JP5967349B2 - Electric motor - Google Patents

Description

  The present invention relates to an electric motor in which a lead wire is drawn out from a storage case in which a circuit board is stored via a bushing, and more specifically, an electric motor using a bushing of a type that holds a lead wire from above and below. About.

  When a lead wire is pulled out from a motor frame having a built-in stator, a bushing for protecting the lead wire is generally attached to the motor frame.

  For example, as described in Patent Document 1, this bushing has an upper base and a lower base that hold a lead wire from above and below, and guides having a semicircular cross section are provided on the mutually opposing surfaces of the upper base and the lower base. The grooves are arranged so as to face each other.

  By arranging the lead wire along the guide groove and sandwiching it between the upper base and the lower base, the lead wire can be safely pulled out to the outside. In Patent Document 2, a pair of introduction portions are provided on the inlet side of the guide groove so that the lead wire is smoothly guided to the guide wire.

  However, since the bushings described in Patent Documents 1 and 2 have a structure in which the opening width on the introduction portion side is narrow and the lead wires are sandwiched between the upper and lower grooves, the lead wires are arranged in accordance with the guide grooves. When the upper base and the lower base are fitted together, the lead wire may be pinched between the lower base and the upper base in a state where the lead wire is displaced, so that the lead wire is bitten, leading to disconnection of the lead wire or poor insulation. There was a fear.

  In particular, when the circuit board for driving is mounted on the motor, but the lead wire lead-out part on the circuit board is wide and the bushing width is narrow, the lead wire bite on the inlet side of the bushing It was easy to get up. In addition, in order to prevent such a problem, the work is required to be careful, so that the assembly workability is not so good.

JP-A-4-46541 JP 2001-339894 A

  Accordingly, an object of the present invention is to provide an electric motor with improved assembly work efficiency by improving the attachment property of a lead wire to a bushing.

To solve the problems described above, the present invention includes a stator circuit board Jo Tokoro is placed, from the inside of the housing and a bracket attached to the stator, leads connected to the circuit board In the electric motor drawn out through the bushing,
The bushing has a pair of holding pieces that sandwich and hold the lead wire from both sides, and at least one of the holding pieces introduces the lead wire into the holding piece from the inside of the housing. And a holding portion for holding the lead wire guided from the introduction portion, and the holding pieces are fixed to the opposing surfaces of the holding pieces in a state of facing each other. fixing means are provided, the inlet side of the opening width of the inlet portion of the holding piece W1, a W 1> W2 can and the outlet side of the opening width of the holding portion of the holding piece was W2,
A pair of guide bosses defining the opening width W1 are disposed on both sides of the introduction portion on the inlet side of the introduction portion of the holding piece, and the guide boss has a height that is the outer diameter of the lead wire. As described above, the tip is in contact with the other holding piece .

In the present invention, each of the holding pieces is openably connected through a thin hinge, the said stay data, relief for said thin hinge when mounting the bushing does not interfere with the stator It is preferable that a portion is provided.

  According to this, it has a pair of holding pieces that hold the lead wire sandwiched from both sides, and at least one holding piece has an introduction portion that guides the lead wire into the holding piece from the inside of the housing, and an introduction A holding portion for holding the lead wire guided from the portion is provided, and a fixing means for fixing the holding pieces in a state of facing each other is provided on the opposing surface of each holding piece, When the opening width on the inlet side of the holding piece introduction portion is W1, and the opening width on the outlet side of the holding portion holding portion is W2, W1> W2, thereby increasing the opening width on the inlet side of the bushing, It is possible to prevent so-called biting, in which the lead wire is sandwiched in a state where the lead wire has passed over the introduction portion.

  Further, the fixing means includes a boss and a receiving hole of the boss, and these are provided in at least a pair with the holding portion interposed therebetween, whereby the lead wire can be reliably fixed by the holding portion.

  Further, the holding portion is formed in one of the holding pieces, and is formed in the holding groove for holding the lead wires one by one, and in the other holding piece, and projects toward the holding grooves. Among the holding pieces, the holding pieces placed on the stator side are provided with holding grooves for holding the lead wires one by one. By holding the lead wires one by one along the holding groove formed on the holding piece, and pushing each lead wire toward the holding groove with the locking projection formed on the other holding piece, The lead wire can be securely held.

  A pair of guide bosses defining an opening width W1 are disposed on both sides of the introduction portion on the inlet side of the introduction portion of any one of the holding pieces, and the guide boss has a height of the lead wire. Since it is larger than the outer diameter and the tip abuts against the other holding piece, the lead wire can be prevented from biting, so that the amount of resin used can be further reduced.

  As a more preferable aspect, when the height of the convex portion is equal to or larger than the outer diameter of the lead wire, a part of the lead wire can be hooked on the convex portion when the lead wire is routed, and the assembly workability is further improved. it can.

