JP5259808B2 - Reducer with waterproof motor - Google Patents

Description

  The present invention relates to a reduction gear with a motor that is used as a drive source for an elevating device installed outdoors, and more specifically, rainwater or the like is prevented from entering the inside through a gap between a motor housing and a cable. The present invention relates to a reduction gear with a waterproof motor.

  For example, in a reduction gear 10 with a motor as shown in FIG. 1 used as a drive source for an elevating device installed outdoors, the cable 12 is inserted when the cable 12 is pulled out from the inside of the motor housing 14. Therefore, a sealing structure for preventing rainwater or the like from entering the inside of the motor housing 14 from the through hole 16 provided in the motor housing 14 is required. FIG. 6 is a cross-sectional view showing an example of this type of sealing structure. FIG. 6A is a developed cross-sectional view of the parts constituting the sealed structure, and FIG. 6B is a cross-sectional view of the assembled parts constituting the sealed structure.

  In this sealed structure, a through hole 66 is formed in the motor housing 64 so as to pass through the inner line 62 a wrapped in the outer skin 62 b of the cable 62, and the side surface 66 a has a diameter toward the inner side of the motor housing 64. The insertion hole 66c through which the extension line 62a of the cable 62 is inserted is formed in the bottom surface 66b. An elastic bracket 65 surrounding the extension 62 a of the cable 62 is inserted into the through hole 66. The elastic body bracket 65 has a side surface 65 a whose diameter decreases toward the inner side of the motor housing 64 so as to be fitted to the through hole 66, and a flange portion 65 b that contacts the outer surface of the motor housing 64. Have. A cable fixing plate 63 for pressing the side surface 65a of the elastic body bracket 65 to the side surface 66a of the through hole 66 and the flange portion 65a of the elastic body bracket 65 to the outer surface of the motor housing 64 is provided. The elastic bracket 65 is sandwiched between the fixing plate 63 and the motor housing 64, and the cable fixing plate 63 is screwed into the screw hole 67 screwed into the motor housing 64 with the fixing bolt 61, whereby the cable 62 and the motor housing 64 are fixed. (See, for example, Patent Document 1).

JP 2005-45904 A

  However, the above-described sealed structure has a problem in that stress is applied to the elastic body bracket 65 from the side surface 66a and the bottom surface 66b of the through hole 66, and the elastic body bracket 65 deteriorates early. Further, there is a problem that the flange portion 65a of the elastic body bracket 65 is damaged by overtightening the fixing bolt 61.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof motor-equipped speed reducer having a sealed structure in which a double seal structure is formed and the sealed state is maintained for a long time.

The invention according to claim 1 is provided with a waterproof structure in which a through hole through which a cable is inserted is drilled in the motor housing and water is prevented from entering the inside of the motor housing through a gap between the through hole and the cable. In the speed reducer with a type motor, the elastic body bracket that surrounds the cable and is inserted into the through hole has a flange portion that contacts the outer surface of the motor housing, and is inserted into the through hole of the elastic body bracket The portion has a conical shape whose diameter decreases toward the inner side of the motor housing, and the maximum diameter of the conical portion of the elastic bracket is larger than the diameter of the outer end portion of the through hole, and the maximum diameter Is a diameter of a base that is a joint portion of the conical portion with the flange, and the cable is inserted and the flange is pressed against the outer surface. And the conical portion is in close contact with only the through hole in the motor housing at the close contact portion in a state in which the flange is pressed against the outer surface. A double seal structure is formed in close contact with the outer surface, and the conical portion is not in contact with the through hole at a portion other than the close contact portion in the through hole. The object is achieved by including the root and the outer end.
In the present invention, the conical shape is different from the official conical shape in which the bottom surface is a circle and the side projection is an isosceles triangle, and the side projection obtained by cutting the apex side with a plane parallel to the bottom surface is a trapezoid. Means a shape.

