Stator

Abstract

A stator according to the present disclosure is a stator inserted into an annular member. The stator is provided with: a cylindrical stator core; a coil provided on the stator core and having a coil end protruding axially outward from an axial end surface of the stator core; and a cylindrical cover part which is provided so as to cover the coil end part and protrudes outward in the axial direction from the axial end surface of the stator core part, the cover part having a seal attachment part to which a seal is attached, the seal sealing a gap between the ring member and the cover part, and the cylindrical cover part being provided so as to cover the coil end part and protruding outward in the axial direction from the axial end surface of the stator core part. The seal attachment portion has an annular groove shape formed by being recessed toward the inside in the radial direction from the outer peripheral surface of the cover portion, and is open by extending to the end portion of the cover portion on the outside in the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a stator of an electric motor or the like. Background Art

[0002] The molded stator, which is formed by covering the coil ends protruding from the axial ends of the cylindrical stator core with resin, is waterproof and dustproof on the assembled machine side. In addition, in the molded stator, a cylindrical cooling jacket covering the outer periphery of the stator is sometimes provided. When foreign matter penetrates into the gap between the cooling jacket and the resin of the stator, it will cause the deterioration of the insulation performance. When the insulation performance of the molded stator deteriorates, it is possible to cause failure. Therefore, it is conceivable to provide a seal between the cooling jacket and the resin of the stator to seal the gap between the cooling jacket and the resin of the stator. Although the reasons are different, there have been various proposals for sealing the gap between the cooling jacket and the resin of the stator by a seal.

[0003] Background Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2013-527740 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In the past, when the seal is to be removed, the cooling jacket must be removed from the stator. Therefore, in the past, maintenance requires labor and time. Therefore, a stator that can improve maintainability with a simple structure is desired.

[0008] Solutions for solving problems

[0009] A technical solution disclosed herein is a stator, which is inserted into a circular ring component, wherein the stator comprises: a cylindrical stator core; a coil, which is arranged on the stator core and has a coil end protruding axially outward from the axial end surface of the stator core; and a cylindrical covering portion, which is arranged in a manner covering the coil end and protruding axially outward from the axial end surface of the stator core, the covering portion having a seal mounting portion, on which a seal is mounted, the seal sealing the gap between the circular ring component and the covering portion, the seal mounting portion being in the shape of an annular groove formed by being recessed radially inward on the outer circumferential surface of the covering portion, and extending to the axially outer end of the covering portion and opening.

[0010] Effects of the Invention

[0011] According to one aspect, it is possible to provide a stator capable of improving maintainability with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic longitudinal sectional view showing a usage state of the stator according to the first embodiment of the present invention.

[0013] Figure 2 This is a schematic longitudinal sectional view showing a use state of a stator according to a second embodiment of the present invention, and a part is shown in an enlarged manner in the view showing a state before being sealed by a sealing member.

[0014] Figure 3 This is a schematic longitudinal sectional view showing a use state of a stator according to a second embodiment of the present invention, and a part is shown in an enlarged manner in the figure showing a state after being sealed by a seal member.

[0015] Figure 4 It is a schematic longitudinal sectional view showing a modified example of the stator of the second embodiment in a usage state, and shows a part in an enlarged manner.

[0016] Figure 5 It is a schematic longitudinal sectional view showing a usage state of a stator according to a third embodiment of the present invention, and shows a part in an enlarged manner.

[0017] Figure 6 It is a schematic longitudinal sectional view showing a usage state of a first modified example of the stator of the third embodiment, and shows a part in an enlarged manner.

[0018] Figure 7 It is a schematic longitudinal sectional view showing a usage state of a second modified example of the stator of the third embodiment, and shows a part in an enlarged manner.

[0019] Figure 8 It is a schematic longitudinal sectional view showing a usage state of a stator according to a fourth embodiment of the present invention, and shows a part in an enlarged manner.

[0020] Fig. 9 It is a schematic longitudinal sectional view showing a usage state of a modified example of the stator of the fourth embodiment, and shows a part in an enlarged manner. DETAILED DESCRIPTION

[0021] Hereinafter, a stator according to one embodiment of the present disclosure will be described with reference to the accompanying drawings. Figure 1 The stator 1 of the first embodiment is described. The stator 1 is used together with a rotor (not shown) in an electric motor for providing power to a rotating machine. The stator 1 includes a cylindrical stator core 2, a coil 3 provided on the stator core 2, and a cylindrical cover 4, 4' provided on the stator core 2. In addition, the device using the stator 1 is not limited to an electric motor, and may be, for example, a generator.

