JP2016220506A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which prevents water from entering into the rotary electric machine.SOLUTION: An annular front seal member 20, which blocks water from entering from a portion where a front peripheral wall part 14b contacts with a stator core 13 into a space enclosed by a front frame end 14 and the stator core 13, is provided sandwiched between the front frame end 14 and the stator core 13. An annular rear seal member 21, which blocks water from entering from a portion where a rear peripheral wall part 15b contacts with the stator core 13 to a space enclosed by the rear frame end 15 and the stator core 13, is provided sandwiched between the rear frame end 15 and the stator core 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine that includes a frame end that rotatably supports one end side and the other end side of a rotating shaft, and a stator core that is provided between the frame ends.

  As this type of rotating electrical machine, as can be seen in Patent Document 1 below, a rotating electrical machine having a stator core provided on the outer peripheral side of a rotor in a state sandwiched between a front bracket and a rear bracket is known. Specifically, a control circuit unit that performs energization control of the rotating electrical machine is provided on the side opposite to the stator core side of the rear bracket. The control circuit unit is surrounded by a bottomed cylindrical cover.

JP 2014-107916 A

  Here, in the rotating electrical machine described in Patent Document 1, the stator core is provided such that a part of the outer peripheral surface thereof is not surrounded by the cover and is exposed to the outside. For this reason, when water is applied to the rotating electrical machine, there is a possibility that water may enter the rotating electrical machine from the gap between the portions where the bracket contacts the stator core.

  An object of the present invention is to provide a rotating electrical machine that can prevent water from entering the rotating electrical machine.

  Hereinafter, means for solving the above-described problems and the operation and effects thereof will be described.

  The present invention includes a rotor (12) attached to a rotating shaft (11), a first frame end (14) rotatably supporting one end of the rotating shaft, and the other end of the rotating shaft rotatable. And a stator core (13; 31; 41; 24) provided on the outer peripheral side of the rotor in a state sandwiched between the first frame end and the second frame end. The first frame end annularly contacts the outer edge of the stator core on the first frame end side in the central axis direction of the rotation shaft, and the second frame end is in the central axis direction. An annular contact with the outer edge of the stator core on the second frame end side, between the first frame end and the stator core, and between the second frame end and the stator Between the contact ends of the frame end and the stator core, which are provided in at least one of the gaps in the center axis direction, and prevent water from entering the space surrounded by the frame end and the stator core. And an annular seal member (20, 21; 37, 38; 45, 46; 22, 23; 25, 26).

  In the first aspect of the invention, the annular seal member that prevents water from entering the space surrounded by the frame end and the stator core from the contact portions of the frame end and the stator core facing each other in the central axis direction of the rotation shaft is the first seal member. It is provided at least one of between the frame end and the stator core and between the second frame end and the stator core. For this reason, even if there is a gap in the contact portion between the frame end and the stator core, water can be prevented from entering the space surrounded by the frame end and the stator core from this gap.

Sectional drawing of the motor concerning 1st Embodiment. Sectional drawing of the motor concerning 2nd Embodiment. Sectional drawing of the motor concerning 3rd Embodiment. Sectional drawing of the motor concerning the modification of 2nd Embodiment. Sectional drawing of the motor concerning the modification of 1st Embodiment. Sectional drawing of the motor concerning the modification of 1st Embodiment.

(First embodiment)
Hereinafter, an embodiment in which a rotating electrical machine according to the present invention is embodied will be described with reference to the drawings. A motor as a rotating electrical machine is used as a motor for in-vehicle electric power steering, for example. For example, the motor is disposed in the passenger compartment with the rotation axis extending in the vertical direction.

  As shown in FIG. 1, the motor 10 corresponds to a rotating shaft 11, a rotor 12, a stator core 13, a front frame end 14 (corresponding to “first frame end”), and a rear frame end 15 (corresponding to “second frame end”). ). The rotor 12 is fixed to the rotating shaft 11 and rotates integrally with the rotating shaft 11. In this embodiment, the rotor 12 has a permanent magnet 12a.