According to the first aspect of the present invention, the motor housing is provided with a sealing structure in which a through hole for inserting a cable is drilled, and water is prevented from entering the motor housing through a gap between the through hole and the cable. In the waterproof type reduction gear with a motor, an elastic bracket that surrounds the cable and is inserted into the through hole has a flange portion that contacts an outer surface of the motor housing, and is inserted into the through hole of the elastic bracket. The portion to be formed has a conical shape whose diameter decreases toward the inner side of the motor housing, and the maximum diameter of the conical portion of the elastic bracket is larger than the diameter of the outer end portion of the through hole, and the maximum The diameter is a diameter of a base that is a joint portion of the conical portion with the flange, and the cable is inserted and the flange is pressed against the outer surface. The conical portion is in close contact with only the through hole in the motor housing at the close contact portion in a state in which the flange is pressed against the outer surface. A double seal structure is formed in close contact with the outer surface, and the conical portion is not in contact with the through hole at a portion other than the close contact portion in the through hole. By including the root and the outer end portion, stress is not applied to the elastic bracket from the bottom surface of the through hole, so that the life of the elastic bracket can be extended.
In addition, the diameter of the root, which is the maximum diameter of the cone-shaped portion of the elastic bracket, is larger than the diameter of the outer end portion of the through hole, so that the vicinity of the root of the cone-shaped portion of the elastic bracket, that is, the cone-shaped portion and the flange A double seal structure is formed in which the vicinity of the joint portion with the portion and the vicinity of the outer end of the through hole are in close contact with each other, and the flange portion of the elastic bracket and the outer surface of the motor housing are in close contact with each other. Waterproofness is improved.

The side view of the reduction gear with a waterproof motor of this invention. The side view of the sealing structure of a reference example. FIG. 3 is a side view of the sealing structure according to the first embodiment. (A) of the sealing structure of Example 2 is a side view, (b) is a perspective view of a cable fixing plate. (A) of the sealing structure of Example 3 is a side view, and (b) is a perspective view of a cable fixing plate. The side view of the conventional sealing structure.

The present invention provides a reduction gear with a waterproof motor provided with a sealing structure in which a through hole for inserting a cable is drilled in the motor housing, and water is prevented from entering the motor housing through a gap between the through hole and the cable. In the machine, the elastic bracket that surrounds the cable and is inserted into the through hole has a flange portion that contacts the outer surface of the motor housing, and the portion that is inserted into the through hole of the elastic bracket is A conical shape having a diameter that decreases toward an inner side of the motor housing, wherein the maximum diameter of the conical portion of the elastic bracket is larger than a diameter of an outer end portion of the through hole, and the maximum diameter is the conical shape; The diameter of the base that is the joint portion with the flange in the shape portion, and the cable that inserts the cable and presses the flange against the outer surface In the state where the flange portion is in pressure contact with the outer surface, the conical portion is in close contact with only the through hole in the motor housing at the close contact portion, and the flange portion and the outer surface A double seal structure is formed in close contact with the surface, and the conical portion is not in contact with the through hole at a portion other than the close contact portion in the through hole,
The close contact portion includes the root and the outer end portion, and is a specific example of a speed reducer with a waterproof motor having a sealed structure that maintains a sealed state for a long time. Any specific embodiment may be used.

  First, the basic structure of the speed reducer with a waterproof motor according to the present invention will be described with reference to FIG. 2 is a cross-sectional view showing a basic structure of the sealing structure of the speed reducer with a waterproof motor according to the present invention, and FIG. 2 (a) is a sectional view in which components constituting the sealing structure are developed. (B) has shown sectional drawing with which the components which comprise a sealing structure were assembled.

  In this sealed structure, a through hole 26 is formed in the motor housing 24 so as to pass through an inner line 22a wrapped in an outer sheath 22b of the cable 22. The through hole 26 is a parallel cylindrical hole having the same diameter on the outside and inside of the motor housing 24. An elastic bracket 25 that surrounds the extension 22 a of the cable 22 is inserted into the through hole 26. The elastic body bracket 25 has a conical shape whose side surface 25 a is reduced in diameter toward the inner side of the motor housing 24, and has a flange portion 25 b that contacts the outer surface of the motor housing 24. Yes. The diameter of the base of the cone-shaped part of the elastic body bracket 25, that is, the maximum diameter of the cone-shaped part is slightly smaller than the diameter of the through-hole, that is, between the base of the cone-shaped part of the elastic body bracket 25 and the through-hole. Has a gap G1 as shown in FIG. Therefore, the side surface 25 a of the elastic body bracket 25 is not in contact with the side surface 26 a of the through hole 26. Therefore, the conical portion of the elastic bracket 25 is not subjected to stress from the motor housing 24, and the life of the elastic bracket 25 is extended.