[0022] The stator core 2 is cylindrical with both ends open in the axial direction J1 and is made of magnetic material. The stator core 2 has a plurality of teeth (not shown) protruding radially inward from the inner circumference. The plurality of teeth extend along the axial direction J1 of the stator core 2. The plurality of teeth are arranged in a circumferential direction of the stator core 2.

[0023] Coils 3 are mounted on the plurality of teeth, respectively. When mounted on the stator 1, the coil 3 protrudes from one end surface of the axial direction J1 of the stator core 2 toward one side of the axial direction J1, and protrudes from the other end surface of the axial direction J1 of the stator core 2 toward the other side of the axial direction J1. Thus, the coil 3 has coil ends 5, 5' protruding from the end surface of the axial direction J1 of the stator core 2 toward the outside of the axial direction J1.

[0024] The stator core 2 is provided with covers 4 and 4' in a manner covering each coil end 5 and 5'. One of the covers 4 and 4' is provided on the stator core 2 in a manner covering the coil end 5 protruding from one end of the axial direction J1 of the stator core 2 to one side of the axial direction J1, and the other cover 4' is provided in a manner covering the coil end 5' protruding from the other end of the axial direction J1 of the stator core 2 to the other side of the axial direction J1. When the one cover 4 covers the coil end 5, it is in a cylindrical shape protruding from one end of the axial direction J1 of the stator core 2 to one side of the axial direction J1. When the other cover 4' covers the coil end 5', it is in a cylindrical shape protruding from the other end of the axial direction J1 of the stator core 2 to the other side of the axial direction J1. In this way, the covers 4 and 4' are in a cylindrical shape extending in the axial direction J1 and protruding from the end of the axial direction J1 of the stator core 2 to the outside of the axial direction J1. The covers 4 and 4' are made of resin.

[0025] The stator 1 of such a structure is inserted into a cylindrical annular member 6. The annular member 6 is a member covering the outer periphery of the stator 1, and the stator 1 is fixed to the inner periphery of the annular member 6. The annular member 6 is, for example, a cooling jacket for cooling the stator 1. In this case, the annular member 6 has a spiral groove 7 on the outer periphery. The groove 7 opens to the radially outer side of the annular member 6. The opening of the groove 7 is closed by a cylindrical frame not shown, which covers the outer periphery of the annular member 6. Thus, a refrigerant passage consisting of the groove 7 with the opening closed is formed between the annular member 6 and the frame. The refrigerant for cooling the stator 1 passes through the refrigerant passage. The refrigerant is supplied to the refrigerant passage from a supply port formed in the frame. The refrigerant supplied to the refrigerant passage from the supply port is discharged to the outside from a discharge port formed in the frame after passing through the spiral refrigerant passage.

[0026] When the stator 1 is inserted into the annular member 6, ideally there is no gap between the annular member 6 and one covering portion 4 and between the annular member 6 and the other covering portion 4'. However, in reality, tiny gaps 8 and 8' are formed for reasons described later. Since the shape and path of the gaps 8 and 8' also vary depending on the accuracy and temperature of the annular member 6 and the covering portions 4 and 4' themselves, there are various situations, but the gaps 8 and 8' are connected to the stator core 2 and the coil 3. In addition, for the sake of convenience, in Figure 1 The gap 8 between the annular member 6 and one cover portion 4 opens to one side of the axial direction J1, which is the outer side of the axial direction J1, and the gap 8' between the annular member 6 and the other cover portion 4' opens to the other side of the axial direction J1, which is the outer side of the axial direction J1.

[0027] In this way, gaps 8, 8' are formed between the annular member 6 and the covering portions 4, 4', which are open to the outside of the axial direction J1. If the outer diameter of the covering portions 4, 4' is formed to be slightly larger than the outer diameter of the stator core 2 in advance in order not to form the gaps 8, 8', and the stator is fixed to the annular member by shrink fit, the covering portion may break due to the stress applied to the covering portion at that time. Even if it does not break under this condition, during the driving process of the motor, the covering portion will expand due to heat, thereby further applying force to the covering portion from the annular member. When force is applied to the covering portion in this way, the risk of the covering portion breaking may be further increased. Therefore, it is usually impossible to avoid the formation of gaps 8, 8' between the annular member 6 and the covering portions 4, 4'.

