CN216390662U

CN216390662U - Motor

Info

Publication number: CN216390662U
Application number: CN202122369040.1U
Authority: CN
Inventors: 樱田国士; 森下裕司
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-09-30
Filing date: 2021-09-28
Publication date: 2022-04-26
Anticipated expiration: 2031-09-28
Also published as: JP2022057505A

Abstract

The utility model provides a motor. The motor has: a shaft disposed along a central axis extending vertically; a stator mounted on the shaft; and a lead wire electrically connected to the stator, the shaft having: a hole portion extending from one side to the other side; a sealing member disposed in at least a part of the hole; and a cover member, the hole portion having: a 1 st hole opened at one side of the shaft; and a 2 nd hole which is opened on the other side of the shaft and connected to the 1 st hole, the lead is disposed inside the 1 st hole and inside the 2 nd hole, the cover member is disposed in the 1 st hole opening and covers the outer surface of the lead, and the sealing member is disposed on the other side of the position where the cover member is disposed.

Description

Motor

Technical Field

The present invention relates to a motor.

Background

Conventionally, a motor having a fixed shaft is known. Conventionally, a stator is fixed to a fixed shaft. The stator is connected with a lead wire (see, for example, japanese unexamined patent publication No. h 6-311702).

Conventionally, a fixed shaft having a through hole is used. A lead is inserted into the through hole. Here, in the structure using the fixed shaft having the through hole, there is a possibility that foreign matter enters the inside from the outside of the motor through the through hole.

SUMMERY OF THE UTILITY MODEL

The utility model aims to prevent foreign matters from entering the motor from the outside.

An exemplary motor of the present invention has: a shaft disposed along a central axis extending vertically; a stator mounted on the shaft; and a lead wire electrically connected with the stator. The shaft has: a hole portion extending from one side to the other side; a sealing member disposed in at least a part of the hole; and a cover member. The hole portion has: a 1 st hole opened at one side of the shaft; and a 2 nd hole which is opened at the other side of the shaft and connected to the 1 st hole. The lead wires are disposed inside the 1 st hole and inside the 2 nd hole. The cover member is disposed in the opening of the 1 st hole and covers the outer surface of the lead. The sealing member is disposed on the other side of the disposition position of the cover member.

In the above embodiment, the sealing member is in contact with the other end of the cover member.

In the above embodiment, the cover member has a tubular shape having a through hole extending from the one side to the other side, the cover member has a gap portion which is continuous with the through hole from an outer peripheral surface of the cover member and extends from an end portion of the one side to an end portion of the other side of the cover member, and the lead is disposed inside the through hole.

In the above embodiment, the inner peripheral surface of the cover member has a protruding portion protruding in a direction perpendicular to the cylinder axis direction, and the protruding portion contacts the outer surface of the lead.

In the above embodiment, the sealing member is disposed inside the 2 nd hole.

In the above embodiment, the hole portion has the 3 rd hole, and the 3 rd hole is continuous with the 1 st hole and opens on the outer peripheral surface of the shaft.

In the above embodiment, the sealing member is disposed inside the 3 rd hole.

In the above embodiment, the shaft has a closing member disposed at the opening of the 3 rd hole and covering the 3 rd hole.

In the above embodiment, the shaft has a covering member that is in contact with an outer peripheral surface of the shaft and covers the opening of the 1 st hole and the opening of the 3 rd hole.

In the above embodiment, the constituent material of the sealing member includes a resin, and the constituent material of the covering member includes a resin different from the constituent material of the sealing member.

In the above embodiment, the shaft has a flange portion, the opening of the 1 st hole is located in the flange portion, and the opening of the 3 rd hole is located in the flange portion.

In the above embodiment, the opening of the 3 rd hole is located within a range from the position of the opening of the 1 st hole to a position deviated by an angle of less than 90 ° in the circumferential direction centered on the central axis.

According to the exemplary motor of the present invention, it is possible to suppress intrusion of foreign matter from the outside of the motor into the inside.

The above and other features, elements, steps, features and advantages of the present invention will be more clearly understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view showing the inside of a motor of an embodiment.

Fig. 2 is a perspective view of the shaft of the embodiment as viewed from one side.

Fig. 3 is a perspective view of the shaft of the embodiment viewed from the other side.

Fig. 4 is a partial cross-sectional view of a shaft of an embodiment.

Fig. 5 is a partial sectional view showing the 1 st hole and the 2 nd hole of the embodiment.

Fig. 6 is an enlarged view showing a flange portion of the shaft of the embodiment.

