CN216599211U - Motor - Google Patents

Abstract

The motor includes: a main shaft disposed along a vertically extending central axis; a stator mounted on the main shaft; and a lead wire electrically connected to the stator, the main shaft having a hole portion extending from one side to the other side in a radial direction and a seal member disposed in at least a part of the hole portion, the hole portion having a first hole opened in one side of the main shaft and a second hole opened in the other side of the main shaft and connected to the first hole, the seal member being disposed inside the first hole, the lead wire being disposed inside the first hole and inside the second hole, the main shaft having a cover member extending in a cylindrical shape along a central axis, an inner peripheral surface of the cover member covering the first hole. According to the motor of the present invention, the intrusion of foreign matter from the outside of the motor into the motor can be suppressed.

Description

Motor

Technical Field

The present invention relates to a motor.

Background

Conventionally, a motor including a fixed shaft is known. Conventionally, a stator is fixed to a fixed shaft. Lead wires are connected to the stator (see, for example, Japanese patent laid-open publication No. Hei 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 from the outside of the motor to the inside through the through-hole.

SUMMERY OF THE UTILITY MODEL

The purpose of the present invention is to suppress the intrusion of foreign matter from the outside of a motor into the inside.

An exemplary motor of the present invention includes: a main shaft disposed along a vertically extending central axis; a stator mounted on the main shaft; and a lead wire electrically connected to the stator. The main shaft has a hole portion extending from one side to the other side in the radial direction, and a seal member disposed in at least a part of the hole portion. The hole portion has a first hole opened at one side of the main shaft and a second hole opened at the other side of the main shaft and connected to the first hole. The sealing member is disposed inside the first hole. The leads are arranged in the first hole and the second hole. The spindle has a cover member extending in a cylindrical shape along a center axis. The inner peripheral surface of the cover member covers the first hole.

[ solution 2]

In the above embodiment, the seal member has a first seal portion disposed between an outer peripheral surface of the main shaft and an inner peripheral surface of the cover member, and the first seal portion covers an opening of the first hole.

[ solution 3]

In the above-described embodiment, the inner peripheral surface of the lid member has a first recess portion recessed radially outward, the first recess portion faces the opening of the first hole, and the first seal portion is disposed inside the first recess portion.

[ solution 4]

In the embodiment, the first recess has an opening at an upper end of the cover member, extending from the upper end to a lower end of the cover member.

[ solution 5]

In the above embodiment, a first upper end portion as an upper end portion of the first seal portion is located below an upper end of the lid member.

[ solution 6]

In the above embodiment, the hole portion has a third hole that is continuous with the first hole and opens to the outer peripheral surface of the spindle, and the seal member is disposed inside the third hole.

[ solution 7]

In the above embodiment, the opening of the third hole is located below the upper end of the cover member, and the inner peripheral surface of the cover member covers the third hole.

[ solution 8]

In the above embodiment, the spindle has a flange portion where the opening of the first hole is located, the flange portion protrudes radially outward from an outer peripheral surface of the spindle, and the opening of the third hole is located in the flange portion.

[ solution 9]

In the above embodiment, the seal member has a second seal portion disposed between an outer peripheral surface of the main shaft and an inner peripheral surface of the cover member, and the second seal portion covers the opening of the third hole.

[ solution 10]

In the above-described embodiment, the inner peripheral surface of the lid member has a second recess portion recessed radially outward, the second recess portion faces the opening of the third hole, and the second seal portion is disposed inside the second recess portion.

[ solution 11]

In the embodiment, the second recess has an opening at an upper end of the cover member, extending from the upper end to a lower end of the cover member.

[ solution 12]

In the above embodiment, a second upper end portion, which is an upper end portion of the second sealing portion, is located below an upper end of the lid member.

[ solution 13]

In the above-described embodiment, the outer peripheral surface of the cover member has a protruding portion protruding outward in the radial direction, and the inner peripheral surface of the cover member has the second recessed portion inward in the radial direction of the protruding portion.

[ solution 14]

In the above-described embodiment, the cover member has a wiring hole that penetrates from a radially inner side to a radially outer side of the cover member, an opening of the wiring hole overlaps with an opening of the first hole, and the lead is disposed radially inwardly of the cover member and radially outwardly of the cover member.

[ solution 15]

In the above embodiment, the cover member has a gap portion extending from an upper end of the cover member to a lower end of the cover member via the wiring hole and penetrating from a radially inner side to a radially outer side of the cover member.

