WO2020075859A1

WO2020075859A1 - Motor

Info

Publication number: WO2020075859A1
Application number: PCT/JP2019/040327
Authority: WO
Inventors: 健吉沢
Original assignee: ミネベアミツミ株式会社
Priority date: 2018-10-12
Filing date: 2019-10-11
Publication date: 2020-04-16
Also published as: JP7245024B2; JP2020061914A; CN112789791A

Abstract

Provided is a motor which is small and inexpensive and with which it is possible to improve workability during assembly. The motor (1) is provided with a motor body portion (10) having a lead-out portion (12) for leading out a lead wire (11) and a grommet (30) for sealing the lead-out portion (12) of the motor body portion (10). The grommet (30) has a through-hole (42) for holding the lead wire (11) of the motor body portion (10) and a cut portion (44) serving as a separation portion for opening the through-hole (42).

Description

motor

The present invention relates to a motor.

Conventionally, motors such as hybrid type stepping motors have been used for various purposes. In such a motor, when it is used for the purpose of being exposed to impurities such as dust and liquid, in order to prevent malfunctions due to impurities from the outside, for example, a lead-out portion that is the outlet of the lead wire. Are protected by grommets, etc. In such a motor, for example, a lead wire lead-out portion in a housing of the motor is hermetically sealed by a three-body structure of a grommet, a tube, and a cover (see, for example, Patent Document 1).

JP, 2010-17034, A

In such a conventional motor, when a detection device such as an encoder (position detector) is attached, it is necessary to hermetically seal the two extraction parts of the motor and the detection device. There is a possibility that the structure becomes complicated and the workability at the time of assembly is reduced. Also, when the lead wires of the motor and the encoder are separately sealed, the size of the motor becomes large.

Further, when the lead wire is a PVC shield wire to seal the lead portion and the grommet and the cover are attached to the PVC shield wire, the PVC shield wire is expensive and the motor is expensive, and the PVC shield wire is also expensive. Since it is hard, the workability during assembly may decrease. As described above, the conventional motor has been required to have a structure that is small in size, inexpensive, and capable of improving workability during assembly.

The present invention has been made in view of the above problems, and an object thereof is to provide a motor that is small in size, inexpensive, and capable of improving workability during assembly.

In order to achieve the above object, a motor device according to the present invention includes a motor main body having a lead-out portion for drawing out a lead wire, and a grommet that closes the lead-out portion of the motor main body, and the grommet is the motor main body. A through hole for holding the lead wire of the part and a separating part for opening the through hole.

Further, in the motor according to the present invention, the grommet is a lead wire holding grommet having the through hole and the separated portion, and the lead wire holding grommet is fitted to the motor body portion. It has a fixed grommet for fixing between.

Further, in the motor according to the present invention, the fixed grommet has an accommodating portion that accommodates the lead wire of the motor main body.

Further, in the motor according to the present invention, the fixed grommet has a plate-shaped portion and a side wall erected from the plate-shaped portion of the fixed grommet, and the lead wire holding grommet has one of the side walls. The fixed grommet is fitted into the fixed grommet.

Further, in the motor according to the present invention, the grommet further includes at least one detection device that is attached to the motor main body and has a lead-out portion that draws out a lead wire. The lead wire holding grommet holds both the lead wire of the motor body and the lead wire of the detection device.

In addition, in the motor according to the present invention, the lead wire of the motor main body and the lead wire of the detection device are bundled and covered with a tubular body.

Further, in the motor according to the present invention, the separation portion is a cut portion extending from the outer surface of the grommet to the through hole.

Further, in the motor according to the present invention, the separating portion is in contact with the outer surface of the motor main body portion.

Further, in the motor according to the present invention, the separating portion is a cut portion extending from the side surface of the lead wire holding grommet to the through hole.

Further, in the motor according to the present invention, a cover for fixing the grommet to the motor main body is further provided, and the cover has a plate-shaped portion and a leg portion erected from the plate-shaped portion of the cover. The height of the side wall of the fixed grommet and the height of the leg portion of the cover are fixed such that the fixed grommet is fixed to the motor main body and the fixed grommet is fixed to the motor main body. Not in the non-fixed state.

