JP2017103891A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loosening of a screw member by vibration.SOLUTION: The rotary electric machine of the embodiment comprises: a bracket side seat portion projecting radially from an outer peripheral surface of a bracket; a frame side seat portion in which bracket side seats are stacked from the axial direction; and a screw member for joining the bracket side seat portion and the frame side seat portion. On the bracket side seat portion, a contact portion which is in surface contact with the frame side seat portion on the outer peripheral side as compared with the contact point closest to the bracket among the outer peripheral surface of the rod portion of the screw member when viewed from the axial direction and a relief portion which is spaced apart from the frame side seat portion on the outer peripheral side are provided.SELECTED DRAWING: Figure 2

Description

  Embodiments relate to a rotating electrical machine.

  Some rotating electrical machines have a frame and a bracket. The frame has a cylindrical shape, and the motor main body is accommodated in the frame. The bracket is provided at one end of the frame, and rotatably supports the rotating shaft of the motor body. The bracket is provided with a bracket side seat that projects radially from the outer peripheral surface of the bracket, and the frame is provided with a frame side seat. A screw member is inserted into the frame side seat portion from the axial direction through the bracket side seat portion, and the frame and the bracket are fixed by joining the frame side seat portion and the bracket side seat portion with the screw member. Yes.

Japanese Utility Model Publication No.59-3754

  Patent Document 1 describes that the entire bracket side seat portion is separated from the frame side seat portion in the axial direction, and the screw member is prevented from loosening by using the elastic restoring force of the frame side seat portion. In the case of this patent document 1, the joining force between a bracket side seat part and a frame side seat part is weak, and rain water etc. adhere easily to the rod part of a screw member.

  A rotating electrical machine according to an embodiment includes a cylindrical frame in which a motor body having a rotating shaft is accommodated, a bracket provided at one end of the frame and rotatably supporting the rotating shaft, and the bracket A bracket side seat that protrudes radially from the outer peripheral surface of the bracket, and a frame side seat that is provided on the frame and in which the bracket side seat is overlapped in the axial direction. And a screw member that is inserted into the bracket side seat portion and the frame side seat portion and that is oriented in the axial direction and that joins between the two. Compared with the contact closest to the bracket among the outer peripheral surfaces of the rod portion of the screw member as viewed from the direction, the contact portion that is in surface contact with the frame side seat portion on the outer peripheral side and the frame on the outer peripheral side. Relief portion away from the no-side seat portion is provided.

The figure which shows Example 1 (a is Xa view which shows the external appearance of a rotary electric machine, b is Xb view figure) The figure which shows the joining state between a frame side seat part and a bracket side seat part (a is sectional drawing which follows the X2 line of FIG. 1, b is sectional drawing which follows the Xb line of FIG. 2). FIG. 2B shows the second embodiment. FIG. 2B equivalent diagram showing the third embodiment. FIG. 2 equivalent diagram showing Example 4 FIG. 2 (b) equivalent diagram showing the fifth embodiment. FIG. 2 (b) equivalent diagram showing Example 6.

  The motor frame 1 shown in FIG. 1 has a horizontal cylindrical shape with both end faces opened, and corresponds to a frame. The left end surface in FIG. 1A of the motor frame 1 is referred to as an anti-load side end surface, and the right end surface is referred to as a load side end surface.

  The motor frame 1 is formed by casting aluminum, and two legs 2 are fixed to the motor frame 1 as shown in FIG. Each of these two legs 2 protrudes downward from the outer peripheral surface of the motor frame 1, and a horizontal mounting base 3 is fixed to each lower end portion of the two legs 2. Each of these two mounting bases 3 is inserted with a plurality of screws, and the motor frame 1 is fixed by screwing each of the plurality of screws of the two mounting bases 3 to the installation surface.

  A stator core is fitted on the inner peripheral surface of the motor frame 1. This stator core has a cylindrical shape formed by laminating electromagnetic steel plates, and a three-phase stator winding is mounted on the stator core. A squirrel-cage winding is accommodated in the stator core. This squirrel-cage winding is formed by connecting two end ring rings opposed in the horizontal direction by a plurality of conductors, and a horizontal rotating shaft is fixed to the squirrel-cage winding. The stator core, the stator winding, the squirrel-cage winding, and the rotating shaft constitute a motor body.

