Motor

Abstract

The present invention provides a motor which is small and inexpensive and can improve workability during assembly. The motor (1) comprises: a motor body (10) having a lead-out portion (12) for leading out a lead wire (11); and a grommet (30) for blocking the lead-out portion (12) of the motor body (10), the grommet (30) having a through hole (42) for holding the lead wire (11) of the motor body (10) and a cutout portion (44) as a separation portion for opening the through hole (42).

Description

Technical Field

[0001] The present invention relates to electric machines. Background Art

[0002] Motors such as hybrid stepping motors have been used for various purposes. In such motors, when used for purposes where they are exposed to impurities such as dust and liquid, in order to prevent malfunctions due to external impurities, the lead-out portion serving as the lead-out port is protected by, for example, a grommet or the like. In such motors, the lead-out portion on the motor housing is sealed by, for example, a three-body structure of a grommet, a tube, and a cover (see, for example, Patent Document 1).

[0003] (Prior art literature)

[0004] (Patent Document)

[0005] Patent document 1: Japanese Patent Application Publication No. 2010-17034. Summary of the invention

[0006] (Problem to be solved by the invention)

[0007] In such a conventional motor, when a detection device such as an encoder (position detector) is installed, the lead-out portions of the motor and the detection device must be sealed, which may complicate the structure for sealing the lead-out portions and reduce the workability during assembly. In addition, when the leads of the motor and the encoder are sealed separately, the motor will be larger.

[0008] When the lead wire is formed into a PVC shielded wire in order to seal the lead-out portion, and a grommet and a cover are installed on the PVC shielded wire, the price of the motor becomes high due to the high price of the PVC shielded wire, and the workability during assembly may be reduced due to the hardness of the PVC shielded wire. Therefore, a structure that is small and inexpensive and can improve the workability during assembly is required for the conventional motor.

[0009] The present invention has been developed in view of the above-mentioned problems, and an object of the present invention is to provide a motor which is small and inexpensive and can improve workability during assembly.

[0010] (Solutions used to solve problems)

[0011] In order to achieve the above-mentioned purpose, the motor device involved in the present invention is characterized in that it includes: a motor main body, which has a lead-out portion for leading out a lead wire; and a grommet, which blocks the lead-out portion of the motor main body, and the grommet has a through hole for holding the lead wire of the motor main body and a separation portion for opening the through hole.

[0012] Furthermore, in the motor according to the present invention, the grommet comprises: a lead wire holding grommet having the through hole and the separation portion; and a fixing grommet engaged with the lead wire holding grommet and fixing the lead wire holding grommet between the fixing grommet and the motor body.

[0013] Furthermore, in the motor according to the present invention, the fixing grommet has a receiving portion for receiving a lead wire of the motor main body.

[0014] Furthermore, in the motor according to the present invention, the fixing grommet has a plate-shaped portion and a side wall erected from the plate-shaped portion of the fixing grommet, and the lead wire holding grommet is fitted into the fixing grommet so as to become a part of the side wall.

[0015] In addition, the motor involved in the present invention also includes at least one detection device, which is installed on the motor main body and has a lead-out portion for leading out the lead wire. The grommet blocks both the lead-out portion of the motor main body and the lead-out portion of the detection device, and the lead wire holding grommet holds both the lead wire of the motor main body and the lead wire of the detection device.

[0016] Furthermore, in the motor according to the present invention, the lead wires of the motor main body and the lead wires of the detection device are bundled and covered by the cylindrical body.

[0017] Furthermore, in the motor according to the present invention, the separation portion is a cutout portion extending from an outer surface of the grommet to the through hole.

[0018] Furthermore, in the motor according to the present invention, the separation portion is in contact with an outer surface of the motor body portion.

[0019] Furthermore, in the motor according to the present invention, the separation portion is a cutout portion extending from a side surface of the lead wire holding grommet to the through hole.

[0020] In addition, the motor involved in the present invention also includes a cover for fixing the grommet to the motor main body, the cover having a plate-like portion and a leg portion erected from the plate-like portion of the cover, and the height of the side wall of the fixing grommet and the height of the leg portion of the cover are different in a fixed state where the fixing grommet is fixed to the motor main body and in a non-fixed state where the fixing grommet is not fixed to the motor main body.

