JP6416543B2 - Electric motor and electric motor integrated pump - Google Patents

Description

  The present embodiment relates to an electric motor.

  The electric motor has a terminal box on the outside of the frame member that houses the rotor. This terminal box is provided at a different position depending on the device to which the electric motor is applied, for example, left, right, or above. If frame members are prepared according to different positions of the terminal box in this way, a plurality of frame members are required even for the same type of electric motor. Therefore, the position of the terminal box is changed by reversing the frame member in the axial direction or rotating the frame member in the circumferential direction (see Patent Documents 1 and 2).

  However, in the case of an electric motor that is directly coupled to a pump, for example, the bracket that supports the rotor at the end of the electric motor has a drain portion for discharging unnecessary liquid. The drain portion is inclined downward in the gravitational direction from the center portion to the radially outer side for the function of discharging the liquid. For this reason, when the frame member is rotated in order to change the position of the terminal box, the bracket attached to the frame member also rotates, and there is a problem that the predetermined posture of the drain portion cannot be maintained.

JP 9-65598 A Japanese Patent Laid-Open No. 9-93853

  Then, it aims at providing the electric motor which respond | corresponds to the several positional relationship of a terminal box, without increasing the kind of a frame member or a bracket, and liquid is discharged | emitted reliably.

  In order to solve the above problems, the electric motor of the present embodiment includes a frame member, a bracket, a terminal box, a drain portion, an attachment portion, and a plurality of sets of attachment hole groups. The frame member has a cylindrical shape that houses the rotor. The bracket is attached to one end in the axial direction of the frame member, and rotatably supports the rotor. The terminal box is provided on the outer peripheral side of the frame member, and the positional relationship with respect to the bracket is changed by rotating the frame member in the circumferential direction. A drain part is provided in the surface side opposite to the said frame member of the said bracket, and discharges a useless liquid to the radial direction outer side from the center part which the said rotor penetrates. Three attachment parts are provided at equal angular intervals in the circumferential direction at the end of the frame member on the bracket side, and fixing members for fixing the bracket to the frame member are attached. The mounting hole group is provided in the bracket, and is provided at a position where the fixing member penetrates and overlaps with the mounting portion that rotates together with the frame member as the frame member rotates in the circumferential direction.

The schematic which looked at the bracket of the electric motor by a 1st embodiment from the arrow I direction of FIG. Schematic view from the direction of arrow II in FIG. Schematic showing an integrated pump according to the first embodiment Schematic which shows the electric motor by 1st Embodiment. The schematic which looked at the electric motor by a 1st embodiment from the pump part side It is the schematic which looked at the frame member of the electric motor by a 1st embodiment from the pump part side, and is a figure showing the section of a leg part Typical sectional drawing which expanded the fixing | fixed part of the frame member and bracket of the electric motor by 1st Embodiment. Schematic showing the position of the terminal box of the motor The schematic which looked at the bracket of the electric motor by a 2nd embodiment from the pump part side The schematic which looked at the electric motor by a 2nd embodiment from the pump part side

Hereinafter, a plurality of embodiments of an electric motor will be described based on the drawings.
(Integrated pump)
First, an integrated pump to which an electric motor is applied will be described. As shown in FIGS. 2 and 3, the integrated pump 10 includes an electric motor 11 and a pump unit 12 that are integrally formed. That is, the pump unit 12 is integrally coupled with the electric motor 11. In the integrated pump 10, the pump unit 12 is driven by the electric motor 11 to pressurize and discharge the sucked liquid. For example, water or oil is used as the liquid. The integrated pump 10 is generally used as a hydraulic pump. In this case, the liquid discharged by the integrated pump 10 is hydraulic oil.

(First embodiment)
Next, the electric motor 11 of 1st Embodiment used for the integrated pump 10 is shown in FIG. 4, FIG. The electric motor 11 includes a frame member 13, a bracket 14, and a terminal box 15. The frame member 13 is an aluminum die cast made of aluminum, for example. The frame member 13 is formed in a cylindrical shape, and a stator (not shown) is fixed inside. Moreover, the frame member 13 accommodates the rotor 16 rotatably inside. The frame member 13 is open at least at one end in the axial direction. The bracket 14 is formed in a plate shape from cast iron or the like. The bracket 14 is attached to one end of the frame member 13 in the axial direction, that is, the end on the open side. The bracket 14 has an opening 21 at the center as shown in FIG. A bearing 22 is provided in the opening 21. Thus, the bracket 14 rotatably supports one end portion of the rotor 16 accommodated in the frame member 13.

