Lead wire holding part structure and motor

Abstract

A holding part structure, in which a lead wire (4) is held between a first component (1) and a second component (2) combined with the first component (1) and in which the lead wire (4) is drawn outward from the inside of the first component (1) and the second component (2), is provided with: two first recesses (6) that have grooves (6G) which extend in the extension direction of the lead wire (4) and which are provided spaced apart from each other along said extension direction; and a second recess (7) that is positioned between the two first recesses (6) in the combined state of the first component (1) and the second component (2), and that has a groove (7G) which is in the opposite direction from the grooves (6G) of the first recesses (6) and which extends in the extension direction. In the combined state, the lead wire (4) disposed in the grooves (6G) of the first recesses (6) and in the groove (7G) of the second recess (7) is bent and held by the first recesses (6) and the second recess (7).

Description

Lead wire holding structure and motor

[0001] The present invention relates to a holding structure for holding lead wires and a motor to which the same is applied.

[0002] Structures for holding lead wires that are drawn from the inside to the outside of electronic devices using lead wires have been proposed. For example, Patent Document 1 discloses an electric motor configured so that lead wires connected to a circuit board are drawn to the outside through a bushing. The bushing in Patent Document 1 has a pair of holding pieces that sandwich and hold the lead wires from both sides, one of which has a holding groove that holds each lead wire individually. The other holding piece has an engaging protrusion that firmly holds the lead wires by pressing a portion of the periphery of the lead wires accommodated in the holding groove.

[0003] Patent No. 5967349

[0004] However, in the configuration of Patent Document 1, the lead wires connected to the circuit board extend in a substantially straight line from the ends of the lead wires held in the bushing's retaining grooves to the outside. Therefore, when a tensile force is applied to the lead wires in the longitudinal direction (extension direction), the tensile force acts on the end connected to the circuit board. Therefore, depending on the magnitude of the tensile force, the end connected to the circuit board may become detached, potentially resulting in a break. Therefore, there is room for improvement in the structure of the portion where the lead wires extend outside the device. This issue is not limited to electric motors as described in Patent Document 1, but can occur in any electronic device that uses lead wires.

[0005] The lead wire holding structure and motor of the present invention were devised in consideration of these problems, and one of the objects thereof is to prevent breakage of the lead wires. However, this object is not limited to this. Another object of the present invention is to achieve effects that cannot be obtained by conventional techniques, which are derived from the configurations shown in the detailed description of the invention described below.

[0006] The disclosed lead wire holding structure and motor can be realized as the following disclosed aspects (application examples), which solve at least part of the above-mentioned problems. Aspects 2 to 6 and Aspects 8 to 9 are all aspects that can be selected as appropriate and are all aspects that can be omitted. None of Aspects 2 to 6 and Aspects 8 to 9 discloses an aspect or configuration that is essential to the present invention.

[0007] Aspect 1. The disclosed lead wire retention structure is a retention structure in which a lead wire is retained between a first component and a second component that is combined with the first component, and in which the lead wire is drawn out from inside the first component and the second component, the retention structure comprising two first recesses that are arranged side by side and spaced apart along the extension direction of the lead wire and have grooves that extend in the extension direction, and a second recess that is located between the two first recesses in a combined state of the first component and the second component and has grooves that extend in the extension direction but in the opposite direction to the grooves of the first recesses, and in the combined state, the lead wires placed in the grooves of the first recess and the grooves of the second recess are bent and retained by the first recess and the second recess.

[0008] Aspect 2. In Aspect 1 above, it is preferable that in the combined state, the lead wire is held by one or both of two opposing corner portions of the first recess and the second recess on one side and two opposing corner portions of the first recess and the second recess on the other side. Aspect 3. In Aspect 1 or 2 above, it is preferable that one of the first recess and the second recess is provided on the first component side and the other is provided on the second component side, and that the recess provided on the component side on which the lead wire is placed, of the first component or the second component, has a narrower groove width than the recess provided on the component side on which the lead wire is not placed.

[0009] Aspect 4. In any one of Aspects 1 to 3 above, at least one of the first recess and the second recess preferably has a protrusion protruding from the inner surface of the groove. Aspect 5. In Aspect 4 above, the protrusion is preferably provided on one or both of two opposing side surfaces of the inner surface of the groove. Aspect 6. In Aspect 4 or 5 above, the protrusion preferably has a tapered shape from the base end to the tip end.