  As shown in FIG. 1, a box base 4 is fixed to the motor frame 1. The box base 4 protrudes from the outer peripheral surface of the motor frame 1 in the horizontal direction, and a terminal box 5 is fixed to the tip of the box base 4. A plurality of terminals are accommodated in the terminal box 5, and the three-phase stator windings of the motor body are connected to the terminals in the terminal box 5.

  As shown in FIG. 1, an anti-load side bracket 6 is fixed to the motor frame 1, and the anti-load side bracket 6 covers the anti-load side end face of the motor frame 1 from the axial direction. A bearing is mounted on the anti-load side bracket 6, and the anti-load side end portion of the rotating shaft of the motor body is rotatably supported by the anti-load side bracket 6 via the bearing.

  As shown in FIG. 1, a load side bracket 7 is fixed to the motor frame 1. The load side bracket 7 is formed by pouring molten cast iron into a mold and corresponds to a bracket. The load side bracket 7 has a cylindrical portion 8 and a lid portion 9. The cylindrical portion 8 has a horizontal short cylindrical shape, and the end surface on the side opposite to the load of the cylindrical portion 8 is in contact with the end surface on the load side of the motor frame 1. The lid 9 covers the load side end surface of the motor frame 1 from the axial direction, and has an annular shape. A bearing 10 is attached to the lid portion 9, and a load side end portion of the rotating shaft of the motor body is rotatably supported by the load side bracket 7 via the bearing 10.

  As shown in FIG. 1, a water supply pump 11 is fixed to the lid portion 9 of the load side bracket 7. This water supply pump 11 has a casing and an impeller, and the load side end of the rotating shaft of the motor body is directly connected to the impeller. That is, the motor main body functions as a drive source for driving the water supply pump 11, and the water supply pump 11 corresponds to a load of the motor main body.

  A groove portion 12 is formed in the lid portion 9 of the load side bracket 7 as shown in FIG. The groove 12 is linearly oriented in the radial direction when viewed from the axial direction, and is recessed toward the anti-load side when viewed from the radial direction. This groove portion 12 has an inner peripheral side inlet disposed at a higher position than the outer peripheral side outlet, and drops liquid onto the installation surface when liquid such as water or oil is discharged from the water supply pump 11. .

  As shown in FIG. 1, nine bracket side seat portions 13 are integrally formed on the load side bracket 7. Each of these nine bracket side seat portions 13 protrudes radially from the outer peripheral surface of the cylindrical portion 8 of the load side bracket 7 and has a round hole 14 formed of a horizontal through hole as shown in FIG. doing. As shown in FIG. 1, three of these nine bracket side seats 13 are arranged at an equal pitch of 30 ° around the vertical reference line VL, and the other three have a horizontal reference line HL. They are arranged at an equal pitch of 30 ° as a reference, and the remaining three are arranged at an equal pitch of 30 ° with respect to the reference line HL.

  As shown in FIG. 2, nine frame side seat portions 15 are integrally formed on the motor frame 1 at the load side end portion. Each of these nine frame side seat portions 15 projects radially from the outer peripheral surface of the motor frame 1 and has a vertical seat surface 16. These nine frame side seat portions 15 are arranged in the same pattern as the bracket side seat portion 13 in the circumferential direction, and have horizontal screw holes 17 that open toward the load side.

  As shown in FIG. 2, the screw portion 19 of the screw 18 is inserted into the round hole 14 in three of the nine bracket side seat portions 13 from the load side. As shown in FIG. 1, these three bracket side seat portions 13 are spaced apart at an equal pitch of 120 ° in the circumferential direction. As shown in FIG. 2, each screw portion 19 of the three screws 18 is a frame. Screwed into the screw hole 17 of the side seat 15, the heads 20 of the three screws 18 are in pressure contact with the bracket side seat 13 from the load side. Each of these three screws 18 corresponds to a screw member, and each screw portion 19 of each of the three screws 18 corresponds to a rod portion.

