JP2013150395A - Gear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a speed reducer of a gear motor.SOLUTION: In a gear motor GM1, a speed reducer G1 is connected with a motor M1. The gear motor GM1 includes a joint cover 24 between the speed reducer G1 and the motor M1. The joint cover 24 has an attachment flange 24A, formed in a radial direction, at an end part of the speed reducer G1 side. In the attachment flange 24A, a notch 40 (or a through hole) is formed in an area excluding a portion where a fixing member 36 for fixing the attachment flange 24A to the speed reducer G1 side is disposed.

Description

  The present invention relates to a gear motor.

  Patent Document 1 discloses a gear motor in which a motor and a speed reducer are connected. Between the motor and the speed reducer, a joint cover serving as both a load side cover of the motor and an anti-load side cover of the speed reducer is provided, and the motor and the speed reducer are connected via this joint cover.

  A cooling fan is provided on the opposite side of the motor of the gear motor. Fins are provided on the outer circumference of the casing of the motor, and the motor is cooled by cooling air sent from a cooling fan.

Japanese Patent Laid-Open No. 10-285869

  Since the motor casing is provided with fins, the cooling air generated by the cooling fan cools the motor casing while moving toward the reduction gear along the fins.

  However, in the configuration disclosed in Patent Document 1, the joint cover connecting the motor and the speed reducer closes the end surface of the speed reducer on the motor side. The fact is that it was mostly used only for cooling the motor and hardly contributed to the cooling of the reduction gear.

  This invention is made | formed in view of such a conventional situation, Comprising: The subject is providing the gearmotor which can cool a reduction gear more effectively.

  The present invention is a gear motor in which a speed reducer and a motor are connected, and includes a joint cover between the speed reducer and the motor, and the joint cover is formed in a radial direction at an end portion on the speed reducer side. The mounting flange has a configuration in which a notch or a through hole is formed in a portion other than a portion where a fixing member for fixing the mounting flange to the speed reducer side is disposed. Thus, the above-described problems are solved.

  An attachment flange for fixing the joint cover to the speed reducer side is formed at an end of the gear motor joint cover on the speed reducer side. In the present invention, a notch or a through hole is formed in a portion of the mounting flange other than a portion where a fixing member (for example, a bolt or the like) that connects the mounting flange and the casing of the reduction gear is disposed.

  Therefore, the cooling air can reach the casing side of the reducer directly (despite the presence of a joint cover between the motor and the reducer), effectively cooling the reducer. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, the reduction gear of a gear motor can be cooled more effectively.

The front view which shows the structure of the gear motor which concerns on an example of embodiment of this invention. Sectional view along the line II-II in FIG. The front view which shows the structure of the gear motor which concerns on an example of other embodiment of this invention. Sectional view along line IV-IV in FIG. The front view which shows the structure of the gear motor which concerns on an example of further another embodiment of this invention. Sectional view along line VI-VI in FIG. Sectional view along line VII-VII in FIG. The fragmentary sectional view which shows the modification about formation of the notch or through-hole of this invention

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing a configuration of a gear motor according to an example of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  The gear motor GM1 is obtained by integrally connecting a motor M1 and a reduction gear G1. In this embodiment, a high-efficiency (premium efficiency) motor conforming to the so-called IE3 standard is employed as the motor M1.

  The IE3 standard is one of efficiency classes based on a calculation method issued in 2007 by IEC (International Electrotechnical Commission) 60034-2-1 for motors rotating at a constant speed in recent years. Here, the efficiency class is a classification of efficiency reference values by class. From the highest efficiency, IE4 (super premium efficiency), IE3 (premium efficiency), IE2 (high efficiency), and IE1 (standard efficiency) are specified. ing.

  In general, in order to increase the efficiency of a motor, for example, (1) a motor using a magnet such as IPM or SPM is used; (2) a material (material) of a constituent member such as a core or a winding is changed; It is known that techniques such as (1) changing the coil winding thickness and winding method (slot shape), and (4) keeping the flowing current small are effective.

  Regardless of which method is used, the higher the efficiency is from IE1 to IE2, IE2 to IE3, etc., the more the generated heat tends to decrease in obtaining the same output. In this embodiment, the motor M1 of the IE3 standard with a low calorific value is adopted as the motor, so that the temperature of the cooling air reaching the reduction gear G1 is kept as low as possible, and the present invention functions as effectively as possible. I have to.

  Returning to the description of the structure of the gear motor GM1.

