Motor

Abstract

The invention provides a motor which is small in size, low in cost and capable of improving workability during assembly. The motor comprises a motor main body part which is provided with a lead-out part for leading out a lead wire; a grommet that blocks the lead-out portion of the motor main body portion; the detection device is provided with a lead-out part for leading out a lead, the detection device is installed on the motor main body part, the grommet blocks the lead-out part of the motor main body part and the lead-out part of the detection device, and the grommet holds the lead of the motor main body part and the lead of the detection device. The grommet has a through-hole for holding a lead wire of the motor main body and a separation portion for opening the through-hole, and the separation portions of the grommet compressed in a direction from the grommet toward the motor main body are in close contact with each other.

Description

This application is a divisional application of the patent application with the application number 201980065401.6, the application date of October 11, 2019, and the invention title of "Motor". Technical Field

[0001] The present invention relates to a motor. Background Art

[0002] Heretofore, motors such as hybrid stepping motors have been used for various purposes. In such a motor, in the case of being used for applications exposed to impurities such as dust and liquid, in order to prevent malfunction due to external impurities, for example, a lead-out portion serving as a lead wire outlet is protected by a grommet or the like. In such a motor, for example, a lead wire lead-out portion on a motor housing is sealed by a three-body structure of a grommet, a tube, and a cover (for example, refer to Patent Document 1). (Prior Art Documents) (Patent Documents)

[0003] Patent Document 1: JP-A-2010-17034. Summary of the Invention (Problems to be Solved by the Invention)

[0004] In such a conventional motor, in the case where a detection device such as an encoder (position detector) is installed, it is necessary to seal the lead-out portions of both the motor and the detection device. Therefore, the structure for sealing the lead-out portion may become complicated, and the workability during assembly may be reduced. In addition, when the lead wires of the motor and the encoder are separately sealed, the motor becomes large-sized.

[0005] In order to seal the lead-out portion, when the lead wire is formed as a PVC shielded wire and a grommet and a cover are installed on the PVC shielded wire, since the PVC shielded wire is expensive, the price of the motor becomes high, and since the PVC shielded wire is hard, the workability during assembly may be reduced. Thus, for a conventional motor, a structure that is small-sized and inexpensive and can improve the workability during assembly is required.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a motor that is small-sized and inexpensive and can improve the workability during assembly. (Means for Solving the Problems)

[0007] In order to achieve the above object, a motor device according to the present invention is characterized in that it includes: a motor main body portion having a lead-out portion for leading out a lead wire; and a grommet that blocks the lead-out portion of the motor main body portion, the grommet having a through hole for holding the lead wire of the motor main body portion and a separation portion for opening the through hole.

[0008] In addition, in the motor according to the present invention, the grommet has: a lead holding grommet having the through hole and the separating portion; and a fixing grommet that is fitted to the lead holding grommet and fixes the lead holding grommet between the fixing grommet and the motor main body portion.

[0009] In addition, in the motor according to the present invention, the fixing grommet has a receiving portion for receiving the leads of the motor main body portion.

[0010] In addition, in the motor according to the present invention, the fixing grommet has a plate-like portion and side walls erected from the plate-like portion of the fixing grommet, and the lead holding grommet is fitted to the fixing grommet so as to be a part of the side walls.

[0011] In addition, in the motor according to the present invention, it further includes at least one detection device that is mounted on the motor main body portion and has a lead-out portion for leading out leads. The grommet plugs both the lead-out portion of the motor main body portion and the lead-out portion of the detection device, and the lead holding grommet holds both the leads of the motor main body portion and the leads of the detection device.

[0012] In addition, in the motor according to the present invention, the leads of the motor main body portion and the leads of the detection device are bundled and covered with a cylindrical body.

[0013] In addition, in the motor according to the present invention, the separating portion is a cutout portion that extends from the outer surface of the grommet to the through hole.

[0014] In addition, in the motor according to the present invention, the separating portion contacts the outer surface of the motor main body portion.

