JP2013126275A - Frame structure of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a padding part for assembling different members, such as a leg and a suspension bolt without reducing cooling performance.SOLUTION: In the frame structure of a motor M1 including a load side cover 16 and an anti-load side cover 18 sandwiching a frame body 14, the load side cover 16 and the anti-load side cover 18, respectively, include seat parts 22 and 24 for fastening a through bolt 26; the frame body 14, the load side cover 16 and the anti-load side cover 18 are coupled by the through bolt 26 through the seat parts 22 and 24; the frame body 14 has a padding part 28 for fixing different members to the frame body 14 between the seat parts 22 and 24; and the padding part 28 has a through hole 28A for inserting the through bolt 26.

Description

  The present invention relates to a frame structure of a motor.

  Patent Document 1 discloses a gear motor in which a motor and a speed reducer are combined together. The motor in this gear motor has a frame structure in which a load side cover and an anti-load side cover are separately provided with a frame body interposed therebetween.

  The load side cover and the anti-load side cover are each provided with a seat for fastening a through bolt, and the frame body, the load side cover, and the anti-load side cover are separated by a single through bolt through the seat. It is connected.

  A configuration is adopted in which a cooling fan is attached to the outer side in the axial direction of the anti-load side cover, and the frame main body is cooled by cooling air generated by the cooling fan.

Japanese Patent Laid-Open No. 2003-143806 (FIG. 3)

  A motor may be provided with a leg portion for attaching the motor itself to a floor or a pedestal of an industrial machine, or a suspension bolt for lifting the motor itself.

  However, it is considered that when a built-up portion for attaching such legs and suspension bolts is provided on the frame body, the smooth flow of cooling air by the cooling fan is hindered, and the cooling performance may be reduced accordingly. It is done.

  In particular, in a structure in which the frame main body, the load side cover, and the anti-load side cover are fastened using through bolts (the through bolt exists over the entire length of the frame main body and needs to be removed at the time of disassembly. For this reason, the build-up portion was formed so as to avoid the through bolt. Therefore, there was a possibility that the influence was particularly large.

  The present invention has been made paying attention to such a conventional problem, and it is possible to form a built-up part for attaching another member such as a leg part or a suspension bolt without lowering the cooling performance. An object of the present invention is to provide a frame structure of a motor that can be used.

  The present invention provides a motor frame structure including a load side cover and an anti-load side cover with a frame body interposed therebetween, and the load-side cover and the anti-load side cover each include a seat portion for fastening a through bolt. The frame main body, the load side cover, and the anti-load side cover are connected by the one through bolt through the seat portion, and the frame main body is separated from the frame main body by another member. The above-mentioned problem is solved by having a built-up portion for attaching the through-hole, and the built-up portion has a through hole for inserting the through bolt.

  In the present invention, as a place (position) where the build-up portion is formed in the frame body, attention is paid to a portion where a through bolt for connecting the load side cover and the anti-load side cover is incorporated.

  As described above, conventionally, the built-up portion is formed at a position avoiding the through bolt. However, since the through-bolt is incorporated by using two seat portions, that is, the seat portion of the load side cover and the seat portion of the anti-load side cover, the space between the seat portion and the seat portion is originally a cooling fan. The cooling air has not been sufficiently applied. The present invention pays attention to this fact, and dares to provide a built-up portion for attaching another member and arrange it between the seat portion and the seat portion.

  In order to enable this arrangement, the built-up portion according to the present invention has a through-hole for inserting a through bolt (in order to avoid interference with the through bolt). As a result, the through bolt can be attached / removed through the through-hole of the built-up portion without hindrance regardless of the presence of the built-up portion.

  On the other hand, since the build-up portion is formed between the seat portion of the through bolt and the seat portion, it is not necessary to form the build-up portion (which has been conventionally formed) in the other portions. Therefore, the cooling air from the cooling fan can be smoothly flowed around the frame body (with no obstacles), and as a result, the conventional build-up portion is formed at a position where the flow of the cooling air is obstructed. Compared with the situation) cooling performance can be increased.

  According to the present invention, it is possible to form a built-up portion for assembling a separate member such as a leg portion or a suspension bolt without lowering the cooling performance.