Further, in the motor according to the present invention, the height of the side wall of the fixed grommet is substantially equal to the height of the leg portion of the cover in a fixed state where the fixed grommet is fixed to the motor main body. In the non-fixed state where the fixed grommet is not fixed to the motor body, it is higher than the height of the leg portion of the cover.

According to the motor of the present invention, it is small and inexpensive, and the workability at the time of assembly can be improved.

It is a perspective view which shows roughly the structure of the motor which concerns on embodiment of this invention. It is an exploded perspective view which shows roughly the structure of the motor which concerns on embodiment of this invention. It is an exploded perspective view which shows roughly the structure of the motor which concerns on embodiment of this invention. FIG. 4A is a perspective view schematically showing the configuration of a lead wire holding grommet of the motor according to the embodiment of the present invention, and FIG. 4B is a schematic view of the configuration of the lead wire holding grommet. It is a front view shown. FIG. 5 (a) is a perspective view schematically showing the structure of a fixed grommet of the motor according to the embodiment of the present invention, and FIG. 5 (b) is a front view schematically showing the structure of the fixed grommet. Yes, FIG. 5C is a bottom view schematically showing the configuration of the fixed grommet 50. FIG. 6A is a perspective view schematically showing the configuration of the motor cover according to the embodiment of the present invention, and FIG. 6B is a front view schematically showing the configuration of the cover. It is a figure for demonstrating the assembly method which assembles the lead wire of the motor which concerns on embodiment of this invention. It is a figure for demonstrating the assembly method which assembles the lead wire of the motor which concerns on embodiment of this invention. It is a figure for demonstrating the attachment method which attaches the lead wire holding grommet of the motor which concerns on embodiment of this invention to a lead wire. It is a figure for demonstrating the attachment method which attaches the fixed grommet and cover of the motor which concern on embodiment of this invention to a motor main-body part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view schematically showing the configuration of a motor 1 according to an embodiment of the present invention, and FIGS. 2 and 3 are exploded perspective views schematically showing the configuration of the motor 1. Hereinafter, for convenience of explanation, the height direction of the motor 1 in FIG. 1 will be referred to as an arrow ab direction, the arrow a direction will be an upper side, and the arrow b direction will be a lower side. Further, the width direction of the motor 1 in FIG. 1 is the arrow cd direction, the arrow c direction is the left side, and the arrow d direction is the right side. Further, the axis X1 direction of the motor output shaft 2 of the motor 1 in FIG. 1 is the ef direction, the arrow e direction is the front side, and the arrow f direction is the rear side. In the following description, when describing the positional relationship and direction of each member using up, down, left, right, front and rear, only the positional relationship and direction in the drawings are shown, and the positional relationship and direction when incorporated in an actual device are shown. Not a thing.

The motor 1 according to the embodiment of the present invention includes a motor main body 10 having a lead-out portion 12 for pulling out a lead wire 11, and a grommet 30 for closing the lead-out portion 12 of the motor main body 10. The grommet 30 is a motor main body. The portion 10 has a through hole 42 for holding the lead wire 11 and a notch portion 44 as a separating portion for opening the through hole 42. Hereinafter, the configuration of the motor 1 will be specifically described.

As shown in FIG. 1, the motor 1 is formed in, for example, a rectangular parallelepiped shape or a substantially rectangular parallelepiped shape, and the motor output shaft 2 extends from the center or substantially the center of the motor 1 to the front side (arrow e direction). The motor 1 has a motor main body 10 having a motor output shaft 2, and a position detector 20 as an encoder that is attached to the rear side of the motor main body 10 (direction of arrow f). Further, the motor 1 is configured such that the grommet 30 and the cover 60 are attached by screws 70 on the upper side (direction of arrow a).

A drive signal or electricity is supplied to the motor 1 via a lead wire 3 drawn out from the grommet 30, and the motor output shaft 2 of the motor 1 is rotated by this drive signal or electricity. As the motor 1, for example, a stepping motor, a DC motor, a DC brushless motor, or the like can be used. The motor 1 may be an AC motor.

