Motor

The present invention relates to a motor, and more particularly to a motor having a structure in which the insertion direction of the terminal into the housing and the connection direction of the terminal and the external terminal are the same.

Generally, in a motor having a rotating shaft and an armature, a brush holder fitted to an opening of a yoke housing is provided in order to supply electric power for rotating the armature, and a terminal is arranged in the brush holder. A brush is connected to one end of the terminal, and an external terminal connected to an external power supply is connected to the other end. The power supplied from the external power supply is supplied to the brush via the terminal to rotate the armature.

Conventionally, in order to reduce the size and thickness of the entire motor in the axial direction, a structure has been known in which a terminal extends to the side of the brush holder and is connected to an external terminal (see, for example, Patent Document 1). The motor of Patent Document 1 has an armature (armature) having a rotating shaft and a commutator (commutator), a bottomed tubular yoke housing that rotatably accommodates the armature, and a yoke housing that closes the open end and slides on the commutator. It has a brush holder that holds the brushes in contact.

As shown in FIG. 6A, the brush holder 101 is connected to the holder body 102, which is fitted into the yoke housing and holds the brush, and the holder body 102, which is exposed to the outside in the radial direction and is connected to the external terminal 110. The connector portion 103 and the connecting portion 104 for connecting the holder main body 102 and the connector portion 103 are provided, and the terminal 105 is inserted across the holder main body 102, the connector portion 103, and the connecting portion 104. One end of the terminal 105 is connected to the brush, and the other end is exposed in the opening 103a of the connector 103.

The external terminal 110 is inserted into the opening 103a of the connector portion 103 and is connected to the other end side (terminal connection portion 105a side) of the terminal 105. By extending the terminal 105 to the outside in the radial direction of the brush holder 101 in this way, it is not necessary to expand the brush holder 101 in the axial direction, and it is possible to reduce the size of the brush holder 101 in the axial direction. Become.

As shown in FIG. 6B, normally, the fitting groove 101a is continuously formed in the holder body 102, the connector portion 103, and the connecting portion 104, and the terminal 105 is inserted through the fitting groove 101a. It can be assembled to the brush holder 101 and the like.

In a motor with such a structure, the assembly direction of the terminal 105 to the brush holder 101 (arrow XX direction in the figure) and the connection direction of the terminal 105 and the external terminal 110 are the same, and the power supply part to the brush is the terminal. It is formed by extending to 105. Therefore, when the external terminal 110 is pulled out from the terminal connection portion 105a, the terminal connection portion 105a side of the terminal 105 is pulled in the pull-out direction (opposite direction to the assembly direction) of the external terminal 110, and the brush holder 101 is pulled from the fitting groove 101a. Terminal 105 sometimes came off.

By the way, conventionally, in order to prevent the terminal from coming off from the connector housing, an elastic locking piece is formed by cutting out a part of the terminal, a locking hole is formed in the connector housing, and the elastic locking piece is engaged with the engaging hole. A structure engaged with is known (see, for example, Patent Document 2). According to this structure, even if a force in the pulling direction acts on the terminal, the contact portion of the elastic locking piece comes into contact with the wall surface of the engaging hole and becomes a pulling resistance, so that the terminal does not come off from the connector housing. , The terminal can be held reliably.

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2003-111349</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 11-3739</text></patcit>

<p> However, when the retaining structure of Patent Document 2 is applied to a motor having a structure in which the terminal extends outward in the radial direction as in Patent Document 1, the following problems occur. That is, in the motor of Patent Document 1, since the extension portion of the terminal is fitted into the fitting / insertion groove of the housing, when the terminal connection portion is pulled in the pulling direction, the terminal tilts with the extension portion as a fulcrum, and the terminal remains as it is. If it continues to tilt, it will eventually fall out of the insertion groove of the brush holder.</p><p> Therefore, even if the retaining structure of Patent Document 2 can be applied to the motor of Patent Document 1, the terminal is tilted when the external terminal is pulled out from the terminal, so that the elastic locking piece of the terminal and the housing are engaged with each other. It was released due to the inclination of the terminal, and there was a risk that the terminal would come out of the housing.</p><p> Further, since the terminal of Patent Document 1 has a small width, it is very difficult to cut up the terminal in the plate thickness direction to form an elastic engaging portion. Further, since it is necessary to form an engaging hole on the side of the housing (brush holder in Patent Document 1), there is also a problem that it is difficult to process the housing.</p><p> In view of the above problems, an object of the present invention is to provide a motor having a simple structure and capable of efficiently preventing the terminal from coming off the housing.</p>