[0021] In addition, in the motor involved in the present invention, when the fixing grommet is in a fixed state where the fixing grommet is fixed to the motor main body, the height of the side wall of the fixing grommet is substantially equal to the height of the leg of the cover, and when the fixing grommet is in a non-fixed state where the fixing grommet is not fixed to the motor main body, the height of the side wall of the fixing grommet is greater than the height of the leg of the cover.

[0022] (Effects of the Invention)

[0023] According to the motor according to the present invention, the motor is small and inexpensive, and the workability during assembly can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a perspective view schematically showing the structure of a motor according to an embodiment of the present invention.

[0025] Figure 2 It is an exploded perspective view schematically showing the structure of a motor according to an embodiment of the present invention.

[0026] Figure 3 It is an exploded perspective view schematically showing the structure of a motor according to an embodiment of the present invention.

[0027] Figure 4 (a) is a perspective view schematically showing the structure of a lead wire retaining grommet of a motor according to an embodiment of the present invention, Figure 4 (b) is a front view schematically showing the structure of the lead wire holding grommet.

[0028] Figure 5 (a) is a perspective view schematically showing the structure of a fixing grommet of a motor according to an embodiment of the present invention, Figure 5 (b) is a front view schematically showing the structure of the fixing grommet, Figure 5 (c) is a bottom view schematically showing the structure of the fixing grommet 50.

[0029] Figure 6 (a) is a perspective view schematically showing the structure of a cover of a motor according to an embodiment of the present invention, Figure 6 (b) is a front view schematically showing the structure of the cover.

[0030] Figure 7 It is a diagram for explaining a method of assembling lead wires of the motor according to the embodiment of the present invention.

[0031] Figure 8 It is a diagram for explaining a method of assembling lead wires of the motor according to the embodiment of the present invention.

[0032] Fig. 9 It is a diagram for explaining a method of attaching a lead wire holding grommet of a motor according to an embodiment of the present invention to a lead wire.

[0033] Fig.10 It is a diagram for explaining a method of attaching a fixing grommet and a cover of a motor according to an embodiment of the present invention to a motor body. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0035] Figure 1 is a perspective view schematically showing the structure of a motor 1 according to an embodiment of the present invention. Figure 2 and Figure 3 1 is an exploded perspective view schematically showing the structure of the motor 1. Figure 1 The height direction of the motor 1 in the figure is set as the arrow ab direction, the arrow a direction is set as the upper side, and the arrow b direction is set as the lower side. Figure 1 The width direction of the motor 1 in the figure is set as the direction of arrow cd, the direction of arrow c is set as the left side, and the direction of arrow d is set as the right side. Figure 1 The axis X1 direction of the motor output shaft 2 of the motor 1 is set as the ef direction, the arrow e direction is set as the front side, and the arrow f direction is set as the rear side. In the following description, when the positional relationship and direction of each component are described using up, down, left, right, front and back, it only represents the positional relationship and direction in the drawings, and does not represent the positional relationship and direction when actually assembled to the device.

[0036] The motor 1 according to the embodiment of the present invention includes: a motor body 10 having a lead-out portion 12 for leading out a lead wire 11; and a grommet 30 for blocking the lead-out portion 12 of the motor body 10, the grommet 30 having a through hole 42 for holding the lead wire 11 of the motor body 10 and a cutout portion 44 as a separation portion for opening the through hole 42. The configuration of the motor 1 will be described in detail below.

[0037] like Figure 1 As shown, the motor 1 is formed into a rectangular parallelepiped or substantially rectangular parallelepiped shape, and the motor output shaft 2 extends from the center or substantially the center of the motor 1 toward the front side (arrow e direction). The motor 1 includes: a motor body 10, which has the motor output shaft 2; and a position detector 20 as an encoder, which is a detection device installed on the rear side of the motor body 10 (arrow f direction). In addition, the motor 1 is configured such that the grommet 30 and the cover 60 are installed on the upper side (arrow a direction) by screws 70.

[0038] A drive signal or power is supplied to the motor 1 via the lead wire 3 led out from the grommet 30, and the drive signal or power rotates the motor output shaft 2 of the motor 1. As the motor 1, for example, a stepping motor, a DC motor, and a DC brushless motor can be used. The motor 1 may also be an AC motor.