[0010] Aspect 7. The disclosed motor is a motor to which the lead wire holding portion structure according to any one of Aspects 1 to 6 above is applied, wherein the first component is a housing in which an object to which the lead wire is to be connected is disposed, and the second component is an end bell that is fitted into an opening of the housing. Aspect 8. In Aspect 7 above, it is preferable that the first recess and / or the second recess are integrally formed with the housing and / or the end bell. Aspect 9. In Aspect 7 above, it is preferable that the first recess and / or the second recess are formed in a component separate from the housing and the end bell, and the separate component is attached to each of the housing and the end bell.

[0011] According to the disclosed lead wire holding portion structure and motor, the lead wire is bent and held by the first recess and the second recess, so that breakage of the lead wire can be prevented even if a tensile force is applied in the extension direction (longitudinal direction) of the lead wire.

[0012] 4A and 4B are cross-sectional views illustrating the lead wire holding structure according to the embodiment, cut along the longitudinal direction of the lead wire; FIG. 5A is an exploded perspective view illustrating the lead wire holding structure according to the embodiment, with the lead wires omitted; FIG. 6A is a diagram illustrating a motor to which the lead wire holding structure according to the embodiment is applied, where (a) is a plan view and (b) is a cross-sectional view taken along the arrow A-A in FIG. 3A; FIG. 6B is a diagram illustrating a main part of a housing of the motor of FIG. 3A, where (a) is a plan view and (b) is a cross-sectional view taken along the arrow B-B in FIG. 4A; FIG. 6B is a diagram illustrating a main part of an end bell of the motor of FIG. 3A, where (a) is a plan view and (b) is a cross-sectional view taken along the arrow C-C in FIG. 5A; and FIG. 6C is a cross-sectional view illustrating a state in which the lead wires are held by the lead wire holding structure applied to the motor of FIG. 3.

[0013] A lead wire holding structure and a motor according to an embodiment will be described with reference to the drawings. The embodiments described below are merely examples, and are not intended to exclude various modifications or applications of techniques not explicitly described in the following embodiments. The configurations of the present embodiment can be modified in various ways without departing from the spirit of the invention. Furthermore, they can be selected or combined as needed.

[0014] 1 and 2 are diagrams illustrating a lead wire holding portion structure (hereinafter referred to as the "holding portion structure"). As shown in FIG. 1, the holding portion structure holds a lead wire 4 between a first component 1 and a second component 2 that is combined with the first component 1, and the lead wire 4 is drawn out from inside the first component 1 and the second component 2. The end 4a of the lead wire 4 is connected to, for example, a component (hereinafter referred to as a "connection object 5") that is disposed inside the first component 1 and the second component 2. The number of lead wires 4 is not particularly limited. When one lead wire 4 is connected to the connection object 5, one holding portion structure is provided. When multiple lead wires 4 are connected to the connection object 5, the same number of holding portion structures as the number of lead wires 4 are provided. In other words, a holding portion structure is provided for each lead wire 4.

[0015] The connection object 5 is a component to which the end 4a of the lead wire 4 is connected, such as a coil or a circuit board. In this embodiment, the first component 1 is a component on which the connection object 5 is placed (housed or attached). Meanwhile, the second component 2 is a component that is combined (attached, engaged, or attached) to the first component 1 and is a separate component from the first component 1. The connection object 5 may be placed on the second component 2 side. When the first component 1 and the second component 2 are combined (hereinafter referred to as the "combined state"), a mating surface 3 is formed by two opposing or contacting surfaces of the two components 1 and 2 (the surface on the first component 1 side and the surface on the second component 2 side). In FIG. 1 , the mating surface 3 is schematically shown by a two-dot chain line. The mating surface 3 is not limited to a flat surface but may be a curved surface, and it is not limited to being flush, but may also be a stepped or inclined surface. The retaining structure is provided, for example, on a portion of the mating surface 3. In this case, a gap is provided in this portion, allowing at least the lead wire 4 to be inserted therethrough.