<p> According to the motor of the present invention, the object includes a motor body having a yoke housing that rotatably accommodates the armature, and a terminal that is assembled to the yoke housing and supplies electric power supplied from an external terminal to the armature. A motor including a brush device, wherein the terminal has a terminal connection portion that can be connected to the external terminal, an extension portion formed by bending from the terminal connection portion, and the terminal of the extension portion. The brush contact portion formed on the opposite end side to the connecting portion and electrically connected to the armature via the brush, and the terminal connecting portion protruding to the side opposite to the side on which the extension portion is formed, and the tip side is the brush. The terminal has a branch portion extending in the assembly direction to the device, and the terminal is inclined with a part of the extension portion as a fulcrum when a force is applied to the terminal connection portion in the direction opposite to the assembly direction. The problem is solved by the branch portion coming into contact with the wall surface of the brush device due to the inclination of the terminal.</p><p> As described above, the terminal is formed with a branch portion of the terminal connecting portion that projects in the direction opposite to the extending direction of the extending portion and extends in the assembling direction to the brush device. When a force is applied to the terminal connection portion in the direction opposite to the assembly direction when the external terminal connected to the terminal connection portion is pulled out from the terminal connection portion, the terminal is tilted with the extension portion as a fulcrum. Since the branch portion comes into contact with the wall surface of the brush device due to this inclination, the inclination of the terminal is restricted and the terminal does not incline any more. Therefore, it is possible to prevent the terminal from tilting and coming out of the brush device.</p><p> In this case, it is preferable that the branch portion has a substantially L-shaped side view.</p><p> As described above, since the side view shape of the branch portion is substantially L-shaped, the branch portion easily comes into contact with the wall surface of the brush device when the terminal is tilted. Therefore, it is possible to more reliably prevent the terminal from tilting and coming out of the brush device.</p><p> Further, it is preferable that the brush device includes a hole into which the branch can be inserted.</p><p> In this way, since the branch portion of the terminal is inserted into the hole portion of the brush device, when the terminal is tilted, the branch portion abuts on the inner wall of the hole portion to regulate the tilting. Therefore, it is possible to more reliably prevent the terminal from coming off the brush device. Further, by inserting the branch portion into the hole portion, it is possible to prevent the terminal from being displaced in the brush device. Further, since the hole portion of the brush device can be used for positioning the terminal, the terminal can be easily assembled to the brush device.</p><p> Further, it is preferable that the end face of the branch portion of the terminal is arranged so as to be located on the opposite side of the extension portion.</p><p> In this way, since the end face of the branch portion is located on the opposite side of the extension portion, the end face of the branch portion comes into contact with the wall surface of the brush device when the terminal is tilted. Therefore, the branch portion easily bites into the wall surface of the brush device, and the terminal can be more reliably prevented from coming off.</p>

<p> According to the motor of the present invention, a branch portion is formed at the terminal connection portion, and when a force acts on the terminal connection portion in the direction opposite to the assembly direction and the terminal is tilted, the branch portion hits the wall surface of the brush device. In contact, the inclination of the terminal is regulated and the terminal does not incline any more. Therefore, it is possible to prevent the terminal from tilting and coming out of the brush device. In this way, it is possible to efficiently prevent the terminal from coming off from the brush device with a simple configuration of forming a branch portion in the terminal.</p>

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that the members, arrangements, etc. described below are not limited to the present invention, and of course, various modifications can be made according to the gist of the present invention.

In the motor of the present invention, a branch portion of the terminal connection portion forming the terminal that protrudes to the opposite side of the extension portion for supplying electric power to the armature and extends in the assembling direction to the brush device is formed, and this branch portion and the brush are formed. The feature is that the terminal is prevented from coming off by coming into contact with the wall surface of the device. Hereinafter, the motor of the present invention will be described in detail.

1 to 5 are explanatory views of a motor according to an embodiment of the present invention, FIG. 1 is a partial cross-sectional view showing an overall configuration of a motor body, and FIG. 2 is a perspective view showing an overall configuration of an end housing and a terminal. Fig. 3 is an exploded perspective view showing the end housing and terminal disassembled, Fig. 4 is a partial cross-sectional view showing the state where the terminal is attached to the end housing, and Fig. 5 is the terminal tilted when the external terminal is pulled out from the terminal. It is a partial cross-sectional view which shows the state.