In the motor 1, on the upper surface (in the direction of arrow a) of the motor main body 10, as shown in FIGS. It is provided on the edge portion in the direction of arrow f). A thread groove hole 13c and a thread groove hole 13d having a thread groove corresponding to the thread groove of the screw 70 are formed on the left side (direction of arrow c) and the right side (direction of arrow d) of the drawer portion 12. Further, in the motor 1, a rectangular or substantially rectangular lead-out portion 22 for pulling out the lead wire 21 is provided on the upper surface (in the direction of arrow a) of the encoder 20 at the edge portion on the rear side (in the direction of arrow f). are doing. The

lead wires

11 and 21 are formed of inexpensive lead wires such as vinyl heat resistant single wire electric wires.

The lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 are bundled together and covered with the heat-shrinkable tube 4 that is a tubular body. The lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 covered with the heat-shrinkable tube 4 are drawn out from the grommet 30 as the lead wire 3 (FIG. 1). On the front side (arrow e direction) and the rear side (arrow f direction) of the heat-shrinkable tube 4, the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 which are bundled and twisted are fixed by tightening. A front fixture 5e and a rear fixture 5f (Fig. 7) are provided.

In the motor 1, the grommet 30 blocks both the drawer 12 of the motor body 10 and the drawer 22 of the encoder 20. In other words, the grommet 30 integrally covers and seals the lead-out portion 12 of the motor main end portion 10 and the lead-out portion 22 of the encoder 20. The grommet 30 is formed of, for example, an elastic body such as silicon rubber. The grommet 30 has a through hole 42 that holds both the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 and is drawn out to the outside, and a lead portion having a notch portion 44 as a separating portion that opens the through hole 42. A wire holding grommet 40, and a fixed grommet 50 having groove portions (left side groove portion 51c, right side groove portion 51d) which are fitted to the lead wire holding grommet 40 and fix the lead wire holding grommet 40 to the motor body portion 10. are doing.

FIG. 4A is a perspective view schematically showing the configuration of the lead wire holding grommet 40 of the motor 1 according to the embodiment of the present invention, and FIG. 4B shows the configuration of the lead wire holding grommet 40. It is a front view showing roughly. In the grommet 30, the lead wire holding grommet 40 has a square plate-shaped or substantially square plate-shaped plate-shaped portion 41, and a through hole 42 that penetrates the plate-shaped portion 41 in the axis X1 direction (arrow ef direction). It is formed above the center of the lead wire holding grommet 40 (in the direction of arrow a). The diameter of the through hole 42 is slightly smaller than the diameter of the lead wire 3. The through hole 42 may be located below the center of the lead wire holding grommet 40, and may be located at any position of the lead wire holding grommet 40.

In addition, the lead wire holding grommet 40 includes a left side flange portion 43c protruding leftward (direction of arrow c) from a left side (direction of arrow c) of the plate-like portion 41 and a right side of the plate-like portion 41 (direction of arrow d). It has a right side flange portion 43d protruding rightward (in the direction of arrow d) from the surface. The left side flange portion 43c and the right side flange portion 43d have the same or substantially the same shape.

The rear surface (in the direction of arrow f) of the left side flange portion 43c and the right side flange portion 43d is flush with the rear surface (in the direction of arrow f) of the plate-like portion 41. The height of the left flange portion 43c and the right flange portion 43d in the height direction (arrow ab direction) is the same as or substantially the same as the height of the plate-shaped portion 41 in the height direction (arrow ab direction).

The lead wire holding grommet 40 has a notch 44 extending from the side surface of the lead wire holding grommet 40 to the through hole 42. In the lead wire holding grommet 40, the notch 44 is located at the center or substantially the center of the through hole 42 in the height direction (arrow ab direction) from the side surface on the right side (arrow d direction) of the right side flange 43d to the right side of the through hole 42. It extends in a predetermined width in parallel or substantially parallel to the width direction (arrow cd direction) toward the inner peripheral surface (arrow d direction). The notch 44 may be located above or below the center of the through hole 42, and may be located at any position that opens the through hole 42. Further, the extending direction of the notch 44 is not limited to the direction along the width direction. As will be described later, the cutout portion 44 may have any shape as long as it is in close contact with the motor 1.