Fig. 7 is a perspective view of the cover member of the embodiment.

Fig. 8 is a sectional view of the cover member of the embodiment.

Fig. 9 is a plan view of a modified cover member as viewed from the cylinder axis direction.

Fig. 10 is an enlarged view showing a sheathing member of the embodiment.

Fig. 11 is a sectional view showing a closed structure of the 3 rd hole of the embodiment.

Fig. 12 is a sectional view showing a closed structure of the 3 rd hole of the modification.

Detailed Description

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

In the present specification, a direction parallel to the central axis CA of the motor 100 is referred to as an "axial direction", and a direction perpendicular to the central axis CA is referred to as a "radial direction". The shape and positional relationship of each part will be described with the axial direction as the vertical direction. However, the definition of the vertical direction does not limit the orientation and positional relationship of the motor 100 when used.

In the present specification, the shape and positional relationship of each part will be described with the left-right direction in fig. 4 as the left-right direction of the motor 100. However, the definition of the left-right direction does not limit the orientation and positional relationship of the motor 100 when used. In the following description, the right side in the radial direction with respect to the center axis CA in fig. 4 is referred to as "one side", and the left side in the radial direction with respect to the center axis CA in fig. 4 is referred to as "the other side".

Fig. 1 is a perspective view showing the inside of a motor 100 of the present embodiment.

The motor 100 of the present embodiment is integrated with the rear wheel of the electric motorcycle. That is, the motor 100 is an in-wheel motor. The motor 100 has a rim 101. A tire is mounted on the rim 101.

The rim 101 has a cylindrical shape extending in the axial direction. The rim 101 has openings in the axial upper and lower directions. The axially upper opening and the axially lower opening of the rim 101 are covered with covers, not shown, respectively. Further, a plurality of magnets, not shown, are disposed on the inner circumferential surface of the rim 101. The plurality of magnets are arranged in a circumferential direction around the center axis CA. The rim 101 rotates about the center axis CA.

In the following description, the region on the radially inner side of the rim 101 is defined as the inside of the motor 100. In addition, an area outside the radially inner side of the rim 101 is defined as the outside of the motor 100.

The motor 100 includes a shaft 1, a stator 2, and a lead wire 3. The shaft 1 is disposed along a central axis CA extending vertically. I.e. the rim 101 rotates around the axis 1. The shaft 1 will be described in detail later.

The stator 2 is mounted on the shaft 1. The stator 2 is disposed radially inward of the rim 101. That is, the stator 2 is disposed inside the motor 100. The outer peripheral surface of the stator 2 is radially opposed to a plurality of magnets arranged on the inner peripheral surface of the rim 101. The stator 2 rotates the rim 101.

The stator 2 includes an insulator 201, a coil portion 202, and a stator core not shown. The stator core is an annular magnetic body centered on the center axis CA, and is a laminated body in which a plurality of electromagnetic steel plates are laminated in the axial direction. The insulating material 201 is an insulating member using resin or the like. The insulator 201 covers at least a portion of the stator core. The coil portion 202 is a copper wire, and is wound around the stator core via an insulator 201.

The stator 2 also has a circuit board 203. The circuit board 203 is mounted to the insulator 201. The circuit board 203 is connected to the coil portion 202.

The lead wires 3 are electrically connected to the stator 2. Specifically, the stator 2 is connected to a plurality of lead wires 3. The plurality of lead wires 3 are bundled on 1 wire. A part of the leads 3 is connected to the circuit board 203, and the other leads 3 are connected to the coil portion 202. That is, the lead wire 3 has a portion arranged inside the motor 100.

The lead wire 3 is drawn out from the inside to the outside of the motor 100. That is, the lead wire 3 has a portion disposed outside the motor 100. The lead 3 is connected to a Power Drive Unit (PDU) (not shown) outside the motor 100. The PDU controls driving of the motor 100. In addition, the PDU controls power supply to the motor 100.

Fig. 2 is a perspective view of the shaft 1 of the present embodiment as viewed from one side. Fig. 3 is a perspective view of the shaft 1 of the present embodiment as viewed from the other side. Fig. 4 is a partial sectional view of the shaft 1 of the present embodiment. Fig. 5 is a partial sectional view showing the 1 st hole 11 and the 2 nd hole 12 of the present embodiment. Fig. 4 and 5 show a cross-sectional structure of the shaft 1 in a case where the shaft 1 is cut by a plane including the central axis CA. Fig. 6 is an enlarged view showing flange portion 110 of shaft 1 according to the present embodiment.