[0028] When gaps 8, 8' are formed between the annular member 6 and the covering parts 4, 4', there is a possibility that foreign matter such as liquid and dust may enter the gaps 8, 8' during use of the stator 1. If foreign matter enters the gaps 8, 8', the insulation performance may be deteriorated, and the stator 1 may fail. Therefore, the openings of the gaps 8, 8' are sealed by seals 9, 9'. In the example shown in the figure, the seals 9, 9' are elastically deformable O-rings.

[0029] One covering portion 4 and the other covering portion 4' have seal mounting portions 10, 10', on which seals 9, 9' are mounted for sealing the openings of the gaps 8, 8'. The seal mounting portion 10 of the one covering portion 4 is in the shape of an annular groove along the circumference of the covering portion 4. Specifically, the seal mounting portion 10 is in the shape of an annular groove that is recessed radially inward on the outer circumference of the covering portion 4, and is open to the end of the outer side of the axial J1 of the covering portion 4 that is one side of the axial J1. The seal mounting portion 10 is a small diameter portion in the cylindrical covering portion 4 with a step. The seal mounting portion 10' of the other covering portion 4' is basically the same structure as the seal mounting portion 10 of the one covering portion 4. However, in the case of the seal mounting portion 10' of the other covering portion 4', the outer side of the axial J1 is the other side of the axial J1.

[0030] In the case of the stator 1 of the first embodiment, the covering parts 4 and 4' have seal mounting parts 10 and 10', and seals 9 and 9' are installed on the seal mounting parts 10 and 10'. The seals 9 and 9' seal the gaps 8 and 8' between the annular member 6 and the covering parts 4 and 4'. The seal mounting parts 10 and 10' have the aforementioned structure. Due to such a structure, it is easy to remove the seals 9 and 9' installed on the seal mounting parts 10 and 10' from the seal mounting parts 10 and 10' via the openings of the gaps 8 and 8'. Afterwards, it is easy to install new seals 9 and 9' on the seal mounting parts 10 and 10' via the openings of the gaps 8 and 8'. Therefore, according to the stator 1 of the first embodiment, when replacing the seals 9 and 9', it is not necessary to remove the stator 1 from the annular member 6, so it is possible to use a simple structure to seek to improve the maintainability.

[0031] Next, use Figure 2 and Figure 3 The stator of the second embodiment of the present invention will be described. In addition, since the structural components having the same reference numerals as those of the first embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1a of the second embodiment is different from that of the first embodiment in the structure of the seal mounting portion 10 of the cover portion 4. Here, one of the cover portions 4 and the other cover portion is described.

[0032] The seal mounting portion 10 includes a seal configuration portion 11 and a seal introduction portion 12. The seal configuration portion 11 is located on the inner side of the axial direction J1 of the cover portion 4, which is the other side of the axial direction J1, and the seal introduction portion 12 is located on the outer side of the axial direction J1 of the cover portion 4, which is one side of the axial direction J1. The seal configuration portion 11 is capable of configuring the seal 9. The seal 9 seals the opening of the gap 8 between the annular member 6 and the cover portion 4 when configured in the seal configuration portion 11. The seal introduction portion 12 includes an open end of the seal mounting portion 10. The seal introduction portion 12 introduces the seal 9 from the open end of the seal mounting portion 10 into the seal configuration portion 11. That is, the seal introduction portion 12 introduces the seal 9 from the opening of the gap 8 into the inner side of the seal mounting portion 10.