FIG. 5A is a perspective view schematically showing the configuration of the fixed grommet 50 of the motor 1 according to the embodiment of the present invention, and FIG. 5B is a schematic view of the configuration of the fixed grommet 50. FIG. 5C is a front view, and FIG. 5C is a bottom view schematically showing the configuration of the fixed grommet 50. The fixed grommet 50 has a housing portion (housing recess 52) for housing the lead wire 11 of the motor body 10. Further, the fixed grommet 50 has a plate-shaped portion 53 and side walls (left side wall 54c, right side wall 54d, front side wall 54e, rear side wall 54f) provided upright from the plate-shaped portion 53 of the fixed grommet 50. The lead wire holding grommet 40 is fitted into the groove portions (the left side groove portion 51c and the right side groove portion 51d) so as to be a part of the side wall (front side wall 54e).

Specifically, the fixed grommet 50 is a rectangular parallelepiped-shaped or substantially rectangular parallelepiped-shaped recess having a predetermined depth formed so as to be able to accommodate the lead wire 3 (the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20). The accommodation recess 52 is formed. The width in the width direction (arrow cd direction) of the housing recess 52 is larger than the width in the width direction (arrow cd direction) of the drawer 12 of the motor body 10 and the drawer 22 of the encoder 20. Covers the drawer 12 of the motor body 10 and the drawer 22 of the encoder 20.

In addition, the fixed grommet 50 has a square plate-shaped or substantially square plate-shaped plate-shaped portion 53 and an edge portion on the left side (direction of arrow c) of the plate-shaped portion 53, below the plate-shaped portion 53 (direction of arrow b). Has a left side wall 54c extending in a direction parallel to or substantially parallel to the height direction (arrow ab direction) from the surface of FIG. In addition, the fixed grommet 50 has a height from the lower surface (direction of arrow b) of the plate-like portion 53 toward the lower side (direction of arrow b) at the right edge (direction of arrow d) of the plate-like portion 53. It has a right side wall 54d extending parallel or substantially parallel to the direction (arrow ab direction).

The left side wall 54c and the right side wall 54d are located at the center or substantially the center in the axis X1 direction (arrow ef direction), respectively, from the upper side (arrow a direction) of the left side wall 54c and right side 54d to the lower side (arrow b direction). Has a through hole 55c and a through hole 55d penetrating toward the surface. The through hole 55c and the through hole 55d are formed at positions corresponding to the screw groove hole 13c and the screw groove hole 13d of the motor main body 10, respectively, and the screw 70 is inserted therethrough.

Further, the fixed grommet 50 has a height from the lower surface of the plate-shaped portion 53 (direction of arrow b) toward the lower side (direction of arrow b) at the edge portion on the front side (direction of arrow e) of the plate-shaped portion 53. It has a front side wall 54e extending parallel or substantially parallel to the direction (arrow ab direction). The front side wall 54e has a square shape in a front view extending from the lower surface (direction of the arrow b) of the front side wall 54e toward the surface of the upper side (direction of the arrow a) at the center or substantially the center in the width direction (direction of the arrow cd) or It has a substantially square opening 56.

The height in the height direction (arrow ab direction) and the width in the width direction (arrow cd direction) of the opening 56 are the height in the height direction (arrow ab direction) of the plate-like portion 41 of the lead wire holding grommet 40 and It is smaller than the width in the width direction (arrow cd direction). As a result, the plate-shaped portion 41 is compressed in the height direction and the width direction when the lead wire holding grommet 40 is attached to the fixed grommet 50 and the grommet 30 is attached to the motor body 10, as described later. It The openings 56 are respectively located at the center or substantially the center in the direction of the axis X1 (direction of arrow ef) from the left side (direction of arrow c) and the right side (direction of arrow d) to the left side (direction of arrow c) and the right side (arrow d), respectively. It has a left side groove portion 51c and a right side groove portion 51d which are recessed in the direction). The left side groove portion 51c and the right side groove portion 51d extend in a predetermined length in parallel or substantially in parallel with the axis X1 direction (arrow ef direction).