  Each of the nine bracket side seat portions 13 is formed with a relief portion 21 as shown in FIG. Each of these nine relief portions 21 is a portion spaced from the seat surface 16 of the frame side seat portion 15 toward the load side, and is disposed on the outer peripheral side of the bracket side seat portion 13 as compared with the round hole 14. Each of these nine relief portions 21 has an opening at its one end surface in the circumferential direction, the other end surface in the circumferential direction, and a distal end surface in the radial direction, and has a bottom surface.

  The contact P in FIG. 2 is the point closest to the lid portion 9 of the load side bracket 8 on the outer peripheral surface of the screw portion 19 of the screw 18 when viewed from the axial direction, and the tangent L is the screw of the screw 18 when viewed from the axial direction. Of the tangent lines in contact with the outer peripheral surface of the portion 19, the straight line passes through the contact point P.

  As shown in FIG. 2, a contact portion 22 is formed on each of the nine bracket side seat portions 13. Each of these nine contact portions 22 is a portion that is in surface contact with the seat surface 16 of the frame side seat portion 15, and the load side bracket 7 is configured such that the contact portions 22 of the three bracket side seat portions 13 are seated on the frame side seat portion 15. It is fixed to the motor frame 1 by being joined to the surface 16 by the fastening force of the screws 18. Each of these nine contact portions 22 is set on the inner peripheral side of the escape portion 21 including the round hole 14 of the bracket side seat portion 13 when viewed from the axial direction, and is compared with the contact P when viewed from the axial direction. And a portion located on the outer peripheral side.

According to the said Example 1, there exists the following effect.
Since the contact portion 22 is provided on the bracket side seat portion 13, the bracket side seat portion 13 comes into surface contact with the seat surface 16 of the frame side seat portion 15 at the contact portion 22. Therefore, since the joining force between the bracket side seat portion 13 and the frame side seat portion 15 is improved, it is possible to sufficiently withstand the load of the water supply pump 11. In addition, since rainwater and liquid from the water supply pump 11 are not easily applied to the screw portion 19 of the screw 18, it is possible to prevent the screw portion 19 from being rusted.

  An escape portion 21 is provided in the bracket side seat portion 13. Therefore, since the escape portion 21 generates an elastic restoring force toward the load side, it is possible to prevent the screw 18 from being loosened by vibration transmitted from the water supply pump 11 to the bracket side seat portion 13. In addition, since the material for the bracket side seat portion 13 is small, material costs and processing costs can be kept low.

  Three of the nine bracket side seat portions 12 arranged at an equal pitch in the circumferential direction were joined to the frame side seat portion 15 with screws 18. Therefore, since the fastening force of the screw 18 is distributed in the circumferential direction, the joining force between the frame 1 and the load side bracket 7 is improved. Moreover, three screws are provided between the frame 1 and the load side bracket 7 when the motor frame 1 is rotated 120 ° with respect to the load side bracket 7 and 240 ° without changing the angle of the load side bracket 7. 18 can be joined at an equal pitch, so that the terminal box 5 can be arranged in any one of three different directions while maintaining the liquid discharging function of the groove 12.

  Each of the nine bracket side seat portions 13 is formed with an inclined surface 31 as shown in FIG. Each of the nine inclined surfaces 31 has the center in the circumferential direction of the bottom surface of the escape portion 21 as a vertex, and the load is applied from the center in the circumferential direction of the bottom surface of the escape portion 21 toward one side in the circumferential direction. It has a planar shape that approaches the outer peripheral surface of the side bracket 7. Each of these nine inclined surfaces 31 is a part of the bottom surface of the escape portion 21 and is inclined with respect to the tangent L.