[0015] In addition, in the motor according to the present invention, the separating portion is a cutout portion that extends from the side surface of the lead holding grommet to the through hole.

[0016] In addition, in the motor according to the present invention, it further includes a cover for fixing the grommet to the motor main body portion. The cover has a plate-like portion and legs erected from the plate-like portion of the cover. The height of the side walls of the fixing grommet is different from the height of the legs of the cover in the fixed state where the fixing grommet is fixed to the motor main body portion and in the non-fixed state where the fixing grommet is not fixed to the motor main body portion.

[0017] In addition, in the motor according to the present invention, in the fixed state where the fixing grommet is fixed to the motor main body portion, the height of the side walls of the fixing grommet is substantially equal to the height of the legs of the cover, and in the non-fixed state where the fixing grommet is not fixed to the motor main body portion, the height of the side walls of the fixing grommet is greater than the height of the legs of the cover. (Advantages of the Invention)

[0018] The motor according to the present invention is small and inexpensive, and can improve workability during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a perspective view schematically showing the configuration of a motor according to an embodiment of the present invention. Figure 2 FIG. is an exploded perspective view schematically showing the configuration of a motor according to an embodiment of the present invention. Figure 3 FIG. is an exploded perspective view schematically showing the configuration of a motor according to an embodiment of the present invention. Figure 4 (a) FIG. is a perspective view schematically showing the configuration of a lead holding grommet of a motor according to an embodiment of the present invention, Figure 4 (b) FIG. is a front view schematically showing the configuration of the lead holding grommet. Figure 5 (a) FIG. is a perspective view schematically showing the configuration of a fixing grommet of a motor according to an embodiment of the present invention, Figure 5 (b) FIG. is a front view schematically showing the configuration of the fixing grommet, Figure 5 (c) FIG. is a bottom view schematically showing the configuration of the fixing grommet 50. Figure 6 (a) FIG. is a perspective view schematically showing the configuration of a cover of a motor according to an embodiment of the present invention, Figure 6 (b) FIG. is a front view schematically showing the configuration of the cover. Figure 7 FIG. is a diagram for explaining a method of assembling leads of a motor according to an embodiment of the present invention. Figure 8 FIG. is a diagram for explaining a method of assembling leads of a motor according to an embodiment of the present invention. Figure 9 FIG. is a diagram for explaining a method of installing a lead holding grommet of a motor according to an embodiment of the present invention onto a lead. Figure 10 FIG. is a diagram for explaining a method of installing a fixing grommet and a cover of a motor according to an embodiment of the present invention onto a motor main body portion. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0021] Figure 1 FIG. is a perspective view schematically showing the configuration of a motor 1 according to an embodiment of the present invention, Figure 2 and Figure 3is an exploded perspective view schematically showing the configuration of the electric motor 1. Hereinafter, for ease of explanation, the height direction of the electric motor 1 in Figure 1 is set as the direction of arrow ab, the direction of arrow a is set as the upper side, and the direction of arrow b is set as the lower side. In addition, the Figure 1 width direction of the electric motor 1 in Figure 1 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. In addition, the

[0022] axis direction X1 of the motor output shaft 2 of the electric motor 1 in

[0023] is set as the direction of arrow ef, the direction of arrow e is set as the front side, and the direction of arrow f is set as the rear side. In the following description, when using up, down, left, right, front, and rear to describe the positional relationship and direction of each component, it only represents the positional relationship and direction in the drawing, and does not represent the positional relationship and direction when actually assembled into the device.

[0022] The electric motor 1 according to an embodiment of the present invention includes: a motor main body portion 10 having a lead-out portion 12 for leading out a lead wire 11; and a grommet 30 that closes the lead-out portion 12 of the motor main body portion 10, and the grommet 30 has a through hole 42 for holding the lead wire 11 of the motor main body portion 10 and a cutout portion 44 that is a separation portion for opening the through hole 42. Hereinafter, the configuration of the electric motor 1 will be specifically described.