  The stator core 13 has a cylindrical shape and is provided between the front frame end 14 and the rear frame end 15. A rotor 12 is disposed on the inner peripheral side of the stator core 13. Teeth and slots are formed in the stator core 13, and a stator winding 13a is wound around it.

  The front frame end 14 is made of a conductive material and has a disc-shaped front main body portion 14a. The front main body portion 14a rotatably supports the front side of the rotary shaft 11 via a front bearing 16 fixed to the center through hole. Further, the front frame end 14 has an annular front peripheral wall portion 14 b that extends from the front main body portion 14 a in a direction intersecting with the front main body portion 14 a and whose front end portion abuts on the outer edge portion of the stator core 13. Specifically, the front end portion of the front peripheral wall portion 14 b is in contact with the outer edge portion of the end surface extending in the radial direction of the stator core 13 on the front frame end 14 side of the stator core 13. In the present embodiment, the outer diameter of the front peripheral wall portion 14 b is larger than the outer diameter of the stator core 13, and the inner diameter of the front peripheral wall portion 14 b is smaller than the outer diameter of the stator core 13. A space surrounded by the stator core 13 and the front frame end 14 is formed by the front peripheral wall portion 14b.

  Outer of the front peripheral wall portion 14b on the radially outer side than the portion in contact with the stator core 13, the tip portion extends toward the rear frame end 15 along the central axis X direction of the rotary shaft 11, and the inner peripheral surface is the outer periphery of the stator core 13. An annular front protrusion 14c formed along the surface is provided.

  The rear frame end 15 is formed of a conductive material, and is disposed on the opposite side of the rotor 12 from the front frame end 14 in the central axis X direction of the rotation shaft 11. The rear frame end 15 has a rear main body portion 15a. The rear main body portion 15a has a disk shape, and rotatably supports the rear side of the rotating shaft 11 via a rear bearing 17 fixed to the center through hole.

  The rear frame end 15 has an annular rear peripheral wall portion 15 b that extends toward the stator core 13 in the direction of the central axis X and has a front end portion that abuts against an outer edge portion of the stator core 13. Specifically, the distal end portion of the rear peripheral wall portion 15 b is in contact with the outer edge portion of the end surface extending in the radial direction of the stator core 13 on the rear frame end 15 side of the stator core 13. The outer diameter of the rear peripheral wall portion 15 b is larger than the outer diameter of the stator core 13, and the inner diameter of the rear peripheral wall portion 15 b is smaller than the outer diameter of the stator core 13. A space surrounded by the stator core 13 and the rear frame end 15 is formed by the rear peripheral wall portion 15b.

  In the rear peripheral wall portion 15 b, the tip end portion extends toward the front frame end 14 along the central axis X direction of the rotating shaft 11 and is radially outer than the portion in contact with the stator core 13, and the inner peripheral surface is the outer periphery of the stator core 13. An annular rear protrusion 15c formed along the surface is provided.

  In a state where the stator core 13 is sandwiched between the front frame end 14 and the rear frame end 15, a fastener 19 such as a through bolt is inserted into a bolt hole 18 formed in the front frame end 14 and the rear frame end 15. The end 14 and the rear frame end 15 are fixed by a fastener 19. Thereby, the stator core 13, the front frame end 14, and the rear frame end 15 are integrated.

  In the present embodiment, the motor 10 is mounted on the vehicle such that the direction of the central axis X of the rotary shaft 11 extends in the vertical direction. For example, the motor 10 is mounted on the vehicle with the central axis X direction being the direction of gravity.

  In the present embodiment, a control board (not shown) that controls energization of the stator winding 13 a is provided on the opposite side of the rear frame end 15 from the front frame end 14. Further, a bottomed cylindrical cover (not shown) surrounding the control board is attached to a part of the outer peripheral surface of the rear frame end 15. In the present embodiment, the motor 10 is mounted on the vehicle with the cover facing upward and the front frame end 14 facing downward. In the present embodiment, a part of the outer peripheral surface of the stator core 13 is exposed outside without being surrounded by the cover. For this reason, the front frame end 14, the rear frame end 15, and the cover serve as a motor case that prevents foreign matter and the like from entering the motor 10.