  Each holding piece is connected to be openable and closable via a thin hinge, and the stator 2 has a relief portion for preventing the thin hinge from interfering with the stator when the bushing is attached. By being provided, the lead wire can be attached more easily.

The (a) sectional view and (b) partial expansion perspective view of the electric motor provided with the bushing concerning a 1st embodiment of the present invention. The partial enlarged plan view of the position where the said bushing of the stator of the said motor is attached. (A) Front view of bushing of said 1st Embodiment, (b) AA sectional drawing of Fig.3 (a), (c) BB sectional drawing of Fig.3 (a) The (a) front side perspective view and (b) back side perspective view of the bushing of the said 1st Embodiment. Explanatory drawing explaining the attachment aspect of the bushing of the said 1st Embodiment. The front view of the state which attached the bushing of the said 1st Embodiment to the stator. The perspective view of the bushing which concerns on 2nd Embodiment of this invention. (A) Front view of bushing of said 2nd Embodiment, (b) CC sectional drawing of Fig.8 (a), (c) DD sectional view taken on the line of Fig.8 (a)

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. In the following description, a molded motor will be described as an example of the electric motor of the present invention.

  As shown in FIG. 1A, the molded motor 1 includes a ring-shaped stator 2 and a rotor 3 that is coaxially disposed on the inner diameter side of the stator 2, and the stator 2 is disposed in a mold. The entire surface is covered with a synthetic resin shell 40 except for the tooth surface 22 of the stator core 21 by resin integral molding.

  A first bracket 41 in which the bearing 33 of the rotor output shaft 32 of the rotor 3 is housed is provided on one end surface (the lower surface in FIG. 1) of the stator 2. On the other end surface (upper surface in FIG. 1) of the stator 2, a circuit board 5 on which a control unit for driving the molded motor 1 is mounted is mounted, and a second bracket 42 is provided so as to cover it. Another bearing 34 is accommodated in the second bracket 42.

  In the present invention, the rotor 3 includes a rotor output shaft 32 that is rotatably supported by the bearings 33 and 34, a disk-shaped back yoke 35 that is coaxially attached to the rotor output shaft 32, and the back yoke. And a plurality of plate-like rotor magnets 31 arranged on the outer diameter side of 35. Both ends of the stator 2 and the rotor 3 are covered with brackets 41 and 42. In the present invention, the configurations of the stator 2, the rotor 3, and the brackets 41 and 42 are optional items, and the specific form thereof may be arbitrarily changed according to the specifications.

  A bushing 6 is provided between the stator 2 and the second bracket 42 for drawing out the lead wire 51 connected to the circuit board 5 to the outside. In describing the configuration of the bushing 6, the configuration on the side of the stator 2 to which the bushing 6 is attached will be described.

  As shown in FIGS. 2 and 5, a notch 23 to which the bushing 6 is attached is provided on the outer peripheral side of the other end surface (the upper surface in FIG. 1) of the stator 2. The notch 23 is notched with a predetermined opening width from the outer periphery of the stator 2 toward the inside (see FIG. 5). A locking rib 231 that fits into a locking groove 671 of the bushing 6 to be described later is provided at the bottom of the notch 23.

  The both side walls 232 and 232 of the notch 23 are adapted to support both ends of the bushing 6 by fitting into the notches 68 and 68 formed at both ends of the bushing 6 shown in FIG.

  The stator 2 is provided with an escape portion 233 for preventing the thin hinge 63 connecting the holding pieces 61 and 62 from interfering with the stator 2 when the bushing 6 is attached.

  The escape portion 233 is a portion where the portion where the thin hinge 63 is disposed is recessed toward the outer diameter side (thickened), and in this example, adjacent to one side wall 232 (right side in FIG. 2). Is provided. In addition, as long as the escape part 233 is provided in the position which opposes 63 to a thin hinge, the position may be changed arbitrarily according to a specification.

  As shown in FIGS. 3 and 4, the bushing 6 has a pair of holding pieces 61 and 62 that hold the lead wire 51 therebetween, and these are integrally connected via a thin hinge 63. In this example, the bushing 6 is formed of an integrally molded synthetic resin product having insulating properties.

  Each holding piece 61, 62 has contact surfaces 69, 69 that come into contact with each other when the holding pieces 61, 62 face each other, both sides of an introduction portion 64 and a holding portion 65, which will be described later, and a cover surface 621. The abutting surfaces 69 are brought into close contact with each other so that the lead wire 51 is held by the introduction portion 64 and the holding portion 65. In the following, the contact surface on the one holding piece 61 (hereinafter referred to as the first holding piece 61) side is the first contact surface 69a, and the other holding piece 62 (hereinafter referred to as the second holding piece 62 side) is the contact surface. The second contact surface 69b will be described.