  A cooling fan 14 is fixed via a key 12 on the opposite side of the motor shaft 10 of the motor M1. The cooling fan 14 is housed in a fan cover 16 having an opening 16A through which air can pass. An opening 16B communicating with the outer peripheral side of the casing 20 of the motor M1 is formed at the load side end of the fan cover 16.

  The casing 20 of the motor M1 includes a cylindrical motor casing body 22, a load side cover (not shown) that closes the non-load side of the motor casing body 22, and a joint cover 24 that closes the load side of the motor casing body 22. It is mainly composed of a single casing member. A plurality of fins 26 are projected and formed on the outer periphery of the motor casing body 22 in parallel with the motor shaft 10 (in FIG. 1, only two formed in the vertical direction of FIG. 1 are shown).

  The air sucked from the opening 16 </ b> A of the fan cover 16 by the cooling fan 14 is blown out as cooling air from the load-side opening 16 </ b> B toward the outer periphery of the motor casing body 22, and the fins 26 formed to protrude from the motor casing body 22 The casing 20 of the motor M <b> 1 is cooled via the speed reducer G <b> 1 side while being cooled.

  On the other hand, the casing 30 of the speed reducer G1 includes a cylindrical speed reducer casing body 32, the joint cover 24 that closes the opening on the opposite side of the speed reducer casing body 32, and the load side opening of the speed reducer casing body 32. It is comprised by the three casing members of the load side cover 34 which obstruct | occludes. That is, the joint cover 24 interposed between the motor M1 and the speed reducer G1 constitutes a load side cover of the motor M1 and also constitutes (also serves as) an antiload side cover of the speed reducer G1.

  The outer diameter d1 of the reduction gear casing main body 32 is larger than the outer diameter d2 of the motor casing main body 22. Therefore, the joint cover 24 has a mounting flange 24A formed in the radial direction at the end on the reduction gear G1 side. The joint cover 24 is connected to the reduction gear casing main body 32 at the portion of the mounting flange 24A, and is connected to the motor casing main body 22 at a portion radially inward of the mounting flange 24A.

  In the present embodiment, the portion of the attachment flange 24 </ b> A of the joint cover 24 and the reduction gear casing main body 32 are connected by a through bolt (fixing member) 36. Six through bolts 36 (36A to 36F) are arranged, penetrate the joint cover 24, the reduction gear casing main body 32, and the load side cover 34, and fasten the three members 24, 32, 34 together. The connection between the joint cover 24 and the motor M1 side is performed using a mounting hole 41 (41A to 41D) with a bolt (not shown). As a result, the motor M1 and the reduction gear G1 are connected via the joint cover 24.

  Here, the joint cover 24 has six cutouts 40 formed in a portion other than the portion where the six through bolts (fixing members) 36 (36A to 36F) are arranged in the mounting flange 24A (40A). ~ 40F). 2 corresponds to the end face 32A of the speed reducer casing main body 32 that is exposed when viewed from the motor M1 side by forming the cutout 40. That is, the arc portion 40X on the innermost peripheral side of the hatched portion corresponds to the outer peripheral portion of the mounting flange 24A. In this embodiment, the outer diameter (that is, the innermost diameter of the notch 40) r1 of the arc portion 40X is equal to the pitch circle diameter r1 of the through bolt 36, and the periphery of the through bolt 36 of the mounting flange 24A (the fixing member is Only the portion (placed) is left outside (not cut out) from the pitch circle diameter r1 so as to surround the through bolt 36.

  Since six through bolts 36 are arranged in this embodiment, six notches 40 are formed, but the number of fixing members and the number of notches do not necessarily need to match (the number of fixing members). The number of notches may be smaller or larger). However, it is preferable to match the number of through bolts and the number of notches as in this embodiment because the cooling air passage can be secured most. That is, when the number of through bolts is 12, for example, it is preferable to form 12 notches.

  In this embodiment, liquid packing (not shown) is applied between the joint cover 24 and the reduction gear casing body 32 in order to enhance the sealing effect of the lubricant in the reduction gear G1. However, liquid packing is not applied between the reduction gear casing main body 32 and the load side cover 34 (between the casing members of the reduction gear G1).

  Reference numeral 42 denotes an eyebolt, and 44 denotes an output shaft of the reduction gear G1.

  Next, the operation of the gear motor GM1 according to this embodiment will be described.

  When the motor shaft 10 of the motor M1 rotates, the cooling fan 14 connected to the motor shaft 10 rotates, and air flows into the fan cover 16. The air that has flowed in is blown out as cooling air from the opening 16B on the load side of the fan cover 16 to the outer periphery of the casing 20 of the motor M1, passes between the fins 26, and exchanges heat with the motor casing body 22 via the fins 26. To the splice cover 24.