The shaft 1 includes a hole 10, a seal member 20, and a cover member 30.

The hole portion 10 extends from one side to the other side. Here, the hole portion 10 has a 1 st hole 11 and a 2 nd hole 12. The hole 10 has a 3 rd hole 13.

The 1 st hole 11 is open at one side of the shaft 1. The opening of the 1 st hole 11 is located at the flange portion 110. That is, the shaft 1 has a flange portion 110, and the opening of the 1 st hole 11 is located in the flange portion 110. Further, flange portion 110 is located inside motor 100. Therefore, the opening of the 1 st hole 11 is located inside the motor 100.

The 2 nd hole 12 opens on the other side of the shaft 1. The 2 nd hole 12 is connected to the 1 st hole 11. That is, the hole 10 penetrates from one side to the other side. The lead 3 is disposed inside the 1 st hole 11 and inside the 2 nd hole 12.

The 2 nd hole 12 has an opening at a position axially above the opening position of the 1 st hole 11 in the shaft 1. Specifically, the opening of the 2 nd hole 12 is located at a portion of the shaft 1 protruding to the outside of the motor 100. That is, the opening of the 1 st hole 11 is located inside the motor 100, whereas the opening of the 2 nd hole 12 is located outside the motor 100. This allows the lead wire 3 to be drawn out from the inside of the motor 100 to the outside through the hole 10.

The 3 rd hole 13 opens on the outer peripheral surface of the shaft 1. The 3 rd hole 13 is connected to the 1 st hole 11. The inner diameter of the 3 rd hole 13 is smaller than the inner diameters of the 1 st hole 11 and the 2 nd hole 12.

For example, the 3 rd hole 13 is an injection hole of resin in the step of injecting resin as a constituent material of the sealing member 20 into the 1 st hole 11. For example, in the injection step of injecting the resin into the 1 st hole 11, the injection nozzle is inserted into the 3 rd hole 13. Then, the resin is ejected from the injection nozzle.

In addition, for example, the 3 rd hole 13 is used to confirm the filling state of the resin in the 1 st hole 11. For example, when the 3 rd hole 13 is located axially above the 1 st hole 11, if the 1 st hole 11 is sufficiently filled with the resin, the resin gradually rises to reach the 3 rd hole 13. Thus, the resin rising to the 3 rd hole 13 is visually confirmed, and the filling state of the resin in the 1 st hole 11 can be confirmed.

The constituent material of the sealing member 20 includes resin. The sealing member 20 uses silicone resin. In addition, the use of resin as a constituent material of the sealing member 20 is exemplified. As a constituent material of the sealing member 20, an adhesive or the like can be widely used. The sealing member 20 is disposed in at least a part of the hole 10. Specifically, at least a part of the seal member 20 is disposed inside the 1 st hole 11.

The sealing member 20 closes a gap between the inner peripheral surface of the 1 st hole 11 and the outer surface of the lead 3 at least inside the 1 st hole 11. That is, the sealing member 20 covers the outer surface of the lead 3. Thus, even if foreign matter enters hole 10 from the opening of hole 2 12 outside motor 100, the foreign matter entering hole 10 can be prevented from reaching the inside of motor 100. In addition, the foreign matter includes liquid such as water. In addition, the foreign matter includes dust such as dust.

In the following description, a direction parallel to the cylinder axis 30C of the cover member 30 is referred to as a "cylinder axis direction".

The cover member 30 is called a grommet, for example. The cover member 30 is a member elastically deformable compared to the shaft 1. For example, the cover member 30 is made of rubber. The cover member 30 is disposed at the opening of the 1 st hole 11. In other words, the cover member 30 is disposed on the opening side of the 1 st hole 11 in the interior of the 1 st hole 11. In other words, the end 30a of the cover member 30 on the one side and the end 30b of the cover member 30 on the other side are disposed inside the 1 st hole 11. The one end 30a of the cover member 30 may be disposed inside the 1 st hole 11, or may protrude from the outer peripheral surface of the shaft 1. By using an elastically deformable member such as rubber as the cover member 30, the work of inserting the cover member 30 into the 1 st hole 11 is facilitated when the cover member 30 is disposed in the opening of the 1 st hole 11.

The lead 3 is disposed inside the cover member 30. That is, the cover member 30 covers the outer surface of the lead 3.

Here, the sealing member 20 and the cover member 30 are disposed inside the 1 st hole 11. Specifically, the seal member 20 is disposed on the other side of the disposition position of the cover member 30.