  In addition, a cable fixing plate 23 is provided for pressing the flange portion 25 b of the elastic bracket 25 against the outer surface of the motor housing 24, and the cable fixing plate 23 and the motor housing 24 connect the flange portion 25 b of the elastic bracket 25. And the cable fixing plate 23 is screwed into a screw hole 27 screwed into the motor housing 24 with the fixing bolt 21 to seal the gap between the cable 22 and the motor housing 24.

  Next, an embodiment of a speed reducer with a waterproof motor according to the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing an example of a sealing structure of a speed reducer with a waterproof motor according to the present invention, in which FIG. 3 (a) is a cross-sectional view in which components constituting the sealing structure are developed, and FIG. FIG. 2 shows a cross-sectional view in which parts constituting a sealed structure are assembled.

  In this sealed structure, a through hole 36 through which an extension line 32 a wrapped in the outer sheath 32 b of the cable 32 is inserted is drilled in the motor housing 34. The through hole 36 is a parallel hole having the same diameter on the outer side and the inner side of the motor housing 34. An elastic bracket 35 surrounding the extension line 32 a of the cable 32 is inserted into the through hole 36. The elastic body bracket 35 has a conical shape whose side surface 35 a is reduced in diameter toward the inner side of the motor housing 34, and has a flange portion 35 b in contact with the outer surface of the motor housing 34. Yes. The diameter of the base of the conical portion of the elastic bracket 35 is slightly larger than the diameter of the outer end of the through hole 36, that is, the vicinity of the base of the conical portion of the elastic bracket 35 and the outer end of the through hole 36. Has a close contact portion G2 as shown in FIG. As described above, the conical portion is in close contact with only the through hole 36 in the motor housing 34 at the close contact portion G2, and the close contact portion G2 includes the root of the conical shape portion and the outer end portion of the through hole 36. ing.

  Further, a cable fixing plate 33 for pressing the flange portion 35 b of the elastic body bracket 35 against the outer surface of the motor housing 34 is provided. The cable fixing plate 33 and the motor housing 34 together with the flange portion 35 b of the elastic body bracket 35. And the cable fixing plate 33 is screwed into a screw hole 37 screwed into the motor housing 34 with the fixing bolt 31 to seal the gap between the cable 32 and the motor housing 34.

Therefore, in the present embodiment, the vicinity of the base of the conical portion of the elastic bracket 35, that is, the vicinity of the joint portion between the conical portion and the flange and the vicinity of the outer end of the through hole are in close contact, and the elastic bracket Since the double seal structure in which the flange portion 35b of the 35 and the outer surface of the motor housing are in close contact with each other is formed, the waterproof property of the sealed structure is improved.
As shown in FIG. 3B, the conical portion penetrates at a portion other than the close contact portion G <b> 2 in the through hole 36 in a state where the flange portion 35 b is pressed against the outer surface of the motor housing 34. There is no contact with the hole 36.

  Next, another embodiment of the speed reducer with a waterproof motor according to the present invention will be described with reference to FIG. FIG. 4 is a view showing an example of a sealing structure of a speed reducer with a waterproof motor according to the present invention, FIG. 4 (a) is a sectional view showing the sealing structure, and FIG. 4 (b) is a diagram of this embodiment. It is the perspective view which showed the cable fixing plate which is the main components which comprise a sealing structure.

  In this sealed structure, a through hole 46 through which an inner line 42 a wrapped in an outer sheath 42 b of the cable 42 is inserted is drilled in the motor housing 44. The through hole 46 is a parallel cylindrical hole having the same diameter on the outside and inside of the motor housing 44. An elastic body bracket 45 surrounding the extension line 42 a of the cable 42 is inserted into the through hole 46. The elastic body bracket 45 has a conical shape whose side surface 45 a is reduced in diameter toward the inner side of the motor housing 44, and has a flange portion 45 b that contacts the outer surface of the motor housing 44. Yes.

  Further, a cable fixing plate 43 for pressing the flange portion 45 b of the elastic body bracket 45 against the outer surface of the motor housing 44 is provided. The cable fixing plate 43 and the motor housing 44 are used to connect the flange portion 45 b of the elastic body bracket 45. And the cable fixing plate 43 is screwed into a screw hole screwed into the motor housing 44 with the fixing bolt 41, thereby sealing the gap between the cable 42 and the motor housing 44.