[0016] 1 and 2 , the retaining portion structure includes two first recesses 6 arranged side by side and spaced apart from each other along the extension direction of the lead wire 4, and one second recess 7 located between the two first recesses 6 when the first component 1 and the second component 2 are combined. The "extension direction" here refers to the direction in which the lead wire 4 extends at the position where the retaining portion structure is provided when the lead wire 4 is pulled outward from its end 4 a (the longitudinal direction of the lead wire 4 at the position of the retaining portion structure). Since the second recess 7 is disposed between the two first recesses 6, the separation distance between the two first recesses 6 is set to be longer than the dimension of the second recess 7 in the extension direction.

[0017] The two first recesses 6 are formed by cutting out a portion of a predetermined component (the first component 1, the second component 2, or a component other than these), and each has a groove 6G that extends in the extension direction and is open in the extension direction. The two first recesses 6 are formed so that the grooves 6G are positioned on a substantially straight line. A lead wire 4 is placed in this groove 6G. As shown in FIG. 2 , each groove 6G is formed by two opposing side surfaces 6Gs and a bottom surface 6Gb. Each groove 6G shown in FIG. 2 has a shape in which the lower ends of the two flat side surfaces 6Gs in the figure are connected by a curved bottom surface 6Gb that is convex downward. Note that the shape of the groove 6G is not limited to this.

[0018] The second recess 7 is formed by cutting out a portion of a specific component (the first component 1, the second component 2, or a component other than these) that is different from the component in which the first recess 6 is provided, and has a groove 7G that extends in the extension direction and is open in the extension direction. The lead wire 4 is also disposed in this groove 7G. The groove 7G is formed of two opposing side surfaces 7Gs and a bottom surface 7Gb. The groove 7G shown in FIG. 2 has a shape in which the upper ends of the two flat side surfaces 7Gs in the figure are connected by the curved bottom surface 7Gb that is convex upward, but the shape of the groove 7G is not limited to this.

[0019] In the retaining portion structure, these two types of grooves 6G, 7G are provided in opposite directions. Therefore, as shown in FIG. 1 , when assembled, the lead wires 4 arranged in the grooves 6G and 7G are bent and held by the first recesses 6 and the second recesses 7. That is, when viewed from a direction perpendicular to both the extension direction of the lead wires 4 and the depth direction of the grooves 6G, 7G, the lead wires 4 are held in a U-shaped bent state. This prevents breakage of the lead wires 4 (e.g., detachment or breakage of the end portions 4a) even when an external tensile force is applied to the lead wires 4. Note that "opposite directions" here means that the depth directions toward the bottom surfaces 6Gb, 7Gb of the grooves 6G, 7G are 180 degrees different (reversed).

[0020] 1 and 2, two first recesses 6 are provided on the first component 1 side, and a second recess 7 is provided on the second component 2 side. Therefore, when the first component 1 and the second component 2 are assembled together with the lead wire 4 placed in each groove 6G of the two first recesses 6, the lead wire 4 is positioned in the groove 7G of the second recess 7 and pressed against the bottom surface 7Gb of the groove 7G. In other words, the lead wire 4 is sandwiched between the grooves 6G, 7G of the two recesses 6, 7 from two directions that are 180 degrees apart, and is held bent in a U-shape as shown in FIG.

[0021] The second recess 7 may be provided on the first component 1 side, and two first recesses 6 may be provided on the second component 2 side. Even in this case, as with the above, the lead wire 4 is sandwiched between the grooves 6G, 7G of the two recesses 6, 7 from two directions that are 180 degrees apart, and is therefore bent and held in a U-shape. The first recess 6 does not have to be directly formed on the first component 1 or the second component 2. For example, the first recess 6 may be provided on a component (not shown) other than the components 1, 2, and this component may be attached to the first component 1 or the second component 2. The same applies to the second recess 7. That is, the second recess 7 does not have to be directly formed on the first component 1 or the second component 2. For example, the second recess 7 may be provided on a component (not shown) other than the components 1, 2 and the component on which the first recess 6 is provided, and this component may be attached to the first component 1 or the second component 2 (a component on which the first recess 6 is not provided).

