JP5300125B2 - motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which suppresses the occurrence of friction due to oil viscosity by suppressing the infiltration of lubricant into space between a rotor and a stator. <P>SOLUTION: The rotor stay 25 of the motor 10 is composed of a rotor core side stay 27, which holds a rotor core 24, a rotor shaft side stay 26, which is coupled with a rotor shaft 11, and a middle stay 28, which couples the rotor core side stay 27 with the rotor shaft side stay 26. The rotor core side stay 27 is equipped with an extension 27a, which extends outside more than the axial end 45b of an insulator 45. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a motor, and more particularly to a motor used in oil lubrication.

As a motor used for oil lubrication, a motor described in Patent Document 1 is known. As shown in FIG. 8, in the motor 100 described in Patent Document 1, the coolant is supplied from the oil passage 102 provided in the rotor shaft 101 to the coil terminal portion 105 of the stator 104 through the gap of the bearing 103. Thus, a technique for cooling the coil terminal unit 105 is disclosed.
JP 2003-9467 A

  However, in the motor 100 described in Patent Document 1, the lubricating oil supplied to the coil terminal portion 105 accumulates and enters the gap 107 (air gap) between the rotor 106 and the stator 104, and the entered lubricating oil is the oil. Viscosity caused rotor friction during rotor rotation.

  The present invention has been made in view of the above problems, and provides a motor that suppresses the intrusion of lubricating oil into a gap (air gap) between a rotor and a stator and suppresses the generation of friction due to oil viscosity. Objective.

In order to achieve the above object, the motor according to the first aspect of the present invention (for example, the motor 10 of the embodiment described later)
A rotor (for example, a rotor 12 of the embodiment described later) including a rotor core (for example, a rotor core 24 of the embodiment described later) and a rotor stay (for example, a rotor stay 25 of the embodiment described later);
A rotor shaft connected to the rotor stay (for example, a rotor shaft 11 in an embodiment described later);
The rotor core is disposed to face the rotor core with a predetermined gap, and a laminated steel plate (for example, a laminated steel plate 44 in an embodiment described later) is insulated by an insulator (for example, an insulator 45 in an embodiment described later) and a coil (for example, described later). A stator (for example, a stator 14 in an embodiment described later) formed by winding a coil 47) of the embodiment;
A motor housing for housing the rotor and the stator (for example, a motor housing 15 in an embodiment described later);
A bearing that rotatably supports the rotor shaft on the motor housing (for example, a bearing 22 in an embodiment described later);
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing (for example, an oil passage 11a in an embodiment described later);
A motor equipped with
The rotor stay includes a rotor core side stay (for example, a rotor core side stay 27 in an embodiment described later) that holds the rotor core, and a rotor shaft side stay (for example, a rotor shaft side in an embodiment described later) connected to the rotor shaft. A stay 26) and an intermediate stay (for example, an intermediate stay 28 in an embodiment described later) for connecting the rotor core side stay and the rotor shaft side stay,
The rotor core side stay is an extended portion (for example, an extended portion 27a of an embodiment described later) that extends outward from an axial end portion (for example, an axial end portion 45b of the embodiment described later) of the insulator. It is characterized by providing.

Further, the motor according to the second aspect of the invention (for example, a motor 10A in an embodiment described later)
A rotor (for example, a rotor 12 of the embodiment described later) including a rotor core (for example, a rotor core 24 of the embodiment described later) and a rotor stay (for example, a rotor stay 25 of the embodiment described later);
A rotor shaft connected to the rotor stay (for example, a rotor shaft 11 in an embodiment described later);
The rotor core is disposed to face the rotor core with a predetermined gap, and a laminated steel plate (for example, a laminated steel plate 44 in an embodiment described later) is insulated by an insulator (for example, an insulator 45 in an embodiment described later) and a coil (for example, described later). A stator (for example, a stator 14 in an embodiment described later) formed by winding a coil 47) of the embodiment;
A motor housing for housing the rotor and the stator (for example, a motor housing 15 in an embodiment described later);
A bearing that rotatably supports the rotor shaft on the motor housing (for example, a bearing 22 in an embodiment described later);
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing (for example, an oil passage 11a in an embodiment described later);
A motor equipped with
Between the inner peripheral surface and the outer peripheral surface of the insulator , a storage portion that stores the coil end of the coil (for example, a storage portion 46 of an embodiment described later) is formed.
Wherein said inner circumferential surface of the insulator in the axial position accommodating portion is formed (e.g., the inner peripheral surface 45a of the embodiment described later '), characterized in that the diameter increases gradually toward outside in the axial direction.