The principal part enlarged front view of the gear motor with which the motor and speed reducer which concern on an example of embodiment of this invention were integrated. Overall plan view of the gear motor of FIG. Overall side view of the gear motor of FIG. (A) perspective view of the gear motor of FIG. 1, and (B) perspective view seen from another angle 1 is a perspective view of only the frame body of the motor of the gear motor of FIG. Side view of only the frame body of the motor of the gear motor of FIG.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is an enlarged front view of a main part of a gear motor in which a motor according to an example of an embodiment of the present invention is integrated with a speed reducer. 2 is an overall plan view, and FIG. 3 is an overall side view. FIG. 4 is a perspective view of the gear motor of FIG. 1 viewed from different angles. 5 is a perspective view of only the frame body of the geared motor, and FIG. 6 is a side view thereof.

  The motor M1 of the gear motor GM1 is surrounded by the frame 12. The frame 12 is mainly composed of a frame main body 14, a load side cover 16 and an anti-load side cover 18. The frame main body 14, the load-side cover 16, and the anti-load-side cover 18 are threaded through the load bolts 26 via the load-side seat portion 22 provided on the load-side cover 16 and the anti-load-side seat portion 24 provided on the anti-load-side cover 18. Are connected by

  A built-up portion 28 is formed between the load side seat portion 22 and the anti-load side seat portion 24 of the frame body 14. The build-up portion 28 is used for attaching another member (described later) to the frame body 14.

  Details will be described below.

  The frame main body 14 of the motor M1 has a cylindrical shape as a whole and has a mounting surface 30A for the terminal box 30. On the outer periphery of the frame body 14, cooling fins 32 (32A to 32D) are integrally formed. As particularly well shown in FIG. 6, the cooling fins 32 attach the frame body 14 (rather than projecting radially from the frame body 14), for example, the mounting surface of the terminal box 30 (not shown in FIG. 6). When the frame main body 14 is placed so that 30A is in the vertical direction, it protrudes in the vertical direction X and the horizontal direction Y.

  In this embodiment, the cooling fin 32 has a side S1 whose tip is parallel to the mounting surface 30A of the terminal box 30 when the cross section perpendicular to the axis of the frame body 14 is viewed from the axial direction (state of FIG. 6). The protruding lengths are aligned so as to line up on the four sides S1 to S4 of the virtual quadrilateral S (the virtual square in this example) S.

  Specifically, ten cooling fins 32A having a short length (apart from the attachment surface 30A (see, in particular, FIG. 5) so that the tips are aligned on the side S1 parallel to the attachment surface 30A of the terminal box 30. Also, 10 cooling fins 32B and 32D are arranged so that the tips are aligned with two sides S2 and S4 perpendicular to the attachment surface 30A, respectively, and the tips are on the opposite side S3 parallel to the attachment surface 30A. 10 cooling fins 32C are provided so that the spaces P1 to P4 can be secured in the vicinity of the vertices of the virtual quadrangle S by arranging the cooling fins 32A to 32D.

  In this embodiment, the load-side cover 16 and the anti-load-side cover 18 are each provided with four load-side seat portions 22 and four anti-load-side seat portions 24 at positions corresponding to the spaces P1 to P4. Reference numerals 14A and 14B in FIGS. 5 and 6 are receiving seats (for reinforcement at the time of tightening through bolts) provided on the frame main body 14, and include a load side seat portion 22 and an anti-load side seat portion 24. Is different.

  The frame main body 14, the load side cover 16 and the anti-load side cover 18 are connected by one (four in total) through bolts 26 through the load side seat portion 22 and the anti-load side seat portion 24. As a result, the built-up portion 28 is also located in the vicinity of the vertex of the virtual quadrangle S.

  In the embodiment, the tips of all the fins are aligned on the side of the virtual quadrangle (square) S. However, the tips of some fins may be inside the sides of the virtual quadrangle. In other words, it can be expressed as the largest virtual quadrangular among the virtual quadrangles with which the tips of the fins are in contact.

  As is clear from each figure (particularly FIG. 6), no built-up portion is formed between the cooling fins 32A to 32D. The cooling fins 32A1, 32B1, 32C1, and 32D1 at both ends of the cooling fins 32A to 32D of each side S1 to S4 are integrated with the adjacent built-up portion 28. The configuration of the build-up portion 28 will be described in detail later.