  An annular front groove portion 14d is formed in a portion of the front peripheral wall portion 14b that faces the stator core 13. The front groove portion 14d is a portion where the front peripheral wall portion 14b is recessed with respect to the end surface of the stator core 13 on the front frame end 14 side. An annular front seal member 20 is provided in the front groove portion 14d. In the present embodiment, the front seal member 20 is formed of an elastic member such as rubber, and specifically, an O-ring is used. The front seal member 20 is accommodated in the front groove portion 14d, and is provided in a compressed state sandwiched between the stator core 13 and the front peripheral wall portion 14b. Thus, the front seal member 20 is in close contact with the stator core 13 and the front peripheral wall portion 14b.

  An annular rear groove portion 15d is formed in a portion of the rear peripheral wall portion 15b facing the stator core 13. The rear groove portion 15 e is a portion in which the rear peripheral wall portion 15 b is recessed with respect to the end surface of the stator core 13 on the rear frame end 15 side. An annular rear seal member 21 is provided in the rear groove portion 15d. In the present embodiment, the rear seal member 21 is formed of an elastic member such as rubber like the front seal member 20, and more specifically, an O-ring is used. The rear seal member 21 is housed in the rear groove portion 15d and is provided in a compressed state sandwiched between the stator core 13 and the rear peripheral wall portion 15b. Accordingly, the rear seal member 21 is in close contact with the stator core 13 and the rear peripheral wall portion 15b.

  The effect of this embodiment explained in full detail above is demonstrated.

  A front seal member 20 is provided between the front peripheral wall portion 14 b and the stator core 13, and a rear seal member 21 is provided between the rear peripheral wall portion 15 b and the stator core 13. For this reason, even if there is a gap between the front peripheral wall portion 14 b and the stator core 13, it is possible to prevent water from entering the space surrounded by the front frame end 14 and the stator core 13 from this gap. Further, even when there is a gap between the rear peripheral wall portion 15 b and the stator core 13, it is possible to prevent water from entering the space surrounded by the rear frame end 15 and the stator core 13 from this gap. Thus, according to the present embodiment, no matter which direction the water is applied to the motor 10, the gap between the front peripheral wall portion 14 b and the stator core 13 and the gap between the rear peripheral wall portion 15 b and the stator core 13. Therefore, it is possible to prevent water from entering the motor 10.

  In particular, in the present embodiment, the motor 10 is mounted on the vehicle with the direction of the central axis X extending in the vertical direction. For this reason, water is likely to be applied to a contact portion between the front core end 14 and the stator core 13, which is disposed below the rear frame end 15 of the front frame end 14 and the rear frame end 15. For this reason, there is a high possibility that water will enter the motor 10 through the contact portion between the front frame end 14 and the stator core 13. Even in this case, according to the present embodiment, water can be prevented from entering.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment. In the present embodiment, as shown in FIG. 2, a laminated core configured by laminating a plurality of core sheets in the central axis X direction is used as the stator core 31. A part of the pressing surface of the sealing member that prevents water from entering is formed by the stator core 31 instead of the frame end. In FIG. 2, the same components as those described in the first embodiment are denoted by the same reference numerals for convenience. Moreover, in FIG. 2, the hatching of the cross section of the core sheet is omitted.

  As shown in FIG. 2, the motor 30 includes the rotating shaft 11, the rotor 12, the front frame end 14, the rear frame end 15, the front bearing 16, the rear bearing 17, and the fastener 19, as in the first embodiment. I have.

  The motor 30 includes a stator core 31. Each core sheet constituting the stator core 31 has an annular shape and a thin plate shape. Specifically, the core sheet is formed of a sheet-like magnetic material (for example, an electromagnetic steel plate). Each core sheet is formed with teeth and slots. In the present embodiment, the stator core 31 includes a front large diameter portion 32, a front small diameter portion 33, a rear large diameter portion 34, a rear small diameter portion 35, and an intermediate portion 36.