In the configuration in which the sealing member 20 is disposed on the other side of the position where the cover member 30 is disposed, when resin, which is a constituent material of the sealing member 20, is injected into the 1 st hole 11, the cover member 30 is first disposed at the opening of the 1 st hole 11. Then, resin is injected from the 3 rd hole 13 to the 1 st hole 11. At this time, the flow of the resin injected into the 1 st hole 11 is blocked by the cover member 30.

That is, by disposing the cover member 30 at the opening of the 1 st hole 11, when the resin which is the constituent material of the sealing member 20 is injected into the 1 st hole 11, the leakage of the resin from the 1 st hole 11 can be suppressed. This enables the inside of the 1 st hole 11 to be reliably closed by the sealing member 20. As a result, the intrusion of foreign matter from the outside of the motor 100 into the inside can be reliably suppressed.

The cover member 30 has a tubular shape having a through hole 31 extending from one side to the other side. The lead 3 is disposed inside the through hole 31. Thus, even if the cover member 30 is disposed at the opening of the 1 st hole 11, the lead 3 can be drawn out from the 1 st hole 11 through the through hole 31.

Fig. 7 is a perspective view of the cover member 30 of the present embodiment. Fig. 8 is a sectional view of the cover member 30 of the present embodiment. Fig. 8 shows a cross-sectional structure of the cover member 30 when the cover member 30 is cut by a plane including the cylinder axis 30C. Fig. 8 shows the lead 3 disposed inside the cover member 30.

The cover member 30 has a gap portion 32. The gap portion 32 is connected to the through hole 31 from the outer peripheral surface of the cover member 30, and extends from one end 30a of the cover member 30 to the other end 30 b. Specifically, the cover member 30 has a pair of

end surfaces

32a and 32b facing each other with a gap in the circumferential direction around the cylinder axis 30C. Further, a region between the pair of

end surfaces

32a and 32b becomes the gap portion 32. Thus, the lead 3 can be disposed inside the cover member 30 through the gap 32. As a result, workability in disposing the lead 3 inside the cover member 30 is improved.

The cover member 30 has projections and depressions on the inner peripheral surface. Specifically, the inner peripheral surface of the cover member 30 has a projection 33 projecting in a direction perpendicular to the cylinder axis direction. Further, 2 projections 33 are provided on the inner peripheral surface of the cover member 30. The 2 projections 33 each project annularly in a direction perpendicular to the cylinder axis direction. The number of the projections 33 is not particularly limited. The number of the protruding portions 33 may be 1, or the number of the protruding portions 33 may be 2 or more.

Also, the protruding portion 33 is in contact with the outer surface of the lead 3. Here, when the lead 3 is inserted into the cover member 30, the cover member 30 is elastically deformed outward in the radial direction perpendicular to the cylinder axis direction. Therefore, after the lead 3 is inserted into the cover member 30, the lead 3 is biased radially inward perpendicular to the axial direction of the cylinder by the projection 33. Therefore, the protruding portion 33 is in close contact with the outer surface of the lead 3. This can reliably seal the through hole 31 with the lead 3. As a result, when the resin, which is a constituent material of the sealing member 20, is injected into the 1 st hole 11, the resin can be prevented from leaking through the through-hole 31.

Fig. 9 is a plan view of the cover member 30 of a modification example as viewed from the cylinder axis direction.

In the modified example, the cover member 30 has a gap portion 32 which is continuous from the outer peripheral surface to the through hole 31 and extends from one end portion 30a to the other end portion 30 b. That is, the cover member 30 has a pair of

end surfaces

32a and 32 b. However, in the modification, the pair of end faces 32a and 32b contact each other.

In the modification, when the resin as the constituent material of the sealing member 20 is injected into the 1 st hole 11, the resin can be suppressed from leaking through the gap portion 32. Here, the cover member 30 is made of rubber. Therefore, when the lead 3 is disposed inside the cover member 30, the distance between the pair of

end surfaces

32a and 32b can be easily increased. Therefore, the workability in disposing the lead 3 inside the cover member 30 can be suppressed from being lowered.

As shown in fig. 5, the sealing member 20 is in contact with the cover member 30 inside the 1 st hole 11. The seal member 20 is located on the other side of the position where the cover member 30 is arranged. Therefore, the sealing member 20 contacts the other end 30b of the cover member 30.

