view for demonstrating an assembly | attachment process. It is a schematic sectional drawing of the motor of another embodiment of this invention.

Explanation of symbols

2 Bracket 4 Motor body 6 Holder 8 Cover 12 Bus bar 14 Packing (elastic member)
16 O-ring (elastic member)
21 opening portion 21a first opening portion 21b second opening portion 21c inclined surface portion 22 side wall portion 26 recess portion 27 accommodating chamber 28 large diameter step portion 41 shaft 42 rotor 44 stator 61 holder main body 62 connector 64 fitting portion 71 flat portion 72 concave portion 73 Small diameter step 74 Stator receiving hole 75 Convex

Claims (6)

A motor body;
A bracket in which the motor main body is accommodated in an accommodation chamber having an opening having a cylindrical opening at one end;
A holder attached to the bracket so as to close the opening;
A motor equipped with
The opening is provided with a first opening and a second opening having an inner diameter larger than the first opening in order from the inside of the housing chamber, and the first opening and the first in the opening Between the two openings, an inclined surface portion with an inclined inner surface is provided,
The holder has a fitting portion fitted into the opening,
The fitting portion includes a first fitting portion fitted into the first opening portion, a second fitting portion fitted into the second opening portion, and an inclined fitting fitted into the inclined surface portion. With joints,
The first fitting portion is formed with a small-diameter step portion having a predetermined distance from the first opening portion,
A motor in which a ring-shaped elastic member is disposed between the small diameter step and the first opening, and the elastic member is pressure-bonded to the outer surface of the small diameter step and the inner surface of the first opening. The motor according to claim 1,
The motor in which the length dimension of the small diameter step portion in the fitting direction is set to at least twice the diameter of the cross section of the elastic member. The motor according to claim 1 or 2,
The motor with which the length dimension of the said 1st fitting part and the inclination fitting part in the fitting direction is set smaller than the length dimension of the said 2nd opening part. The motor according to any one of claims 1 to 3,
The motor body has a cylindrical stator,
The bracket has a cylindrical side wall continuous to the opening, and the side wall circumscribes the stator and supports the stator,
The inner diameter of the first opening is formed larger than the inner diameter of the side wall,
A motor in which a cylindrical stator housing hole that circumscribes the stator is formed at least on the distal end side of the fitting portion. A motor according to any one of claims 1 to 4,
A motor in which a large-diameter step portion having a large inner diameter is formed on the opening end side of the second opening to position the holder. The motor according to claim 5,
On the outer periphery of the part on the opposite side of the fitting part in the holder, a flat plane part substantially orthogonal to the fitting direction is provided,
A cover member that is put on the holder from the flat surface side and is integrally joined to the bracket;
A motor in which an elastic member for sealing is pressure-bonded between the cover member and the flat portion.

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