[0023] As Figure 1 shown, the electric motor 1 is formed, for example, in a rectangular parallelepiped shape or substantially in a rectangular parallelepiped shape, and the motor output shaft 2 extends forward (in the direction of arrow e) from the center or substantially the center of the electric motor 1. The electric motor 1 includes: a motor main body portion 10 having a motor output shaft 2; and a position detector 20 as an encoder, which is a detection device mounted on the rear side (in the direction of arrow f) of the motor main body portion 10. In addition, the electric motor 1 is configured such that the grommet 30 and the cover 60 are mounted on the upper side (in the direction of arrow a) by screws 70.

[0024] A drive signal or electric power is supplied to the electric motor 1 via the lead wire 3 led out from the grommet 30, and the motor output shaft 2 of the electric motor 1 is rotated by this drive signal or electric power. As the electric motor 1, for example, a stepping motor, a DC motor, a DC brushless motor, etc. can be used. The electric motor 1 can also be an AC motor.

[0025] In the electric motor 1, as Figure 2 and Figure 3As shown, at the upper side (in the direction of arrow a) of the motor main body portion 10 and at the edge portion at the rear side (in the direction of arrow f), there is a rectangular or substantially rectangular lead-out portion 12 for leading out the lead wire 11. On the left side (in the direction of arrow c) and the right side (in the direction of arrow d) of the lead-out portion 12, there are formed threaded hole 13c and threaded hole 13d having threaded grooves corresponding to the threaded grooves of the screw 70. Further, in the motor 1, at the upper side (in the direction of arrow a) of the encoder 20 and at the edge portion at the rear side (in the direction of arrow f), there is a rectangular or substantially rectangular lead-out portion 22 for leading out the lead wire 21. The lead wires 11 and 21 are formed of inexpensive lead wires such as ethylene heat-resistant single-strand wires, for example.

[0026] The lead wire 11 of the motor main body portion 10 and the lead wire 21 of the encoder 20 are bundled and covered by a cylindrical body, i.e., a heat-shrinkable tube 4. The lead wire 11 of the motor main body portion 10 and the lead wire 21 of the encoder 20 covered by the heat-shrinkable tube 4 are led out as a lead wire 3 from the grommet 30 ( Figure 1 ). At the front side (in the direction of arrow e) and the rear side (in the direction of arrow f) of the heat-shrinkable tube 4, there are provided a front fixing member 5e and a rear fixing member 5f for clamping and fixing the bundled and twisted lead wire 11 of the motor main body portion 10 and the lead wire 21 of the encoder 20 ( Figure 7 ).

[0027] In the motor 1, the grommet 30 closes both the lead-out portion 12 of the motor main body portion 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 main body portion 10 and the lead-out portion 22 of the encoder 20. The grommet 30 is formed of an elastic body such as silicone rubber, for example. The grommet 30 includes: a lead wire holding grommet 40 having a through hole 42 and a cutout portion 44, the through hole 42 being for holding both the lead wire 11 of the motor main body portion 10 and the lead wire 21 of the encoder 20 and leading them to the outside, the cutout portion 44 serving as a separating portion for opening the through hole 42; and a fixing grommet 50 having groove portions (left groove portion 51c, right groove portion 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 main body portion 10.

[0028] Figure 4 (a) 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. Figure 4(b) is a front view schematically showing the configuration of the lead holding grommet 40. In the grommet 30, the lead holding grommet 40 has a plate-like portion 41 in a square plate shape or a substantially square plate shape. A through hole 42 penetrating the plate-like portion 41 in the direction of axis X1 (arrow ef direction) is formed on the upper side (arrow a direction) of the center of the lead holding grommet 40. The diameter of the through hole 42 is slightly smaller than the diameter of the lead 3. Additionally, the through hole 42 can be located at any position of the lead holding grommet 40. For example, it can also be located on the lower side of the center of the lead holding grommet 40.