  The front large-diameter portion 32 is a core sheet that is provided away from the front frame end 14 toward the rear frame end 15, and is a core sheet near the front frame end 14 among the plurality of core sheets. In the present embodiment, the front large-diameter portion 32 is configured by one core sheet. However, the front large-diameter portion 32 may be configured by a laminated body of a plurality of core sheets without being limited to one.

  In the present embodiment, the front small-diameter portion 33 is configured by a laminated body of a plurality of core sheets. The front small-diameter portion 33 is composed of all core sheets on the front frame end 14 side of the front large-diameter portion 32 among the plurality of core sheets.

  The rear large diameter portion 34 is a core sheet that is provided away from the rear frame end 15 toward the front frame end 14, and is a core sheet closer to the rear frame end 15 among the plurality of core sheets. In the present embodiment, the rear large-diameter portion 34 is configured by one core sheet. However, the rear large-diameter portion 34 may be configured by a laminated body of a plurality of core sheets without being limited to one.

  In the present embodiment, the rear small-diameter portion 35 is configured by a laminated body of a plurality of core sheets. The rear small-diameter portion 35 is composed of all core sheets on the rear frame end 15 side of the rear large-diameter portion 34 among the plurality of core sheets. The intermediate portion 36 is configured by a laminate of a plurality of core sheets sandwiched between the front large diameter portion 32 and the rear large diameter portion 34. The inner diameters of the plurality of core sheets constituting the stator core 31 are the same.

  In the present embodiment, the core sheets constituting each of the front large-diameter portion 32 and the rear large-diameter portion 34 have the same shape so as to suppress an increase in the types of components. For this reason, the outer diameter of the front large diameter portion 32 and the outer diameter of the rear large diameter portion 34 are the same. Moreover, in this embodiment, the core sheet | seat which comprises each of the front small diameter part 33, the rear small diameter part 35, and the intermediate part 36 is made into the same shape in order to suppress the increase in the kind of components. For this reason, the outer diameters of the front small-diameter portion 33, the rear large-diameter portion 34, and the intermediate portion 36 are the same.

  The outer diameter of the front small-diameter portion 33 is larger than the inner diameter of the front peripheral wall portion 14b. As a result, the outer edge portion on the radially outer side of the front small-diameter portion 33 is in contact with the outer edge portion on the radially inner side of the front peripheral wall portion 14b tip. An annular front seal surface S1 extending in the radial direction of the stator core 31 is formed at the front end portion of the front peripheral wall portion 14b on the radially outer side of the stator core 31 with respect to the portion where the front peripheral wall portion 14b contacts the front small diameter portion 33. ing.

  The outer diameter of the front large diameter portion 32 is made larger than the outer diameter of the front small diameter portion 33. When the motor 30 is viewed from the central axis X direction, a portion of the front large-diameter portion 32 that protrudes from the front small-diameter portion 33 to the outside in the radial direction of the stator core 31 is a front extension portion 32a. The front extension portion 32a has an annular shape extending outward in the radial direction of the stator core 31 to a position facing the front seal surface S1 while being separated from the front seal surface S1. In the present embodiment, the outer diameter of the front large diameter portion 32 is made smaller than the outer diameter of the front peripheral wall portion 14b.

  The outer diameter of the rear small diameter portion 35 is set larger than the inner diameter of the rear peripheral wall portion 15b. As a result, the outer edge portion on the radially outer side of the rear small diameter portion 35 is in contact with the outer edge portion on the radially inner side of the distal end portion of the rear peripheral wall portion 15b. An annular rear seal surface S2 extending in the radial direction of the stator core 31 is formed at the distal end portion of the rear peripheral wall portion 15b on the radially outer side of the stator core 31 with respect to the portion where the rear peripheral wall portion 15b contacts the rear small diameter portion 35. Yes.