[ solution 16]

In the above embodiment, the cover member has a gap portion extending from an upper end to a lower end of the cover member and penetrating from a radially inner side to a radially outer side of the cover member.

[ solution 17]

In the embodiment, the stator has a stator holder having a main shaft fixing portion extending in a cylindrical shape along the central axis, an inner circumferential surface of the main shaft fixing portion is fixed to an outer circumferential surface of the main shaft, and a lower end of the cover member is in contact with an upper end of the holder as an upper end of the main shaft fixing portion.

[ solution 18]

In the above embodiment, the outer peripheral surface of the spindle includes a region having a first surface roughness and a region having a second surface roughness larger than the first surface roughness, and the cover member is disposed in the region having the second surface roughness.

According to the exemplary motor of the present invention, intrusion of foreign matter from the outside to the inside of the motor can be suppressed.

These and other features, elements, steps, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment.

Fig. 2 is a perspective view showing the inside of the motor according to the embodiment.

Fig. 3 is a perspective view of the main shaft of the embodiment.

Fig. 4 is a perspective view of the embodiment with the principal axis viewed from one side thereof.

Fig. 5 is a perspective view of the embodiment viewed from the other side with respect to the main axis.

Fig. 6 is a partial sectional view of the main shaft of the embodiment.

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

Fig. 8 is an enlarged perspective view of the lid member and its periphery of the embodiment.

Fig. 9 is a perspective view of a cover member of a modification.

[ description of symbols ]

1: main shaft

2: stator

3: lead wire

10: hole part

11: first hole

12: second hole

13: third hole

20: sealing member

21: a first sealing part

21 a: a first upper end part

22: second sealing part

22 a: second upper end part

30: cover member

30a, 40 a: upper end of

30 b: lower end

31: first concave part

32: second concave part

32a, 32 b: end face

33: projection part

40: flange part

100: motor with a stator having a stator core

101: bearing assembly

101 a: inner ring

101 b: outer ring

110: wheel hub

111: first cover

112: second cover

200: stator holder

201: insulator

202: coil

203: circuit board

210: main shaft fixing part

210 a: upper end of holder

220: holder body portion

230: iron core holding part

310: wiring hole

320: gap part

321: first gap part

322: second gap portion

CA: center shaft

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 the shape and positional relationship of each portion will be described with the axial direction as a vertical direction. However, the definition of the up-down direction does not limit the direction and the positional relationship when the motor 100 is used.

In the present specification, a direction perpendicular to the central axis CA is referred to as a "radial direction", and a circumferential direction around the central axis CA is referred to as a "circumferential direction". In the radial direction, a direction approaching the central axis CA is referred to as "radially inward", and a direction away from the central axis CA is referred to as "radially outward".

In this specification, the shape and positional relationship of each part will be described with the left-right direction of fig. 6 being the left-right direction of the motor 100. However, the definition of the left-right direction does not limit the direction and positional relationship when the motor 100 is used. In the present specification, the right side in the radial direction with respect to the center axis CA of fig. 6 is referred to as "one side", and the left side in the radial direction with respect to the center axis CA of fig. 6 is referred to as "the other side".

Fig. 1 is a perspective view of a motor 100 according to the present embodiment. Fig. 2 is a perspective view showing the inside of the motor 100 of the present embodiment.

The motor 100 of the present embodiment is integrated with the rear wheel of the electric bicycle. That is, the motor 100 is an in wheel (in wheel) motor. The motor 100 includes a hub (rim) 110. A tire is mounted on the hub 110.

The hub 110 has a cylindrical shape extending in the axial direction. The hub 110 has openings at the upper and lower sides, respectively. The opening above the hub 110 is covered by a first cover 111. The opening below the hub 110 is covered by a second cover 112. The first cover 111 and the second cover 112 are fixed to the hub 110, respectively. A bearing 101 is fixed to a radial center portion of the first cover 111. A bearing, not shown, is fixed to a radial center portion of the second cover 112.

Further, a plurality of magnets, not shown, are arranged on the inner circumferential surface of the hub 110. The plurality of magnets are arranged in a circumferential direction.

In the following description, the radially inner region of hub 110 is defined as the inside of motor 100, and the radially outer region of hub 110 is defined as the outside of motor 100. That is, the area surrounded by the hub 110, the first cover 111, and the second cover 112 is defined as the inside of the motor 100, and the area surrounded by the hub 110, the first cover 111, and the second cover 112 is defined as the outside of the motor 100.