[0029] In addition, the lead holding grommet 40 has a left flange portion 43c that protrudes toward the left (arrow c direction) from the left side (arrow c direction) surface of the plate-like portion 41, and a right flange portion 43d that protrudes toward the right (arrow d direction) from the right side (arrow d direction) surface 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.

[0030] 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 heights of the left flange portion 43c and the right flange portion 43d in the height direction (arrow ab direction) are the same as or substantially the same as the height of the plate-like portion 41 in the height direction (arrow ab direction).

[0031] The lead holding grommet 40 has a cutout portion 44 extending from the side surface of the lead holding grommet 40 to the through hole 42. In the lead holding grommet 40, the cutout portion 44 extends from the right side (arrow d direction) surface of the right flange portion 43d to the inner peripheral surface on the right side (arrow d direction) of the through hole 42 at or substantially at the center in the height direction (arrow ab direction) of the through hole 42 with a specified width parallel or substantially parallel to the width direction (arrow cd direction). Additionally, the cutout portion 44 can be located at any position opening the through hole 42, and can be located on the upper side or the lower side of the center of the through hole 42. Furthermore, the extending 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 closely contacts the motor 1.

[0032] Figure 5 (a) is a perspective view schematically showing the configuration of the fixing grommet 50 of the motor 1 according to an embodiment of the present invention. Figure 5 (b) is a front view schematically showing the configuration of the fixing grommet 50. Figure 5(c) is a bottom view schematically showing the configuration of the fixing grommet 50. The fixing grommet 50 has a receiving portion (receiving recess 52) for receiving the lead wire 11 of the motor main body portion 10. Further, 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 groove portions (left groove portion 51c, right groove portion 51d) so as to be a part of the side wall (front side wall 54e).

[0033] Specifically, a receiving recess 52 is formed in the fixing grommet 50. The receiving 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 wire 11 of the motor main body portion 10 and the lead wire 21 of the encoder 20). The width of the receiving recess 52 in the width direction (arrow cd direction) is larger than the widths of the lead-out portions 12 of the motor main body portion 10 and the lead-out portion 22 of the encoder 20 in the width direction (arrow cd direction), and the receiving recess 52 covers the lead-out portion 12 of the motor main body portion 10 and the lead-out portion 22 of the encoder 20.

[0034] Further, 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. The left side wall 54c extends from the lower side (arrow b direction) surface of the plate-like portion 53 in parallel or substantially parallel to the height direction (arrow ab direction) downward (arrow b direction) at the edge portion on the left side (arrow c direction) of the plate-like portion 53. Further, the fixing grommet 50 also has a right side wall 54d. The right side wall 54d extends from the lower side (arrow b direction) surface of the plate-like portion 53 in parallel or substantially parallel to the height direction (arrow ab direction) downward (arrow b direction) at the edge portion on the right side (arrow d direction) of the plate-like portion 53.

[0035] The left side wall 54c and the right side wall 54d respectively have through holes 55c and 55d penetrating from the upper side (arrow a direction) surface to the lower side (arrow b direction) surface at the center or substantially center in the axis X1 direction (arrow ef direction). The through holes 55c and 55d are respectively formed at positions corresponding to the threaded groove holes 13c and 13d of the motor main body portion 10 and are used for inserting the screws 70.

[0036] In addition, the fixing grommet 50 has a front side wall 54e which extends parallel or substantially parallel to the height direction (arrow ab direction) from 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 which is square or substantially square in a front view, and the opening 56 extends from the lower side (arrow b direction) of the front side wall 54e toward the upper side (arrow a direction) at or substantially at the center in the width direction (arrow cd direction).

[0037] 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 holding grommet 40 in the height direction (arrow ab direction) and the width in the width direction (arrow cd direction). Thus, as described below, when the lead holding grommet 40 is mounted on the fixing grommet 50 and the grommet 30 is mounted on the motor main body portion 10, the plate-like portion 41 is compressed in the height direction and the width direction. The opening 56 has a left side groove portion 51c and a right side groove portion 51d at or substantially at the center in the axis X1 direction (arrow ef direction), and the groove portions are recessed from the left side (arrow c direction) and the right side (arrow d direction) toward the left side (arrow c direction) and the right side (arrow d direction), respectively. The left side groove portion 51c and the right side groove portion 51d extend a predetermined length parallel or substantially parallel to the axis X1 direction (arrow ef direction).