  As shown in FIG. 3A, on the surface (front surface) shown in FIG. 3A of the first holding piece 61, an introduction portion 64 for drawing the lead wire 51 into the holding piece 61, and an introduction portion 64. A holding portion 65 for holding the lead wire 51 drawn from and a first contact surface 69a are provided. On the back surface (the surface shown in FIG. 4B) of the first holding piece 61, a stator attachment portion 67 for attaching a bushing 6 described later to the stator 2 is provided.

  The introduction portion 64 is formed of a concave portion that is formed one step lower in the plate thickness direction from the first contact surface 69a, and its opening width is from one end (the upper end in FIG. 4A) to the other end (in FIG. 4A). It is formed so as to gradually become narrower toward the holding portion 65 at the lower end.

  The opening width W1 on the inlet side of the introduction part 64 is designed to be larger than the opening width W2 on the outlet side of the holding part 65 described later (W1> W2).

  According to this, since the opening width W1 on the inlet side is formed wider than the opening width W2 on the outlet side of the holding portion 65, the holding pieces 61 and 62 face each other and the lead wire 51 is sandwiched therebetween. At this time, it is possible to prevent the lead wire 51 from being caught between the contact surfaces 69a and 69b in the section from the inlet of the introduction part 64 to the inlet of the holding part 65.

  Next, the holding portion 65 includes a holding groove 651 having one end opened toward the introduction portion 64 and the other end opened toward the other end of the first holding piece 61 (the lower end in FIG. 4A). . In this example, five holding grooves 651 are provided in parallel to each other, but the number thereof may be arbitrary depending on use. In this example, the holding portion 65 uses a holding groove 651 that holds the lead wires 51 one by one, but it is only necessary to have a structure that can hold the lead wires 51 from both sides.

  The first abutment surface 69 a of the first holding piece 61 is provided with receiving holes 66 b and 66 b that constitute one of the fixing means 66. The receiving holes 66b, 66b are provided as a pair at positions that are symmetrical with respect to the holding portion 65. In this example, the inlet side (upper side in FIG. 3A) and the outlet side of the holding portion 65 are provided. (Lower in FIG. 3 (a)), two locations are provided, and four locations are provided on both the left and right sides.

  With reference to FIG. 2 and FIG. 4B, a stator attachment portion 67 for attaching the bushing 6 to the stator 2 is provided on the back surface side of the first holding piece 61. The stator attachment portion 67 includes a locking groove 671 fitted into a locking rib 231 provided on the stator 2 side, and a locking projection 672 arranged along the locking groove 671.

  The locking groove 671 is a groove cut out toward both ends in the width direction of the first holding piece 61, has substantially the same cross-sectional shape as the locking rib 231 to be fitted, and has an arc shape with a predetermined curvature. Is formed.

  The locking projection 672 protrudes from the back surface of the first holding piece 61 so as to have a predetermined height, and has an arc shape so that the inner peripheral surface 672 a abuts along the outer peripheral surface of the locking rib 231. Is formed.

  On both side surfaces of the first holding piece 61 (both left and right in FIG. 3A), notches 68 and 68 that fit into the side wall surfaces 232 and 232 of the stator 2 described above are provided. The notches 68 and 68 are U-shaped grooves that conform in shape along the side wall surfaces 232 and 232 of the stator 2. According to this, the bushing 6 is securely fixed to the stator 2 by fitting each side wall surface 232 into each notch 68.

  Referring to FIGS. 3 and 4 again, the second holding piece 62 has substantially the same outer shape as the first holding piece 61 described above, and a lead wire 51 is provided on the surface (front surface) shown in FIG. A cover surface 621 and a second contact surface 69b are provided. On both side surfaces of the second holding piece 62, fitting grooves 623 and 623 for a bracket to be described later are formed.

  The cover surface 621 is formed so as to cover the entire surface of the first holding piece 61 from the introduction portion 64 to the holding portion 65, and is formed of a concave portion formed one step lower in the plate thickness direction than the second contact surface 69b.

  Locking convex portions 622 for pressing a part of the lead wire 51 are provided at five positions in this example at positions facing the holding portion 65 of the cover surface 621. The locking convex portion 622 protrudes into the holding groove 651 of the holding portion 65, and by pressing a part of the peripheral surface of the lead wire 51 accommodated in the holding groove 651, the lead wire 51 is pressed. It can be firmly held in the holding groove 651.

  The second holding piece 62 is provided with a boss 66 a to be inserted into the receiving hole 66 b of the fixing means 66 provided on the first holding piece 61. The boss 66a has a cylindrical shape protruding from the second contact surface 69b of the second holding piece 62, and has at least an outer diameter and a length that can be embedded in the receiving hole 66b.

  The fitting grooves 623 and 623 are inserted along the edges of notch portions (not shown) provided on the bracket 42 side, and by inserting a part of the bracket 42 into the fitting grooves 623 and 623, As shown in FIG. 1B, the bushing 6 is held between the stator 2 and the bracket 42.