[0039] In motor 1, if Figure 2 and Figure 3As shown, a rectangular or substantially rectangular lead-out portion 12 for leading out a lead wire 11 is provided on the upper side (arrow a direction) and at the edge of the rear side (arrow f direction) of the motor main body 10. A threaded hole 13c and a threaded hole 13d having a threaded groove corresponding to the threaded groove of the screw 70 are formed on the left side (arrow c direction) and the right side (arrow d direction) of the lead-out portion 12. In addition, in the motor 1, a rectangular or substantially rectangular lead-out portion 22 for leading out a lead wire 21 is provided on the upper side (arrow a direction) and at the edge of the rear side (arrow f direction) of the encoder 20. The lead wires 11 and 21 are formed of inexpensive lead wires such as a heat-resistant vinyl single-strand wire.

[0040] The lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20 are bundled and covered by a cylindrical body, that is, a heat shrink tube 4. The lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20 covered by the heat shrink tube 4 are led out from the grommet 30 as lead wires 3 ( Figure 1 A front fixing member 5e and a rear fixing member 5f are provided on the front side (arrow e direction) and the rear side (arrow f direction) of the heat shrink tube 4 for clamping and fixing the lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20 which are bundled and twisted. Figure 7 ).

[0041] In the motor 1, the grommet 30 blocks both the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20. In other words, the grommet 30 integrally covers and seals the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20. The grommet 30 is formed of an elastic body such as silicone rubber. The grommet 30 includes: a lead wire holding grommet 40 having a through hole 42 and a cutout portion 44, wherein the through hole 42 is used to hold both the lead wire 11 of the motor body 10 and the lead wire 21 of the encoder 20 and lead them to the outside, and the cutout portion 44 is a separation portion that opens the through hole 42; and a fixing grommet 50 having a groove portion (left groove portion 51c, right groove portion 51d) that fits with the lead wire holding grommet 40 to fix the lead wire holding grommet 40 between the fixing grommet 50 and the motor body 10.

[0042] Figure 4 (a) is a perspective view schematically showing the structure of the lead wire retaining grommet 40 of the motor 1 according to the embodiment of the present invention, Figure 4(b) is a front view schematically showing the structure of the lead wire holding grommet 40. In the grommet 30, the lead wire holding grommet 40 has a plate-like portion 41 in a square plate shape or a substantially square plate shape, and a through hole 42 penetrating the plate-like portion 41 in the axis X1 direction (arrow ef direction) is formed on the upper side (arrow a direction) of the center of the lead wire holding grommet 40. The diameter of the through hole 42 is slightly smaller than the diameter of the lead wire 3. In addition, the through hole 42 can be located at any position of the lead wire holding grommet 40, for example, it can also be located on the lower side of the center of the lead wire holding grommet 40.

[0043] Furthermore, the lead wire holding grommet 40 has a left flange portion 43c that protrudes toward the left side (in the direction of arrow c) from the left side (in the direction of arrow c) of the plate-like portion 41, and a right flange portion 43d that protrudes toward the right side (in the direction of arrow d) from the right side (in the direction of arrow d) of the plate-like portion 41. The left flange portion 43c and the right flange portion 43d have the same or substantially the same shape.

[0044] The rear side (arrow f direction) surfaces of the left flange portion 43c and the right flange portion 43d are flush with the rear side (arrow f direction) surface 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 or substantially the same as the height of the plate-like portion 41 in the height direction (arrow ab direction).

[0045] The lead retaining grommet 40 has a cutout portion 44 extending from the side of the lead retaining grommet 40 to the through hole 42. In the lead retaining grommet 40, the cutout portion 44 is at the center or approximately the center in the height direction (arrow ab direction) of the through hole 42, and extends from the side of the right side (arrow d direction) of the right flange portion 43d to the inner circumferential surface of the right side (arrow d direction) of the through hole 42 in parallel or approximately parallel to the width direction (arrow cd direction) with a specified width. In addition, the cutout portion 44 can be located at any position of the open through hole 42, and can be located on the upper side or lower side of the center of the through hole 42. In addition, the extension direction of the cutout portion 44 is not limited to the direction along the width. As described below, the cutout portion 44 only needs to be in a shape that is in close contact with the motor 1.