[0038] The width of the left side 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 side groove portion 51c. The width of the right side 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 side groove portion 51d.

[0039] In addition, the fixing grommet 50 has a rear side wall 54f at the edge portion on the rear side (arrow f direction) of the plate-like portion 53, and the rear side wall 54f extends parallel or substantially parallel to the height direction (arrow ab direction) from the lower side (arrow b direction) of the plate-like portion 53 toward the lower side (arrow b direction).

[0040] Figure 6 (a) is a perspective view schematically showing the configuration 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 holding grommet 40 and the fixing grommet 50 on the upper side (in the direction of arrow a) of the motor main body portion 10. The cover 60 has a plate-like portion 61 and legs (left leg 63c and right leg 63d) erected from the plate-like portion 61 of the cover 60. The height H1 of the side walls (left side wall 54c and right side wall 54d) of the fixing grommet 50 is greater than the height H2 of the legs (left leg 63c and right leg 63d) of the cover 60.

[0041] 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 through holes 62c and 62d penetrating from the upper side (in the direction of arrow a) surface to the lower side (in the direction of arrow b) surface at the edge portions on the left side (in the direction of arrow c) and the right side (in the direction of arrow d) of the center or substantially the center in the axis X1 direction (in the direction of arrow ef). The through holes 62c and 62d are respectively formed at positions corresponding to the threaded groove holes 13c and 13d of the motor main body portion 10 and are used for inserting the screws 70.

[0042] The length of the plate-like portion 61 in the axis X1 direction (in the direction of arrow ef) is the same as or substantially the same as the width of the plate-like portion 53 in the axis X1 direction (in the direction of arrow ef). The width of the plate-like portion 61 in the width direction (in the direction of arrow cd) is slightly greater than the width of the plate-like portion 53 in the width direction (in the direction of arrow cd).

[0043] In addition, the cover 60 has a left leg 63c at the edge portion on the left side (in the direction of arrow c) of the plate-like portion 61, and the left leg 63c extends from the lower side (in the direction of arrow b) surface of the plate-like portion 61 parallel or substantially parallel to the height direction (in the direction of arrow ab) towards the lower side (in the direction of arrow b). In addition, the cover 60 has a right leg 63d at the edge portion on the right side (in the direction of arrow d) of the plate-like portion 53, and the right leg 63d extends from the lower side (in the direction of arrow b) surface of the plate-like portion 61 parallel or substantially parallel to the height direction (in the direction of arrow ab) towards the lower side (in the direction of arrow b).

[0044] The shape of the right leg 63d is the same as or substantially the same as the shape of the left leg 63c. The length of the left leg 63c and the right leg 63d in the axis X1 direction (in the direction of arrow ef) is the same as or substantially the same as the length of the plate-like portion 61 in the axis X1 direction (in the direction of arrow ef).

[0045] The heights of the left leg 63c and the right leg 63d in the height direction (the direction of arrow ab) are respectively lower than the heights of the left wall 54c and the right wall 54d of the fixing grommet 50 in the height direction (the direction of arrow ab). The lengths of the left leg 63c and the right leg 63d in the direction of axis X1 (the direction of arrow ef) are the same as or substantially the same as the lengths of the left wall 54c and the right wall 54d in the direction of axis X1 (the direction of arrow ef).

[0046] The left leg 63c is in close contact with the left (the direction of arrow c) surface of the left wall 54c, and the right leg 63d is in close contact with the right (the direction of arrow d) surface of the right wall 54d. The heights H2 of the left leg 63c and the right leg 63d in the height direction (the direction of arrow ab) are respectively lower than the heights H1 of the left wall 54c and the right wall 54d of the fixing grommet 50 in the height direction (the direction of arrow ab).