The motor according to the present embodiment can be applied to, for example, a power seat in which the seat position such as the front-rear position, the vertical position, and the angle of the backrest portion of the automobile seat can be adjusted. As shown in FIG. 1, the motor 1 of the present invention includes a motor body 2 having a yoke housing that rotatably accommodates an armature, and a terminal that is assembled to the yoke housing and supplies electric power supplied from an external terminal to the armature. The brush device 3 having the above is provided as a main component.

The motor body 2 has a bottomed cylindrical yoke housing 4 having an opening 4a. A plurality of magnets 5 are fixed to the inner peripheral surface of the yoke housing 4, and an armature 6 is rotatably housed inside the magnets 5. The armature 6 is provided with a rotation shaft 7 along the longitudinal direction. The center of the bottom of the yoke housing 4 projects outward, and a bearing 8 is provided at this protruding portion, and one end side of the rotating shaft 7 is rotatably supported by the bearing 8. A commutator (commutator) 9 is fixed to the other end side of the rotating shaft.

A brush device 3 is fitted in the opening 4a of the yoke housing 4. In the present embodiment, the brush device 3 includes a resin end housing 11 so as to cover the opening 4a of the yoke housing 4. The end housing 11 is composed of an end housing main body 11a fitted into the opening 4a of the yoke housing 4 and a connector portion 11b extending radially outward from the side surface of the end housing main body 11a.

As shown in FIGS. 2 and 3, the end housing main body 11a has a substantially circular shape when viewed from the front, and is attached to the output end side of the rotating shaft 7 of the motor main body 2. An opening 11c is formed in the central portion of the end housing main body 11a in a direction parallel to the rotation shaft 7, and a bearing 12 is arranged in the opening 11c. The output end side of the rotating shaft 7 is rotatably supported by the bearing 12.

The connector portion 11b is composed of a member having a U-shaped cross section. The base end side of the connector portion 11b is vertically connected to the side surface of the end housing main body 11a and is integrated with the end housing main body 11a. Further, the tip side of the connector portion 11b protrudes toward the motor body 2 in the direction parallel to the rotating shaft 7 (see FIG. 1). The tip surface of the connector portion 11b and a part of the side surface on the end housing body 11a side are open, and a connecting hole 11d for connecting to the external terminal 21 described later is formed inside the connector portion 11b.

The end housing main body 11a and the connector portion 11b are engraved with accommodating grooves 11e and 11f extending from the vicinity of the opening 11c of the end housing main body 11a to the base end portion side of the connector portion 11b. The accommodating grooves 11e and 11f are formed in parallel from the connector portion 11b side toward the end housing main body 11a, and are formed so as to be separated from the vicinity of the boundary between the end housing main body 11a and the connector portion 11b toward the opening 11c. That is, the accommodating grooves 11e and 11f are formed so as to form a Y shape when the end housing 11 is viewed from the motor body 2 side.

As shown in FIG. 3, a rectangular hole portion 11g is formed in the end portion of the accommodating groove 11e on the connector portion 11b side in the depth direction of the accommodating groove 11e. Further, a rectangular hole portion 11h is formed at the end of the accommodating groove 11f on the connector portion 11b side in the depth direction of the accommodating groove 11f.

Terminals 13 and 14 are accommodated in the accommodation grooves 11e and 11f, respectively. The terminals 13 and 14 are both made of a conductive material and are members for supplying power to the armature 6 via a brush. The terminals 13 and 14 are connected to an external terminal 21 described later, and can receive power from an external power source (not shown).

Brushes (not shown) are connected to terminals 13 and 14, respectively. Each brush is in sliding contact with the commutator 9.

As shown in FIG. 3, the terminal 13 has a terminal connection portion 13a that contacts an external terminal 21 (not shown) and receives power from a power source, and an extension portion that bends from one end side of the terminal connection portion 13a and extends in the vertical direction. 13b, the brush contact portion 13c extending in the same direction as the terminal connection portion 13a from the end opposite to the terminal connection portion 13a of the extension portion 13b, and the extension portion 13a protruding in the direction opposite to the extension portion 13b from the central portion. It has a branch portion 13d whose tip end side extends in a direction parallel to the terminal connection portion 13a (that is, an assembly direction to the end housing 11), and an end surface 13e including a punched surface on the end side of the branch portion 13d.