[0022] In the retaining portion structure, it is preferable that the lead wire 4 be held by the corner portions 6E, 7E of each recess 6, 7 when assembled. Specifically, it is preferable that the lead wire 4 be held by two opposing corner portions 6E, 7E of one first recess 6 (e.g., the left first recess 6 in FIG. 1 ) and second recess 7, and two opposing corner portions 6E, 7E of the other first recess 6 (the right first recess 6 in FIG. 1 ) and second recess 7. Note that the "corner portions" refer to the edge portions of each groove 6G, 7G that are open in the extension direction. It is more preferable that each corner portion 6E, 7E bite into the lead wire 4. The corner portions 6E, 7E more firmly hold the lead wire 4. Note that the corner portions 6E, 7E may have a so-called C-chamfered shape.

[0023] In the retaining portion structure, one of the first recess 6 and the second recess 7 is provided on the first component 1 side, and the other of the first recess 6 and the second recess 7 is provided on the second component 2 side. However, the recess 6 or 7 provided on the component on which the lead wire 4 is disposed (here, the first component 1) preferably has a narrower groove width than the recess 7 or 6 provided on the component on which the lead wire 4 is not disposed (here, the second component 2). The "groove width" here refers to the distance between the two side surfaces forming the groove. In FIGS. 1 and 2 , the first recess 6 is provided on the first component 1 side on which the lead wire 4 is disposed, and the second recess 7 is provided on the second component 2 side. Therefore, it is preferable that the groove width of the first recess 6 is narrower than the groove width of the second recess 7. Note that, in the case of an inverted configuration, the relationship between the groove widths is also preferably reversed.

[0024] When the lead wire 4 is connected to the connection object 5 arranged on the first component 1, the second component 2 is assembled to the first component 1 with the lead wire 4 positioned in the groove of a recess on the first component 1 side (e.g., first recess 6). Therefore, for example, if the groove width of the first recess 6 is narrower than the groove width of the recess on the second component 2 side (in this case, second recess 7), the lead wire 4 will be more easily inserted into the groove 7G of the second recess 7 when bending the lead wire 4, improving assembly efficiency. Note that if the groove width of the recess on the first component 1 side (e.g., first recess 6) is equal to or slightly larger than the outer diameter of the lead wire 4, the recess allows the lead wire 4 to be positioned, further improving assembly efficiency.

[0025] As shown in FIG. 2 , in the retaining portion structure, it is preferable that at least one of the first recess 6 and the second recess 7 has a protrusion 6P, 7P protruding from the inner surface of the groove 6G, 7G. The protrusion 6P, 7P functions to bite into the lead wire 4 disposed in the groove 6G, 7G, thereby more firmly holding the lead wire 4 (similar to the corner portion 6E, 7E). In the example shown in FIG. 2 , of the two first recesses 6, the protrusion 6P is provided in one of the first recesses 6 that is closer to the connection object 5, and the protrusion 7P is also provided in the second recess 7. In other words, the other first recess 6 that is farther from the connection object 5 (located further outward) does not have a protrusion 6P. As a result, when the first component 1 and the second component 2 are combined (when the lead wire 4 is bent), the lead wire 4 located in the other first recess 6 without the protrusion 6P can slide within the groove 6G, and bending deformation of the lead wire 4 is not hindered.

[0026] The protrusion 6P is preferably provided on a portion of the inner surface of the groove 6G in the extension direction (the center portion in the extension direction in FIG. 2 ), and is further preferably provided on one or both of two opposing side surfaces 6Gs of the inner surface (i.e., not on the bottom surface 6Gb). This prevents the lead wire 4 from being pushed up from the bottom surface 6Gb when the first component 1 and the second component 2 are assembled (when the lead wire 4 is bent), preventing the second component 2 from floating up relative to the first component 1 and ensuring good assembly. Furthermore, the protrusion 6P is preferably tapered from the base end (the end that contacts the inner surface) to the tip. This allows the tip to more easily bite into the lead wire 4, improving retention.

[0027] The same applies to the protrusions 7P. That is, the protrusions 7P are preferably provided on a portion of the inner surface of the groove 7G in the extension direction (the central portion in the extension direction in FIG. 2 ), and further preferably on one or both of the two opposing side surfaces 7Gs of the inner surface (not on the bottom surface 7Gb). Furthermore, the protrusions 7P also preferably have a tapered shape from the base end (the end that contacts the inner surface) to the tip. The protrusions 6P may be provided on both of the two first recesses 6, or the protrusions 6P, 7P may be provided on only one of the first recess 6 and the second recess 7.