The motor 100 includes a main shaft 1, a stator 2, and a lead wire 3. The spindle 1 is disposed along a central axis CA extending vertically. For example, the main shaft 1 is inserted into the bearing 101 of the first cover 111 and a bearing (not shown) of the second cover 112. The first cover 111 and the second cover 112 rotate around the axis of the main shaft 1. The hub 110 rotates around the axis of the spindle 1 together with the first cover 111 and the second cover 112.

The stator 2 is mounted to the main shaft 1. The stator 2 is disposed radially inward of the hub 110. That is, the stator 2 is disposed inside the motor 100. The outer peripheral surface of the stator 2 faces the plurality of magnets arranged on the inner peripheral surface of the hub 110 in the radial direction. The stator 2 rotates the hub 110.

The stator 2 has a stator holder 200. The stator holder 200 has a spindle fixing part 210 extending in a cylindrical shape along the central axis CA. Also, the stator holder 200 has a holder body portion 220. Further, the stator holder 200 has a core holding part 230.

The holder body 220 has a disk shape centered on the central axis CA and extends in the radial direction. The holder body portion 220 has an opening at a radially central portion. The main shaft fixing part 210 extends upward from a radially inner edge of the holder body part 220. The inner peripheral surface of the spindle fixing portion 210 is fixed to the outer peripheral surface of the spindle 1. The core holding portion 230 is cylindrical and extends upward from the outer edge of the holder main body portion 220 in the radial direction.

The stator 2 includes a stator core (not shown), an insulator (insulator)201, and a coil 202. The stator core is an annular magnetic body centered on the central axis CA, and is a laminated body in which a plurality of electromagnetic steel plates are laminated in the axial direction. The stator core is held by the core holding portion 230. The insulator 201 is an insulating member using resin or the like. The insulator 201 covers at least a part of the stator core. The coil 202 is formed by winding a conductive wire around a stator core with an insulator 201 interposed therebetween.

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

The lead wires 3 are electrically connected to the stator 2. Specifically, a plurality of lead wires 3 are connected to the stator 2. The plurality of lead wires 3 are gathered into one wire. In addition, some of the leads 3 are connected to the circuit board 203, and the other leads 3 are connected to the coil 202. That is, the lead wire 3 has a portion disposed inside the motor 100.

Also, the lead wire 3 protrudes 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 wire 3 is connected to a Power Drive Unit (PDU), not shown, outside the motor 100. The PDU controls driving of the motor 100. Also, the PDU controls power supply to the motor 100.

Fig. 3 is a perspective view of the spindle 1 of the present embodiment. Fig. 3 shows a state where the lead 3 is inserted into the hole 10. Fig. 4 is a perspective view of the spindle 1 of the present embodiment viewed from one side thereof. Fig. 5 is a perspective view of the spindle 1 of the present embodiment viewed from the other side. In fig. 4 and 5, the sealing member 20 and the lid member 30 are omitted. Fig. 6 is a partial sectional view of the spindle 1 of the present embodiment. Fig. 6 shows a cross-sectional structure of the spindle 1 when the spindle 1 is cut along a plane including the central axis CA. Fig. 6 shows a state where the lead 3 is inserted into the hole 10. Fig. 7 is a perspective view of the lid member 30 of the present embodiment. Fig. 8 is an enlarged perspective view of the lid member 30 and its periphery of the present embodiment.

The main shaft 1 includes a hole 10 and a seal member 20. Further, the spindle 1 has a cover member 30.

The hole portion 10 extends from one side to the other side in the radial direction. The hole 10 has a first hole 11 and a second hole 12. Further, the hole portion 10 has a third hole 13.

The first hole 11 is open at one side of the main shaft 1. The opening of the first hole 11 is located at the flange portion 40. That is, the spindle 1 has the flange portion 40 where the opening of the first hole 11 is located. The flange 40 protrudes radially outward from the outer peripheral surface of the main shaft 1. That is, the flange portion 40 has a diameter larger than that of a portion of the main shaft 1 adjacent to the flange portion 40 in the axial direction.

Further, the flange portion 40 is located inside the motor 100. Therefore, the opening of the first hole 11 is located inside the motor 100.

The second hole 12 opens on the other side of the main shaft 1. The second hole 12 is connected to the first hole 11. That is, the hole 10 penetrates from one side to the other side in the radial direction. The lead 3 is disposed inside the first hole 11 and inside the second hole 12.

The second hole 12 opens at a position above the opening position of the first hole 11 in the main shaft 1. Specifically, the second hole 12 extends upward while being bent from the first hole 11. In addition, the opening of the second hole 12 is located at a portion of the spindle 1 protruding to the outside of the motor 100. That is, the opening of the second hole 12 is located outside the motor 100, while the opening of the first hole 11 is located inside the motor 100. Thereby, the lead wire 3 can be drawn out from the inside of the motor 100 to the outside through the hole portion 10.