Further, the motor according to the third aspect of the invention (for example, the motor 10B of the embodiment described later)
A rotor (for example, a rotor 12 of the embodiment described later) including a rotor core (for example, a rotor core 24 of the embodiment described later) and a rotor stay (for example, a rotor stay 25 of the embodiment described later);
A rotor shaft connected to the rotor stay (for example, a rotor shaft 11 in an embodiment described later);
The rotor core is disposed to face the rotor core with a predetermined gap, and a laminated steel plate (for example, a laminated steel plate 44 in an embodiment described later) is insulated by an insulator (for example, an insulator 45 in an embodiment described later) and a coil (for example, described later). A stator (for example, a stator 14 in an embodiment described later) formed by winding a coil 47) of the embodiment;
A motor housing for housing the rotor and the stator (for example, a motor housing 15 in an embodiment described later);
A bearing that rotatably supports the rotor shaft on the motor housing (for example, a bearing 22 in an embodiment described later);
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing (for example, an oil passage 11a in an embodiment described later);
A motor equipped with
The rotor stay includes a rotor core side stay (for example, a rotor core side stay 27 in an embodiment described later) that holds the rotor core, and a rotor shaft side stay (for example, a rotor shaft side in an embodiment described later) connected to the rotor shaft. A stay 26) and an intermediate stay (for example, an intermediate stay 28 in an embodiment described later) for connecting the rotor core side stay and the rotor shaft side stay,
Between the inner peripheral surface and the outer peripheral surface of the insulator , a storage portion that stores the coil end of the coil (for example, a storage portion 46 of an embodiment described later) is formed.
The inner peripheral surface of the insulator in the axial direction position where the receiving portion is formed (e.g., the inner peripheral surface 45a of the embodiment), the protrusion protruding in a radial direction so as to cover the gap as viewed in the axial direction the provided (e.g., the projecting portion 62 of the embodiment),
The protrusion is characterized that you located inside the axial end portion of the rotor core side stay.

Further, the motor according to the invention described in claim 4 (for example, a motor 10C according to an embodiment described later)
A rotor (for example, a rotor 12 of the embodiment described later) including a rotor core (for example, a rotor core 24 of the embodiment described later) and a rotor stay (for example, a rotor stay 25 of the embodiment described later);
A rotor shaft connected to the rotor stay (for example, a rotor shaft 11 in an embodiment described later);
The rotor core is disposed to face the rotor core with a predetermined gap, and a laminated steel plate (for example, a laminated steel plate 44 in an embodiment described later) is insulated by an insulator (for example, an insulator 45 in an embodiment described later) and a coil (for example, described later). A stator (for example, a stator 14 in an embodiment described later) formed by winding a coil 47) of the embodiment;
A motor housing for housing the rotor and the stator (for example, a motor housing 15 in an embodiment described later);
A bearing that rotatably supports the rotor shaft on the motor housing (for example, a bearing 22 in an embodiment described later);
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing (for example, an oil passage 11a in an embodiment described later);
A motor equipped with
A concave portion (for example, a concave portion 45d in an embodiment described later) is provided on a contact surface (for example, an accommodating portion 46 in an embodiment described later) of the insulator in the insulator in an axial contact surface with the laminated steel plate. Provided,
A discharge passage (for example, an embodiment described later) that penetrates from an inner peripheral surface of the insulator (for example, an inner peripheral surface 45a of an embodiment described later) to an outer peripheral surface (for example, an outer peripheral surface 45c of an embodiment described later) by the recess. The discharge passage 70) is formed.