  Here, before explaining the specific operation of the present embodiment, in order to facilitate understanding, the operation of the conventional gear motor (GMo) will be briefly described with reference to FIG. In the conventional joint cover (24), the mounting flange (24A) of the joint cover (24) for fixing to the casing (30) of the speed reducer (Go) is substantially the same diameter as the outer shape of the speed reducer casing body (32). It was said to be "round". This configuration is formed by the mounting flange (24A) itself projecting radially at the end of the joint cover (24) for the purpose of "constituting a surface fixed to the speed reducer (Go) side". Judging from what was done, it was a very natural composition. However, the end face of the speed reducer (Go) is therefore covered by the mounting flange (24A) of the joint cover (24), and the cooling air generated by the cooling fan (14) of the motor (M1) It hit (24A) and dissipated radially outward, and it did not hit the reducer casing body (32) directly. In other words, in the conventional structure, most of the cooling air from the cooling fan (14) is dissipated into the air unnecessarily without contributing to the cooling of the reduction gear (Go).

  In particular, in many gear motors (GMo) (as applied in this embodiment), the sealing effect of the lubricant is enhanced between the joint cover (24) and the reduction gear casing body (32). For this purpose, liquid packing is applied. Since the liquid packing has an extremely low thermal conductivity compared to metal, the reduction gear casing main body (32) can be connected to the joint cover (24) even when the temperature of the joint cover (24) is lowered due to cooling air. Heat exchange between the two. As a result, the cooling air from the cooling fan 14 actually hardly contributed to the cooling of the reduction gear Go.

  However, in the present embodiment, the portion other than the portion where the through bolt 36 that fixes the mounting flange 24A and the reduction gear G1 side (the reduction gear casing main body 32) is disposed (other than the portion where the fixing member is disposed). (Notch 40) formed by cutting the outer side in the radial direction from the pitch circle diameter r1 of the through bolt 36. That is, the end surface 32A of the reduction gear casing main body 32 is exposed at a portion corresponding to the “notch 40” (shaded portion in FIG. 2). Therefore, the cooling air can directly cool the reduction gear casing main body 32.

  In this embodiment, since no liquid packing is applied between the casing members of the reduction gear G1, that is, between the reduction gear casing main body 32 and the load side cover 34, the reduction gear casing main body 32 and the load side cover are not applied. 34 is in metal contact and has high thermal conductivity. Therefore, the reduction gear casing main body 32 is cooled by the cooling air, so that the entire casing 30 of the reduction gear G1 including the load side cover 34 can be effectively cooled.

  In addition, in the present embodiment, since the motor M1 of the IE3 standard is adopted as the motor, the amount of heat generated by the motor M1 itself is small, and therefore the cooling air generated by the cooling fan 14 has a small temperature rise. Thus, the reduction gear casing main body 32 can be efficiently cooled through the notch 40 of the mounting flange 24A.

  Various variations are conceivable for the present invention.

  In the above embodiment, the cutout 40 is only formed in the attachment flange 24A portion of the joint cover 24. However, in the embodiment of FIGS. 3 and 4, in addition to the joint cover 24 having the same configuration, the speed reducer The reduction gear casing main body 52 of the G2 casing 50 is also formed with notches 54 (54A to 54F) at positions corresponding to the notches 40 of the joint cover 24. That is, as apparent from the depiction of FIG. 4 which is a cross-sectional view taken along the line IV-IV in FIG. 3, in this embodiment, the mounting flange 24 </ b> A in the previous embodiment is also applied to the reduction gear casing main body 52. A notch 54 (54A to 54F) having the same shape as the notch 40 is formed at a position corresponding to the notch 40. In addition, the codes | symbols 36Ap-36Fp of FIG.

  According to this embodiment, the cooling air flowing from the motor M1 side can flow along the outer periphery of the speed reducer casing main body 52 as it is, exceeding the notch 40 of the joint cover 24. And if the cooling wind which flowed along the outer periphery of the reduction gear casing main body 52 collides with the load side cover 34 of the reduction gear G2, the last heat exchange will be performed here and it will be dissipated radially outside. In the case of this embodiment, since the cooling air reaches the load side cover 34 of the reduction gear G2 directly, even if liquid packing is applied between the reduction gear casing body 52 and the load side cover 34, The cooling characteristics do not deteriorate.

  According to this embodiment, cooling of the casing 50 of the speed reducer G2 can be further promoted as compared with the previous embodiment because the cooling air can reach the load side cover 34 through the outer periphery of the speed reducer casing main body 52. it can.