[0046] Figure 5 (a) is a perspective view schematically showing the structure of the fixing grommet 50 of the motor 1 according to the embodiment of the present invention. Figure 5 (b) is a front view schematically showing the structure of the fixing grommet 50, Figure 5(c) is a bottom view schematically showing the structure of the fixing grommet 50. The fixing grommet 50 has a housing portion (housing recess 52) for housing the lead wire 11 of the motor main body 10. The fixing grommet 50 has a plate-like portion 53 and side walls (left side wall 54c, right side wall 54d, front side wall 54e, rear side wall 54f) erected from the plate-like portion 53 of the fixing grommet 50, and the lead wire holding grommet 40 is fitted into the groove portion (left side groove portion 51c, right side groove portion 51d) so as to become a part of the side wall (front side wall 54e).

[0047] Specifically, a receiving recess 52 is formed in the fixing grommet 50. The recess 52 is formed in a rectangular parallelepiped shape or a substantially rectangular parallelepiped shape with a predetermined depth so as to be able to receive the lead wires 3 (the lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20). The width of the receiving recess 52 in the width direction (the direction of the arrow cd) is greater than the width of the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20 in the width direction (the direction of the arrow cd), and the receiving recess 52 covers the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20.

[0048] The fixing grommet 50 has a plate-like portion 53 in a square plate shape or a substantially square plate shape, and a left side wall 54c extending in parallel or substantially parallel to the height direction (arrow ab direction) from a surface on the lower side (arrow b direction) of the plate-like portion 53 toward the lower side (arrow b direction) at an edge portion on the left side (arrow c direction) of the plate-like portion 53. The fixing grommet 50 also has a right side wall 54d extending in parallel or substantially parallel to the height direction (arrow ab direction) from a surface on the lower side (arrow b direction) of the plate-like portion 53 toward the lower side (arrow b direction) at an edge portion on the right side (arrow d direction) of the plate-like portion 53.

[0049] The left side wall 54c and the right side wall 54d have through holes 55c and 55d respectively at the center or substantially the center in the axis X1 direction (arrow ef direction) penetrating from the upper side (arrow a direction) of the left side wall 54c and the right side wall 54d toward the lower side (arrow b direction). The through holes 55c and 55d are respectively formed at positions corresponding to the threaded slots 13c and 13d of the motor body 10, and are used to insert the screws 70.

[0050] Furthermore, the fixing grommet 50 has a front side wall 54e extending parallel or substantially parallel to the height direction (arrow ab direction) from the surface on the lower side (arrow b direction) of the plate-like portion 53 toward the lower side (arrow b direction) at the edge portion on the front side (arrow e direction) of the plate-like portion 53. The front side wall 54e has an opening 56 having a square or substantially square shape in a front view, and the opening 56 extends from the surface on the lower side (arrow b direction) of the front side wall 54e toward the surface on the upper side (arrow a direction) at the center or substantially the center in the width direction (arrow cd direction).

[0051] The height of the opening 56 in the height direction (arrow ab direction) and the width in the width direction (arrow cd direction) are smaller than the height of the plate-like portion 41 of the lead wire holding grommet 40 in the height direction (arrow ab direction) and the width in the width direction (arrow cd direction). Therefore, as described below, when the lead wire holding grommet 40 is mounted to the fixing grommet 50 and the grommet 30 is mounted to the motor body 10, the plate-like portion 41 is compressed in the height direction and the width direction. The opening 56 has a left groove portion 51c and a right groove portion 51d at the center or substantially the center in the axis X1 direction (arrow ef direction), and the groove portions are respectively recessed to the left side (arrow c direction) and the right side (arrow d direction). The left groove portion 51c and the right groove portion 51d extend parallel to or substantially parallel to the axis X1 direction (arrow ef direction) for a predetermined length.

[0052] 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 smaller than the width of the left flange portion 43c in the width direction (arrow cd direction) and the length in the axis X1 direction (arrow ef direction), and the left flange portion 43c is fitted into the left 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 smaller than the width of the right flange portion 43d in the width direction (arrow cd direction) and the length in the axis X1 direction (arrow ef direction), and the right flange portion 43d is fitted into the right groove portion 51d.