The motor according to claim 5 is the motor according to claim 1,
The rotor core includes a permanent magnet (for example, a permanent magnet 23 of an embodiment described later) inside a laminated steel plate (for example, a laminated steel plate 24a of embodiment described later),
The rotor core includes first and second end plates (for example, an end plate 29 in an embodiment described later) at both ends,
The oil passage communicates the rotor stay in a radial direction, a boundary portion between the laminated steel plate and the rotor core side stay (for example, a boundary portion 82 in an embodiment described later), and one axial direction side of the laminated steel plate. A boundary portion between an end face and the first end plate (for example, a boundary portion 83 in an embodiment described later), and a boundary portion between the permanent magnet and the laminated steel sheet (for example, a boundary portion 84 in an embodiment described later) An opening on the other axial side of the stay on the rotor core side via a boundary part (for example, a boundary part 85 of an embodiment described later) between the other end face in the axial direction of the laminated steel sheet and the second end plate. A branch oil passage (for example, a branch oil passage 11c in an embodiment described later) communicating with a portion (for example, an opening 27e in the embodiment described later) is provided.

The motor according to claim 6 is the motor according to claim 5,
The oil passage at the boundary between the one end face in the axial direction of the laminated steel plate and the first end plate is a recess formed in the first end plate,
The oil passage at the boundary between the other end face in the axial direction of the laminated steel sheet and the second end plate is a recess formed in the second end plate.

Moreover, the motor of the invention according to claim 7 is the motor according to any one of claims 2 to 4,
The rotor core includes a permanent magnet (for example, a permanent magnet 23 of an embodiment described later) inside a laminated steel plate (for example, a laminated steel plate 24a of embodiment described later),
The rotor core includes first and second end plates (for example, an end plate 29 in an embodiment described later) at both ends,
The rotor stay includes a rotor core side stay (for example, a rotor core side stay 27 in an embodiment described later) that holds the rotor core, and a rotor shaft side stay (for example, a rotor shaft side in an embodiment described later) connected to the rotor shaft. A stay 26) and an intermediate stay (for example, an intermediate stay 28 in an embodiment described later) for connecting the rotor core side stay and the rotor shaft side stay,
The oil passage communicates the rotor stay in a radial direction, a boundary portion between the laminated steel plate and the rotor core side stay (for example, a boundary portion 82 in an embodiment described later), and one axial direction side of the laminated steel plate. A boundary portion between an end face and the first end plate (for example, a boundary portion 83 in an embodiment described later), and a boundary portion between the permanent magnet and the laminated steel sheet (for example, a boundary portion 84 in an embodiment described later) An opening on the other axial side of the stay on the rotor core side via a boundary part (for example, a boundary part 85 of an embodiment described later) between the other end face in the axial direction of the laminated steel sheet and the second end plate. A branch oil passage (for example, a branch oil passage 11c in an embodiment described later) communicating with the portion is provided.

The motor according to claim 8 is the motor according to claim 7,
The oil passage at the boundary between the one end face in the axial direction of the laminated steel plate and the first end plate is a recess formed in the first end plate,
The oil passage at the boundary between the other end face in the axial direction of the laminated steel sheet and the second end plate is a recess formed in the second end plate.

  According to the motor of the first aspect of the present invention, since the extending portion of the rotor core side stay extends outward from the axial end portion of the insulator, the lubricating oil flowing out from the bearing toward the rotor side is on the rotor core side. The stay is guided outward from the axial end of the insulator by the extending portion of the stay. Therefore, it is possible to prevent the lubricating oil from entering the gap (air gap) between the rotor and the stator.