  The load side cover 16 also serves as a side cover of the reduction gear G1 and is provided on the side of the frame body 14 on the axial load side. As described above, the load-side cover 16 is configured so that the load-side seat portion 22 used when the through-bolt 26 is fastened is positioned at a position corresponding to the build-up portion 28 in the circumferential direction (a space near the vertex of the virtual quadrangle S). P1 to P4) are provided with a total of four. Each load side seat portion 22 is formed with a tap hole 22A into which the through bolt 26 is screwed. The load side cover 16 is integrated with the casing 17 of the reduction gear G1 via a bolt (not shown).

  The anti-load side cover 18 is provided on the side portion of the frame body 14 on the anti-load side in the axial direction. The anti-load side cover 18 also has the anti-load side seat portion 24 used when fastening the through-bolts 26 at positions corresponding to the build-up portion 28 in the circumferential direction (spaces P1 to P4 in the vicinity of the apex of the virtual quadrangle S). 4 in total. Each anti-load side seat portion 24 is formed with a through-hole 24A through which the through bolt 26 penetrates (not a tap hole). The anti-load side cover 18 has an opening (not shown) at the center in the radial direction, and the cooling fan 19 is connected to the output shaft (not shown) of the motor M1 through the opening. Reference numeral 25 denotes a fan cover.

  In this embodiment, four through bolts 26 are used. The head 26 </ b> A of each through bolt 26 is in contact with the anti-load side seat portion 24 of the anti-load side cover 18. Further, the through-bolt 26 passes through a through-hole 24A of the anti-load side seat portion 24 and a later-described through-hole 28A of the build-up portion 28 of the frame body 14, and the tip thereof is a load-side seat of the load-side cover 16. Screwed into the tapped hole 22A of the portion 22. As a result, the frame body 14, the load side cover 16, and the anti-load side cover 18 are connected by the single through bolt 26 via the load-side seat portion 22 and the anti-load side seat portion 24.

  Here, the configuration around the built-up portion 28 will be described. All of the four built-up portions 28 have basically the same structure. In this embodiment, leg members 60 for mounting the motor M1 on the floor or a frame (not shown) of the apparatus and suspension bolts 70 for lifting the motor M1 are prepared as separate members attached to the build-up portion 28. . Each build-up part 28 corresponds to both attachment of the leg part 60 and attachment of the suspension bolt 70.

  In each figure, two legs 60 and suspension bolts 70 are shown, one of which is indicated by a solid line, and the other one indicated by an imaginary line is about to be attached. Each state is shown.

  Each build-up portion 28 is formed with a through hole 28A through which the through bolt 26 is inserted in the axial direction. Further, as shown in FIG. 6, each build-up portion 28 includes an attachment surface 28 </ b> A parallel to the two sides S <b> 1 and S <b> 3 of the virtual quadrangle S and an attachment surface 28 </ b> B parallel to the two sides S <b> 2 and S <b> 4 of the virtual quadrangle S. Each is equipped. A chamfer 28C of 45 degrees is formed at the top where the two attachment surfaces 28A and 28B intersect. The facing distance L2 and the diagonal distance L4 of the attachment surfaces 28A and 28B of each build-up portion 28 are both smaller than the length L3 of the sides S1 to S4 of the virtual quadrangle S and the diagonal length L5, The build-up portion 28 is sized to fit within the virtual rectangle S.

  Two countersink portions (engaged portions) 52 are formed on each attachment surface 28A, 28B. That is, a total of four counterbore parts 52 are formed for each of the built-up parts 28, and a total of 16 parts are formed for the entire frame. A tap hole (internal thread) 54 is formed at the center of each counterbore 52.

  When attaching the leg part 60 prepared as another member to the build-up part 28, two legs formed on one attachment surface 28A (or 28B) of the build-up part 28 with respect to one leg part 60. The counterbore 52 is used. In the case of the present embodiment, two protrusions (engaging portions) 62 corresponding to the two countersink portions 52 of the built-up portion 28 are formed in the leg portion 60 in advance. In addition, a through-hole 64 is formed in the center of each protrusion 62 so that the axial center of the tap hole 54 on the side of the built-up portion 28 coincides (see FIG. 4 in particular).