[0053] In addition, the fixing ring 50 has a rear side wall 54f at the edge portion of the rear side (arrow f direction) of the plate-like portion 53, and the rear side wall 54f extends from the surface of the lower side (arrow b direction) of the plate-like portion 53 toward the lower side (arrow b direction) in parallel or substantially parallel to the height direction (arrow ab direction).

[0054] Figure 6 (a) is a perspective view schematically showing the structure of the cover 60 of the motor 1 according to the embodiment of the present invention. Figure 6(b) is a front view schematically showing the structure of the cover 60. The cover 60 fixes the lead wire holding grommet 40 and the fixing grommet 50 on the upper side (arrow a direction) of the motor main body 10. The cover 60 has a plate-like portion 61 and legs (left leg 63c, right leg 63d) erected from the plate-like portion 61 of the cover 60, and the height H1 of the side wall (left side wall 54c, right side wall 54d) of the fixing grommet 50 is greater than the height H2 of the legs (left side leg 63c, right side leg 63d) of the cover 60.

[0055] In the cover 60, the plate-like portion 61 is formed in a square plate shape or a substantially square plate shape. The plate-like portion 61 has a through hole 62c and a through hole 62d penetrating from the upper side (arrow a direction) toward the lower side (arrow b direction) at the edge portion of the center or substantially the center in the axis X1 direction (arrow ef direction) and the right side (arrow d direction). The through hole 62c and the through hole 62d are formed at positions corresponding to the threaded slot hole 13c and the threaded slot hole 13d of the motor body 10, respectively, and are used to insert the screw 70.

[0056] The length of the plate-like portion 61 in the axis X1 direction (arrow ef direction) is the same or substantially the same as the width of the plate-like portion 53 in the axis X1 direction (arrow ef direction). The width of the plate-like portion 61 in the width direction (arrow cd direction) is slightly greater than the width of the plate-like portion 53 in the width direction (arrow cd direction).

[0057] Furthermore, the cover 60 has a left leg portion 63c at the edge portion on the left side (arrow c direction) of the plate-like portion 61, and the left leg portion 63c extends from the surface on the lower side (arrow b direction) of the plate-like portion 61 toward the lower side (arrow b direction) in parallel or substantially parallel to the height direction (arrow ab direction). Furthermore, the cover 60 has a right leg portion 63d at the edge portion on the right side (arrow d direction) of the plate-like portion 53, and the right leg portion 63d extends from the surface on the lower side (arrow b direction) of the plate-like portion 61 toward the lower side (arrow b direction) in parallel or substantially parallel to the height direction (arrow ab direction).

[0058] The shape of the right leg 63d is the same or substantially the same as that of the left leg 63c. The length of the left leg 63c and the right leg 63d in the axis X1 direction (arrow ef direction) is the same or substantially the same as the length of the plate-like portion 61 in the axis X1 direction (arrow ef direction).

[0059] The heights of the left leg portion 63c and the right leg portion 63d in the height direction (arrow ab direction) are respectively lower than the heights of the left side wall 54c and the right side wall 54d in the height direction (arrow ab direction) of the fixing grommet 50. The lengths of the left leg portion 63c and the right side wall 63d in the axis X1 direction (arrow ef direction) are the same or substantially the same as the lengths of the left side wall 54c and the right side wall 54d in the axis X1 direction (arrow ef direction).

[0060] The left leg 63c is in close contact with the left side surface (arrow c direction) of the left side wall 54c, and the right leg 63d is in close contact with the right side surface (arrow d direction) of the right side wall 54d. The height H2 of the left leg 63c and the right leg 63d in the height direction (arrow ab direction) is lower than the height H1 of the left side wall 54c and the right side wall 54d of the fixing grommet 50 in the height direction (arrow ab direction).

[0061] Next, a method for assembling the motor 1 having the above-described structure will be described. Figure 7 and Figure 8 It is a figure for demonstrating the assembly method of the lead wire 3 of the motor 1 which concerns on embodiment of this invention. Fig. 9 1 is a diagram for explaining a method of attaching the lead wire retaining grommet 40 of the motor 1 to the lead wire 3. Fig.10 The diagram is for explaining a method of attaching the fixing grommet 50 and the cover 60 of the motor 1 to the motor body 10 .