The width of the left groove portion 51c in the width direction (arrow cd direction) and the length in the axis X1 direction (arrow ef direction) are the width of the left flange portion 43c in the width direction (arrow cd direction) and the axis X1 direction (arrow ef direction). The length is smaller than the length of the left side flange portion 43c, and the left side flange portion 43c fits into the left side groove portion 51c. The width of the right groove portion 51d in the width direction (arrow cd direction) and the length in the axis X1 direction (arrow ef direction) are the width of the right flange portion 43d in the width direction (arrow cd direction) and the axis X1 direction (arrow ef direction). The length is smaller than the length of the right side flange portion 43d, and the right side flange portion 43d is fitted in the right side groove portion 51d.

In addition, the fixed grommet 50 is arranged such that the edge of the plate-shaped portion 53 on the rear side (the arrow f direction) is elevated from the surface on the lower side (the arrow b direction) of the plate-shaped portion 53 toward the lower side (the arrow b direction). It has a rear side wall 54f extending parallel or substantially parallel to the depth direction (arrow ab direction).

FIG. 6A is a perspective view schematically showing the configuration of the cover 60 of the motor 1 according to the embodiment of the present invention, and FIG. 6B is a front view schematically showing the configuration of the cover 60. Is. The cover 60 fixes the lead wire holding grommet 40 and the fixed grommet 50 on the upper side (in the direction of arrow a) of the motor body 10. The cover 60 has a plate-shaped portion 61 and leg portions (left leg portion 63c, right leg portion 63d) provided upright from the plate-shaped portion 61 of the cover 60, and the side wall of the fixed grommet 50 (left side wall). The height H1 of the 54c and the right side wall 54d) is higher than the height H2 of the legs (the left leg 63c and the right leg 63d) of the cover 60.

In the cover 60, the plate portion 61 is formed in a square plate shape or a substantially square plate shape. The plate-shaped portion 61 has a center (or an arrow ef direction) in the axial line X1 direction (arrow ef direction), a left side (arrow c direction) and a right side (arrow d direction) edge portions at the lower side (upward direction). It has a through hole 62c and a through hole 62d penetrating toward the surface in the arrow b direction). The through hole 62c and the through hole 62d are formed at positions corresponding to the screw groove hole 13c and the screw groove hole 13d of the motor main body 10, respectively, and the screw 70 is inserted therethrough.

The length of the plate portion 61 in the axis X1 direction (arrow ef direction) is the same as or substantially the same as the width of the plate portion 53 in the axis X1 direction (arrow ef direction). The width of the plate portion 61 in the width direction (arrow cd direction) is slightly larger than the width of the plate portion 53 in the width direction (arrow cd direction).

In addition, the cover 60 has a left edge (direction of arrow c) of the plate-shaped portion 61 in a height direction from a lower surface (direction of arrow b) of the plate-shaped portion 61 toward a lower side (direction of arrow b). It has a left leg portion 63c extending in parallel or substantially parallel to the (arrow ab direction). In addition, the cover 60 has a right edge (direction of arrow d) of the plate-like portion 53, and a height direction from a lower surface (direction of arrow b) of the plate-like portion 61 toward a lower side (direction of arrow b). It has a right leg portion 63d extending parallel or substantially parallel to the (arrow ab direction).

The right leg 63d has the same or substantially the same shape as the left leg 63c. The length of the left leg portion 63c and the right leg portion 63d in the axis X1 direction (arrow ef direction) is the same or substantially the same as the length of the plate-shaped portion 61 in the axis X1 direction (arrow ef direction).

The heights of the left leg portion 63c and the right leg portion 63d in the height direction (arrow ab direction) are lower than the heights of the left side wall 54c and the right side wall 54d of the fixed grommet 50 in the height direction (arrow ab direction), respectively. Has become. The lengths of the left leg portion 63c and the right leg portion 63d in the axis X1 direction (arrow ef direction) are the same or substantially the same as the lengths of the left wall 54c and the right wall 54d in the axis X1 direction (arrow ef direction). There is.

The left leg portion 63c is arranged to be in close contact with the left side surface (direction of arrow c) of the left side wall 54c, and the right side leg portion 63d is arranged to be in close contact with the right side surface (direction of arrow d) of the right side wall 54d. Has become. The height H2 in the height direction (arrow ab direction) of the left leg portion 63c and the right leg portion 63d is the height H1 in the height direction (arrow ab direction) of the left side wall 54c and the right side wall 54d of the fixed grommet 50, respectively. Is lower than.