According to the motor of the invention described in claim 2, the inner circumferential surface of the Inshure motor in axial position accommodating portion is formed, so gradually enlarged toward axially outward, the inner peripheral surface of the insulator The scattered lubricating oil is guided toward the outside in the axial direction of the insulator . Therefore, it is possible to prevent the lubricating oil from entering the gap (air gap) between the rotor and the stator.

According to the motor of the invention described in claim 3, the inner peripheral surface of the Inshure motor in axial position accommodating portion is formed, projecting radially so as to cover the gap (air gap) as viewed in the axial direction It includes a projecting portion, the projecting portion can be prevented from Runode be located inside the axial end portion of the rotor core side stay, lubricating oil into the gap between the rotor and the stator (air gap) by protrusions intruding .

  Furthermore, according to the motor of the invention described in claim 4, the concave portion is provided on the contact surface on the axial direction side with the laminated steel plate of the housing portion for housing the coil end of the coil in the insulator, and the concave portion allows the inner circumferential surface of the insulator to be provided. Since the discharge passage penetrating to the outer peripheral surface is formed, the lubricating oil scattered on the inner peripheral surface of the housing portion is discharged to the outer peripheral surface of the insulator through the discharge passage. Therefore, it is possible to prevent the lubricating oil from entering the gap (air gap) between the rotor and the stator.

  Furthermore, according to the motor of the invention described in claims 5 and 7, the oil passage communicates the rotor stay in the radial direction, the boundary between the laminated steel plate and the rotor core side stay, and one axial side of the laminated steel plate. The rotor core side via the boundary between the end face and the first end plate, the boundary between the permanent magnet and the laminated steel sheet, and the boundary between the other end face in the axial direction of the laminated steel sheet and the second end plate Since the branch oil passage communicating with the opening on the other side in the axial direction of the stay is provided, the lubricant after cooling the gap between the rotor and the stator (air) while cooling the permanent magnet provided inside the rotor core with the lubricant. Intrusion into the gap) can be prevented.

  Furthermore, according to the motor of the invention described in claims 6 and 8, by forming an oil passage in the end plate, there is no need to perform special processing such as forming holes or notches in the laminated steel plate, Productivity can be improved while maintaining the function of the laminated steel sheet.

Hereinafter, embodiments of a motor according to the present invention will be described in detail with reference to the drawings.
<First Embodiment>
FIG. 1 is a sectional view of a motor according to a first embodiment of the present invention.
The motor 10 includes a rotor shaft 11 extending in the left-right direction in the drawing, a rotor 12 fitted and fixed to the outer periphery of the rotor shaft 11, and a predetermined gap in the radial direction (hereinafter referred to as an air gap 13). The rotor 12 and the stator 14 are accommodated in a motor housing 15.

  The motor housing 15 is fastened to the housing body 16 by a plurality of fastening bolts 50 so as to cover the rotor 12 and the stator 14 from one side in the axial direction (right side in the figure) and cover the outer periphery of the stator 14 from the outside in the radial direction. The housing lid 17 covers the rotor 12 and the stator 14 from the other axial side (left side in the figure). A stator 14 is supported on the housing body 16 by a plurality of fastening bolts 51.

  The stator 14 includes a laminated steel plate 44 and an insulator 45 that sandwiches the laminated steel plate 44 from both ends. As shown in FIG. 2, the insulator 45 has a coil 47 wound around a container portion 46 having a U-shaped cross section. The coil 47 is insulated from the laminated steel plate 44 by the insulator 45.

  The rotor shaft 11 includes a bearing 21 fixed to a cylindrical holding portion 16 b that protrudes in the axial direction from a side wall 16 a of the housing body 16 that constitutes the motor housing 15, and an inner diameter side circle of the housing lid body 17 that constitutes the motor housing 15. A bearing 22 fixed to the ring portion 17a is rotatably supported. The rotor shaft 11 is formed with an oil passage 11a through which the lubricating oil passes, and is sealed in the inner ring-side annular portion 17a through an opening 11b located on the other axial side of the bearing 22. An opening is formed in a space formed by the stop plate 18.