  In this embodiment, the load side cover 34 of the reduction gear G2 is not formed with a notch, and the cooling air is received by the load side cover 34. Cutouts (not shown) of the same shape may be formed, and each cutout may be configured to penetrate the entire casing 50 of the reduction gear G2. As a result, the cooling air is blown through to the load side as it is along the outer periphery of the casing 50 of the reduction gear G2. Depending on the environment around the reduction gear G2, etc., it may be possible to perform heat exchange more efficiently by adopting such a “structure that blows through”.

  5 to 7 show an example of still another embodiment of the present invention.

  In this embodiment, the joint cover 64 of the casing 58 of the reduction gear G3, the reduction gear casing main body 66, and the load side cover 68 are penetrated with the same phase (not the notch) (the same circumferential position) and the same diameter D1. Holes 70, 72, and 74 are formed, respectively.

  More specifically, in this embodiment, a through bolt (fixing member) 36 for fixing the mounting flange 64A to the reduction gear casing main body 66 is disposed on the mounting flange 64A of the joint cover 64. A total of 18 through-holes 70 (70A to 70R) having a diameter D1 are formed in three portions each other than the portion (between the six through bolts 36).

  And the through-hole 72 (72A-72R) of the same diameter D1 is formed in the position (same position of the circumferential direction) corresponding to this through-hole 70 in the reduction gear casing main body 66, and also the load of the reduction gear G3 In the side cover 68, through holes 74 (74A to 74R) having the same diameter D1 are formed at positions corresponding to the through holes 70 (same positions in the circumferential direction).

  That is, each through-hole 70, 72, 74 penetrates the casing 58 of the reduction gear G3 in the axial direction as a whole. In the case of this configuration, the cooling air sent from the cooling fan 14 passes through the through hole 70 of the attachment flange 64 </ b> A of the joint cover 64, the through hole 72 of the reduction gear casing main body 66, and the through hole 74 of the load side cover 68. At this time, the heat is exchanged with the casing 58 of the reduction gear G3, and then blows out from the load side of the reduction gear G3. In this configuration, since the entire inner peripheral surface of the through holes 70, 72, 74 can be used as a “surface for heat exchange”, a large “surface for heat exchange” can be secured. , Efficient heat exchange can be performed. In particular, as in this embodiment, when a large number of through holes 70, 72, 74 are formed (in this example, three between each through bolt 36, a total of 18), all the through holes 70, 72, It is possible to secure a large “surface for heat exchange” by 74. On the other hand, there is little decrease in strength.

  Further, the structure in which the through holes 70, 72, and 74 are formed is often easier to manufacture than the structure in which the notch 40 is formed, and can be manufactured at low cost. In addition, when forming a through-hole, it is preferable to set it as the through-hole which penetrates all of a joint cover, the casing main body of a reduction gear, and a load side cover like this embodiment. Thereby, it can prevent that the warm air stays in the casing of a reduction gear.

  In addition, when forming the notch and through-hole which concern on this invention, as shown to (A)-(C) of FIG. 8, for example, it goes from the center of a reduction gear toward the load side of a reduction gear. You may make it form so that the formation diameter (distance) of may become large.

  8A is formed when the notches 88, 90, and 92 are formed in the attachment flange 82A of the joint cover 82 of the casing 80 of the reduction gear G4, the reduction gear casing main body 84, and the load side cover 86. The formation depths H1 to H2 of the notches 88, 90 and 92 are continuously made shallower toward the load side of the reduction gear G4 (H2 <H1), and as a result, the formation diameter r11 from the center O1 of the reduction gear G4. → r12 increases continuously toward the load side of the reduction gear G4 (r12> r11). Thereby, when the cooling air passes along the notches 88, 90, and 92, an appropriate resistance can be given, and heat exchange between the cooling air and the casing 80 of the reduction gear G4 can be further promoted. .

  8B is formed when the through holes 104, 106, 108 are formed in the attachment flange 98A of the joint cover 98 of the casing 96 of the reduction gear G5, the reduction gear casing main body 100, and the load side cover 102. The pitch circle diameter (formation diameter) r21 → r22 of each through hole 104, 106, 108 is formed so as to increase continuously toward the load side of the reduction gear G5 (r21 <r22). Also with this configuration, an appropriate resistance can be given to the passage of the cooling air through the through holes 104, 106, and 108, and heat exchange in the through holes 104, 106, and 108 can be further promoted. it can.