Here, in the step of injecting the resin as a constituent material of the sealing member 20 into the 1 st hole 11, when the resin is sufficiently filled into the 1 st hole 11, the sealing member 20 comes into contact with the other end portion 30b of the cover member 30 after the resin is cured. That is, in the configuration in which the sealing member 20 is in contact with the other end portion 30b of the cover member 30, the 1 st hole 11 can be reliably closed by the sealing member 20.

Further, the seal member 20 extends from the 1 st hole 11 to the 2 nd hole 12. That is, the seal member 20 is disposed inside the 2 nd hole 12. Here, in the step of injecting the resin as a constituent material of the sealing member 20 into the 1 st hole 11, if the 1 st hole 11 is sufficiently filled with the resin, the resin overflows from the 1 st hole 11 and reaches the 2 nd hole 12. As a result, after the resin is cured, the sealing member 20 is disposed in the 2 nd hole 12 in addition to the 1 st hole 11. That is, in the configuration in which the sealing member 20 is disposed inside the 2 nd hole 12, the 1 st hole 11 can be more reliably closed by the sealing member 20.

Fig. 10 is an enlarged view showing the covering member 40 of the present embodiment.

The shaft 1 has a sheathing member 40. The covering member 40 is disposed on the flange 110. The covering member 40 is in contact with the outer peripheral surface of the shaft 1, and covers the opening of the 1 st hole 11 and the opening of the 3 rd hole 13. In other words, the cladding member 40 closes the 1 st hole 11 and the 3 rd hole 13 from the outside of the shaft 1. Thus, even if foreign matter enters hole 10 from the opening of hole 2 12 outside motor 100, the foreign matter entering hole 10 can be prevented from leaking out through hole 1 11. Further, it is possible to suppress the foreign matter entering hole 10 from leaking out through hole 3. Further, the lead 3 drawn out from the 1 st hole 11 penetrates the covering member 40.

In addition, the covering member 40 continuously extends from the opening position of the 1 st hole 11 to the opening position of the 3 rd hole 13. That is, the opening of the 1 st hole 11 and the opening of the 3 rd hole 13 are covered by a single covering member 40.

Here, the opening of the 3 rd hole 13 is located at the flange portion 110. That is, the opening of the 1 st hole 11 and the opening of the 3 rd hole 13 are located in the flange portion 110, respectively. For example, the axial position of the opening of the 3 rd hole 13 is substantially the same as the axial position of the opening of the 1 st hole 11. Also, the opening of the 3 rd hole 13 is located in a range from the position of the opening of the 1 st hole 11 to a position deviated by an angle smaller than 90 ° in the circumferential direction centering on the center axis CA. Thus, even if the covering member 40 is continuously extended from the opening position of the 1 st hole 11 to the opening position of the 3 rd hole 13, an increase in the amount of the constituent material of the covering member 40 can be suppressed.

Further, by continuously extending the covering member 40 from the opening position of the 1 st hole 11 to the opening position of the 3 rd hole 13, the contact area between the outer peripheral surface of the shaft 1 and the covering member 40 can be increased as compared with the case of covering the opening of the 1 st hole 11 and the opening of the 3 rd hole 13, respectively. This can prevent the covering member 40 from falling off from the outer peripheral surface of the shaft 1.

The constituent material of the covering member 40 includes resin. The sheathing member 40 uses silicone resin. However, the constituent material of the covering member 40 includes a resin different from the constituent material of the sealing member 20. For example, the material of the sealing member 20 is a low-viscosity resin. On the other hand, the constituent material of the covering member 40 is a high-viscosity resin having a higher viscosity than the constituent material of the sealing member 20. In the case where a low-viscosity resin is used as a constituent material of the sealing member 20, the resin can be reliably filled in the 1 st hole 11 in the injection step of injecting the resin into the 1 st hole 11. In the case of using a high-viscosity resin as the constituent material of the covering member 40, the resin can be suppressed from dripping when the constituent material of the covering member 40 is applied to the outer circumferential surface of the shaft 1.

Fig. 11 is a sectional view showing a closing structure of the 3 rd hole 13 of the present embodiment.

The sealing member 20 reaches from the 1 st hole 11 to the 3 rd hole 13. That is, the sealing member 20 is disposed inside the 3 rd hole 13. Here, in the step of injecting the resin as a constituent material of the sealing member 20 into the 1 st hole 11, if the 1 st hole 11 is sufficiently filled with the resin, the resin overflows from the 1 st hole 11 and reaches the 3 rd hole 13. As a result, after the resin is cured, the sealing member 20 is disposed in the 3 rd hole 13 in addition to the 1 st hole 11. That is, in the configuration in which the sealing member 20 is disposed inside the 3 rd hole 13, the 3 rd hole 13 can be reliably closed.