[0047] Next, an assembling method of the motor 1 having the above configuration will be described. Figure 7 and Figure 8 is a diagram for explaining an assembling method of the lead wire 3 of the motor 1 according to an embodiment of the present invention. Figure 9 is a diagram for explaining an installation method of attaching the lead wire holding grommet 40 of the motor 1 to the lead wire 3, Figure 10 is a diagram for explaining an installation method of attaching the fixing grommet 50 and the cover 60 of the motor 1 to the motor main body portion 10.

[0048] First, as Figure 7 shown, the lead wire 11 led out from the lead-out portion 12 of the motor main body portion 10 and the lead wire 21 led out from the lead-out portion 22 of the encoder 20 are bundled together, and are clamped and fixed by the rear fixing member 5f near the front side (the direction of arrow e) of the lead-out portion 12. Then, the bundled lead wires 11, 21 are twisted by a predetermined length on the front side (the direction of arrow e) of the rear fixing member 5f, and the front end portion of the twisted part is clamped and fixed by the front fixing member 5e.

[0049] If the lead wires 11, 21 are fixed by the front fixing member 5e and the rear fixing member 5f, then as Figure 8 shown, a sheet-like heat shrinkable tube 4 is wound around the outer periphery of the twisted lead wires 11, 21 between the front fixing member 5e and the rear fixing member 5f and temporarily fixed with tape. Then, the wound heat shrinkable tube 4 is shrunk by hot air or the like and the tape is removed. Thus, the twisted lead wires 11, 21 (lead wire 3) between the front fixing member 5e and the rear fixing member 5f are covered with the heat shrinkable tube 4. In addition, the lead wire 3 may also be covered with a cylindrical body other than the heat shrinkable tube 4.

[0050] If the lead wires 11, 21 (lead wire 3) are covered with the heat shrinkable tube 4, then as Figure 9As shown, the lead wires 11, 21 (lead wire 3) covered by the heat shrink tube 4 between the front fixing member 5e and the rear fixing member 5f are mounted to the lead wire holding grommet 40 through the cutout portion 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, 21 (lead wire 3) are covered by the heat shrink tube 4, there is a tight contact between the through hole 42 of the lead wire holding grommet 40 and the lead wires 11, 21 (lead wire 3).

[0051] After that, as Figure 10 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 mounted in such a manner as to be 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, there is a tight contact between the plate-like portion 41 of the lead wire holding grommet 40 and the opening portion 56 of the fixing grommet 50.

[0052] Then, by mounting the cover 60 on the fixing grommet 50 and tightening with the screw 70, the fixing grommet 50 and the cover 60 are mounted to the motor main body portion 10. Before mounting the cover 60 on the fixing grommet 50 and tightening 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 leg portion 63c and the right leg portion 63d of the cover 60.

[0053] Next, by tightening the fixing grommet 50 and the cover 60 with the screw 70 until the left leg portion 63c and the right leg portion 63d of the cover 60 contact the motor main body portion 10, the fixing grommet 50 can be crushed and mounted to the motor main body portion 10, and a firm and tight contact can be made between the fixing grommet 50 and the motor main body portion 10. In addition, the cutout portion 44 of the lead wire holding grommet 40 is crushed so that there is a firm and tight contact between the cutout portions 44 of the lead wire holding grommet 40. After mounting the cover 60 on the fixing grommet 50 and tightening 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 compressed and becomes substantially the same as the height H2 of the left leg portion 63c and the right leg portion 63d of the cover 60. That is, in the fixed state where the fixing grommet 50 is fixed to the motor main body portion 10 and the non-fixed state where the fixing grommet 50 is not fixed to the motor main body portion 10, the height of the left side wall 54c and the right side wall 54d of the fixing grommet 50 is different from the height H2 of the left leg portion 63c and the right leg portion 63d of the cover 60.