For example, the circumferential opening position of the second hole 12 is deviated by about 180 ° in the circumferential direction with respect to the circumferential opening position of the first hole 11. However, the positional relationship in the circumferential direction between the opening of the first hole 11 and the opening of the second hole 12 is not particularly limited. A position deviated from the circumferential opening position of the first hole 11 by an angle of less than 180 ° in the circumferential direction may be set as the circumferential opening position of the second hole 12.

The third hole 13 opens on the outer peripheral surface of the spindle 1. Specifically, the third hole 13 is opened on the other side of the spindle 1, similarly to the second hole 12. However, the opening of the third hole 13 is located below the opening of the second hole 12 and inside the motor 100. Also, the third hole 13 is connected to the first hole 11.

For example, in the sealing step of sealing the first hole 11 with the sealing member 20, the third hole 13 serves as a resin injection hole. Further, the third hole 13 is used to confirm the filling state of the resin in the first hole 11 in the sealing process, for example. For example, when the first hole 11 is sufficiently filled with the resin, the resin overflows from the inside of the first hole 11 to the inside of the third hole 13. Thereby, the state of the resin overflowing into the third hole 13 is visually confirmed, and the filling state of the resin in the first hole 11 can be confirmed.

The constituent material of the sealing member 20 contains resin. For the sealing member 20, silicone resin may be used. For example, the sealing member 20 is made of a thermosetting resin. In addition, the sealing member 20 is exemplified by using a resin. As 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, the sealing member 20 is disposed inside the first hole 11.

The sealing member 20 blocks a gap between the inner peripheral surface of the first hole 11 and the outer surface of the lead wire 3 in the inside of the first hole 11. Specifically, the seal member 20 is in contact with the inner circumferential surface of the first hole 11. The sealing member 20 is in contact with the outer surface of the lead 3 in the inside of the first hole 11, and covers the lead 3. Thus, even if foreign matter enters hole 10 from the opening of second hole 12 located outside motor 100, it is possible to suppress the foreign matter from leaking out from the opening of first hole 11 located inside motor 100. That is, the intrusion of foreign matter from the outside of the motor 100 into the inside can be suppressed. The foreign matter includes liquid such as water. The foreign matter includes dust such as dust.

The sealing member 20 is disposed inside the third hole 13. The sealing member 20 is in contact with the inner peripheral surface of the third hole 13, and blocks the third hole 13. Thus, even if foreign matter enters hole portion 10 from the opening of second hole 12 located outside motor 100, it is possible to suppress foreign matter from leaking from the opening of third hole 13 located inside motor 100. That is, the intrusion of foreign matter from the outside of the motor 100 into the inside can be suppressed.

The cover member 30 extends in a cylindrical shape along the center axis CA. The cover member 30 is made of rubber, for example, and is attached to the spindle 1. However, the cover member 30 is not limited thereto, and may be a resin molded product. Further, the main shaft 1 having the cover member 30 may be cut out from a single material.

The lid member 30 is disposed on the flange portion 40. The cover member 30 covers the outer peripheral surface of the flange portion 40 from the radially outer side. The inner peripheral surface of the lid member 30 is in contact with the outer peripheral surface of the flange portion 40 over the entire periphery. However, although details will be described later, the seal member 20 is disposed in a portion between the inner peripheral surface of the lid member 30 and the outer peripheral surface of the flange portion 40.

The first hole 11 has an opening in the flange portion 40. Therefore, the first hole 11 is covered by the cover member 30 from the radial outside. That is, the inner peripheral surface of the cover member 30 covers the first hole 11. This can suppress the peeling of the sealing member 20 disposed inside the first hole 11. As a result, the intrusion of foreign matter from the outside of the motor 100 into the inside can be reliably suppressed. Further, the movement of the sealing member 20 located inside the first hole 11 is stopped by the lid member 30, and thus the sealing of the first hole 11 by the sealing member 20 can be reliably maintained.

When the molten resin that becomes the sealing member 20 by hardening is injected from the third hole 13 into the first hole 11, the cover member 30 prevents the molten resin from flowing radially outward from the first hole 11. Further, since the lid member 30 prevents the molten resin from flowing radially outward from the first hole 11, the sealing member 20 can be disposed at the opening of the first hole 11. That is, the positioning of the sealing member 20 can be performed by disposing the lid member 30.