According to the said Example 2, there exist the following effects.
A part of the bottom surface of the escape portion 21 is an inclined surface 31. Accordingly, when liquid or rainwater from the water supply pump 11 enters between the escape portion 21 of the bracket side seat portion 13 and the seat surface 16 of the frame side seat portion 15, it is discharged along the inclined surface 31. It is possible to prevent rainwater or the like from accumulating between the escape portion 21 of the portion 13 and the seat surface 16 of the frame side seat portion 15.

  In each of the nine bracket side seat portions 13, an inclined surface 41 is formed in addition to the inclined surface 31 as shown in FIG. 4. Each of these nine inclined surfaces 41 shares an apex with the inclined surface 31, and has a planar shape that approaches the outer peripheral surface of the load side bracket 7 toward the other circumferential side opposite to the inclined surface 31. There is no. Each of these nine inclined surfaces 41 is a part of the bottom surface of the escape portion 21 and is inclined with respect to the tangent L.

According to the said Example 3, there exist the following effects.
The entire bottom surface of the escape portion 21 is inclined. Therefore, when liquid or rainwater from the water supply pump 11 enters between the escape portion 21 of the bracket side seat portion 13 and the seat surface 16 of the frame side seat portion 15, it is discharged along the inclined surface 31 or the inclined surface 41. Further, it is possible to prevent rainwater or the like from accumulating between the escape portion 21 of the bracket side seat portion 13 and the seat surface 16 of the frame side seat portion 15.

  As shown in FIG. 5, each of the nine bracket side seat portions 13 is formed with a relief portion 51, and each of the nine relief portions 51 is on the outer peripheral side of the frame side seat portion 15 compared to the contact point P. It has a portion that is spaced from the seat surface 16 toward the load side. Each of these nine relief portions 51 is disposed on one side of the bracket side seat portion 13 with respect to the center in the circumferential direction, and includes half of the screw portion 19 of the screw 18 as viewed from the axial direction. Is set. Each of these nine relief portions 51 has an end face in the circumferential direction and a distal end surface in the radial direction, and each bottom face of the nine relief portions 51 is set to a plane parallel to the tangent line L. Yes.

  Each of the nine bracket side seat portions 13 is formed with a contact portion 52 arranged in the circumferential direction with respect to the escape portion 51 as shown in FIG. Each of these nine contact portions 52 has a portion in surface contact with the seat surface 16 of the frame side seat portion 15 on the outer peripheral side compared to the contact point P, and is half of the screw portion 19 of the screw 18 as viewed from the axial direction. It is set including.

According to the said Example 4, there exists the following effect.
A contact portion 52 is provided on the bracket side seat portion 13. Therefore, since the joining force between the bracket side seat portion 13 and the frame side seat portion 15 is improved, it is possible to sufficiently withstand the load of the water supply pump 11. In addition, since it is difficult for the liquid to be applied to the screw portion 19 of the screw 18, it is possible to prevent the screw portion 19 from being rusted.

  An escape portion 51 is provided in the bracket side seat portion 13. Therefore, since the escape portion 51 generates an elastic restoring force toward the load side, it is possible to prevent the screw 18 from loosening due to vibration transmitted from the water supply pump 11 to the bracket side seat portion 13. In addition, since the material for the bracket side seat portion 13 is small, material costs and processing costs can be kept low.

  As shown in FIG. 6, each of the nine bracket side seat portions 13 is formed with an inclined surface 61, and each of the nine inclined surfaces 61 extends from one end to the other end in the circumferential direction. 7 is a flat surface approaching the outer peripheral surface. Each of these nine inclined surfaces 61 corresponds to the entire bottom surface of the escape portion 51 and is inclined with respect to the tangent L.

According to the said Example 5, there exist the following effects.
Since the entire bottom surface of the escape portion 51 is the inclined surface 61, it is possible to prevent rainwater or the like from accumulating between the bracket side seat portion 13 and the frame side seat portion 15.

  Each of the nine bracket side seat portions 13 is formed with an escape portion 71 as shown in FIG. Each of these nine relief portions 71 has a portion that is separated from the seat surface 16 of the frame side seat portion 15 to the load side on the outer peripheral side compared to the contact point P. The bracket side seat portion 13 has a circumferential direction. It arrange | positions on the opposite side to the escape part 51 compared with the center. Each of these nine relief portions 71 has an inclined surface 72. Each of these nine inclined surfaces 72 corresponds to the entire bottom surface of the escape portion 71 and is set to a plane inclined with respect to the tangent line L.