  As shown in FIGS. 4 and 5, the terminal box 15 is provided on the outer peripheral side of the frame member 13. The ends of the wirings electrically connected to the respective parts of the electric motor 11 are collected in this terminal box 15. The terminal box 15 is fixed at an arbitrary position in the circumferential direction of the frame member 13. The frame member 13 is supported by a pair of legs 24 as shown in FIGS. The pair of leg portions 24 are detachably attached to the frame member 13 by bolts 25 and nuts 26 as shown in FIG.

  In addition to the frame member 13, the bracket 14, and the terminal box 15, the electric motor 11 includes a drain portion 31 and an attachment portion 32 as shown in FIGS. 1, 5, and 6. The drain part 31 is provided in the bracket 14 as shown in FIGS. Specifically, the drain portion 31 is provided on the surface of the plate-like bracket 14 opposite to the frame member 13. The drain part 31 extends radially outward from the center part of the bracket 14. The bracket 14 has the opening part 21 which the rotor 16 penetrates in the center part as mentioned above. The drain portion 31 is formed in a groove shape from the center where the opening 21 is provided to the outside in the radial direction. And the drain part 31 inclines so that a radial direction outer side may be located below in the gravity direction compared with the center part side of this radial direction inner side. Here, the radially inner end of the drain portion 31 is an inner end 311, and the radially outer end of the drain portion 31 is an outer end 312.

In the case of the integrated pump 10, the liquid pressurized by the pump unit 12 may ooze out at the end of the pump unit 12 on the electric motor 11 side. The electric motor 11 may cause a problem due to the liquid oozing out from the pump unit 12. Therefore, the liquid that has oozed out of the pump unit 12 is discharged through the drain unit 31 located at the end of the electric motor 11 on the pump unit 12 side, thereby preventing entry into the electric motor 11 side. In the drain portion 31, the outer end 312 is below the inner end 311 in the direction of gravity. Therefore, useless liquid that oozes out from the pump unit 12 is discharged to the outside through the drain unit 31 by gravity. Thus, since the drain part 31 needs to discharge | emit the liquid, it is calculated | required that the outer side end 312 maintains the attitude | position which is below in the gravity direction rather than the inner side end 311 irrespective of the attitude | position of the frame member 13. . As shown in FIGS. 1 and 5, the drain portion 31 may be inclined rightward or leftward if the outer end 312 is below the inner end 311.
As shown in FIG. 6, the attachment portion 32 is provided at the end of the frame member 13 on the side where the bracket 14 is attached. In the case of the first embodiment, three mounting portions 32 are provided at equal angular intervals in the circumferential direction of the frame member 13.

  The bracket 14 has the ear | edge part 40 which protrudes to a radial direction outer side, as shown in FIG. The ear portion 40 protrudes radially outward from the outer peripheral wall of the bracket 14. In the case of the first embodiment, six ears 40 are provided at equal intervals in the circumferential direction of the bracket 14. This ear | edge part 40 has the attachment holes 41-46 which penetrate each in a plate | board thickness direction. Of these mounting holes 41 to 46, the mounting holes 41, 43, 45 constitute a first mounting hole group. Of the mounting holes 41 to 46, the mounting holes 42, 44, 46 constitute a second mounting hole group. Thus, the attachment holes 41 to 46 provided in the bracket 14 constitute a first attachment hole group or a second attachment hole group. That is, the electric motor 11 includes a first mounting hole group composed of mounting holes 41, 43, and 45 formed in the bracket 14 and a second mounting hole group composed of mounting holes 42, 44, and 46. ing. In the case of the first embodiment, the mounting holes 41, 43, 45 constituting the first mounting hole group are provided in the ear portion 40 at 120 ° intervals in the circumferential direction of the bracket 14. Similarly, the mounting holes 42, 44, 46 constituting the second mounting hole group are provided in the ear portion 40 at 120 ° intervals in the circumferential direction of the bracket 14. These mounting holes 41 to 46 are penetrated by a fixing member 51 formed of a bolt or the like as shown in FIG. The bracket 14 is fixed to the frame member 13 by tightening a fixing member 51 that passes through the mounting holes 41 to 46 to the frame member 13. The distal end of the fixing member 51 that passes through the attachment holes 41 to 46 is held by the attachment portion 32 of the frame member 13.