  The outer diameter of the rear large diameter portion 34 is made larger than the outer diameter of the rear small diameter portion 35. When the motor 30 is viewed from the direction of the central axis X, a portion of the rear large diameter portion 34 that protrudes from the rear small diameter portion 35 to the outside in the radial direction of the stator core 31 is a rear extension portion 34a. The rear extension portion 34a has an annular shape extending outward in the radial direction of the stator core 31 to a position facing the rear seal surface S2 while being separated from the rear seal surface S2. In the present embodiment, the outer diameter of the rear large diameter portion 34 is smaller than the outer diameter of the rear peripheral wall portion 15b.

  The front frame end 14 side of the front extension portion 32a and the front seal surface S1 are annular holding surfaces of the front seal member 37. In the present embodiment, as in the first embodiment, the front seal member 37 is formed of an elastic member such as rubber, and more specifically, an O-ring is used. The front seal member 37 is provided in a compressed state between the front seal surface S1 and the front extension portion 32a. Accordingly, the front seal member 37 is in close contact with the front extension portion 32a and the front seal surface S1. Therefore, it is possible to prevent water from entering the space surrounded by the front frame end 14 and the stator core 31 from the gap between the front small-diameter portion 33 and the front peripheral wall portion 14b.

  The rear frame end 15 side of the rear extension 34a and the rear seal surface S2 are annular pressing surfaces of the rear seal member 38. In the present embodiment, like the front seal member 37, the rear seal member 38 is formed of an elastic member such as rubber, and more specifically, an O-ring is used. The rear seal member 38 is provided in a compressed state between the rear seal surface S2 and the rear extension 34a. Thus, the rear seal member 38 is in close contact with the rear extension 34a and the rear seal surface S2. Therefore, it is possible to prevent water from entering the space surrounded by the rear frame end 15 and the stator core 31 from the gap between the rear small diameter portion 35 and the rear peripheral wall portion 15b.

  The effect of this embodiment explained in full detail above is demonstrated.

  The outer diameter of the front large diameter portion 32 is made larger than the outer diameter of the front small diameter portion 33. The front extended portion 32 a of the front large diameter portion 32 is used as a pressing surface of the front seal member 37. Further, the outer diameter of the rear large diameter portion 34 is made larger than the outer diameter of the rear small diameter portion 35. The rear extension 34 a of the rear large diameter portion 34 is used as a pressing surface for the rear seal member 38. For this reason, it is possible to reduce the structure such as a groove for providing the seal members 37 and 38 from the frame ends 14 and 15. Thereby, the waterproof structure of the motor 30 can be realized with a simple configuration.

(Third embodiment)
Hereinafter, the third embodiment will be described with reference to the drawings with a focus on differences from the second embodiment. In the present embodiment, as shown in FIG. 3, the configuration of the stator core 41 as a laminated core is changed from the configuration of the second embodiment. Accordingly, the portion of the stator core 41 that is used as the pressing surface of the seal member is changed. In FIG. 3, the same components as those described in the second embodiment are denoted by the same reference numerals for convenience.

  As shown in FIG. 3, the motor 40 includes the rotating shaft 11, the rotor 12, the front frame end 14, the rear frame end 15, the front bearing 16, the rear bearing 17, and the fastener 19 as in the second embodiment. I have.

  The motor 40 includes a stator core 41 composed of a plurality of core sheets. In the present embodiment, the stator core 41 includes a front extension core 42 (corresponding to “end core member”), a rear extension core 43 (corresponding to “end core member”), and an intermediate portion 44. The inner diameters of the plurality of core sheets constituting the stator core 41 are the same. In FIG. 3, the hatching of the cross section of the core sheet is omitted.

  In the present embodiment, the intermediate portion 44 is configured by a laminated body of a plurality of core sheets. The core sheet constituting the intermediate portion 44 has an annular shape and a thin plate shape as in the second embodiment, and has the same shape.

  The front extension core 42 includes a front base portion 42a, a front inner extension portion 42b, and a front outer extension portion 42c. The front base portion 42a has an annular shape and a thin plate shape, and the outer edge portion on the radially outer side is in contact with the front end portion of the front peripheral wall portion 14b. The front inner extended portion 42b is an annular or cylindrical portion whose front end extends from the outer edge portion on the rotor 12 side of the front base portion 42a toward the front frame end 14 along the central axis X direction. In the present embodiment, the entire inner peripheral surface of the front inner extension 42 b faces the rotor 12.