[0054] Thus, in the motor 1 according to the embodiment of the present invention, the grommet 30 includes: a lead holding grommet 40 having a through hole 42 for holding the lead 11 of the motor main 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) that engage with the lead holding grommet 40 and fix the lead holding grommet 40 between the fixing grommet 50 and the motor main body 10. Therefore, the cutout portion 44 of the lead holding grommet 40 is crushed so that the cutout portions 44 of the lead holding grommet 40 are firmly in close contact with each other. And since there is no need to use a PVC shielded wire, the lead 11 of the motor main body 10 can be sealed at the lead-out portion 12 of the motor main body 10 with a simple structure passing through the lead holding grommet 40 and the fixing grommet 50, so it is small and inexpensive, and the workability during assembly can be improved.

[0055] Specifically, in the motor 1, since the lead 11 of the motor main body and the lead 21 of the encoder 20 are not led out separately but from a single portion of the through hole 42 of the lead holding grommet 40, the size of the motor 1 can be reduced and the number of parts can be decreased, and the assembly workability of the motor 1 can be improved. In addition, in the motor 1, since an inexpensive and soft ethylene heat-resistant single-strand wire or the like is used instead of an 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.

[0056] In addition, in the motor 1, the fixing grommet 50 has a receiving recess 52 for receiving the lead 11 of the motor main body 10 and the lead 21 of the encoder 20, and the receiving recess 52 integrally covers the lead-out portion 12 of the motor main body 10 and the lead-out portion 22 of the encoder 20. In addition, the lead holding grommet 40 is fitted into the left groove 51c and the right groove 51d of the fixing grommet 50 so as to be a part of the front side wall 54e of the fixing grommet 50. Therefore, since the lead-out portion 12 of the motor main body 10 and the lead-out portion 22 of the encoder 20 can be sealed with a simple structure of the lead holding grommet 40 and the fixing grommet 50, it is small and inexpensive, and the workability during assembly can be improved.

[0057] In addition, in the motor 1, the leads 11 of the motor main body 10 and the leads 21 of the encoder 20 are bundled and twisted, and covered with a heat-shrinkable tube 4. Therefore, the through hole 42 of the lead holding grommet 40 can be in close contact with the leads 11 and 21 (lead 3).

[0058] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited to the above embodiments, but includes all forms included in the concept and claims of the present invention. In addition, each component can be appropriately selected and combined to achieve at least a part of the above problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiments can be appropriately changed according to the specific usage form of the present invention.

[0059] For example, in the electric motor 1, the embodiments of the present invention have been explained by taking the case where the lead holding grommet 40 and the fixing grommet 50 are provided separately. However, the present invention is not limited to this, and the lead holding grommet 40 and the fixing grommet 50 may also be integrated. In this case, for example, the cut portion 44 of the lead holding grommet 40 may extend in a direction parallel or substantially parallel to the height direction (arrow ab direction) with a predetermined width from the lower side (arrow b direction side) surface of the portion corresponding to the plate-like portion 41 of the lead holding grommet 40 to the inner peripheral surface of the lower side (arrow b direction side) of the through hole 42 at the center or substantially the center in the width direction (arrow cd direction). The extending direction of the cut portion 44 is not limited to this, and the cut 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 cut portion 44 contacts the outer surface of the motor main body portion 10. In addition, the cut portion 44 is not limited to the case of contacting the outer surface of the motor main body portion 10, and may also extend from the outer surface of the grommet 30 that does not contact the motor main body portion 10 toward the through hole 42.

[0060] In addition, the cut portion 44 is not limited by the processing method. The cut portion 44 can be provided by any method, for example, formed by various methods such as cutting and integral molding with a mold.