  In the case of the first embodiment, the position of the terminal box 15 provided on the frame member 13 is the left side as shown in FIG. 8 (A) or the right side as shown in FIG. 8 (B) when viewed from the bracket 14 side. Is set to one of the following. At this time, the position of the terminal box 15 is changed to the left or right by rotating the frame member 13 in the circumferential direction. On the other hand, the bracket 14 has the drain part 31 for discharging | emitting unnecessary liquid as mentioned above. The drain portion 31 is required to have the outer end 312 positioned below the inner end 311 in the direction of gravity in order to discharge the liquid.

  Here, when the bracket 14 is rotated integrally with the frame member 13 in order to change the position of the terminal box 15, the outer end 312 of the drain portion 31 is not necessarily positioned below the inner end 311. Therefore, the frame member 13 and the bracket 14 are required to rotate only in order to change the position of the terminal box 15 while maintaining the posture of the bracket 14 for the drain portion 31. Here, the frame member 13 has three attachment portions 32 at equal intervals in the circumferential direction as shown in FIG. Therefore, when the frame member 13 is rotated, the three attachment portions 32 are also rotated in the circumferential direction together with the frame member 13. As a result, in order to maintain the posture of the drain portion 31 provided on the bracket 14 even when the frame member 13 is rotated in accordance with the position of the terminal box 15, a plurality of types of brackets are used according to the rotation position of the frame member 13. 14 is required.

  In the first embodiment, the bracket 14 has an ear portion 40 according to the frame member 13 that is rotated according to the position of the terminal box 15. And this ear | edge part 40 is provided with at least any one of the attachment holes 41, 43, 45 used as a 1st attachment hole group, or the attachment holes 42, 44, 46 used as a 2nd attachment hole group. That is, when the terminal box 15 is positioned on the left side, the mounting holes 41, 43, 45 constituting the first mounting hole group of the bracket 14 and the mounting portion 32 of the frame member 13 overlap. Thereby, when the terminal box 15 is on the left side, the fixing member 51 is attached to the attachment portion 32 of the frame member 13 through the attachment holes 41, 43, 45 constituting the first attachment hole group. On the other hand, when the terminal box 15 is positioned to the right, the mounting holes 42, 44, 46 constituting the second mounting hole group of the bracket 14 and the mounting portion 32 of the frame member 13 overlap. Thereby, when the terminal box 15 is on the right side, the fixing member 51 is attached to the attachment portion 32 of the frame member 13 through the attachment holes 42, 44, and 46 constituting the second attachment hole group. As a result, even if the frame member 13 rotates according to the position of the terminal box 15, the bracket 14 is fixed to the frame member 13 while maintaining the posture of the drain portion 31. Note that the attachment holes 41 to 46 need not be provided in all of the ear portions 40 as shown in FIG. For example, as shown in FIG. 5, for the ear portion 40 that does not require the fixing member 51 to be attached depending on the position of the terminal box 15, it is not necessary to provide an attachment hole in order to reduce the number of steps.

  As described above, in the electric motor 11 of the first embodiment, the bracket 14 has the mounting holes 41, 43, 45 constituting the first mounting hole group and the mounting holes 42, 44, 46 constituting the second mounting hole group. Is provided. Thus, the bracket 14 and the frame member 13 can be used without changing the bracket 14 even if the frame member 13 is rotated in order to change the position of the terminal box 15 in two places, left or right. The bracket 14 is fixed without changing its posture. Therefore, it is not necessary to design the frame member 13 and the bracket 14 according to the position of the terminal box 15, and a common bracket 14 can be used regardless of the position of the terminal box 15. Therefore, it is possible to cope with a plurality of positional relationships of the terminal box 15 without causing an increase in the types of the frame member 13 and the bracket 14, and reliably discharge the liquid entering from the pump unit 12 through the drain unit 31. can do.