  As shown in FIG. 4B, the cable fixing plate 43 has a height lower than the thickness of the flange portion 45 b of the elastic bracket 45 on the outer peripheral edge side facing the motor housing 44 over the entire circumference. A protruding wall 43a is provided to protrude. Therefore, since the distance between the cable fixing plate 43 and the motor housing 44 is kept constant, it is possible to prevent the fixing bolt 41 from being tightened excessively and damage the flange 45a of the elastic bracket 45.

  Next, still another embodiment of the speed reducer with a waterproof motor according to the present invention will be described with reference to FIG. FIG. 5 is a view showing an example of a sealing structure of a speed reducer with a waterproof motor according to the present invention, FIG. 5 (a) is a sectional view showing the sealing structure, and FIG. 5 (b) is a diagram of the present embodiment. It is the perspective view which showed the cable fixing plate which is the main components which comprise a sealing structure.

  In this sealed structure, a through hole 56 through which an inner line 52 a wrapped in the outer sheath 52 b of the cable 52 is inserted is drilled in the motor housing 54. The through hole 56 is a parallel hole having the same diameter on the outer side and the inner side of the motor housing 54. An elastic bracket 55 surrounding the extension line 52 a of the cable 52 is inserted into the through hole 56. The elastic body bracket 55 has a conical shape whose side surface 55a decreases in diameter toward the inner side of the motor housing 54, and has a flange portion 55b in contact with the outer surface of the motor housing 54. Yes.

  Further, a cable fixing plate 53 for pressing the flange portion 55 b of the elastic body bracket 55 against the outer surface of the motor housing 54 is provided, and the cable fixing plate 53 and the motor housing 54 connect the flange portion 55 b of the elastic body bracket 55. And the cable fixing plate 53 is screwed into a screw hole screwed into the motor housing 54 with the fixing bolt 51, thereby sealing the gap between the cable 52 and the motor housing 54.

  As shown in FIG. 5B, the cable fixing plate 53 is provided on the side of the outer peripheral edge facing the motor housing 54 at least at three or more locations (four locations in this embodiment) at equal intervals. A protruding leg 53a having a height lower than the thickness of the flange portion 55b of the 55 is provided. Accordingly, since the distance between the cable fixing plate 53 and the motor housing 54 is kept constant, it is possible to prevent the fixing bolt 51 from being tightened excessively and damage the flange portion 55a of the elastic body bracket 55.

  The present invention provides a speed reducer with a waterproof motor having a sealed structure that keeps a sealed state for a long time, and its industrial applicability is extremely high.

10 ... Reducer with motor 12, 22, 32, 42, 52, 62 ... Cable 22a, 32a, 42a, 52a, 62a ... (for cable) extension 22b, 32b, 42b, 52b, 62b .. Outer sheath (cable) 14, 24, 34, 44, 54, 64... Motor housing 25, 35, 45, 55, 65... Elastic bracket 25a, 35a, 45a, 55a, 65a. Side surfaces 25b, 35b, 45b, 55b, 65b (of the elastic bracket) ... (elastomer bracket) flanges 16, 26, 36, 46, 56, 66 ... through holes 16a, 26a, 36a, 46a , 56a, 66a ... side surface 66b (through hole) bottom surface 66c (through hole) insertion holes 27, 37, 47, 57, 67 ... Screw hole

Claims (1)

In a speed reducer with a waterproof motor provided with a sealed structure that has a through hole through which a cable is inserted into the motor housing and prevents water from entering the inside of the motor housing from the gap between the through hole and the cable.
An elastic bracket that surrounds the cable and is inserted into the through hole has a flange portion that contacts an outer surface of the motor housing,
The portion inserted into the through hole of the elastic body bracket has a conical shape whose diameter decreases toward the inner side of the motor housing,
The maximum diameter of the conical portion of the elastic bracket is larger than the diameter of the outer end of the through hole;
The maximum diameter is a diameter of a base that is a joint portion with the flange portion in the conical portion,
A cable fixing plate for inserting the cable and press-contacting the flange with the outer surface;
In a state in which the flange portion is in pressure contact with the outer surface, the cone-shaped portion is in close contact with only the through hole in the motor housing at the contact portion, and the flange portion and the outer surface are in close contact with each other. A heavy seal structure is formed, and the conical portion is not in contact with the through-hole in a portion other than the tight-contact portion in the through-hole,
The reduction gear with a waterproof motor, wherein the close contact portion includes the root and the outer end.

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