Further, the opening of the third hole 13 is located below the upper end 30a of the cover member 30. In addition, the inner peripheral surface of the cover member 30 covers the third hole 13. This can suppress the peeling of the sealing member 20 disposed inside the third hole 13. As a result, the intrusion of foreign matter from the outside of the motor 100 into the inside can be reliably suppressed. Further, the movement of the sealing member 20 located inside the third hole 13 is prevented by the cover member 30, and thus the sealing of the third hole 13 by the sealing member 20 can be reliably maintained.

When the molten resin that becomes the sealing member 20 by hardening is injected from the third hole 13 into the first hole 11, the cover member 30 prevents the molten resin from flowing radially outward from the first hole 11. Further, since the flow of the molten resin from the first hole 11 to the outside in the radial direction can be prevented by the lid member 30, the sealing member 20 can be disposed at the opening of the third hole 13. That is, the positioning of the sealing member 20 can be performed by disposing the lid member 30.

Further, the opening of the third hole 13 is located at the flange portion 40. For example, the axial opening position of the third hole 13 is substantially the same as the axial opening position of the first hole 11. Thus, both the first hole 11 and the third hole 13 can be easily covered with a single cover member 30. Also, the axial length of the cover member 30 can be reduced.

The cover member 30 has a wiring hole 310. The wiring hole 310 penetrates from the radially inner side to the radially outer side of the cover member 30. Also, the opening of the wiring hole 310 overlaps with the opening of the first hole 11. For example, the entire opening of the wiring hole 310 is radially opposed to the opening of the first hole 11. The lead 3 is inserted into the wiring hole 310. That is, the lead 3 is disposed radially inward of the cover member 30 and radially outward of the cover member 30. In other words, the lead 30 protrudes radially outward from the radially inner side of the cover member 30 through the wiring hole 310. This can suppress the lead 3 from bending between the opening of the first hole 11 and the opening of the wiring hole 310. As a result, disconnection of the lead 3 can be suppressed. Further, since the cover member 30 is caught by the lead 3, the positional displacement of the cover member 30 in the axial direction can be suppressed.

Further, the lower end 30b of the cover member 30 contacts a holder upper end 210a (refer to fig. 2) which is the upper end of the spindle fixing portion 210. This can further suppress the positional displacement of the lid member 30 in the axial direction.

The seal member 20 has a first seal portion 21 disposed between the outer peripheral surface of the main shaft 1 and the inner peripheral surface of the cover member 30. The first seal portion 21 is in contact with the outer peripheral surface of the main shaft 1. Further, the first seal portion 21 is in contact with the inner peripheral surface of the cover member 30. The first seal portion 21 covers the opening of the first hole 11. This can reliably block the first hole 11. Further, since the inner peripheral surface of the cover member 30 contacts the first seal portion 21 from the radially outer side, the first seal portion 21 is prevented from being peeled off from the outer peripheral surface of the main shaft 1. Further, between the outer peripheral surface of the main shaft 1 and the inner peripheral surface of the cover member 30, the first seal portion 21 contacts the outer surface of the lead wire 3, thereby fixing the lead wire 3. This can suppress the movement of the lead 3.

The outer peripheral surface of the spindle 1 includes a region having a first surface roughness and a region having a second surface roughness greater than the first surface roughness. Specifically, the outer peripheral surface of the flange portion 40 has the second surface roughness. That is, the cover member 30 is disposed in the region having the second surface roughness. In this structure, the first seal portion 21 is in contact with the outer peripheral surface of the flange portion 40 having the second surface roughness in the outer peripheral surface of the main shaft 1. Thereby, the first seal portion 21 enters the irregularities of the outer peripheral surface of the flange portion 40 having the second surface roughness, and the fixing effect becomes large. As a result, the first sealing part 21 can be further inhibited from peeling.

Here, the inner circumferential surface of the cover member 30 has a first recess 31 recessed outward in the radial direction. The first recess 31 faces the opening of the first hole 11. For example, the first recess 31 faces the entire opening of the first hole 11 in the radial direction.

The first seal portion 21 is disposed inside the first recess 31. In the sealing step of sealing the first hole 11 with the sealing member 20, resin is injected from the third hole 13 until the first recess 31 is filled with resin. Then, the opening of the first hole 11 is covered with the cured resin inside the first recess 31 by curing the resin. The cured resin in the first recess 31 is a portion of the sealing member 20 disposed between the outer peripheral surface of the spindle 1 and the inner peripheral surface of the cover member 30. That is, the cured resin in the first recess 31 becomes the first seal portion 21. Thereby, the sealing member 20 having the first sealing portion 21 can be easily formed.