  In the case of the first embodiment, the bracket 14 and the frame member 13 are fixed by fixing members 51 at three locations in the circumferential direction. Therefore, three mounting holes 41, 4345 constituting the first mounting hole group and three mounting holes 42, 44, 46 constituting the second mounting hole group are provided in the circumferential direction of the frame member 13. Here, when the number of parts is reduced while increasing the degree of freedom of the position of the terminal box 15, it is conceivable to fix the frame member 13 and the bracket 14 with fixing members 51 such as bolts at four locations in the circumferential direction. However, since the frame member 13 is manufactured using a molding die, it is subject to manufacturing restrictions during molding. For example, when the frame member 13 and the bracket 14 are fixed at four locations in the circumferential direction, the position where the leg portion 24 for fixing the frame member 13 is attached is limited to a specific position. This is because the motor 11 defines a so-called center height, which is a distance from the lower end of the leg portion 24 to the center, according to the standard, and the mounting position of the leg portion 24 is limited to satisfy this center height. Because it is done. However, when the frame member 13 and the bracket 14 are fixed at four locations in the circumferential direction, the position for attaching the leg portion 24 depends on the structural limitations of the mold and the manufacturing limitations in the molding process. It will be located in the parting surface which is a boundary of a plurality of molds which constitute a mold of member 13. Since it is difficult to ensure the accuracy of the shape of the parting surface, there is a problem that the mounting position of the leg portion 24 located on the parting surface is low in accuracy. On the other hand, when the frame member 13 and the bracket 14 are fixed at three locations in the circumferential direction as in the first embodiment, the dividing surface does not overlap with the mounting position of the leg portion 24. Therefore, when the frame member 13 and the bracket 14 are fixed at three locations in the circumferential direction as in the first embodiment, the shape accuracy at the position where the leg portion 24 is attached can be increased, and the center height accuracy can be easily ensured. Can be.

(Second Embodiment)
An electric motor according to the second embodiment is shown in FIGS.
In the case of the second embodiment, the position of the terminal box 15 provided on the frame member 13 is, as seen from the bracket 14 side, as shown in FIG. 8 (A) on the left side or in FIG. 8 (B). In addition to the right side, as shown in FIG. At this time, the position of the terminal box 15 is changed leftward, rightward or upward by rotating the frame member 13 in the circumferential direction. That is, in the case of 2nd Embodiment, the position of the terminal box 15 is set to three types.

  In 2nd Embodiment, the bracket 14 has the ear | edge part 40 which protrudes to a radial direction outer side from an outer peripheral wall, as shown in FIG. In the case of the second embodiment, nine ears 40 are provided in the circumferential direction of the bracket 14. This ear | edge part 40 has the attachment holes 61-69 which penetrate each in a plate | board thickness direction. Of the mounting holes 61 to 69, the mounting holes 61, 64, and 67 constitute a first mounting hole group. Of the mounting holes 61 to 69, the mounting holes 62, 65, and 68 constitute a second mounting hole group. Of the mounting holes 61 to 69, the mounting holes 63, 66, and 69 constitute a third mounting hole group. Thus, the attachment holes 61 to 69 provided in the bracket 14 constitute a first attachment hole group, a second attachment hole group, or a third attachment hole group. That is, the electric motor 11 includes a first mounting hole group composed of mounting holes 61, 64, 67 formed in the bracket 14, a second mounting hole group composed of mounting holes 62, 65, 68, and 63 , 66, 69 and a third mounting hole group. In the case of the second embodiment, the mounting holes 61, 64, 67 constituting the first mounting hole group are provided in the ear portion 40 at 120 ° intervals in the circumferential direction of the bracket 14. Similarly, the mounting holes 62, 65, 68 constituting the second mounting hole group and the mounting holes 63, 66, 69 constituting the third mounting hole group are ear portions at intervals of 120 ° in the circumferential direction of the bracket 14. 40.