Further, the 3 rd hole 13 in which the sealing member 20 is disposed is further covered with the covering member 40. This enables the 3 rd hole 13 to be more reliably closed. However, the covering member 40 covering the 3 rd hole 13 may be omitted.

Fig. 12 is a sectional view showing a closed structure of the 3 rd hole 13 of the modification.

In the modification, the shaft 1 has a closing member 50. For example, the closing member 50 is made of rubber. The closing member 50 has a pin portion 51 and a flange portion 52.

The pin portion 51 has a cylindrical shape. In addition, the pin portion 51 has a projection 51 a. The projection 51a of the pin portion 51 projects radially outward of the pin portion 51. The pin portion 51 is inserted into the 3 rd hole 13 and disposed inside the 3 rd hole 13. The projection 51a of the pin portion 51 contacts the inner peripheral surface of the 3 rd hole 13. The flange portion 52 is disk-shaped and extends radially outward of the pin portion 51. The flange portion 52 is in contact with the outer peripheral surface of the shaft 1.

In this way, in the modification, the closing member 50 is disposed at the opening of the 3 rd hole 13 and covers the 3 rd hole 13. This enables the 3 rd hole 13 to be more reliably closed.

In addition, in the modification, the 3 rd hole 13 covered with the blocking member 50 is further covered with the covering member 40. In the structure of the modified example, the covering member 40 covering the 3 rd hole 13 may be omitted. In the structure of the modified example, the sealing member 20 may be disposed in at least a part of the inside of the 3 rd hole 13.

The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented with various modifications without departing from the spirit of the present invention. In addition, the above embodiments can be combined as appropriate.

For example, in the above-described embodiment, the present invention is applied to an in-wheel motor of an electric motorcycle, but the present invention can also be applied to various applications such as an electric power-assisted bicycle.

The present invention can be used as, for example, an in-wheel motor of an electric motorcycle.

Claims

1. A motor, comprising:

a shaft disposed along a central axis extending vertically;

a stator mounted on the shaft; and

a lead wire electrically connected with the stator,

the shaft has:

a hole portion extending from one side to the other side;

a sealing member disposed in at least a part of the hole; and

the cover part is provided with a cover plate,

the hole portion has:

a 1 st hole opened at the one side of the shaft; and

a 2 nd hole opened at the other side of the shaft and connected to the 1 st hole,

it is characterized in that the preparation method is characterized in that,

the lead wires are arranged inside the 1 st hole and inside the 2 nd hole,

the cover member is disposed in the opening of the 1 st hole and covers the outer surface of the lead,

the sealing member is disposed on the other side of the disposition position of the cover member.

2. The motor of claim 1,

the seal member is in contact with an end portion of the other side of the cover member.

3. The motor of claim 1,

the cover member has a tubular shape having a through hole extending from the one side to the other side,

the cover member has a gap portion which is formed,

the gap portion is continuous with the through hole from the outer peripheral surface of the cover member and extends from the one end portion to the other end portion of the cover member,

the lead is disposed inside the through hole.

4. The motor of claim 3,

the inner peripheral surface of the cover member has a projection projecting in a direction perpendicular to the cylinder axis direction,

the protrusion is in contact with an outer surface of the lead.

5. The motor of claim 4,

the sealing member is disposed inside the 2 nd hole.

6. The motor of claim 5,

the hole portion has a 3 rd hole,

the 3 rd hole is connected to the 1 st hole and opens at the outer circumferential surface of the shaft.

7. The motor of claim 6,

the sealing member is disposed inside the 3 rd hole.

8. The motor of claim 7,

the shaft is provided with a closing member which,

the closing member is disposed at an opening of the 3 rd hole and covers the 3 rd hole.

9. The motor of claim 6,

the shaft is provided with a cladding component,

the cover member is in contact with an outer peripheral surface of the shaft and covers an opening of the 1 st hole and an opening of the 3 rd hole.

10. The motor of claim 9,

the constituent material of the sealing member contains a resin,

the constituent material of the covering member includes a resin different from the constituent material of the sealing member.

11. The motor of claim 6,

the shaft has a flange portion at which the opening of the 1 st hole is located,

the opening of the 3 rd hole is located at the flange portion.

12. The motor of claim 6,

the opening of the 3 rd hole is located in a range from the position of the opening of the 1 st hole to a position deviated by an angle of less than 90 ° in a circumferential direction centered on the central axis.