[0033] like Figure 2 and Figure 3 As shown, the outer peripheral surface 13 of the portion of the covering portion 4 corresponding to the seal configuration portion 11 is continuous with the outer peripheral surface 14 of the portion of the covering portion 4 corresponding to the seal introduction portion 12. The outer diameter of the outer peripheral surface 13 of the portion of the covering portion 4 corresponding to the seal configuration portion 11 increases from the portion connected to the outer peripheral surface 14 of the portion of the covering portion 4 corresponding to the seal introduction portion 12 as it goes inward in the axial direction J1 of the covering portion 4. Specifically, the outer peripheral surface 13 of the portion of the covering portion 4 corresponding to the seal configuration portion 11 is tapered in a manner that expands in diameter as it goes inward in the axial direction J1 of the covering portion 4. In this way, the outer diameter of the outer peripheral surface 14 of the portion of the covering portion 4 corresponding to the seal introduction portion 12 is smaller than the outer diameter of the outer peripheral surface 13 of the portion of the covering portion 4 corresponding to the seal configuration portion 11.

[0034] In the case of the stator 1a of the second embodiment, the seal 9 is inserted into the seal introduction portion 12 from the opening of the gap 8. Figure 2 As shown in FIG. 1 , the seal 9 is inserted into the seal introduction portion 12 and protrudes outward in the axial direction J1 of the cover portion 4. Figure 3 As shown, the stator 1a is fixed to the counterpart member 15 in a state where the seal 9 is inserted into the seal introduction portion 12. The stator 1a is fixed to the counterpart member 15 by screwing the bolt member 17 into the threaded hole 16 of the stator 1a through the counterpart member 15. When the stator 1a is fixed to the counterpart member 15, the seal 9 located in the seal introduction portion 12 is pushed inwardly in the axial direction J1 of the cover portion 4 by the counterpart member 15. As a result, the seal 9 is pushed from the seal introduction portion 12 into the seal arrangement portion 11. The seal 9 seals the opening of the gap 8 in a state where it is pushed into the seal arrangement portion 11.

[0035] The seal mounting portion of the other cover part is basically the same structure as the seal mounting portion 10 of the one cover part 4. However, in the case of the seal mounting portion of the other cover part, the outer side in the axial direction J1 is the other side of the axial direction J1, and the inner side in the axial direction J1 is one side of the axial direction J1. In the seal mounting portion of the other cover part, a seal is mounted in the same manner as in the case of the one seal mounting portion 10.

[0036] In the case of the stator 1a of the second embodiment, the seal 9 is pushed into the seal arrangement portion 11 with a small gap while being elastically deformed. In addition, since the seal 9 is pushed into the seal arrangement portion 11 with a small gap, the contact area with the outer peripheral surface of the cover portion 4 and the inner peripheral surface of the annular member 6 increases. Therefore, according to the stator 1a of the second embodiment, the opening of the gap 8 can be sealed more firmly.

[0037] Next, use Figure 4 A modified example of the stator of the second embodiment will be described. In addition, since the components having the same reference numerals as those of the first embodiment and the second embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1b of this modified example is different from the second embodiment in the structure of the seal arrangement portion 11 of the seal mounting portion 10. Here, one of the cover portions 4 and the other cover portion is described.

[0038] The outer diameter of the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal arrangement portion 11 increases from the portion connected to the outer peripheral surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12 as it goes to the inner side of the axial direction J1 which is the other side of the axial direction J1 of the cover 4. Specifically, Figure 4 As shown, the outer peripheral surface 13 of the portion of the cover portion 4 corresponding to the seal arrangement portion 11 bulges outward in the radial direction of the cover portion 4. The longitudinal section shape of the outer peripheral surface 13 of the portion of the cover portion 4 corresponding to the seal arrangement portion 11 is in the shape of a curve bulging outward in the radial direction of the cover portion 4. For example, the longitudinal section shape of the outer peripheral surface 13 of the portion of the cover portion 4 corresponding to the seal arrangement portion 11 is in the shape of an arc bulging outward in the radial direction of the cover portion 4.

[0039] In the case of the stator 1b of this modification, the seal 9 is mounted on the seal mounting portion 10 similarly to the case of the second embodiment. Specifically, the seal 9 is pushed into the seal placement portion 11 from the seal introduction portion 12 by the mating member 15 .

[0040] The seal mounting portion of the other cover part is basically the same structure as the seal mounting portion 10 of the one cover part 4. However, in the case of the seal mounting portion of the other cover part, the outer side in the axial direction J1 is the other side of the axial direction J1, and the inner side in the axial direction J1 is one side of the axial direction J1. In the seal mounting portion of the other cover part, a seal is mounted in the same manner as in the case of the one seal mounting portion 10.