  The front inner extension 42 b is for increasing the cross-sectional area of the magnetic path between the stator core 41 and the rotor 12. For this reason, the front extension core 42 has a different shape from the core sheet constituting the intermediate portion 44. In the present embodiment, a front outer extended portion 42c is further provided on the front extended core 42 for increasing the cross-sectional area of the magnetic path. The front outer extension portion 42c is provided on the outer edge portion on the radially outer side of the front base portion 42a, and extends annularly outward in the radial direction of the stator core 41 to a position facing the front seal surface S1 while being separated from the front seal surface S1. It is a part of. Specifically, the front outer extended portion 42c includes a cylindrical portion extending from the outer edge portion on the radially outer side of the front base portion 42a toward the rear frame end 15 along the central axis X direction, and a rear frame of the cylindrical portion. And an annular portion extending radially outward from the end 15 side.

  Similar to the front extension core 42, the rear extension core 43 includes a rear base part 43a, a rear inner extension part 43b, and a rear outer extension part 43c. The rear base portion 43a has an annular shape and a thin plate shape, and the outer edge portion on the radially outer side is in contact with the distal end portion of the rear peripheral wall portion 15b. The rear inner extension 43b is an annular or cylindrical portion whose tip extends from the outer edge on the rotor 12 side of the rear base 43a toward the rear frame end 15 along the central axis X direction. In the present embodiment, the entire inner peripheral surface of the rear inner extended portion 43 b faces the rotor 12.

  The rear inner extension 43b is for increasing the cross-sectional area of the magnetic path between the stator core 41 and the rotor 12. For this reason, the rear extension core 43 has a different shape from the core sheet constituting the intermediate portion 44. In the present embodiment, a rear outer extension 43c is further provided on the rear extension core 43 for increasing the cross-sectional area of the magnetic path. The rear outer extension 43c is an annular portion that is provided on the outer edge of the rear base 43a in the radial direction and extends outward in the radial direction of the stator core 41 to a position facing the rear seal surface S2 while being separated from the rear seal surface S2. is there. Specifically, the rear outer extended portion 43c includes a cylindrical portion extending from the outer edge portion on the radially outer side of the rear base portion 43a toward the front frame end 14 along the central axis X direction, and the front frame end of the cylindrical portion. And an annular portion extending radially outward from the 14 side.

  The front frame end 14 side of the front outer extension 42c and the front seal surface S1 are annular holding surfaces of the front seal member 45. In the present embodiment, the front seal member 45 is formed of an elastic member such as rubber as in the second embodiment, and more specifically, an O-ring is used. The front seal member 45 is provided in a compressed state between the front seal surface S1 and the front outer extension 42c. Thus, the front seal member 45 is in close contact with the front outer extension 42c and the front seal surface S1. Therefore, it is possible to prevent water from entering the space surrounded by the front frame end 14 and the stator core 31 from the gap between the front extension core 42 and the front peripheral wall portion 14b.

  The rear frame end 15 side of the rear outer extension 43c and the rear seal surface S2 are annular pressing surfaces of the rear seal member 46. In the present embodiment, like the front seal member 45, the rear seal member 46 is formed of an elastic member such as rubber, and more specifically, an O-ring is used. The rear seal member 46 is provided in a compressed state between the rear seal surface S2 and the rear outer extension 43c. As a result, the rear seal member 46 is in close contact with the rear outer extension 43c and the rear seal surface S2. Therefore, it is possible to prevent water from entering the space surrounded by the rear frame end 15 and the stator core 31 from the gap between the rear extension core 43 and the rear peripheral wall portion 15b.

  The effect of this embodiment explained in full detail above is demonstrated.