As shown in FIGS. 5 and 6, when attaching the bushing 6 to the stator 2, the bushing 6 can be easily attached by fitting the locking groove 671 of the first holding piece 61 to the locking projection 231 of the stator 2. Can do.

  After the first holding piece 61 is attached, the lead wire 51 drawn out from the circuit board 5 is inserted into each holding groove 651 through the introduction portion 64. After that, the second holding piece 62 connected by the thin hinge 63 is overlapped with the first holding piece 61, and the boss 66a is inserted into the receiving hole 66b and fixed. In this embodiment, the boss 66a is provided in the second holding piece 62, and the receiving hole 66b is provided in the first holding piece 61. Therefore, when the lead wire 51 is pushed into the holding groove 651, the operator Since the finger does not hit the boss 66a and the push operation of the lead wire 51 is not hindered, the work of pushing the lead wire 51 into the holding groove 651 can be easily performed.

  Next, the bushing 6A according to the second embodiment will be described with reference to FIGS. 7 and 8. Parts that are considered to be the same as or the same as the bushing 6 of the first embodiment described above are denoted by the same reference numerals. The description is omitted.

The bushing 6A of the second embodiment is provided with a pair of left and right guide bosses 641 and 641 for defining the opening width on the inlet side of the introduction portion 64 formed in the first holding piece 61. The guide bosses 641 are arranged symmetrically with respect to both ends (upper ends in FIG. 8A) on the inlet side of the introduction portion 64.

  Also in the second embodiment, the opening width W1 on the inlet side of the introduction portion defined by the guide bosses 641 and 641 is larger than the opening width W2 on the outlet side of the holding portion 65 (W1> W2). Has been placed. The guide bosses 641 and 641 are designed so that their height is equal to or greater than the outer diameter of the lead wire 51. Then, when covered by the second holding piece 62, the tip of the guide boss 641 comes into contact with the cover surface 621.

  According to this, the space between the guide bosses 641 and 641 is widely secured as the entrance of the lead wire 51 introduction portion. Furthermore, when the holding pieces 61 and 62 are overlapped with each other, the leading ends of the guide bosses 641 and 641 come into contact with the cover surface 621, so that the lead wire 51 does not get over the guide boss 641 and come off. It is possible to prevent the lead wire 51 from being caught between the contact surfaces 69a and 69b.

  In the second embodiment, the cover surface 621 of the second holding piece 62 is basically formed as a flat concave surface as in the first embodiment, but the guide boss 641 is located at a position facing each of the bosses 641 and 641. , 641 may be formed with at least a tip portion. Alternatively, a convex portion may be formed on the cover surface 621 facing the guide boss 641 so that the tip of the convex portion and the tip of the guide boss 641 abut.

  As described above, according to the present invention, the opening width W1 on the inlet side of the introduction portion 64 of the first holding piece 61 is larger than the opening width W2 on the outlet side of the holding portion 65 (W1> W2). By being designed, when the holding pieces 61 and 62 face each other and the lead wire 51 is sandwiched and held, the lead wire 51 can be prevented from being caught on the inlet side of the introduction portion 64.

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Stator 21 Stator core 22 Teeth surface 23 Notch part 231 Locking rib 3 Rotor 41, 42 Bracket 5 Circuit board 51 Lead wire 6 Bushing 61 1st holding piece 62 2nd holding piece 63 Thin hinge 64 Introduction part 641 Guide boss 65 Holding portion 651 Holding groove 66a Boss 66b Receiving hole 67 Stator mounting portion 68 Notch portion 69 Contact surface 69a First contact surface 69b Second contact surface

Claims (2)

In an electric motor in which lead wires connected to the circuit board are drawn out through a bushing from the inside of a housing including a stator on which a predetermined circuit board is mounted and a bracket attached to the stator.
The bushing has a pair of holding pieces that sandwich and hold the lead wire from both sides, and at least one of the holding pieces introduces the lead wire into the holding piece from the inside of the housing. And a holding portion for holding the lead wire guided from the introduction portion, and the holding pieces are fixed to the opposing surfaces of the holding pieces in a state of facing each other. fixing means are provided, the inlet side of the opening width of the inlet portion of the holding piece W1, a W 1> W2 can and the outlet side of the opening width of the holding portion of the holding piece was W2,
A pair of guide bosses defining the opening width W1 are disposed on both sides of the introduction portion on the inlet side of the introduction portion of the holding piece, and the guide boss has a height that is the outer diameter of the lead wire. An electric motor characterized in that the tip is in contact with the other holding piece . Each holding piece is openably connected through a thin hinge, the said stay data, relief portion for said thin hinge does not interfere with the stator is provided in mounting the bushing The electric motor according to claim 1, wherein the electric motor is provided.

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