  Moreover, when attaching the suspension bolt 70 prepared as another member to the build-up part 28, one counterbore part 52 is used with respect to one suspension bolt 70 (When attaching a pair of suspension bolts 70, it is different. Using the counterbore 52 of the raised portion 28). Therefore, the suspension bolt 70 has a large-diameter portion (engagement portion) 72 corresponding to the countersink portion (engaged portion) 52 of the build-up portion 28 and a screw portion 74 that is screwed into the tap hole 54. ing.

  In this embodiment, the speed reducer G1 connected to the motor M1 is a speed reducer provided with a planetary gear speed reduction mechanism (not shown) called a swinging intermeshing engagement type. The reduction gear G1 includes an input shaft (not shown) connected to an output shaft (not shown) of the motor M1, and outputs a reduced rotation from an output shaft 57 coaxial with the input shaft.

  The outline L1 of the reduction gear is larger than the outline L2 of the built-up portion 28 of the frame body 14 of the motor M1 (which is naturally larger than the diagonal distance L4). In other words, the built-up portion 28 is within the projection plane when the reduction gear G1 is viewed from the axial direction. Furthermore, the outer shape L1 of the reduction gear G1 is larger than the diagonal distance L4 of the apex portion of the virtual quadrangle S. That is, the outer shape of the speed reducer G1 is larger than the dimension of the outermost portion of the cooling fin 32, and the cooling air of the cooling fan 19 flowing along the cooling fin 32 of the frame body 14 is connected to the speed reducer G1. By striking against the load side cover 22, the casing 17 of the speed reducer G1 can also be cooled together.

  Next, the operation of the gear motor GM1 will be described.

  When the power source of the motor M1 is turned on and the motor M1 is in an operating state, the cooling fan 19 connected to the output shaft of the motor M1 rotates and blows the cooling air toward the cooling fins 32 of the frame body 14. In the frame structure of the present embodiment, the built-up portions 28 are formed at four locations, but all of them are disposed between the load side seat portion 22 and the anti-load side seat portion 24, and originally the build-up portion. Even in the prior art where there was no cooling, the cooling at this portion could hardly be expected. In particular, in this embodiment, since the built-up portion 28 is accommodated inside the virtual quadrangle S, almost no new problems occur with respect to the cooling between the load side seat portion 22 and the anti-load side seat portion 24.

  On the other hand, conventionally, since the build-up portion was formed between the cooling fins (avoid the position of the through bolt), the flow of the cooling air was significantly hindered and the cooling efficiency was lowered. However, in this embodiment, since no build-up part is formed between the cooling fins 32, the flow of the cooling air is not hindered. Therefore, as a result, it is possible to perform cooling that is much more efficient than in the past. Further, the cooling air flowing along the cooling fin 32 is a casing of the reduction gear G1 having an outer shape L1 larger than the maximum outer shape of the cooling fin 32 (that is, the diagonal distance L4 of the sides S1 to S4 of the virtual quadrangle S). Since it abuts against the load side cover 22 connected to the casing 17, the casing 17 of the reduction gear G1 can also be efficiently cooled.

  The advantage of high cooling efficiency may literally be enjoyed as “improving the cooling performance”, but if it is sufficient to obtain the same cooling performance as before, this advantage can be achieved by, for example, cooling fins. By reducing the height, the entire frame may be further reduced in size and weight.

  On the other hand, when attaching the leg part 60 to the build-up part 28, the protrusion of the leg part 60 on the countersink part (engaged part) 52 of the attachment surface 28A (or 28B) of the build-up part 28 to be attached. When the portion (engagement portion) 62 is engaged, the leg 60 is automatically positioned with respect to the mounting surface 28A of the build-up portion 28, and the axis of the tap hole 54 of the build-up portion 28 and the leg 60 The axial centers of the through holes 64 coincide. Therefore, the mounting of the leg portion 60 can be completed by screwing a bolt (not shown) into the tap hole 54 from the back side of the leg portion 60 through the through hole 64.

  Further, when the suspension bolt 70 is attached to the build-up portion 28, the tap hole 54 in the center of the countersunk portion (engaged portion) 52 of the attachment surface 28A (or 28B) of the build-up portion 28 to be attached is attached. When the threaded portion 74 of the suspension bolt 70 is screwed together, the large-diameter portion 72 of the suspension bolt 70 eventually engages with the counterbore portion 52 of the attachment surface 28A, and the suspension bolt 70 is attached to the attachment surface 28A. Can be installed vertically and firmly.