  The front outer extension 42 c of the front extension core 42 was used as a pressing surface for the front seal member 45. Further, the rear outer extension 43c of the rear extension core 43 is used as a pressing surface of the rear seal member 46. For this reason, as in the second embodiment, the structure such as the groove for providing the seal members 45 and 46 can be reduced from the frame ends 14 and 15, and the waterproof structure of the motor 30 can be realized with a simple configuration. can do.

  Further, among the plurality of core sheets constituting the stator core 41, only the front extension core 42 and the rear extension core 43 at both ends in the stacking direction are different from each other, and the front extension core 42 is provided with a front outer extension portion 42c, and the rear extension The core 43 is provided with a rear outer extension 43c. For this reason, even if it is a case where the front outer side expansion part 42c and the rear outer side expansion part 43c are provided, it does not lead to the increase in the kind of components.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  -In the said 2nd Embodiment, as shown in FIG. 4, in the stator core 31, it is good also considering the core sheet which comprises each of the intermediate part 39, the front large diameter part 32, and the front small diameter part 33 as the same shape. In FIG. 4, the same components as those shown in FIG. 2 are given the same reference numerals for the sake of convenience. In FIG. 4, hatching of the cross section of the core sheet is omitted.

  In the first embodiment, the front groove portion for the front seal member 22 is formed on the inner peripheral side of the front protruding portion 14c as shown in FIG. 5 without forming the front groove portion for the seal member on the front peripheral wall portion 14b. 14e may be formed. Thereby, while being accommodated in the front groove part 14e, the front seal member 22 can be provided in the state compressed between the outer peripheral surface of the stator core 13 and the front protrusion part 14c. Further, the rear groove portion 15e for the rear seal member 23 may be formed on the inner peripheral side of the rear protruding portion 15c without forming the rear groove portion for the seal member in the rear peripheral wall portion 15b. Accordingly, the rear seal member 23 can be provided in a state of being accommodated in the rear groove 15e and being compressed by being sandwiched between the outer peripheral surface of the stator core 13 and the rear protrusion 15c. In FIG. 5, the same components as those shown in FIG. 1 are given the same reference numerals for the sake of convenience.

  In the first embodiment, the seal member is installed by changing the shape of the stator core 24 as shown in FIG. 6 without forming the groove portion for the seal member in the front peripheral wall portion 14b and the rear peripheral wall portion 15b. A place may be secured. Specifically, the outer edge portion of the stator core 24 on the front frame end 14 side is formed with a front taper portion that is tapered from the front frame end 14 side toward the middle in the direction of the central axis X of the stator core 24. The front taper portion is a portion in which the stator core 24 is recessed with respect to each of the front end portion of the front peripheral wall portion 14b and the inner peripheral surface of the front protruding portion 14c. An annular space is formed by the front end portion of the front peripheral wall portion 14b, the inner peripheral surface of the front protruding portion 14c, and the front taper portion. The front seal member 25 is housed in this space, and is provided in a compressed state by being sandwiched between the front end portion of the front peripheral wall portion 14b, the inner peripheral surface of the front protruding portion 14c, and the front taper portion. . Further, the outer edge portion of the stator core 24 on the rear frame end 15 side is formed with a rear taper portion having a tapered shape from the rear frame end 15 side toward an intermediate portion of the central axis X of the stator core 24. The rear taper portion is a portion in which the stator core 24 is recessed with respect to each of the front end portion of the rear peripheral wall portion 15b and the inner peripheral surface of the rear protruding portion 15c. An annular space is formed by the tip of the rear peripheral wall 15b, the inner peripheral surface of the rear protrusion 15c, and the rear taper. The rear seal member 26 is housed in this space, and is provided in a compressed state by being sandwiched between the tip of the rear peripheral wall 15b, the inner peripheral surface of the rear protrusion 15c, and the rear taper. In FIG. 6, the same components as those shown in FIG. 1 are given the same reference numerals for the sake of convenience.

  In the third embodiment, the stator core 41 may not include any of the front extension core 42 and the rear extension core 43.

  In each of the above embodiments, the seal member is provided both between the front frame end 14 and the stator core and between the rear frame end 15 and the stator core, but is not limited thereto. A seal member may be provided between the front frame end 14 and the stator core and between the rear frame end 15 and the stator core.