  In the case of the second embodiment, when the terminal box 15 is on the upper side as shown in FIG. 8C, the mounting holes 62, 65, 68 constituting the second mounting hole group of the bracket 14 and the mounting portion of the frame member 13 32 overlaps. Thereby, as shown in FIG. 10, when the terminal box 15 is on the upper side, the fixing member 51 is attached to the attachment portion 32 of the frame member 13 through the attachment holes 62, 65, 68 of the second attachment hole group. . Further, when the terminal box 15 is on the left side as shown in FIG. 8A, the mounting holes 61, 64, 67 constituting the first mounting hole group of the bracket 14 and the mounting portion 32 of the frame member 13 overlap. . Thereby, when the terminal box 15 is on the left side, the fixing member 51 is attached to the attachment portion 32 of the frame member 13 through the attachment holes 61, 64, 67 of the first attachment hole group. Furthermore, when the terminal box 15 is on the right side as shown in FIG. 8C, the mounting holes 63, 66, 69 of the third mounting hole group of the bracket 14 and the mounting portion 32 of the frame member 13 overlap. Thereby, when the terminal box 15 is on the right side, the fixing member 51 is attached to the attachment portion 32 of the frame member 13 through the attachment holes 63, 66, and 69 of the third attachment hole group. As a result, even if the frame member 13 is rotated according to the position of the terminal box 15, the frame member 13 and the bracket 14 are fixed by the fixing member 51.

  In the case of the second embodiment, the bracket 14 includes mounting holes 61, 64, and 67 that constitute the first mounting hole group, mounting holes 62, 65, and 68 that constitute the second mounting hole group, and a third mounting hole group. Mounting holes 63, 66, and 69 are provided. As a result, the frame member 13 and the bracket 14 change the posture of the bracket 14 without replacing the bracket 14 even if the frame member 13 is rotated to change the position of the terminal box 15 in three places. It is fixed without doing. Therefore, it is not necessary to design the frame member 13 and the bracket 14 according to the position of the terminal box 15. Therefore, it is possible to cope with a plurality of positional relationships of the terminal box 15 without causing an increase in the types of the frame member 13 and the bracket 14, and reliably discharge the liquid entering from the pump unit 12 through the drain unit 31. can do.

  As mentioned above, although several embodiment of this invention was described, these embodiment was 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 included in the invention described in the claims and the equivalents thereof.

  In the drawings, 11 is an electric motor, 13 is a frame member, 14 is a bracket, 15 is a terminal box, 16 is a rotor, 31 is a drain portion, 32 is a mounting portion, 41 to 46 are mounting holes (a group of mounting holes), 51 is Reference numerals 61 to 69 denote mounting holes (mounting hole group).

Claims (2)

A cylindrical frame member that houses the rotor;
A bracket attached to one end in the axial direction of the frame member, and rotatably supporting the rotor;
The frame member is provided on the outer peripheral side of the frame member, and when the frame member is rotated in the circumferential direction, when viewed from the bracket side, the positional relationship with respect to the bracket is either the left side or the right side of the frame member. A terminal box that changes to
A drain part provided on the surface of the bracket opposite to the frame member, for draining useless liquid radially outward from a central part through which the rotor penetrates;
Three mounting portions are provided at equal angular intervals in the circumferential direction on the bracket side end of the frame member, and a fixing member for fixing the bracket to the frame member is attached;
An ear portion provided at the bracket, the fixing member penetrates, and an ear portion provided at a position overlapping the attachment portion rotating with the frame member in accordance with the rotation of the frame member in the circumferential direction ;
Six ears are provided corresponding to two types of positional relationship of the terminal box with respect to the frame member,
According to the positional relationship between the bracket and the frame member, the six attachment portions include a first attachment hole group including the three attachment holes, or three attachments different from the first attachment hole group. An electric motor provided with at least one of a second mounting hole group consisting of holes . An electric motor according to claim 1;
A pump unit configured integrally with the electric motor, driven by the electric motor, and pressurizing and discharging the sucked liquid;
An electric motor integrated pump.

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