Further, by disposing the first seal portion 21 inside the first recess 31, the thickness of the first seal portion 21 in the radial direction can be increased. This increases the strength of the first seal portion 21, and can suppress breakage of the first seal portion 21. As a result, the first hole 11 can be reliably closed by the first seal portion 21.

For example, the first recess 31 covers the entire opening of the first hole 11 from the radially outer side. However, the present invention is not limited to this, and at least a part of the opening of the first hole 11 may be opposed to the first recess 31 in the radial direction. That is, the center position in the circumferential direction of the first recess 31 may be offset in the circumferential direction with respect to the opening center of the first hole 11.

The first recess 31 has an opening at the upper end 30a of the cover member 30. In addition, the first recess 31 extends from the upper end 30a to the lower end 30b of the cover member 30. Thus, the inside of the first concave portion 31 can be visually confirmed from the upper end 30a side of the cover member 30. Here, in the sealing process of sealing the first hole 11 with the sealing member 20, the opening of the first hole 11 can be seen before the resin injected from the third hole 13 is sufficiently filled in the first hole 11. On the other hand, when the first hole 11 is sufficiently filled with the resin, the opening of the first hole 11 is shielded, and the amount of the resin in the first recess 31 increases. As a result, the filling state of the resin in the first hole 11 can be easily confirmed by visually observing the inside of the first concave portion 31 from the upper end 30a side of the lid member 30.

The shape of the first recess 31 is not particularly limited. For example, the first concave portion 31 has a shape cut away from a radially inner side toward a radially outer side when viewed from above. That is, the first recess 31 is a portion having a smaller wall thickness than the other portion of the cover member 30 as viewed from above.

The seal member 20 has a second seal portion 22 disposed between the outer peripheral surface of the main shaft 1 and the inner peripheral surface of the cover member 30. The second seal portion 22 is in contact with the outer peripheral surface of the main shaft 1. Also, the second seal portion 22 is in contact with the inner peripheral surface of the cover member 30. The second seal portion 22 covers the opening of the third hole 13. This can reliably block the third hole 13. Further, since the inner peripheral surface of the cover member 30 contacts the second seal portion 22 from the radially outer side, the second seal portion 22 is prevented from being peeled off from the outer peripheral surface of the main shaft 1.

The second seal portion 22 is in contact with the outer peripheral surface of the flange portion 40 having the second surface roughness in the outer peripheral surface of the main shaft 1. Thereby, the second seal portion 22 enters the irregularities of the outer peripheral surface of the flange portion 40 having the second surface roughness, and the fixing effect is increased. As a result, the second sealing portion 22 can be further suppressed from peeling.

Here, the inner circumferential surface of the lid member 30 has a second recess 32 recessed radially outward. The second recess 32 faces the opening of the third hole 13. For example, the second recess 32 faces the entire opening of the third hole 13 in the radial direction.

The second sealing portion 22 is disposed inside the second recess 32. In the sealing step of sealing the first hole 11 with the sealing member 20, the second recess 32 is also filled with resin. Then, the opening of the third hole 13 is covered with the hardened resin inside the second recess 32 by hardening the resin. The cured resin in the second recess 32 is a portion of the sealing member 20 disposed between the outer peripheral surface of the spindle 1 and the inner peripheral surface of the cover member 30. That is, the cured resin in the second recess 32 serves as the second sealing portion 22. Thereby, the sealing member 20 having the second sealing portion 22 can be easily formed.

Further, by disposing the second seal portion 22 inside the second recess 32, the thickness of the second seal portion 22 in the radial direction can be increased. This increases the strength of the second seal portion 22, and can suppress breakage of the second seal portion 22. As a result, the third hole 13 can be reliably closed by the second sealing portion 22.

For example, the second recess 32 covers the entire opening of the third hole 13 from the radially outer side. However, the present invention is not limited to this, and at least a part of the opening of the third hole 13 may be opposed to the second recess 32 in the radial direction. That is, the circumferential center position of the second recess 32 may be offset in the circumferential direction with respect to the opening center of the third hole 13.

The second recess 32 has an opening at the upper end 30a of the cover member 30. In addition, the second recess 32 extends from the upper end 30a to the lower end 30b of the cover member 30. For example, in the sealing step of sealing the first hole 11 with the sealing member 20, an injection nozzle that discharges resin may be used. At this time, the resin can be easily injected by inserting an injection nozzle from the upper end 30a side of the lid member 30 to the inside of the second recess 32 and ejecting the resin.