[0028] [2. Motor] Next, a motor 10 to which the above-described holding portion structure is applied will be described as an example of the holding portion structure. Fig. 3(a) is a plan view of the motor 10, and Fig. 3(b) is an axial cross-sectional view of the motor 10 passing through the holding portion structure (a cross-sectional view taken along the arrows A-A in Fig. 3(a)). As shown in Fig. 3(b), the motor 10 is an inner rotor type brushless motor, and is configured such that a rotor 20 that rotates integrally with a shaft 21 and a stator 30 located radially outward of the rotor 20 (hereinafter simply referred to as "outside") are housed in a housing 11. In the motor 10 of this example, an impeller (not shown) is fixed to the shaft 21 and functions as a drive source for a blower.

[0029] The rotor 20 has a magnet 22 fixed to the shaft 21 and two balancers 23 that axially sandwich the magnet 22, and is rotatably fixed to the housing 11 and the end bell 12 by bearings 24. The stator 30 has a stator core 31 fixed to the inner circumferential surface of the housing 11, and a coil 35 wound around the stator core 31 with an insulator 32 interposed between them. Lead wires 14 are connected to the ends of the coil 35.

[0030] The housing 11 has a bottomed cylindrical portion 11A that defines a space for arranging the rotor 20 and the stator 30, and an annular portion 11B that defines a space for arranging the impeller between itself and a cover member (not shown). The annular portion 11B is formed continuously from the outer peripheral surface of the side wall portion 11c of the bottomed cylindrical portion 11A to the outside. The upper end of the annular portion 11B functions as a flange portion 11f that extends outward from the side wall portion 11c.

[0031] The bottom 11d of the bottomed tubular portion 11A is provided with a through-hole through which the shaft 21 is inserted and a step 11e to which a bearing 24 and an O-ring 25 are fixed. The opening of the bottomed tubular portion 11A (the opening formed by the upper edge of the side wall portion 11c) is covered by an end bell 12. The end bell 12 is a cover member that is combined with the housing 11. In this embodiment, the outer peripheral end 12a of the end bell 12 is placed on the flange portion 11f of the housing 11, and the end bell 12 is fixed to the housing 11.

[0032] That is, in this embodiment, the housing 11 corresponds to the first component 1, the end bell 12 that fits into the opening of the housing 11 corresponds to the second component 2, the lead wire 14 is held between the housing 11 and the end bell 12 and is drawn out from the interior of the housing 11 and the end bell 12. The coil 35 to which the end of the lead wire 14 is connected corresponds to the connection object 5, and the opposing surfaces of the flange portion 11f and the outer peripheral end 12a correspond to the mating surface 3. As shown in FIG. 3( a), the retaining portion structure of this embodiment is provided on a circumferential portion of these opposing surfaces (the portion from which the lead wire 14 is drawn). In this embodiment, five lead wires 14 are arranged in parallel, and therefore five retaining portion structures are arranged in parallel. Because all five retaining portion structures have the same configuration, in the following description, unless otherwise specified, each retaining portion structure will be assigned a reference symbol.

[0033] Next, the retaining portion structure of this embodiment will be described using Figures 4(a) and (b), Figures 5(a) and (b), and Figure 6. Figures 4(a) and (b) are a plan view and a cross-sectional view (a cross-sectional view taken along the arrows B-B in Figure 4(a)) showing the main parts of the housing 11, and Figures 5(a) and (b) are a plan view and a cross-sectional view (a cross-sectional view taken along the arrows C-C in Figure 5(a)) showing the main parts of the end bell 12. Figure 6 is a cross-sectional view showing the lead wire 14 held by the retaining portion structure. Note that only Figure 4(a) shows one lead wire 14.

[0034] As shown in FIG. 4B , the flange portion 11f of the housing 11 has an end surface (top surface in the figure) facing the end bell 12 that is not flat but has an axially uneven surface. Hereinafter, for convenience, the surface facing the end bell 12 (the surface facing the end bell 12) will be referred to as the "upper end surface." Specifically, when the axial position of the top end surface of the side wall portion 11c is defined as a reference position X, two annular protrusions 11h are provided that protrude toward the end bell 12 relative to the reference position X, and two annular recesses 11g are provided that are recessed away from the end bell 12 relative to the reference position X. When viewed from the axial direction, the annular protrusions 11h and the annular recesses 11g are each concentrically arranged around the axis of the shaft 21, and are alternately arranged in the following order from the radially inner side (hereinafter simply referred to as the "inner side"): annular recess 11g, annular protrusion 11h, annular recess 11g, and annular protrusion 11h.