  In each of the above embodiments, the motor is mounted on the vehicle with the cover surrounding the control board facing upward, but this is not limiting, and the motor is mounted on the vehicle with the cover surrounding the control board facing downward. May be.

  -The method of integrating the stator core 13, the front frame end 14 and the rear frame end 15 is not limited to the method of fixing with a fastener such as a through bolt.

  The motor is not limited to a motor for electric power steering, but may be a motor for other uses such as a power window or a wiper motor.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Rotary shaft, 12 ... Rotor, 13 ... Stator core, 14 ... Front frame end, 15 ... Rear frame end, 20 ... Front seal member, 21 ... Rear seal member

Claims (6)

A rotor (12) attached to a rotating shaft (11);
A first frame end (14) rotatably supporting one end side of the rotating shaft;
A second frame end (15) that rotatably supports the other end of the rotating shaft;
A stator core (13; 31; 41; 24) provided on the outer peripheral side of the rotor in a state sandwiched between the first frame end and the second frame end,
The first frame end is annularly in contact with the outer edge portion of the stator core on the first frame end side in the direction of the central axis of the rotating shaft,
The second frame end is annularly in contact with an outer edge portion of the stator core on the second frame end side in the central axis direction,
Abutting portions of the frame end and the stator core that are provided between at least one of the first frame end and the stator core and between the second frame end and the stator core and that face each other in the central axis direction. And an annular sealing member (20, 21; 37, 38; 45, 46; 22, 23; 25, 26) for preventing water from entering into the space surrounded by the frame end and the stator core. A rotating electric machine that is characterized. In the facing portion where at least one of the first frame end and the second frame end and the stator core face each other, an annular housing portion (14d, 15d; 14e, 15e) are formed,
The rotating electrical machine according to claim 1, wherein the seal member (20, 21; 22, 23; 25, 26) is accommodated in the annular accommodating portion. The stator core (31; 41) is formed by laminating a plurality of annular core members,
On the stator core side of at least one of the first frame end and the second frame end, an annular shape extending in the radial direction of the stator core is located on the radially outer side of the stator core with respect to the contact portion. Sealing surfaces (S1, S2) are formed,
Of the plurality of core members, the core member (32, 34; 42, 43) near the frame end on which the sealing surface is formed is positioned away from the sealing surface to a position facing the sealing surface. Having an annular extension (32a, 34a; 42c, 43c) extending outward in the radial direction of
The seal member (37, 38; 45, 46) is provided between the seal surface and the extension portion in a state of being pressed against the seal surface and the extension portion. The rotating electrical machine according to claim 1, wherein Of the plurality of core members, a core member near the frame end provided with the seal surface is provided apart from the frame end of the first frame end and the second frame end formed with the seal surface. The outer diameter of the large-diameter core member (32, 34) is a small-diameter core member (33, 34) that is a core member on the frame end side where the sealing surface is formed with respect to the large-diameter core member among the plurality of core members. 35) larger than the outer diameter,
The rotating electrical machine according to claim 3, wherein the extending portion (32a, 34a) is a portion of the large-diameter core member that protrudes outward from the small-diameter core member in the radial direction of the stator core. The plurality of core members have end core members (42, 43) that abut one of the first frame end and the second frame end,
The end core member has an annular inner extension extending from the outer edge portion on the rotor side along the central axis direction to the frame end side of the first frame end and the second frame end that comes into contact with each other. Part (42b, 43b),
The end core member further includes outer extension portions (42c, 43c) that extend outward in the radial direction of the stator core from an outer edge portion opposite to the rotor side as the extension portion. Item 4. The rotating electrical machine according to Item 3. The rotating electrical machine is mounted on a vehicle with the center axis extending in the vertical direction,
The seal member (20; 37; 45; 22; 25) is provided between the stator core and the frame end (14) disposed at least on the lower side of the first frame end and the second frame end. The rotating electrical machine according to any one of claims 1 to 5, wherein the rotating electrical machine is provided.

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