[0041] Next, use Figure 5 The stator of the third embodiment of the present invention will be described. In addition, since the structural components having the same reference numerals as those of the first embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1c of the third embodiment is different from that of the first embodiment in the structure of the seal mounting portion 10 of the cover portion 4. Here, one of the cover portions 4 and the other cover portion is described.

[0042] The outer diameter of the outer peripheral surface 18 of the portion of the cover portion 4 corresponding to the seal mounting portion 10 increases from the end portion of the cover portion 4 on the outer side in the axial direction J1, which is one side in the axial direction J1, toward the end portion of the cover portion 4 on the inner side in the axial direction J1, which is the other side in the axial direction J1. Specifically, the outer peripheral surface 18 of the portion of the cover portion 4 corresponding to the seal mounting portion 10 is tapered so as to expand in diameter toward the inner side in the axial direction J1 of the cover portion 4.

[0043] In the case of the stator 1c of the third embodiment, the seal 9 is mounted on the seal mounting portion 10 in the same manner as in the case of the second embodiment. Specifically, the seal 9 is pushed into the inner side of the seal mounting portion 10 from the near front side of the seal mounting portion 10 by the counterpart member 15. Thus, the seal 9 is pushed from the portion with a larger gap on the outside in the axial direction J1 to the portion with a smaller gap on the inside in the axial direction J1. Therefore, according to the stator 1c of the third embodiment, as in the case of the second embodiment, the opening of the gap 8 can be more firmly sealed with a simple structure.

[0044] The seal mounting portion of the other cover part is basically the same structure as the seal mounting portion 10 of the one cover part 4. However, in the case of the seal mounting portion of the other cover part, the outer side in the axial direction J1 is the other side of the axial direction J1, and the inner side in the axial direction J1 is one side of the axial direction J1. In the seal mounting portion of the other cover part, a seal is mounted in the same manner as in the case of the one seal mounting portion 10.

[0045] Next, use Figure 6The first variant of the stator of the third embodiment is described. In addition, since the components having the same reference numerals as those of the first embodiment and the third embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1d of the first variant is different from that of the third embodiment in the structure of the seal mounting portion 10. Here, one of the cover portions 4 and the other cover portion is described.

[0046] The outer diameter of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 increases from the end portion of the cover 4 on the outer side of the axial direction J1 which is one side of the axial direction J1 toward the end portion of the cover 4 on the inner side of the axial direction J1 which is the other side of the axial direction J1. Specifically, the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 bulges outward in the radial direction of the cover 4. The longitudinal section shape of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 is in the shape of a curve bulging outward in the radial direction of the cover 4. For example, the longitudinal section shape of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 is in the shape of an elliptical arc bulging outward in the radial direction of the cover 4.

[0047] In the case of the stator 1d of the first modified example, the seal 9 is pushed into the inner side of the seal mounting portion 10 from the near front side of the seal mounting portion 10 by the counterpart member 15 as in the case of the second embodiment described above. In addition, the seal mounting portion of the other covering portion is basically the same structure as the seal mounting portion 10 of the one covering portion 4. However, in the case of the seal mounting portion of the other covering portion, the outer side of the axial direction J1 is the other side of the axial direction J1, and the inner side of the axial direction J1 is one side of the axial direction J1. In the seal mounting portion of the other covering portion, a seal is mounted as in the case of the one seal mounting portion 10.

[0048] Next, use Figure 7 The second variant of the stator of the third embodiment is described. In addition, since the components having the same reference numerals as those of the first embodiment and the third embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1e of the second variant is different from that of the third embodiment in the structure of the seal mounting portion 10. Here, one of the cover portions 4 and the other cover portion is described.

[0049] The outer diameter of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 increases from the end portion of the cover 4 on the outer side in the axial direction J1, which is one side of the axial direction J1, toward the end portion of the cover 4 on the inner side in the axial direction J1, which is the other side of the axial direction J1. Specifically, the outer side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 is recessed toward the radial inner side of the cover 4, and the inner side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 bulges toward the radial outer side of the cover 4. The longitudinal cross-sectional shape of the outer side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 is a curved shape recessed toward the radial inner side of the cover 4. The longitudinal cross-sectional shape of the inner side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover 4 corresponding to the seal mounting portion 10 is a curved shape bulging toward the radial outer side of the cover 4. The outer side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover portion 4 corresponding to the seal mounting portion 10 is smoothly continuous with the inner side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover portion 4 corresponding to the seal mounting portion 10 .