[0062] First, if Figure 7 As shown in the figure, the lead wire 11 led out from the lead-out portion 12 of the motor body 10 and the lead wire 21 led out from the lead-out portion 22 of the encoder 20 are bundled together and clamped and fixed by the rear side fixing member 5f near the front side (arrow e direction) of the lead-out portion 12. Then, the bundled lead wires 11 and 21 are twisted at a predetermined length on the front side (arrow e direction) of the rear side fixing member 5f, and the front end of the twist is clamped and fixed by the front side fixing member 5e.

[0063] If the leads 11 and 21 are fixed by the front fixing member 5e and the rear fixing member 5f, then Figure 8 As shown in FIG. 1 , a sheet-like heat shrink tube 4 is wound around the outer periphery of the twisted lead wires 11 and 21 between the front fixture 5e and the rear fixture 5f and temporarily fixed with an adhesive tape. Then, the wound heat shrink tube 4 is shrunk by hot air or the like and the adhesive tape is removed. Thus, the twisted lead wires 11 and 21 (lead wires 3) between the front fixture 5e and the rear fixture 5f are covered with the heat shrink tube 4. Alternatively, the lead wires 3 may be covered with a cylindrical body other than the heat shrink tube 4.

[0064] If the leads 11, 21 (lead 3) are covered by the heat shrink tube 4, then Fig. 9As shown, the leads 11, 21 (leads 3) covered by the heat shrink tube 4 between the front fixture 5e and the rear fixture 5f are mounted to the lead holding grommet 40 through the cutout portion 44 of the lead holding grommet 40. Since the diameter of the through hole 42 of the lead holding grommet 40 is slightly smaller than the diameter of the lead 3 and the leads 11, 21 (leads 3) are covered by the heat shrink tube 4, the through hole 42 of the lead holding grommet 40 and the leads 11, 21 (leads 3) are in close contact.

[0065] Afterwards, if Fig.10 As shown, the left flange portion 43c of the lead wire holding grommet 40 is fitted into the left groove portion 51c of the fixing grommet 50, and the right flange portion 43d of the lead wire holding grommet 40 is fitted into the right groove portion 51d of the fixing grommet 50. Thus, the lead wire holding grommet 40 is attached so as to become a part of the front side wall 54e of the fixing grommet 50. As described above, since the outer shape of the plate-like portion 41 of the lead wire holding grommet 40 is larger than the outer shape of the opening portion 56 of the fixing grommet 50, the plate-like portion 41 of the lead wire holding grommet 40 and the opening portion 56 of the fixing grommet 50 are in close contact.

[0066] Then, the fixing grommet 50 and the cover 60 are mounted to the motor body 10 by mounting the cover 60 on the fixing grommet 50 and tightening it with the screw 70. Before the cover 60 is mounted on the fixing grommet 50 and tightened with the screw 70, the height H1 of the left side wall 54c and the right side wall 54d of the fixing grommet 50 is greater than the height H2 of the left side leg 63c and the right side leg 63d of the cover 60.

[0067] Next, the fixing grommet 50 and the cover 60 are tightened by the screw 70 until the left leg 63c and the right leg 63d of the cover 60 contact the motor body 10, so that the fixing grommet 50 can be crushed and installed to the motor body 10, and the fixing grommet 50 and the motor body 10 are firmly and closely contacted. In addition, the cutout 44 of the lead wire holding grommet 40 is crushed to make the cutouts 44 of the lead wire holding grommet 40 firmly and closely contacted. After the cover 60 is mounted on the fixing grommet 50 and tightened by the screw 70, the height H1 of the left side wall 54c and the right side wall 54d of the fixing grommet 50 is compressed and becomes substantially the same as the height H2 of the left side leg 63c and the right side leg 63d of the cover 60. That is, in the fixed state where the fixing ring 50 is fixed to the motor body 10 and in the non-fixed state where the fixing ring 50 is not fixed to the motor body 10, the height of the left side wall 54c and the right side wall 54d of the fixing ring 50 is different from the height H2 of the left side leg 63c and the right side leg 63d of the cover 60.