[0035] In this embodiment, first recesses 16 corresponding to the above-described first recesses 6 are formed in each of the two annular protrusions 11h. That is, the two first recesses 16 are formed integrally with the housing 11. In this embodiment, as shown in FIG. 4( a), one first recess 16 is formed by cutting out the upper end surface of the inner annular protrusion 11h, and the other first recess 16 is formed by cutting out the upper end surface of the outer annular protrusion 11h. Each first recess 16 has a groove 16G extending in the extension direction of the lead wire 14.

[0036] In this embodiment, as shown in FIG. 4( b), the outer annular protrusion 11 h protrudes more from the reference position X than the inner annular protrusion 11 h, but the bottom positions (axial positions of the bottoms) of the grooves 16G of the two first recesses 16 are substantially the same. In other words, the groove 16G of the outer first recess 16 is formed deeper. The groove widths of the two first recesses 16 are substantially the same. Also, as shown in FIG. 4( a), the outer first recess 16 is provided with a protrusion 16P corresponding to the protrusion 6P.

[0037] As shown in FIG. 5B , the end surface of the outer peripheral end 12a of the end bell 12 facing the housing 11 (the bottom surface in the figure) is not flat but has an axially uneven surface. Hereinafter, for convenience, the surface facing the housing 11 (the surface facing the housing 11) will be referred to as the "lower end surface." The lower end surface of the outer peripheral end 12a has an uneven shape that matches the shape of the upper end surface of the flange portion 11f. Specifically, the end bell 12 has a mounting surface 12b that is mounted on (disposed in contact with) the outer annular protrusion 11h of the flange portion 11f, an annular protrusion 12c that fits into the outer annular recess 11g, and an opposing surface 12d that faces the inner annular protrusion 11h.

[0038] The annular protrusion 12c protrudes from the mounting surface 12b toward the housing 11. The radial dimension of this annular protrusion 12c is set to a size such that, when the mounting surface 12b is placed on the annular protrusion 11h (i.e., the combined state described above), the annular protrusion 12c does not contact the annular recess 11g and forms a gap between the two annular protrusions 11h and each of them that is equal to or slightly smaller than the outer diameter of the lead wire 14. The amount of protrusion of the annular protrusion 12c from the mounting surface 12b is set to a size such that, for example, the annular protrusion 12c does not contact the annular recess 11g in the combined state. The mounting surface 12b, the annular protrusion 12c, and the opposing surface 12d all have concentric ring shapes centered on the axis of the shaft 21 when viewed in the axial direction, and are provided in this order from the outside.

[0039] In this embodiment, a second recess 17 corresponding to the above-described second recess 7 is formed in the annular protrusion 12c. That is, the second recess 17 is integrally formed with the end bell 12. In this embodiment, as shown in FIG. 5( a), the second recess 17 is formed by cutting out the upper end surface of the annular protrusion 12c. The second recess 17 has a groove 17G extending in the extension direction of the lead wire 14. The depth of the groove 17G is set depending on the outer diameter of the lead wire 14, the size of the annular protrusion 12c relative to the annular recess 11g, the depth of the groove 16G of the first recess 16, and the like. The groove width of the groove 17G is set slightly smaller than the groove width of the groove 16G.

[0040] 6 , in the assembled state in which the end bell 12 is assembled with the housing 11, the lead wire 14 arranged in the groove 16G of the first recess 16 and the groove 17G of the second recess 17 is bent and held by the first recess 16 and the second recess 17. Furthermore, the lead wire 14 is held by two opposing corner portions 16E, 17E of the first recess 16 and the second recess 17 on one side, and two opposing corner portions 16E, 17E of the first recess 16 and the second recess 17 on the other side.