  As shown in FIG. 7, a contact portion 73 is formed on each of the nine bracket side seat portions 13. Each of these nine contact portions 73 has a portion that is in surface contact with the seat surface 16 of the frame side seat portion 15 on the outer peripheral side compared to the contact P, and is located at the center in the circumferential direction of the bracket side seat portion 12. Compared with the contact part 52, it is arrange | positioned.

According to the said Example 6, there exist the following effects.
A contact portion 73 is provided on the bracket side seat portion 13. Therefore, the joining force between the bracket side seat portion 13 and the frame side seat portion 15 is improved, and the liquid is less likely to be applied to the screw portion 19 of the screw 18. An escape portion 71 is provided in the bracket side seat portion 13. Therefore, it is possible to prevent the screws 18 from being loosened by vibrations transmitted from the water supply pump 11 to the bracket side seat portion 13, and the material for the bracket side seat portion 13 can be reduced. Since the entire bottom surface of the escape portion 71 is the inclined surface 72, it is possible to prevent rainwater or the like from accumulating between the bracket side seat portion 13 and the frame side seat portion 15.

In the first to sixth embodiments, a motor body different from the three-phase squirrel-cage induction motor may be housed in the motor frame 1.
In the said Examples 1-6, you may connect the load different from the feed water pump 11 to the rotating shaft of a motor main body.

  In the first to sixth embodiments, the load side bracket 7 may be provided with a number of bracket side seat portions 13 different from nine. In this case, it is preferable to provide the same number of frame side seats 15 as the bracket side seats 13 in the motor frame 1.

In the said Examples 1-6, you may fasten the bracket side seat part 13 and the frame side seat part 15 between a volt | bolt and a nut. In this case, the bolt corresponds to the screw member.
As mentioned above, although the Example of this invention was described, this Example is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention and are also included in the invention described in the claims and the equivalent scope thereof.

  1 is a motor frame (frame), 7 is a load side bracket (bracket), 13 is a bracket side seat, 15 is a frame side seat, 18 is a screw (screw member), 19 is a screw (rod), and 21 is An escape portion, 22 is a contact portion, 31 is an inclined surface, 41 is an inclined surface, 51 is an escape portion, 61 is an inclined surface, 71 is an escape portion, 72 is an inclined surface, and 73 is a contact portion.

Claims (4)

A cylindrical frame in which a motor body having a rotation shaft is stored;
A bracket provided at one end of the frame, the bracket rotatably supporting the rotating shaft;
A bracket side seat that is provided in the bracket and protrudes radially from the outer peripheral surface of the bracket;
A frame side seat portion in which the bracket side seat portion is overlapped from the axial direction;
It is inserted into the bracket side seat part and the frame side seat part, and includes a screw member that is oriented in the axial direction and joins between the two.
The bracket side seat portion includes a contact portion that is in surface contact with the frame side seat portion on the outer peripheral side of the outer peripheral surface of the rod portion of the screw member when viewed from the axial direction, as compared with the contact closest to the bracket. A rotating electrical machine characterized in that an escape portion that is spaced apart from the frame side seat portion is provided on the outer peripheral side. The frame is provided with three arranged side by side at a substantially equal pitch in the circumferential direction as the frame side seat portion,
2. The rotating electrical machine according to claim 1, wherein the bracket is provided with three bracket side seat portions joined to the frame side seat portion from the axial direction by the screw member.   The rotating electrical machine according to claim 1 or 2, wherein the bracket side seat portion is provided with the contact portion and the relief portion arranged in a circumferential direction.   The bracket side seat portion has an inclined surface that is inclined with respect to the tangent line that contacts the outer peripheral surface of the rod portion of the screw member as viewed from the axial direction and that passes through the contact point. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is provided as a part or as a whole.

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