  A resolver 30 that detects the rotational position of the rotor 12 is provided on the radially outer side of the bearing 21.

  The rotor 12 includes an annular rotor core 24 in which a plurality of electromagnetic steel plates are laminated, and a rotor stay 25 that is fixed to the rotor shaft 11 and holds the rotor core 24. The rotor core 24 is embedded in the laminated steel plate 24a and magnetized in the radial direction. The permanent magnet 23 is sandwiched by end plates 29 (end plates) from both ends in the axial direction.

  The rotor stay 25 has a rotor shaft side stay 26 extending on both sides in the axial direction on the inner diameter side and the outer diameter side, a rotor core side stay 27, and a substantially central portion of the rotor shaft side stay 26 and the rotor core side stay 27. The intermediate stay 28 is connected in the direction. The rotor shaft side stay 26 is fitted and fixed to the outer periphery of the rotor shaft 11, and the rotor core side stay 27 is fitted and fixed to the inner periphery of the rotor core 24, so that the rotor shaft 11 and the rotor 12 can rotate together. Yes.

  As shown in FIG. 2, the rotor core-side stay 27 has an extending portion 27a facing the inner peripheral surface 45a of the accommodating portion 46 of the insulator 45 on the other axial side (left side in the drawing). The axial end portion 27 b is located outside the axial end portion 45 b of the insulator 45. Further, the inner peripheral surface 27c of the rotor core side stay 27 is an inclined surface that increases in diameter from the connecting portion with the intermediate stay 26 toward the outer side in the axial direction.

  The intermediate stay 28 is formed with a rotor stay extending portion 40 extending from the substantially central portion in the radial direction to one side in the axial direction over the entire circumference of the rotor shaft 11. 21 is opposed to the outer peripheral surface of the outer ring, that is, the outer peripheral surface of the outer ring via the cylindrical holding portion 16b. As shown in FIG. 1, a resolver rotor 31 that detects the rotational position of the rotor 12 is provided on the outer peripheral surface of the tip portion of the rotor stay extending portion 40, and the resolver rotor 31 is opposed to the resolver rotor 31. A resolver stator 32 is fixed to the side wall 16 a of the housing body 16 by a resolver stator support member 35 on the outer diameter side of the housing.

  Therefore, when the rotor 12 rotates, the rotor shaft 11 rotates, or when the rotor shaft 11 rotates, the rotor 12 rotates, and the resolver rotor 31 provided at the tip of the rotor stay extension 40 rotates. Thus, the rotational position of the rotor 12 can be detected.

  In the motor 10 configured in this manner, as shown by the arrow in FIG. 2, the lubricating oil supplied through the oil passage 11 a formed in the rotor shaft 11 is the opening 11 b on the other axial side of the bearing 22. Is supplied to the bearing 22 and supplied into the motor 10 through the bearing space. The lubricating oil discharged from one axial side of the bearing 22 (the rotor 12 side) is scattered on the inner peripheral surface 27c of the rotor core side stay 27 located on the outer diameter side by the rotation of the rotor shaft 11, and the lubricating oil is The rotor core side stay 27 is guided outward by the inclination of the inner peripheral surface 27c. Due to the rotation of the rotor 12, the lubricating oil scattered from the rotor core stay 27 moves downward in the gravity direction along the side wall 17 b of the housing lid body 17, and is once collected in an oil reservoir (not shown) and lubricated again.

  According to the motor 10 configured as described above, the axial end portion 27b of the extending portion 27a of the rotor core stay 27 extends outward from the axial end portion 45b of the insulator 45. Lubricating oil that has flowed out to the rotor 12 side is guided outside the axial end portion 45 b of the insulator 45 by the extending portion 27 a of the rotor core side stay 27. Thereby, it is possible to prevent the lubricating oil from entering the air gap 13 between the rotor 12 and the stator 14.

  Further, the inner circumferential surface 27c of the rotor core side stay 27 is inclined as it extends to the outside (bearing 22 side), so that the lubricating oil can be more reliably guided to the outside by utilizing the centrifugal force of the rotor 12. it can.