[0068] Thus, in the motor 1 according to the embodiment of the present invention, the grommet 30 includes: a lead wire holding grommet 40 having a through hole 42 for holding the lead wire 11 of the motor body 10 and guiding it to the outside and a cutout portion 44 for opening the through hole 42; and a fixing grommet 50 having grooves (left groove 51c and right groove 51d) for fitting with the lead wire holding grommet 40 and fixing the lead wire holding grommet 40 between the fixing grommet 50 and the motor body 10. Therefore, the cutout portion 44 of the lead wire holding grommet 40 is crushed to make the cutout portions 44 of the lead wire holding grommet 40 firmly and closely contact each other. Furthermore, since there is no need to use a PVC shielded wire, the lead wire 11 of the motor body 10 can be sealed with a simple structure in which the lead wire 11 passes through the lead wire holding grommet 40 and the fixing grommet 50, so it is small and inexpensive, and the workability during assembly can be improved.

[0069] Specifically, in the motor 1, since the lead wires 11 of the motor body and the lead wires 21 of the encoder 20 are not led out separately but are led out from a single location, that is, the through hole 42 of the lead wire holding grommet 40, the size of the motor 1 can be reduced, the number of parts can be reduced, and the assembly workability of the motor 1 can be improved. In addition, in the motor 1, since the inexpensive and soft vinyl heat-resistant single-strand electric wire or the like is used instead of the expensive and hard PVC shielded wire, the cost of the motor 1 can be reduced and the assembly workability of the motor 1 can be improved.

[0070] Furthermore, in the motor 1, the fixing grommet 50 has a receiving recess 52 for receiving the lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20, and the receiving recess 52 integrally covers the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20. Furthermore, the lead wire holding grommet 40 is fitted into the left groove portion 51c and the right groove portion 51d of the fixing grommet 50 so as to become a part of the front side wall 54e of the fixing grommet 50. Therefore, since the lead-out portion 12 of the motor body 10 and the lead-out portion 22 of the encoder 20 can be sealed by the simple structure of the lead wire holding grommet 40 and the fixing grommet 50, it is small and inexpensive, and the workability during assembly can be improved.

[0071] In the motor 1, the lead wires 11 of the motor body 10 and the lead wires 21 of the encoder 20 are bundled and twisted, and covered with the heat shrink tube 4. Therefore, the through hole 42 of the lead wire holding grommet 40 and the lead wires 11, 21 (lead wire 3) can be in close contact.

[0072] The above describes the embodiments of the present invention, but the present invention is not limited to the above embodiments, but includes all forms contained in the concept of the present invention and the claims. In addition, each component can be appropriately selected and combined to achieve at least part of the above-mentioned topics and effects. For example, the shape, material, configuration, size, etc. of each component in the above embodiments can be appropriately changed according to the specific use form of the present invention.

[0073] For example, in the motor 1, the embodiment of the present invention is described by taking the case where the lead wire holding grommet 40 and the fixing grommet 50 are provided separately as an example, but the present invention is not limited to this, and the lead wire holding grommet 40 and the fixing grommet 50 may also be integrated. In this case, for example, the cutout portion 44 of the lead wire holding grommet 40 may extend in parallel or substantially parallel to the height direction (arrow ab direction) with a predetermined width from the surface of the lower side (arrow b direction side) of the portion corresponding to the plate-shaped portion 41 of the lead wire holding grommet 40 at the center or substantially center of the through hole 42 in the width direction (arrow cd direction) toward the inner peripheral surface of the lower side (arrow b direction side) of the through hole 42. The extending direction of the cutout portion 44 is not limited to this, and the cutout portion 44 only needs to extend between the through hole 42 and the lower side surface (arrow b direction side) of the grommet 30. In this case, the cutout portion 44 contacts the outer surface of the motor body 10. In addition, the cutout portion 44 is not limited to the case where it contacts the outer surface of the motor body portion 10 , and may extend from the outer surface of the grommet 30 that does not contact the motor body portion 10 toward the through hole 42 .