Next, a method for assembling the motor 1 having the above-described configuration will be described. 7 and 8 are views for explaining an assembling method for assembling the lead wire 3 of the motor 1 according to the embodiment of the present invention. FIG. 9 is a diagram for explaining an attachment method for attaching the lead wire holding grommet 40 of the motor 1 to the lead wire 3, and FIG. 10 is an attachment for attaching the fixed grommet 50 and the cover 60 of the motor 1 to the motor body 10. It is a figure for demonstrating a method.

First, as shown in FIG. 7, the lead wire 11 pulled out from the lead-out portion 12 of the motor main body portion 10 and the lead wire 21 pulled out from the lead-out portion 22 of the encoder 20 are bundled into one and are connected to each other. In the vicinity of the front side (direction of arrow e), the rear side fixing tool 5f is tightened and fixed. After that, the bundled

lead wires

11 and 21 are twisted by a predetermined length on the front side (in the direction of arrow e) with respect to the rear side fixing tool 5f, and the twisted tip portion is tightened and fixed by the front side fixing tool 5e. To be done.

When the

lead wires

11 and 21 are fixed by the front fixing tool 5e and the rear fixing tool 5f, the twisted lead wire 11 between the front fixing tool 5e and the rear fixing tool 5f, as shown in FIG. A sheet-shaped heat-shrinkable tube 4 is wound around the outer periphery of 21 and is temporarily fixed with a tape. Then, the wound heat-shrinkable tube 4 is shrunk by hot air or the like, and the tape is removed. Thereby, the twisted lead wires 11 and 21 (lead wire 3) between the front fixture 5e and the rear fixture 5f are covered with the heat-shrinkable tube 4. The lead wire 3 may be covered with a tubular body other than the heat-shrinkable tube 4.

When the lead wires 11 and 21 (lead wire 3) are covered with the heat-shrinkable tube 4, as shown in FIG. 9, they are covered with the heat-shrinkable tube 4 between the front fixture 5e and the rear fixture 5f. The lead wires 11 and 21 (lead wire 3) are attached to the lead wire holding grommet 40 through the notches 44 of the lead wire holding grommet 40. Since the diameter of the through hole 42 of the lead wire holding grommet 40 is slightly smaller than the diameter of the lead wire 3 and the lead wires 11 and 21 (lead wire 3) are covered with the heat shrinkable tube 4, the lead wire. The through hole 42 of the holding grommet 40 and the lead wires 11 and 21 (lead wire 3) are in close contact with each other.

After that, as shown in FIG. 10, the left side flange portion 43c of the lead wire holding grommet 40 is fitted into the left side groove portion 51c of the fixed grommet 50, and the right side flange portion 43d of the lead wire holding grommet 40 is right side of the fixed grommet 50. It is fitted in the groove portion 51d. Thereby, the lead wire holding grommet 40 is attached so as to be a part of the front side wall 54e of the fixed grommet 50. As described above, since the shape of the plate-shaped portion 41 of the lead wire holding grommet 40 is larger than the shape of the opening 56 of the fixed grommet 50, the plate-shaped portion 41 of the lead wire holding grommet 40 and the fixed grommet 50 are formed. The opening 56 and the opening 56 are in close contact with each other.

After that, the cover 60 is attached to the fixed grommet 50 and screwed with the screw 70, so that the fixed grommet 50 and the cover 60 are attached to the motor body 10. Before the cover 60 is attached to the fixed grommet 50 and screwed by the screw 70, the height H1 of the left side wall 54c and the right side wall 54d of the fixed grommet 50 is the same as that of the left leg portion 63c and the right leg portion 63d of the cover 60. It is higher than the height H2.