[0050] In the case of the stator 1e of the second modified example, the seal 9 is pushed into the inner side of the seal mounting portion 10 by the counterpart member 15 from the front side of the seal mounting portion 10 as in the case of the second embodiment. According to the stator 1e of the second modified example, since the outer side in the axial direction J1 of the outer peripheral surface 18 of the portion of the cover portion 4 corresponding to the seal mounting portion 10 is recessed, the seating of the seal 9 can be improved.

[0051] The seal mounting portion of the other cover part is basically the same structure as the seal mounting portion 10 of the one cover part 4. However, in the case of the seal mounting portion of the other cover part, the outer side in the axial direction J1 is the other side of the axial direction J1, and the inner side in the axial direction J1 is one side of the axial direction J1. In the seal mounting portion of the other cover part, a seal is mounted in the same manner as in the case of the one seal mounting portion 10.

[0052] Next, use Figure 8 The stator of the fourth embodiment of the present invention is described. In addition, since the structural components having the same reference numerals as those of the first embodiment have the same functions, the description thereof is sometimes omitted below. The stator 1f of the fourth embodiment is different from that of the first embodiment in the structure of the seal mounting portion 10 of the cover portion 4. Here, one of the cover portions 4 and the other cover portion is described.

[0053] The seal mounting portion 10 includes a seal configuration portion 11 and a seal introduction portion 12, wherein the seal configuration portion 11 is located on the inner side of the axial direction J1 of the cover portion 4, which is the other side of the axial direction J1, and the seal introduction portion 12 is located on the outer side of the axial direction J1 of the cover portion 4, which is one side of the axial direction J1. The seal configuration portion 11 is capable of configuring the seal 9. The seal 9 seals the opening of the gap 8 between the annular member 6 and the cover portion 4 when configured in the seal configuration portion 11. The seal introduction portion 12 includes an open end of the seal mounting portion 10. The seal introduction portion 12 introduces the seal 9 from the open end of the seal mounting portion 10 into the seal configuration portion 11. That is, the seal introduction portion 12 introduces the seal 9 from the opening of the gap 8 into the inner side of the seal mounting portion 10.

[0054] like Figure 8 As shown, the outer diameter d81 of the outer circumferential surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12 is larger than the outer diameter d82 of the outer circumferential surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11, and is smaller than the outer diameter d83 of the outer circumferential surface of the portion of the cover 4 where the seal installation portion 10 is not formed. Typically, the portion of the cover 4 corresponding to the seal installation portion 10 is a cylindrical shape with a step, and has a large diameter portion 19 located on the outside of the axial direction J1 and a small diameter portion 20 located on the inside of the axial direction J1. The outer circumferential surface of the large diameter portion 19 is the outer circumferential surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12. The outer circumferential surface of the small diameter portion 20 is the outer circumferential surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11.

[0055] In the case of the stator 1f of the fourth embodiment, the seal 9 is pushed into the seal arrangement portion 11 from the opening of the gap 8 via the seal introduction portion 12. The seal 9 seals the opening of the gap 8 in a state where it is pushed into the seal arrangement portion 11. As described above, the outer diameter of the outer peripheral surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12 is larger than the outer diameter of the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal arrangement portion 11. Therefore, the stator 1f of the fourth embodiment is a structure in which the seal 9 is difficult to be separated from the seal mounting portion 10.

[0056] The seal mounting portion of the other cover is basically the same structure as the seal mounting portion 10 of the first cover 4. However, in the case of the seal mounting portion of the other cover, the outer side in the axial direction J1 is the other side in the axial direction J1, and the inner side in the axial direction J1 is one side in the axial direction J1.

[0057] Next, use Fig. 9A modified example of the stator of the fourth embodiment will be described. In addition, since the components having the same reference numerals as those of the first embodiment and the fourth embodiment have the same functions, their descriptions are sometimes omitted below. The stator 1g of this modified example is different from that of the fourth embodiment in the structure of the seal mounting portion 10. Here, one of the cover portions 4 and the other cover portion 4 is described.