The terminal connection portion 13a is housed on the connector portion 11b side and is a portion that comes into direct contact with the external terminal 21. The extension portion 13b has a shape along the accommodating groove 11e, and is a portion accommodated and fixed in the accommodating groove 11e. Further, the brush contact portion 13c is a portion for connecting the brush 15 to which a hole for connecting the wiring of the brush 15 is formed. The branch portion 13d has a function of suppressing the inclination of the terminal 13 and preventing the terminal 13 from coming off from the accommodating groove 11e. The branch portion 13d has an L-shaped side view.

The terminal 13 of the present embodiment is formed by punching a single metal plate and bending it into a predetermined shape. That is, as shown in FIG. 3, the branch portion 13d is formed as a flat surface by being bent from the flat surface of the terminal connection portion 13a, and the side surface where the branch portion 13d abuts on the wall of the hole portion 11g is made of a metal material. It is a surface formed by punching, and is formed by an end surface 13e. The end face 13e is formed to have a rougher surface roughness than a flat surface due to punching.

When the terminal 13 is accommodated in the accommodating groove 11e, the terminal connecting portion 13a is exposed in the connecting hole 11d of the connector portion 11b and protrudes in the direction parallel to the rotation shaft 7. Further, the brush contact portion 13c projects in the direction parallel to the rotation axis 7 from the vicinity of the opening 11c. When the motor body 2 and the brush device 3 are connected, the tip side of the brush contact portion 13c is located near the commutator 9. Therefore, the brush connected to the brush contact portion 13c comes into contact with the commutator 9, and the terminal 13 is electrically connected to the armature 6 via the brush and the commitator 9.

The branch portion 13d is housed in the hole portion 11g provided in the end housing 11. Since the branch portion 13d has a substantially L-shaped side view and its tip side faces the end housing 11 side, the tip end side of the branch portion 13d is inserted vertically into the hole portion 11g.

Next, the terminal 14 will be described. Terminal 14 has almost the same configuration as Terminal 13. As shown in FIG. 3, the terminal 14 has a terminal connection portion 14a that contacts an external terminal 21 (not shown) and receives power from a power source, and an extension portion that bends from one end side of the terminal connection portion 14a and extends in the vertical direction. 14b, the brush contact portion 14c extending in the same direction as the terminal connection portion 13a from the end opposite to the terminal connection portion 14a of the extension portion 14b, and the extension portion 14a protruding in the direction opposite to the extension portion 14b from the central portion. It has a branch portion 14d whose tip end side extends in a direction parallel to the terminal connection portion 14a (that is, an assembly direction to the end housing 11), and an end surface 14e including a punched surface on the end side of the branch portion 14d.

Similar to the terminal 13, the terminal 14 is formed by punching a single metal plate and bending it into a predetermined shape. Since the roles of these parts constituting the terminal 14 are the same as those of the terminal 13, detailed description thereof will be omitted here.

When the terminal 14 is accommodated in the accommodating groove 11f, the terminal connecting portion 14a is exposed in the connecting hole 11d of the connector portion 11b and protrudes in the direction parallel to the rotation shaft 7. Further, the brush contact portion 14c projects in the direction parallel to the rotation axis 7 from the vicinity of the opening 11c. The brush connected to the brush contact portion 14c contacts the commutator 9, and the terminal 14 is electrically connected to the armature 6 via the brush and the commitator 9.

The branch portion 14d is housed in the hole portion 11h provided in the end housing 11. Since the tip side of the branch portion 14d faces the end housing 11 side, the branch portion 14d is inserted vertically into the hole portion 11h.

Next, with reference to FIGS. 4 and 5, the principle of preventing the terminal 13 from coming off by the branch portion 13d will be described. FIG. 4 is a partial cross-sectional view showing a state in which the terminal 13 is attached to the end housing 11, and is a cross-sectional view of the end housing 11 cut in the vertical direction along the accommodating groove 11e of FIG. That is, FIG. 4 shows a cross-sectional view taken along the arrow AA in FIG. In addition, FIG. 5 (a) shows a state in which the terminal 13 is tilted when the external terminal 21 is pulled out from the terminal 13, and FIG. 5 (b) enlarges the area surrounded by the dotted line circle in (a). Shown.

As shown in FIG. 4, the terminal 13 is fixed to the end housing 11 with the extension portion 13b housed in the housing groove 11e. The terminal connection portion 13a protrudes into the connecting hole 11d, and the external terminal 21 is connected to the tip end side thereof. Wiring extends from the external terminal 21, and an external power supply (not shown) is connected to the wiring.