[0074] The cutout portion 44 is not limited by the processing method, and can be provided by any method, for example, by various methods such as cutout processing and mold integral molding.

[0075] In addition, in the motor 1, the embodiment of the present invention is described by taking the case where the fixing 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. For example, the fixing grommet 50 may also be formed in various shapes such as a cylindrical shape or a prism shape. In addition, in the motor 1, the embodiment of the present invention is described by taking the case where the detection device has a position detector 20 as an encoder installed on the rear side (arrow f direction) of the motor body 10 as an example, but the present invention is not limited to this. For example, it may be a detection device or electronic device having a braking mechanism, a locking mechanism, etc. In addition, it may have two or more detection devices, and all the lead-out parts are integrally covered and sealed by the grommet.

[0076] Description of Reference Numerals

[0077] 1 motor; 2 motor output shaft; 3 lead wire; 4 heat shrink tube; 5 fixing member; 10 motor body; 11 lead wire; 12 lead-out portion; 13c, 13d threaded slot; 20 encoder; 21 lead wire; 22 lead-out portion; 30 grommet; 40 lead wire retaining grommet; 41 plate-like portion; 42 through hole; 43c left flange portion; 43d right flange portion; 44 cutout portion; 50 fixing grommet; 51c left groove portion; 51d right groove portion; 52 accommodating recess; 53 plate-like portion; 54c left side wall; 54d right side wall; 54e front side wall; 54f rear side wall; 55c, 55d through holes; 56 opening portion; 60 cover; 61 plate-like portion; 62c, 62d through holes; 63c left leg portion; 63d right leg portion; 70 screw; X1 axis direction.

Claims

1. A motor, comprising: A motor main body having a lead-out portion for leading out the lead wire; and a grommet that blocks the lead-out portion of the motor main body portion, The grommet has a through hole for holding the lead wire of the motor body and a separation portion for opening the through hole. The separated portions of the grommets compressed in a direction from the grommets toward the motor main body portion are in close contact with each other.

2. The motor according to claim 1, wherein: The grommet includes: a lead wire holding grommet having the through hole and the separation portion; and a fixing grommet engaged with the lead wire holding grommet and fixed between the fixing grommet and the motor main body. The separated parts are in close contact with each other by the fixing grommet fixed to the motor main body.

3. The motor according to claim 2, wherein: The fixing grommet has a receiving portion for receiving the lead wire of the motor main body.

4. The motor according to claim 2 or 3, wherein: The fixing grommet has a plate-shaped portion and a side wall erected from the plate-shaped portion of the fixing grommet, and the lead wire holding grommet is fitted to the fixing grommet so as to form a part of the side wall.

5. The motor according to claim 2 or 3, wherein: It also includes at least one detection device, which is installed on the motor body and has a lead-out portion for leading out the lead wire. The grommet blocks both the lead-out portion of the motor body and the lead-out portion of the detection device. The lead wire holding grommet holds both the lead wires of the motor main body and the lead wires of the detection device.

6. The motor according to claim 5, wherein: The lead wires of the motor main body and the lead wires of the detection device are bundled and covered by a cylindrical body.

7. The motor according to claim 1 or 2, wherein: The separation portion is a cutout portion extending from the outer surface of the grommet to the through hole.

8. The motor according to claim 1, wherein: The lead wire is led out along the axial direction of the motor.

9. The motor according to claim 7, wherein: The separation portion contacts an outer surface of the motor body portion.

10. The motor according to claim 2, wherein: The separation portion is a cutout portion extending from a side surface of the lead wire holding grommet to the through hole.

11. The electric machine according to claim 4, wherein: Also included is a cover for fixing the grommet to the motor body, 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 fixing grommet and the height of the leg of the cover are different in a fixed state where the fixing grommet is fixed to the motor body and in a non-fixed state where the fixing grommet is not fixed to the motor body.

12. The electric machine according to claim 11, wherein: When the fixing grommet is in a fixed state where the fixing grommet is fixed to the motor main body, the height of the side wall of the fixing grommet is substantially equal to the height of the leg of the cover, and when the fixing grommet is in a non-fixed state where the fixing grommet is not fixed to the motor main body, the height of the side wall of the fixing grommet is greater than the height of the leg of the cover.

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