[0058] like Fig. 9 As shown, the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11 is continuous with the outer peripheral surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12. The outer diameter of the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11 decreases as it goes to the inner side of the axial direction J1 which is the other side of the axial direction J1 of the cover 4 from the portion connected to the outer peripheral surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12. Specifically, the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11 is tapered in a manner that the diameter decreases as it goes to the inner side of the axial direction J1 of the cover 4. In this way, the outer diameter d91 of the outer peripheral surface 14 of the portion of the cover 4 corresponding to the seal introduction portion 12 is larger than the smallest portion d92 of the outer diameter of the outer peripheral surface 13 of the portion of the cover 4 corresponding to the seal configuration portion 11. An outer diameter d91 of the outer peripheral surface 14 of the portion of the cover portion 4 corresponding to the seal introduction portion 12 is smaller than an outer diameter d93 of the outer peripheral surface of the portion of the cover portion 4 where the seal mounting portion 10 is not formed.

[0059] In the case of the stator 1g of this modified example, the seal 9 is pushed into the seal arrangement portion 11 from the opening of the gap 8 via the seal introduction portion 12. In addition, the seal mounting portion of the other cover portion is basically the same structure as the seal mounting portion 10 of the one cover portion 4. However, in the case of the seal mounting portion of the other cover portion, the outer side in the axial direction J1 is the other side of the axial direction J1, and the inner side in the axial direction J1 is one side of the axial direction J1.

[0060] In addition, the present invention is not limited to the aforementioned embodiments and the aforementioned variations, and variations and improvements within the scope of achieving the purpose of the present invention are included in the present invention. For example, in the seal mounting portion 10 of one cover portion 4 and the seal mounting portion 10' of another cover portion 4', the aforementioned embodiments and the aforementioned variations can be appropriately combined.

[0061] Description of Reference Numerals

[0062] 1. stator; 2. stator core; 3. coil; 4. covering part; 5. coil end; 6. annular member; 8. gap; 9. seal; 10. seal installation part; 11. seal configuration part; 12. seal introduction part.

Claims

1. A stator, which is inserted into a circular ring member, wherein: The stator has: A cylindrical stator core; a coil provided on the stator core and having a coil end portion protruding axially outward from an axial end surface of the stator core; and a cylindrical covering portion which is provided so as to cover the coil end and protrudes axially outward from the axial end surface of the stator core portion, The covering portion has a seal mounting portion, on which a seal is mounted, and the seal seals the gap between the annular member and the covering portion. The seal mounting portion is in the shape of an annular groove that is recessed radially inward on the outer peripheral surface of the cover portion, and extends to an axially outer end of the cover portion to be open.

2. The stator according to claim 1, wherein: The seal installation portion comprises: a seal member placement portion located axially inward of the cover portion and capable of placing the seal member; and a seal introduction portion, which is located axially outside the cover portion and has an open end portion of the seal installation portion, and introduces the seal from the open end portion of the seal installation portion into the seal configuration portion, The outer diameter of the outer peripheral surface of the portion of the covering portion corresponding to the seal placement portion increases from a portion connected to the outer peripheral surface of the portion of the covering portion corresponding to the seal introduction portion toward the axial inner side of the covering portion.

3. The stator according to claim 1, wherein: An outer diameter of an outer peripheral surface of a portion of the covering portion corresponding to the seal mounting portion increases from an axially outer end portion of the covering portion toward an axially inner end portion of the covering portion.

4. The stator according to claim 1, wherein: The seal installation portion comprises: a seal member placement portion located axially inward of the cover portion and capable of placing the seal member; and a seal introduction portion, which is located axially outside the cover portion and has an open end portion of the seal installation portion, and introduces the seal from the open end portion of the seal installation portion into the seal configuration portion, An outer diameter of an outer peripheral surface of a portion of the covering portion corresponding to the seal introduction portion is larger than an outer diameter of an outer peripheral surface of a portion of the covering portion corresponding to the seal placement portion.

5. The stator according to claim 4, wherein: The outer diameter of the outer peripheral surface of the portion of the covering portion corresponding to the seal placement portion decreases toward the axial inner side of the covering portion from a portion connected to the outer peripheral surface of the portion of the covering portion corresponding to the seal introduction portion.

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