As shown in FIG. 5 (a), when the external terminal 21 is pulled from the terminal connection portion 13a in the direction opposite to the assembly direction to be pulled out, the terminal connection portion 13a is oriented in the direction opposite to the assembly direction (upward in the figure, hereinafter referred to as "pull out". The force of "direction") acts. Since the extension portion 13b is accommodated and fixed in the accommodating groove 11e, when a force in the pulling direction is applied to the terminal connection portion 13a, the end of the extension portion 13b opposite to the terminal connection portion 13a side is accommodated in the accommodating groove. It comes into contact with the inner wall surface of 11e, and the entire terminal 13 is inclined with this end as the fulcrum P.

The terminal 13 according to the motor of the present invention has a branch portion 13d protruding from the terminal connection portion 13a on the side opposite to the side on which the extension portion 13b is formed. As shown in FIG. 5 (b), since the branch portion 13d is inserted into the hole portion 11g, when the terminal 13 is tilted, the wall surface of the end housing 11 and the branch portion 13d that define the inner surface of the hole portion 11g It comes into contact with the end face 13e. In the figure, the end surface 13e of the branch portion 13d and the inner wall surface of the hole portion 11g are in contact with each other at the outer portion C1 in the inclination direction and the inner portion C2 in the inclination direction. When the end surface 13e of the branch portion 13d and the wall surface of the hole portion 11g come into contact with each other, the inclination of the terminal 13 is suppressed and no further inclination is achieved. In particular, since the end surface 13e is composed of a punched surface, the surface roughness is roughly formed, and when the end surface 13e abuts on the wall surface of the resin end housing 11, the convex portion having a coarse roughness bites into the resin and comes off. It becomes difficult. Therefore, it is possible to prevent the terminal 13 from continuing to tilt and falling off from the end housing 11.

Although the action of preventing the terminal 14 from coming off from the end housing 11 has been described above with reference to the terminal 13, the terminal 14 can also be prevented from coming off from the end housing 11 by the branch portion 14d and the end surface 14e of the branch portion 14d. Since the retaining action of the terminal 14 is the same as that of the terminal 13, detailed description thereof will be omitted here.

Further, in the above embodiment, the hole portion 11g is formed in the end housing 11, and the branch portion 13d is inserted into the hole portion 11g to prevent it from coming off. However, it is necessary to provide such a hole portion 11g. Absent. In short, the end housing 11 may have any shape as long as the branch portion 13d comes into contact with the wall surface of the end housing 11 when the terminal 13 is tilted.

For example, the end housing 11 may have a wall surface parallel to the extending direction of the branch portion 13d without providing a hole portion. In this case, the wall surface of the end housing 11 and the branch portion 13d of the terminal 13 do not abut at the portion C2 in FIG. 5 (b) but only abut with the portion C1, but this still sufficiently suppresses the inclination of the terminal 13. It is possible to prevent the terminal 13 from coming off.

<figref num="1">It is a partial cross-sectional view which shows the whole structure of a motor body.</figref><figref num="2">It is a perspective view which shows the whole structure of an end housing and a terminal.</figref><figref num="3">It is a perspective exploded view which showed the end housing and the terminal disassembled.</figref><figref num="4">It is a partial cross-sectional view which shows the state which attached the terminal to an end housing.</figref><figref num="5">It is a partial cross-sectional view which shows the state which the terminal is inclined when pulling out an external terminal from a terminal.</figref><figref num="6">It is explanatory drawing which shows the mounting structure of the terminal in the conventional motor.</figref>

Code description

1. Motor, 2. Motor body, 3. Brush holder, 4. Yoke housing, 4a .. Opening, 5. Magnet, 6. Armature, 7. Rotating shaft, 8. Bearing, 9. Commitator, 11.. End housing (housing), 11a .. Housing body, 11b .. Connector part, 11c .. Opening, 11d .. Connecting hole, 11e .. Housing groove, 11f .. Housing groove, 11g .. hole, 11h .. hole, 12.. bearing, 13.. terminal, 13a .. terminal connection, 13b .. extension, 13c .. brush contact, 13d .. branch, 13e .. End face, 14.. terminal, 14a .. terminal connection, 14b .. extension, 14c .. brush contact, 14d .. branch, 13e .. end face, 21 .. external terminal, 101 .. brush holder, 101a .. Fitting groove, 102 .. Holder body, 103 .. Connector part, 103a .. Opening, 104 .. Connecting part, 105 .. Terminal, 105a .. Terminal connection part, 110 .. External terminal, C1, C2 .. site, P .. fulcrum