[0041] [3. Effects] (1) In the above-described holding portion structure, as shown in Fig. 1 , the lead wire 4 is held between the first component 1 and the second component 2, and the lead wire 4 is drawn out from inside the first component 1 and the second component 2. At this time, the lead wire 4 is bent and held by the two first recesses 6 and the one second recess 7, and therefore breakage of the lead wire 4 can be suppressed even if a tensile force is applied in the longitudinal direction (extension direction) of the lead wire 4. For example, when the lead wire 4 is connected to a connection object 5 disposed inside the first component 1 and the second component 2, a tensile force is less likely to act on the connection point, and therefore breakage of the lead wire 4 can be suppressed.

[0042] (2) In the above-described holding portion structure, when the first component 1 and the second component 2 are combined, the lead wire 4 may be held by two opposing corner portions 6E, 7E of the first recess 6 and the second recess 7 on one side and two opposing corner portions 6E, 7E of the first recess 6 and the second recess 7 on the other side. In this case, the lead wire 4 can be firmly held by the four corner portions 6E, 7E. This makes it possible to prevent breakage of the lead wire 4 even if a tensile force is applied to the lead wire 4 in the longitudinal direction.

[0043] (3) In the above-described retaining portion structure, the recess (first recess 6 or second recess 7) provided on the component (first component 1) on which the lead wire 4 is arranged may have a narrower groove width than the recess (second recess 7 or first recess 6) provided on the component (second component 2) on which the lead wire 4 is not arranged. In this case, when the lead wire 4 arranged in the recess on the first component 1, which is the component on which the lead wire 4 is arranged, is bent in the recess on the second component 2, the lead wire 4 easily enters the groove of the recess on the second component 2, thereby improving assembly. In particular, when the dimensional tolerance of the groove width of the recess on the first component 1 and the dimensional tolerance of the wire diameter of the lead wire 4 are combined and the groove width of the recess on the second component 2 is made wider than the range in which the lead wire 4 can finally be arranged on the first component 1, simply assembling the second component 2 to the first component 1 can absorb the dimensional tolerances of each component, thereby facilitating assembly.

[0044] (4) In the above-described holding portion structure, at least one of the first recess 6 and the second recess 7 may have a protrusion 6P, 7P protruding from the inner surface of the groove 6G, 7G. In this case, the protrusion 6P, 7P can firmly hold the lead wire 4. As a result, even if a tensile force is applied to the lead wire 4 in the longitudinal direction, the tensile force can be prevented from acting on the connection point between the lead wire 4 and the connection object 5, thereby preventing breakage. The protrusion 6P or 7P may be provided on only one of the first recess 6 or the second recess 7. In this case, compared to when the protrusions 6P and 7P are provided on both the first recess 6 and the second recess 7, the protrusions 6P and 7P will less likely bite into the lead wire 4 during assembly. This reduces the repulsive force of the lead wire 4 caused by the bite, making it easier to assemble each component into its designated position.

[0045] (5) The above-described protrusions 6P, 7P may be provided on one or both of two opposing side surfaces 6Gs, 7Gs of the inner surface of the groove 6G, 7G. In this case, the lead wire 4 is prevented from lifting up by the protrusions 6P, 7P and can be firmly held. (6) The protrusions 6P, 7P may also be tapered from the base end to the tip. In this case, the tip of the protrusions 6P, 7P can more easily bite into the lead wire 4, thereby more firmly holding the lead wire 4.

[0046] (7) The above-described retaining structure is applied to the above-described motor 10. Specifically, the coil 35, which is the connection object of the lead wire 14, is disposed in the housing 11 as the first component 1, and the end bells 12, which are the second component 2, are combined with the housing 11, and the above-described retaining structure is applied when the lead wire 14 is held between the housing 11 and the end bells 12. This provides the effects of (1) to (6) above, thereby ensuring the pull-out resistance of the lead wire 14 drawn outward from the inside of the housing 11 and the end bells 12 and preventing breakage inside the motor 10.

[0047] (8) Furthermore, in the above-described motor 10, first recess 16 is formed integrally with housing 11, and second recess 17 is formed integrally with end bell 12, which improves assembly ease without increasing the number of parts. Note that it is also possible to employ only one of the structures in which first recess 16 is formed integrally with the housing or second recess 17 is formed integrally with the end bell.