For example, the second recess 32 may be obtained by protruding a part of the outer peripheral surface of the cover member 30 in the radially outward direction. Specifically, the outer peripheral surface of the cover member 30 has a protruding portion 33 protruding outward in the radial direction. Further, the inner peripheral surface of the cover member 30 has a second recess 32 radially inward of the protrusion 33. This can increase the concavity of the second concave portion 32. In other words, the second recess 32 can be recessed radially by a larger amount than the wall thickness of the cover member 30. For example, the first recess 31 has a shape in which the amount of radial depression is smaller than the wall thickness of the cover member 30. On the other hand, the second recess 32 can be formed in a shape having a larger amount of radial depression than the first recess 31. Thereby, the second recess 32 into which the injection nozzle can be inserted can be easily obtained.

Further, a space may be provided between the outer peripheral surface of the flange portion 40 and the lid member 30 over the entire periphery. The sealing member 20 may be disposed over the entire area between the outer peripheral surface of the flange portion 40 and the lid member 30. That is, the outer peripheral surface of the flange portion 40 may be covered with the sealing member 20 over the entire periphery.

The lid member 30 is disposed on the flange portion 40. However, the flange portion 40 has a portion exposed from the cover member 30. Specifically, the upper end 30a of the lid member 30 is located below the upper end 40a of the flange 40. That is, the upper end 40a of the flange portion 40 is exposed from the cover member 30. Thus, even if another member is disposed in a portion of the main shaft 1 adjacent to the flange 40 at the upper side, the upper end 30a of the lid member 30 can be prevented from contacting the other member. For example, a bearing 101 is disposed above the flange portion 40. In this structure, the upper end 30a of the cover member 30 can be suppressed from contacting the bearing 101.

The first upper end portion 21a, which is the upper end portion of the first seal portion 21, is located below the upper end 30a of the lid member 30. That is, the first upper end portion 21a is located below the upper end 40a of the flange portion 40. Thus, even if another member is disposed in the portion of the main shaft 1 adjacent to the flange 40 at the upper side, the first upper end portion 21a can be prevented from contacting another member.

For example, a bearing 101 (see fig. 2) is disposed in a portion of the main shaft 1 adjacent to the flange 40 at the upper side. The bearing 101 has an inner ring 101a and an outer ring 101 b. The inner ring 101a is fixed to the outer peripheral surface of the main shaft 1. The outer race 101b is fixed to the first cover 111. The inner ring 101a does not rotate. The outer ring 101b rotates relative to the inner ring 101 a. Here, the axial positioning of the bearing 101 is performed by bringing the inner ring 101a into contact with the upper end 40a of the flange 40. In this structure, the first upper end portion 21a of the first seal portion 21 can be suppressed from contacting the outer ring 101b of the bearing 101. This can suppress a malfunction of the bearing 101.

The second upper end 22a, which is the upper end of the second sealing portion 22, is located below the upper end 30a of the lid member 30. That is, the second upper end portion 22a is located below the upper end 40a of the flange portion 40. This also suppresses the contact of the second upper end 22a with the outer ring 101b of the bearing 101.

The cover member 30 has a gap portion 320. The gap portion 320 extends from the upper end 30a to the lower end 30b of the cover member 30, and penetrates radially inward to radially outward from the cover member 30. Specifically, the cover member 30 has a pair of end surfaces 32a and 32b facing each other in the circumferential direction. The region between the end faces 32a and 32b is a gap 320. That is, the cover member 30 is divided in the circumferential direction by the gap portion 320. Here, the cover member 30 is made of rubber and is elastically deformable. This can widen the gap of the gap portion 320, and thus the lid member 30 can be fitted to the flange portion 40 via the gap portion 320. As a result, workability in fitting the lid member 30 to the flange portion 40 is improved.

For example, the end faces 32a and 32b contact each other. However, the present invention is not limited to this, and a space may be provided between the end surfaces 32a and 32 b.

Fig. 9 is a perspective view of a cover member 30 of a modification.

In the modification, the cover member 30 has the gap portion 320. The gap 320 extends from the upper end 30a of the lid member 30 to the lower end 30b of the lid member 30 via the wiring hole 310, and penetrates radially inward and radially outward of the lid member 30. The gap portion 320 is a region between the pair of end surfaces 32a and 32b facing each other in the circumferential direction. Specifically, the gap portion 320 includes a first gap portion 321 extending from the upper end 30a and a second gap portion 322 extending from the lower end 30 b. The first gap 321 and the second gap 322 are connected to the wiring hole 310.