After that, the fixed grommet 50 and the cover 60 are screwed with the screw 70 until the left leg portion 63c and the right leg portion 63d of the cover 60 come into contact with the motor body portion 10, thereby crushing the fixed grommet 50 and crushing the motor body portion 10. The fixed grommet 50 and the motor body 10 are firmly attached to each other. Further, the notches 44 of the lead wire holding grommet 40 are crushed to firmly adhere between the notches 44 of the lead wire holding grommet 40. After the cover 60 is attached to the fixed grommet 50 and screwed with the screw 70, the height H1 of the left side wall 54c and the right side wall 54d of the fixed grommet 50 is compressed, and the left leg 63c and the right leg of the cover 60 are compressed. The height is substantially the same as the height H2 of the portion 63d. That is, the height of the left side wall 54c and the right side wall 54d of the fixed grommet 50 and the height H2 of the left side leg 63c and the right side leg 63d of the cover 60 are in a fixed state in which the fixed grommet 50 is fixed to the motor body 10. The fixed grommet 50 is different from the unfixed state in which the fixed grommet 50 is not fixed to the motor body 10.

As described above, in the motor 1 according to the embodiment of the present invention, the grommet 30 includes the through hole 42 that holds the lead wire 11 of the motor body 10 and draws it to the outside, and the notch 44 that opens the through hole 42. A lead wire holding grommet 40, and a fixed grommet 50 having groove portions (left side groove portion 51c, right side groove portion 51d) that are fitted to the lead wire holding grommet 40 and fix the lead wire holding grommet 40 to the motor body 10. have. Therefore, the notch 44 of the lead wire holding grommet 40 is crushed and the notches 44 of the lead wire holding grommet 40 are firmly adhered. Since the lead wire 11 of the motor body 10 can be used to seal the lead-out portion 12 of the motor body 10 with the simple structure of the lead wire holding grommet 40 and the fixed grommet 50 without using a PVC shielded wire, the size is small. Moreover, the workability at the time of assembly can be improved at a low cost.

Specifically, in the motor 1, the lead wire 11 of the motor body and the lead wire 21 of the encoder 20 are pulled out from one place of the through hole 42 of the lead wire holding grommet 40 without separately pulling out, and thus the motor 1 is downsized. In addition, the number of parts can be reduced, and the workability at the time of assembling the motor 1 can be improved. Further, since the motor 1 uses an inexpensive and flexible vinyl heat resistant single wire wire or the like without using an expensive and hard PVC shield wire, the motor 1 can be made inexpensive, and workability at the time of assembling the motor 1 can be improved. Can be improved.

Further, in the motor 1, the fixed grommet 50 has a housing recess 52 that houses the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20, and the housing recess 52 is a drawer portion of the motor body 10. 12 and the drawer portion 22 of the encoder 20 are integrally covered. Further, the lead wire holding grommet 40 is fitted into the left side groove portion 51c and the right side groove portion 51d of the fixed grommet 50 so as to be a part of the front side wall 54e of the fixed grommet 50. For this reason, the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20 can be sealed with a simple structure of the lead wire holding grommet 40 and the fixed grommet 50. Can be improved.

Further, in the motor 1, the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 are bundled and twisted, and are covered with the heat shrinkable tube 4. Therefore, the through hole 42 of the lead wire holding grommet 40 and the lead wires 11 and 21 (lead wire 3) can be brought into close contact with each other.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and includes all aspects included in the concept and claims of the present invention. Further, the respective configurations may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, and the like of each component in the above-described embodiment can be appropriately changed depending on the specific usage of the present invention.

For example, in the motor 1, the embodiment of the present invention has been described by taking the case where the lead wire holding grommet 40 and the fixed grommet 50 are provided as separate bodies, but the present invention is not limited to this, and the lead wire is not limited thereto. The holding grommet 40 and the fixed grommet 50 may be integrated. In this case, for example, the notch 44 of the lead wire holding grommet 40 is below the portion corresponding to the plate-shaped portion 41 of the lead wire holding grommet 40 at the center or substantially the center of the through hole 42 in the width direction (arrow cd direction). From a surface on the side (direction of arrow b) toward the inner peripheral surface on the lower side (direction of arrow b) of the through hole 42 with a predetermined width in parallel or substantially parallel to the height direction (direction of arrow ab). Good. The extending direction of the cut portion 44 is not limited to this, and it is sufficient that the cut portion 44 extends between the through hole 42 and the lower surface (the arrow b direction side) of the grommet 30. In this case, the notch 44 is in contact with the outer surface of the motor body 10. The notch 44 is not limited to being in contact with the outer surface of the motor body 10, and may extend from the outer surface of the grommet 30 not in contact with the motor body 10 to the through hole 42.