[0061] Furthermore, in the electric motor 1, the embodiments of the present invention have been explained by taking the case where the fixing grommet 50 is formed in a square shape or substantially square shape. However, 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 prismatic shape. In addition, in the electric motor 1, the embodiments of the present invention have been explained by taking the case where the detection device has a position detector 20 as an encoder mounted on the rear side (arrow f direction) of the motor main body portion 10. However, the present invention is not limited to this. For example, it may also be a detection device or an electronic device having a braking mechanism, a locking mechanism, etc. In addition, there may also be two or more detection devices, and all lead-out portions are integrally covered and sealed by the grommet. Explanation of Reference Numerals

[0062] 1 Motor; 2 Motor output shaft; 3 Lead wire; 4 Heat shrinkable tube; 5 Fixing member; 10 Motor main body part; 11 Lead wire; 12 Lead-out part; 13c, 13d Threaded slot holes; 20 Encoder; 21 Lead wire; 22 Lead-out part; 30 Cable tie; 40 Lead wire holding cable tie; 41 Plate-like part; 42 Through hole; 43c Left flange part; 43d Right flange part; 44 Cutout part; 50 Fixing cable tie; 51c Left groove part; 51d Right groove part; 52 Receiving recess; 53 Plate-like part; 54c Left side wall; 54d Right side wall; 54e Front side wall; 54f Rear side wall; 55c, 55d Through holes; 56 Opening; 60 Cover; 61 Plate-like part; 62c, 62d Through holes; 63c Left leg; 63d Right leg; 70 Screw; X1 Axis direction.

Claims

1. A motor, comprising: A motor main body having a lead-out portion for leading out leads; A grommet for blocking the lead-out portion of the motor main body; And A detection device having a lead-out portion for leading out leads, The detection device is mounted on the motor main body, The grommet blocks the lead-out portion of the motor main body and the lead-out portion of the detection device, The grommet holds the leads of the motor main body and the leads of the detection device, The grommet has a through-hole for holding the leads of the motor main body and a separating portion for opening the through-hole, The separating portions of the grommet compressed in the direction from the grommet toward the motor main body are in close contact with each other.

2. The motor according to claim 1, wherein, The grommet has: A lead-holding grommet having the separating portion; and A fixing grommet that fits with the lead-holding grommet and fixes the lead-holding grommet between the fixing grommet and the motor main body, Through the fixing grommet fixed to the motor main body, the separating portions are in close contact with each other.

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

4. The motor according to claim 2, wherein, The fixing grommet has a plate-like portion and side walls erected from the plate-like portion of the fixing grommet, The lead-holding grommet fits with the fixing grommet so as to be a part of the side wall.

5. The motor according to any one of claims 1 to 4, wherein, The leads of the motor main body and the leads of the detection device are bundled and covered with a cylindrical body.

6. A motor, comprising: A motor main body having a lead-out portion for leading out leads; A grommet for blocking the lead-out portion of the motor main body; And A detection device having a lead-out portion for leading out leads, The detection device is mounted on the motor main body, The grommet blocks the lead-out portion of the motor main body and the lead-out portion of the detection device, The grommet holds the leads of the motor main body and the leads of the detection device, The grommet includes: A lead-holding grommet having a plate-like portion and a plurality of flange portions protruding from the plate-like portion; And A fixing grommet that fits with the lead-holding grommet, The lead-holding grommet is clamped between the fixing grommet fixed to the motor main body and the motor main body, The plurality of flange portions protrude in opposite directions in the circumferential direction from the plate-like portion, The fixing grommet includes a plate-like portion, a side wall having a plurality of groove portions, and a receiving portion for receiving the leads of the motor main body, The plurality of flange portions of the lead-holding grommet are fitted into the plurality of groove portions of the fixing grommet.

7. The motor according to claim 6, wherein, The leads of the motor main body and the leads of the detection device are bundled and covered with a cylindrical body.

8. The motor according to claim 6, wherein, The fixing grommet includes a left side wall, a right side wall, a front side wall, and a rear side wall, The lead-holding grommet forms a part of the front side wall of the fixing grommet.

9. The motor according to claim 8, wherein, The front side wall includes an opening portion.

10. The motor according to claim 9, wherein, The opening portion includes the plurality of groove portions.

11. The motor according to claim 10, wherein, The plurality of flange portions are a left flange portion and a right flange portion, The plurality of groove portions are a left groove portion and a right groove portion.

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