  Since the engagement portions such as the counterbore (engaged portion) 52, the protrusion 62, and the large diameter portion 72 can be machined in advance, high-precision attachment is possible.

  The built-up portions 28 are formed at four positions in the spaces P1 to P4 near the vertices of the virtual quadrangle S, and each of the built-up portions 28 has two countersink portions 52 formed in a right angle direction. A total of four pieces are formed, and both the leg portion 60 and the suspension bolt 70 can be handled with the same structure (because of compatibility). For example, for the reduction gear G1 Alternatively, it is possible to very flexibly attach the leg portion 60 and the suspension bolt 70 to the position of the terminal box 30.

  In the above-described embodiment, the protruding direction of the cooling fin is protruded so as to be orthogonal to each other by two surfaces. However, in the present invention, the protruding direction of the cooling fin is not particularly limited, and for example, protrudes in the radial direction. It may be what was done.

  Further, in the above-described embodiment, the build-up portion is arranged to be inside the virtual quadrangle where the tip of the cooling fin contacts in the cross section perpendicular to the axis of the frame body. The effect of can be obtained.

  Moreover, in the said embodiment, although the example in which this invention was applied to the gear motor with which the motor was integrated with the reduction gear was shown, the motor which concerns on this invention is not necessarily in the state integrated with the reduction gear. For example, the present invention can be applied to a combination with a speed reducer having a casing independent of the motor frame.

  Moreover, in the said embodiment, while forming 4 build-up parts, it was trying to form the to-be-engaged part or bolt hole for attaching another member to each build-up part, In this invention, In addition, the number of the engaged portions and the number of bolt holes that form the build-up portions are not particularly limited. Further, a plurality of types of separate members can be attached to the built-up portion of the same structure, but in the present invention, the built-up portion itself, the engaged portion and the bolt hole are separately provided for each of the attached separate members. You may make it form. The shapes of the engaged portion and the engaging portion on the side of another member that engages with the engaged portion are not limited to the above configuration, and for example, the relationship between convex and concave may be reversed. The shape of the engaged portion is not necessarily a circle.

  Furthermore, in the present invention, such an engaged portion does not necessarily have to be formed in the build-up portion. For example, only bolt holes may be formed (without engaged parts), or the engaged parts and bolt holes may be post-processed when a request for attachment occurs. Also good. The same applies to the corresponding engaging portion of the other member.

M1 ... Motor 12 ... Frame 14 ... Frame body 16 ... Load side cover 18 ... Non load side cover 19 ... Cooling fan 22 ... Load side seat 24 ... Non load side seat 26 ... Through bolt 28 ... Building part 30 ... Terminal Box 32 ... Cooling fin 60 ... Leg 70 ... Hanging bolt S ... Virtual quadrangle

Claims (7)

In the frame structure of the motor with the load side cover and the anti-load side cover across the frame body,
The load-side cover and the anti-load-side cover each include a seat portion for fastening a through bolt,
The frame main body, the load side cover, and the anti-load side cover are connected by the one through bolt through the seat portion,
The frame main body has a built-in portion for attaching another member to the frame main body between the seat portions; and
The build-up portion has a through-hole for inserting the through-bolt. A motor frame structure, wherein: In claim 1,
The frame body has cooling fins, and at least some of the tips of the cooling fins are configured to contact sides of a virtual rectangle in a cross section perpendicular to the axis of the frame body.
The frame structure of the motor, wherein the build-up portion is formed so as to fit inside each side of the virtual quadrangle. In claim 1 or 2,
The motor is a gear motor used in connection with a reduction gear;
The motor frame structure, wherein the build-up portion is within a projection plane when an outer shape of the speed reducer is viewed from an axial direction. In any one of Claims 1-3,
An engaged portion for positioning the separate member is formed in the build-up portion. A motor frame structure, wherein: In claim 4,
As one of the separate members, a leg for installing the motor on a floor or an equipment frame is prepared,
An engaging portion corresponding to the engaged portion is formed on the leg portion. A motor frame structure, wherein: In claim 4 or 5,
As one of the separate members, a suspension bolt for lifting the motor is prepared,
An engagement portion corresponding to the engaged portion is formed on the suspension bolt. A motor frame structure, wherein: In any one of Claims 1-6,
A frame structure of a motor, wherein a plurality of bolt holes for attaching the separate member are formed in the build-up portion.

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