In the modification, the gap of the gap portion 320 can be widened, and thus the lid member 30 can be fitted to the flange portion 40 through the gap portion 320. As a result, workability in fitting the lid member 30 to the flange portion 40 is improved. Further, the interval of the gap portion 320 is widened, thereby dividing the wiring hole 310 into two. Thus, for example, even in a state where the lead 3 protrudes from the opening of the first hole 11 located in the flange portion 40, the lid member 30 can be fitted to the flange portion 40. That is, the degree of freedom of the operation sequence is improved.

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

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

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

Claims (18)

1. A motor, comprising:

a main shaft disposed along a vertically extending central axis;

a stator mounted to the main shaft; and

a lead wire electrically connected to the stator,

the main shaft has:

a hole portion extending from one side of the radial direction to the other side; and

a sealing member disposed in at least a part of the hole,

the hole portion has:

a first hole opened at the one side of the main shaft; and

a second hole opened at the other side of the main shaft and connected to the first hole,

the sealing member is disposed inside the first hole,

the lead is disposed inside the first hole and inside the second hole,

the main shaft has a cover member extending in a cylindrical shape along the center axis,

the inner peripheral surface of the cover member covers the first hole.

2. The motor of claim 1,

the sealing member has: a first seal portion disposed between an outer peripheral surface of the main shaft and an inner peripheral surface of the cover member,

the first seal portion covers an opening of the first hole.

3. The motor of claim 2,

the inner peripheral surface of the cover member has a first recess recessed radially outward,

the first recess is opposed to an opening of the first hole,

the first seal portion is disposed inside the first recess.

4. The motor of claim 3,

the first recess has an opening at an upper end of the cover member, extending from the upper end to a lower end of the cover member.

5. The motor of claim 4,

a first upper end portion, which is an upper end portion of the first seal portion, is located below an upper end of the lid member.

6. The motor of claim 5,

the hole portion has a third hole,

the third hole is connected to the first hole and opened to an outer circumferential surface of the main shaft,

the sealing member is disposed inside the third hole.

7. The motor of claim 6,

the opening of the third hole is located further below the upper end of the cover member,

an inner peripheral surface of the cover member covers the third hole.

8. The motor of claim 6,

the main shaft has a flange portion where an opening of the first hole is located,

the flange portion protrudes radially outward from an outer peripheral surface of the main shaft,

the opening of the third hole is located at the flange portion.

9. The motor of claim 6,

the seal member has: a second seal portion disposed between an outer peripheral surface of the main shaft and an inner peripheral surface of the cover member,

the second seal portion covers an opening of the third hole.

10. The motor of claim 9,

the inner peripheral surface of the cover member has a second recess recessed radially outward,

the second recess is opposed to the opening of the third hole,

the second seal portion is disposed inside the second recess.

11. The motor of claim 10,

the second recess has an opening at an upper end of the cover member extending from the upper end to a lower end of the cover member.

12. The motor of claim 11,

a second upper end portion, which is an upper end portion of the second sealing portion, is located below an upper end of the lid member.

13. The motor of claim 12,

the outer peripheral surface of the cover member has a protruding portion protruding outward in the radial direction,

the inner peripheral surface of the cover member has the second recess portion radially inward of the protruding portion.

14. The motor of claim 1,

the cover member has a wiring hole formed therein,

the wiring hole penetrates from the radial inner side to the radial outer side of the cover member,

the opening of the wiring hole overlaps with the opening of the first hole,

the lead wire is disposed radially inward of the cover member and radially outward of the cover member.

15. The motor of claim 14,

the cover member has a gap portion formed therein,

the gap portion extends from an upper end of the cover member to a lower end of the cover member via the wiring hole, and penetrates from a radially inner side to a radially outer side of the cover member.

16. The motor of claim 14,

the cover member has a gap portion formed therein,

the gap portion extends from an upper end to a lower end of the cover member, and penetrates from a radially inner side to a radially outer side of the cover member.

17. The motor of claim 16,

the stator has a stator holder which is provided with a stator holder,

the stator holder has a main shaft fixing part extending in a cylindrical shape along the central axis,

the inner peripheral surface of the main shaft fixing part is fixed on the outer peripheral surface of the main shaft,

the lower end of the cover member is in contact with the upper end of a holder as the upper end of the spindle fixing portion.

18. The motor according to any one of claims 1 to 17,

the outer peripheral surface of the spindle includes a region having a first surface roughness and a region having a second surface roughness larger than the first surface roughness,

the cover member is disposed in a region having the second surface roughness.

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