  Furthermore, it is not necessary to provide a new stay by using the rotor core side stay 27 as a guide for the lubricating oil.

Second Embodiment
FIG. 3 is a cross-sectional view of a motor according to a second embodiment of the present invention. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the motor 10 </ b> A of the present embodiment, the inner peripheral surface 45 a ′ of the housing portion 46 of the insulator 45 that faces the rotor 12 is an inclined surface that gradually increases in diameter toward the outer side in the axial direction.

  According to the motor 10 </ b> A configured as described above, the lubricating oil flowing out from the bearing 22 toward the rotor 12 is guided to the outside by the rotor core side stay 27, and the lubricating oil scattered by the centrifugal force due to the rotation of the rotor 12 is further added to the insulator 45. Are scattered on the inner peripheral surface 45 a ′ of the housing portion 46 and the side wall 17 b of the housing lid body 17. The lubricating oil scattered on the inner peripheral surface 45a ′ of the accommodating portion 46 of the insulator 45 is guided to the outside along the inclination of the inner peripheral surface 45a ′, and is collected together with the lubricating oil that has flowed downward in the gravity direction along the side wall 17b. The Thereby, it is possible to prevent the lubricating oil from entering the air gap 13 between the rotor 12 and the stator 14.

  In this embodiment, the axial end portion 27b of the rotor core side stay 27A is located inside the axial end portion 45b of the insulator 45, but extends like the rotor core side stay 27 in the first embodiment. A synergistic effect can be obtained by providing the portion 27a.

<Third Embodiment>
FIG. 4 is a sectional view of a motor according to a third embodiment of the present invention. In the figure, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the motor 10 </ b> B of the present embodiment, a projecting portion 62 projecting in the radial direction is provided on the inner peripheral surface 45 a of the housing portion 46 of the insulator 45 facing the rotor 12 so as to cover the air gap 13 in the axial direction.

  More specifically, a shielding member 60 is provided on the inner peripheral surface 45 a of the housing portion 46 of the insulator 45, and the shielding member 60 is fitted into the inner peripheral surface 45 a of the housing portion 46 of the insulator 45. Then, a projecting portion 62 projecting radially inward from the approximate center of the cylindrical portion 61 is formed, and the tip of the projecting portion 62 is configured to be positioned on the inner diameter side from the air gap 13. Further, the projecting portion 62 is configured to be positioned on the inner side of the axial end portion 27b of the rotor core side stay 27B.

  According to the motor 10B configured as described above, the lubricating oil flowing out from the bearing 22 to the rotor 12 side is guided to the outside by the rotor core side stay 27B, and the lubricating oil scattered by the centrifugal force due to the rotation of the rotor 12 62 prevents the lubricating oil from entering the air gap 13 between the rotor 12 and the stator 14.

  In addition, you may provide the extension part 27a like the rotor core side stay 27 in 1st Embodiment, and also the inner peripheral surface 45a of the accommodating part 46 of the insulator 45 of 2nd Embodiment gradually goes to an axial direction outer side. It is good also as an inclined surface which expands in diameter.

<Fourth embodiment>
FIG. 5 is a sectional view of a motor according to a fourth embodiment of the present invention. In the figure, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the motor 10C of this embodiment, a discharge passage 70 penetrating from the inner peripheral surface 45a of the insulator 45 to the outer peripheral surface 45c is formed.

  More specifically, as shown in FIG. 6, which is a cross-sectional view taken along the line AA in FIG. 5, a recess 45 d extending in the radial direction is formed on the contact surface on the axial direction side of the housing portion 46 of the insulator 45 with the laminated steel plate 44. The discharge passage 70 penetrating from the inner peripheral surface 45a of the insulator 45 to the outer peripheral surface 45c is formed by the recess 45d.