[0048] [4. Other] The motor 10 described above is merely an example and is not limited to the above configuration. For example, both the first recess 16 and the second recess 17 may be provided in components separate from both the housing 11 and the end bell 12. In this case, the housing 11 and the end bell 12 each have a portion (e.g., a recess or opening) to which the separate components can be attached, and the separate components are attached to the respective portions, thereby achieving the same effects as the motor 10 described above. The shapes of the first recess 16 and the second recess 17 need to be determined based on the thickness of the lead wire 14. However, with this configuration, it is sufficient to attach separate components to the housing 11 and the end bell 12, so that the housing 11 and the end bell 12, which are the main components of the motor 10, can be used in common regardless of the thickness of the lead wire 14.

[0049] One of first recess 16 or second recess 17 may be provided integrally with the housing, and the other may be provided separately from the end bell. Alternatively, one of first recess 16 or second recess 17 may be provided separately from the housing, and the other may be provided integrally with the end bell.

[0050] In the above-described motor 10, the first recess 16 is provided on the housing 11 side and the second recess 17 is provided on the end bell 12 side, but this may be reversed. For example, even if the first recess 16 is provided integrally with the end bell 12 and the second recess 17 is provided integrally with the housing 11, the same effect as in (8) above can be obtained. Also, in the above-described motor 10, the second recess 17 does not have a protrusion, but a protrusion 7P as shown in FIG. 2 may be provided. All of the retaining portion structures described using FIGS. 1 and 2 are applicable to motors.

[0051] In the motor 10 described above, the object to which the lead wires 14 are connected is the coil 35, but the object to which the lead wires 14 are connected is not limited to this and may be, for example, a circuit board. Furthermore, the type of motor is not limited to an inner rotor brushless motor, and the present invention may be applied to an outer rotor motor, or, if lead wires are used, to a brushed motor. The application of the above-described holding portion structure is not limited to motors, and it may be applied to electronic devices other than motors.

[0052] REFERENCE SIGNS LIST 1 First component 2 Second component 4 Lead wire 6 First recess 6E Corner portion 6G Groove 6Gs Side surface 6P Protrusion 7 Second recess 7E Corner portion 7G Groove 7Gs Side surface 7P Protrusion 10 Motor 11 Housing (first component) 12 End bell (second component) 14 Lead wire 16 First recess 16E Corner portion 16G Groove 16P Protrusion 17 Second recess 17E Corner portion 17G Groove 35 Coil (connection object)

Claims

1. A holding structure for a lead wire between a first component and a second component combined with the first component, wherein the lead wire is held and drawn outward from inside the first component and the second component, the holding structure including: two first recesses spaced apart from each other along the extending direction of the lead wire and having grooves extending in the extending direction; and a second recess located between the two first recesses in the combined state of the first component and the second component, having a groove extending in the extending direction and opposite to the groove of the first recess. In the combined state, the lead wire disposed in the grooves of the first recess and the second recess is bent and held by the first recess and the second recess. A lead wire holding structure characterized by the above.

2. The lead wire holding structure according to claim 1, wherein in the combined state, the lead wire is held at one or both of two opposing corner portions of one of the first recess and the second recess and two opposing corner portions of the other first recess and the second recess.

3. Among the first recess and the second recess, one is provided on the first component side and the other is provided on the second component side. The recess provided on the component side where the lead wire is disposed among the first component and the second component has a narrower groove width than the recess provided on the component side where the lead wire is not disposed. The lead wire holding structure according to claim 1 is characterized by the above.

4. The lead wire holding structure according to claim 1, wherein at least one of the first recess and the second recess has a protrusion projecting from the inner surface of the groove.

5. The lead wire holding structure according to claim 4, wherein the protrusion is provided on one or both of two opposing side surfaces of the inner surface of the groove.

6. The lead wire holding structure according to claim 4, wherein the protrusion has a tapered shape from the base end to the tip end.

7. A motor to which the lead wire holding structure according to any one of claims 1 to 6 is applied, wherein the first component is a housing in which an object to be connected to the lead wire is disposed, and the second component is an end bell combined with an opening of the housing. A motor characterized by the above.

8. The motor according to claim 7, wherein the first recess and / or the second recess is integrally provided in the housing and / or the end bell.

9. The motor according to claim 7, wherein the first recess and / or the second recess is provided in a component separate from the housing and the end bell, and the separate component is attached to each of the housing and the end bell.

Images