  8 (C) is a modification of FIG. 8 (B), in which the attachment flange 112A of the joint cover 112 of the casing 110 of the reduction gear G6, the reduction gear casing main body 114, and the load side cover 116 are provided. In forming the through holes 118, 120, and 122, the pitch circle diameter r 31 of the through hole 118 of the joint cover 112, the pitch circle diameter r 32 of the through hole 120 of the speed reducer casing body 114, and the pitch of the through hole 122 of the load side cover 116. The circular diameter r33 is formed so as to increase stepwise (r33> r32> r31) toward the load side of the reduction gear G6. In this configuration, the through holes 118, 120, and 122 are easily formed, and are generated between the joint cover 112 and the speed reducer casing main body 114, and between the speed reducer casing main body 114 and the load side cover 116. Heat exchange can be promoted by the cooling air striking against the steps 124 and 126 that are present.

  Although not shown in the drawings, the configuration in which the formation diameter is increased step by step for each of the joint cover, the reduction gear casing main body, and the load side cover is provided when a “notch” as shown in FIG. 8A is formed. Is also applicable.

  In the above-described embodiment, an example in which only one of the notch and the through hole is employed is shown. However, the notch and the through hole may be used in combination.

  For example, the notch (40) is formed in the manner shown in FIG. 2 for the joint cover, and the through-holes (72, 74) are made in the manner shown in FIG. 7 for the reducer casing body and the load side cover. ) May be formed. Thus, through holes (72, 74) formed in the reduction gear casing main body and the load side cover while actively applying cooling air to the end portion of the reduction gear casing main body via the notch (40). Through this, further heat exchange can be performed.

  As another example in which the notch and the through hole are used in combination, for example, the configuration as shown in FIG. 8C is used as a base. 120), only the load side cover may be configured as a U-shaped notch that opens radially outward instead of the through hole (122). Furthermore, in one member (for example, a joint cover), a notch and a (through) hole may be used together, or a notch or (through) hole having a different shape or size may be provided. Good. The hole of the casing of the reduction gear may not penetrate.

  Thus, in the present invention, it is important to form and secure a “passage” so that the cooling air from the motor side can directly touch the casing of the speed reducer. Whether it is constituted by a notch or a through hole may be appropriately selected.

  Further, as already illustrated in FIG. 8C, the notch or (through) hole formed in the casing of the speed reducer does not necessarily correspond to the notch or through hole of the mounting flange. You don't have to.

  That is, the notch or (through hole) formed in the casing of the speed reducer is "corresponding" in a manner in which the notch or through hole formed in the mounting flange is shifted by a predetermined amount in the radial direction or the circumferential direction. It may be a thing. In this sense, the concept of “corresponding position” in a configuration in which “a notch or (through) hole is formed in a position corresponding to the notch or through hole of the mounting flange in the casing of the speed reducer”. In addition to the concept of a narrow sense corresponding to the position where both the circumferential position and the radial position are completely coincident, at least one of the circumferential position and the radial position is intentionally shifted by a predetermined amount. It includes a broad concept that corresponds by location. However, in any case, it is necessary to make correspondence so that at least a part is “communication” so as to function as a “passage”.

  In the above embodiment, a sealing member such as a liquid packing for sealing the lubricant is disposed between the joint cover and the speed reducer casing body or between the speed reducer casing body and the load side cover. It had been. The present invention certainly functions most effectively when the sealing member is disposed between the members as described above, but the present invention shows that the sealing member is disposed between the members. This is not a requirement, and functions effectively even when a sealing member is not disposed in part or all between the members.

M1 ... Motor G1 ... Speed reducer 14 ... Cooling fan 20 ... Motor casing 22 ... Motor casing body 24 ... Joint cover 24A ... Mounting flange 30 ... Speed reducer casing 32 ... Speed reducer casing body 34 ... Load side cover 36 ... Through bolt 40 ... Notch

Claims (5)

A gear motor in which a reduction gear and a motor are connected,
A joint cover is provided between the speed reducer and the motor;
The joint cover has a mounting flange formed in a radial direction at an end portion on the speed reducer side,
The mounting motor has a notch or a through hole formed in a portion other than a portion where a fixing member for fixing the mounting flange to the speed reducer is disposed. In claim 1,
The gear motor is characterized in that a cutout or a hole is formed in the casing of the speed reducer at a position corresponding to the cutout or the through hole of the mounting flange. In claim 2,
A notch or a hole formed in the casing of the speed reducer passes through the casing in the axial direction. In any one of Claims 1-3,
A gear motor, wherein a sealing member is disposed between at least one surface between the joint cover and a casing body of the speed reducer and between members constituting the casing of the speed reducer. In any one of Claims 1-4,
The notch or hole formed in the casing of the speed reducer has a distance from the center of the speed reducer that increases toward the load side of the speed reducer.

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