The cut portion 44 is not limited to the processing method. The cut portion 44 may be provided by any method, and may be formed by various methods such as cut processing or integral formation by die molding.

In the motor 1, the embodiment of the present invention has been described by taking the case where the fixed grommet 50 is formed in a square shape or a substantially square shape as an example, but the present invention is not limited to this and, for example, the fixed grommet 50. May be formed into various shapes such as a cylindrical shape and a prismatic shape. Further, the motor 1 has a position detector 20 as an encoder mounted on the rear side (in the direction of arrow f) of the motor body 10 as a detection device. However, the present invention is not limited to this, and may be, for example, a detection device or an electronic device having a brake mechanism, a lock mechanism, or the like, and has two or more detection devices, and all the drawer units. May be integrally covered with a grommet to be hermetically sealed.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor output shaft, 3 ... Lead wire, 4 ... Heat shrink tube, 5 ... Fixing tool, 10 ... Motor main body part, 11 ... Lead wire, 12 ... Draw-out part, 13c, 13d ... Thread groove hole, 20 ... Encoder, 21 ... Lead wire, 22 ... Lead-out part, 30 ... Grommet, 40 ... Lead wire holding grommet, 41 ... Plate-shaped part, 42 ... Through hole, 43c ... Left flange part, 43d ... Right flange part, 44 ... Notch part, 50 ... Fixed grommet, 51c ... Left side groove part, 51d ... Right side groove part, 52 ... Receiving concave part, 53 ... Plate part, 54c ... Left side wall, 54d ... Right side wall, 54e ... Front side wall, 54f ... Rear side wall, 55c , 55d ... Through hole, 56 ... Opening portion, 60 ... Cover, 61 ... Plate portion, 62c, 62d ... Through hole, 63c ... Left leg portion, 63d ... Right leg portion, 70 ... Screw, X1 ... Axial direction

Claims

A motor body having a lead-out portion for pulling out the lead wire;
A grommet for closing the drawer of the motor body,
The grommet has a through hole that holds a lead wire of the motor main body and a spacing portion that opens the through hole.
The grommet includes a lead wire holding grommet having the through hole and the spacing portion, and a fixed grommet that fits with the lead wire holding grommet and fixes the lead wire holding grommet between the motor body. The motor according to claim 1, which has.
The motor according to claim 2, wherein the fixed grommet has an accommodating portion that accommodates a lead wire of the motor main body.
The fixed grommet has a plate-shaped portion and a side wall erected from the plate-shaped portion of the fixed grommet, and the lead wire holding grommet is attached to the fixed grommet so as to be a part of the side wall. The motor according to claim 2, wherein the motor is fitted.
Further comprising at least one detection device attached to the motor body and having a lead-out portion for pulling out a lead wire,
The grommet blocks both the drawer of the motor body and the drawer of the detection device,
The motor according to any one of claims 2 to 4, wherein the lead wire holding grommet holds both the lead wire of the motor main body and the lead wire of the detection device.
The motor according to claim 5, wherein the lead wire of the motor body and the lead wire of the detection device are bundled and covered with a tubular body.
The motor according to claim 1, wherein the spacing portion is a cut portion that extends from the outer surface of the grommet to the through hole.
The motor according to claim 7, wherein the separating portion is in contact with an outer surface of the motor main body portion.
The motor according to any one of claims 2 to 6, wherein the separating portion is a cut portion extending from a side surface of the lead wire holding grommet to the through hole.
Further comprising a cover for fixing the grommet to the motor body,
The cover has a plate-shaped portion and a leg portion provided upright from the plate-shaped portion of the cover,
The height of the side wall of the fixed grommet and the height of the leg portion of the cover are in a fixed state in which the fixed grommet is fixed to the motor main body, and the fixed grommet is not fixed to the motor main body. The motor according to claim 4, wherein the motor is different from the state.
The height of the side wall of the fixed grommet is substantially equal to the height of the leg portion of the cover in the fixed state where the fixed grommet is fixed to the motor main body portion, and the fixed grommet is the motor main body portion. 11. The motor according to claim 10, wherein the motor is higher than the height of the leg portion of the cover in a non-fixed state where the motor is not fixed to the motor.