  According to the motor 10 </ b> C configured as described above, the lubricating oil that has flowed out from the bearing 22 toward the rotor 12 side is scattered along the discharge passage 70 even when the lubricating oil is scattered from the rotor core side stay 27 </ b> A to the inner peripheral surface 45 a of the insulator 45. Thus, the lubricating oil flows out from the inner peripheral surface 45a of the insulator 45 to the outer peripheral surface 45c, so that the lubricating oil is prevented from entering the air gap 13 between the rotor 12 and the stator 14. In addition, you may combine the structure of this embodiment and 1st-3rd embodiment.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, FIG. 7 shows a modification of the motor in the first embodiment of the present invention.

In the motor 10D of this modification, an oil passage 11a formed in the rotor shaft 11 includes a branch oil passage 11c.
The branch oil passage 11c includes a radial oil passage 81 that communicates the rotor stay 25 in the radial direction, a boundary portion 82 between the laminated steel plate 24a and the rotor core side stay 27, one axial end surface of the laminated steel plate 24a, and an end plate. The rotor core stay 27 via the boundary 83 between the permanent magnet 23 and the laminated steel plate 24a, and the boundary 85 between the other end surface in the axial direction of the laminated steel plate 24a and the end plate 29. It communicates with the opening 27e on the other axial side.

  In each of the boundary portions 82, 83, 84, 85, the laminated steel plate 24 a may be cut out to form an oil passage. However, in the boundary portions 82, 84, the laminated steel plate 24 a, the rotor core side stay 27, and the permanent magnet. If the oil passage is formed by the notch formed in the end plate 29 at the boundary portions 83 and 85 due to the radial clearance with the permanent magnet 23, the permanent magnet 23 can be cooled with the lubricating oil while maintaining the output of the motor 10D. . In addition, you may combine this modification with the structure of 2nd-4th embodiment.

  In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

1 is a cross-sectional view of a motor according to a first embodiment of the present invention. It is a principal part enlarged view of the motor of FIG. It is principal part sectional drawing of the motor which concerns on 2nd Embodiment of this invention. It is principal part sectional drawing of the motor which concerns on 3rd Embodiment of this invention. It is principal part sectional drawing of the motor which concerns on 4th Embodiment of this invention. It is the sectional view on the AA line of FIG. It is principal part sectional drawing of the motor which concerns on the modification of this invention. 2 is a cross-sectional view of a main part of a motor described in Patent Document 1. FIG.

Explanation of symbols

10, 10A, 10B, 10C, 10D Motor 11 Rotor shaft 11a Oil passage 11b Branch oil passage 12 Rotor 13 Air gap (gap)
14 Stator 15 Motor housing 21, 22 Bearing 23 Permanent magnet 24 Rotor core 24a Laminated steel plate 25 Rotor stay 26 Rotor shaft side stay 27, 27A, 27B Rotor core side stay 27a Extending portion 27b Axial end portion 28 Intermediate stay 29 End plate (end) Board)
44 Laminated steel plate 45 Insulator 45a, 45a 'Inner peripheral surface 45b Axial end 45c of outer insulator Outer peripheral surface 45d Recess 46 Housing 47 47 Coil 62 Protrusion 70 Discharge passage

Claims (8)

A rotor composed of a rotor core and a rotor stay;
A rotor shaft connected to the rotor stay;
A stator that is disposed opposite to the rotor core via a predetermined gap, and in which laminated steel plates are insulated by an insulator and wound with a coil;
A motor housing that houses the rotor and the stator;
A bearing rotatably supporting the rotor shaft on the motor housing;
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing;
A motor equipped with
The rotor stay includes a rotor core side stay that holds the rotor core, a rotor shaft side stay connected to the rotor shaft, and an intermediate stay that connects the rotor core side stay and the rotor shaft side stay,
The rotor core-side stay includes an extending portion that extends outward from an axial end portion of the insulator. A rotor composed of a rotor core and a rotor stay;
A rotor shaft connected to the rotor stay;
A stator that is disposed opposite to the rotor core via a predetermined gap, and in which laminated steel plates are insulated by an insulator and wound with a coil;
A motor housing that houses the rotor and the stator;
A bearing rotatably supporting the rotor shaft on the motor housing;
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing;
A motor equipped with
Between the inner peripheral surface and the outer peripheral surface of the insulator , an accommodating portion for accommodating the coil end of the coil is formed,
The motor, wherein the inner peripheral surface of the insulator at an axial position where the housing portion is formed gradually increases in diameter toward the outer side in the axial direction. A rotor composed of a rotor core and a rotor stay;
A rotor shaft connected to the rotor stay;
A stator that is disposed opposite to the rotor core via a predetermined gap, and in which laminated steel plates are insulated by an insulator and wound with a coil;
A motor housing that houses the rotor and the stator;
A bearing rotatably supporting the rotor shaft on the motor housing;
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing;
A motor equipped with
The rotor stay includes a rotor core side stay that holds the rotor core, a rotor shaft side stay connected to the rotor shaft, and an intermediate stay that connects the rotor core side stay and the rotor shaft side stay,
Between the inner peripheral surface and the outer peripheral surface of the insulator , an accommodating portion for accommodating the coil end of the coil is formed,
On the inner circumferential surface of the insulator in the axial direction position where the accommodating portion is formed, a projection projecting radially so as to cover the gap as viewed in the axial direction is provided,
Motor wherein the protrusions characterized that you located inside the axial end portion of the rotor core side stay. A rotor composed of a rotor core and a rotor stay;
A rotor shaft connected to the rotor stay;
A stator that is disposed opposite to the rotor core via a predetermined gap, and in which laminated steel plates are insulated by an insulator and wound with a coil;
A motor housing that houses the rotor and the stator;
A bearing rotatably supporting the rotor shaft on the motor housing;
An oil passage provided in the rotor shaft and opening on the opposite side of the rotor to the bearing;
A motor equipped with
A recess is provided on the contact surface on the axial direction side of the laminated steel sheet of the housing portion that houses the coil end of the coil in the insulator,
A motor characterized in that a discharge passage penetrating from an inner peripheral surface of the insulator to an outer peripheral surface is formed by the recess. The rotor core includes a permanent magnet inside the laminated steel plate,
The rotor core includes first and second end plates at both ends,
The oil passage communicates the rotor stay in a radial direction, a boundary portion between the laminated steel plate and the rotor core side stay, a boundary portion between one axial end surface of the laminated steel plate and the first end plate. And the other axial end side of the stay on the rotor core side via the boundary portion between the permanent magnet and the laminated steel plate, and the boundary portion between the other end face in the axial direction of the laminated steel plate and the second end plate. The motor according to claim 1, further comprising a branch oil passage that communicates with the opening portion. The oil passage at the boundary between the one end face in the axial direction of the laminated steel plate and the first end plate is a recess formed in the first end plate,
6. The oil passage at the boundary between the other end face in the axial direction of the laminated steel sheet and the second end plate is a recess formed in the second end plate. motor. The rotor core includes a permanent magnet inside the laminated steel plate,
The rotor core includes first and second end plates at both ends,
The rotor stay includes a rotor core side stay that holds the rotor core, a rotor shaft side stay connected to the rotor shaft, and an intermediate stay that connects the rotor core side stay and the rotor shaft side stay,
The oil passage communicates the rotor stay in a radial direction, a boundary portion between the laminated steel plate and the rotor core side stay, a boundary portion between one axial end surface of the laminated steel plate and the first end plate. And the other axial end side of the stay on the rotor core side via the boundary portion between the permanent magnet and the laminated steel plate, and the boundary portion between the other end face in the axial direction of the laminated steel plate and the second end plate. The motor according to claim 2, further comprising a branch oil passage that communicates with the opening. The oil passage at the boundary between the one end face in the axial direction of the laminated steel plate and the first end plate is a recess formed in the first end plate,
8. The oil passage in the boundary portion between the other end face in the axial direction of the laminated steel plate and the second end plate is a recess formed in the second end plate. motor.

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