JP2018135923A - Speed reducer, power transmission and series of speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of easily meeting a request to a position accuracy of a speed reducer to an opposite machine, as well as enabling sanitation measures for the speed reducer.SOLUTION: A speed reducer includes a first casing 16-A where a first speed reduction mechanism is stored. The first casing 16-A has a contact surface 34 contacting with an opposite machine as an object to be attached, and an antibacterial layer coating a base surface outside the first casing 16-A. The antibacterial layer is not coated with a base surface of the contact surface 34. The contact surface 34 may be formed into an endless ring shape.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reduction gear, a power transmission device using the same, and a series of reduction gears using the same.

  The reduction gear may be used in a place where hygiene management is required, such as a factory that handles foods, pharmaceuticals, and the like. In this case, sanitary measures may be required for the reduction gear. As a speed reducer that takes this measure, Patent Document 1 discloses an antibacterial coating on the surface.

JP 2006-22876 A

  In some cases, this type of reduction gear is directly attached to the counterpart machine with a part in contact with the counterpart machine. In this case, in order to guarantee the normal operation of the reduction gear, it is required to arrange the reduction gear with high positional accuracy with respect to the counterpart machine. There has not yet been proposed a speed reducer capable of providing hygiene measures while devising the position accuracy of the speed reducer with respect to the counterpart machine.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a technology that can easily meet the demand for the positional accuracy of the speed reducer with respect to the counterpart machine while taking hygiene measures for the speed reducer. is there.

  One embodiment of the present invention relates to a speed reducer. The speed reduction device includes a first casing in which a first speed reduction mechanism is accommodated, wherein the first casing is in contact with a counterpart machine that is an attachment counterpart; An antibacterial layer that covers an outer surface of the casing, and the antibacterial layer is not covered on the surface of the contact surface.

  ADVANTAGE OF THE INVENTION According to this invention, the request | requirement with respect to the position accuracy of the reduction gear with respect to the other machine can be easily met, aiming at the hygiene countermeasure of a reduction gear.

It is a side view showing the 1st power transmission device in which the 1st reduction gear of a 1st embodiment is used. It is the figure which looked at the 1st reduction gear device from the arrow Pa of FIG. Fig.3 (a) is typical sectional drawing in locations other than the contact surface of the 1st reduction gear casing of 1st Embodiment, FIG.3 (b) is the contact surface of a 1st reduction gear casing. It is typical sectional drawing in. It is a figure which shows the cut surface of the 1st fan cover of the 1st motor of 1st Embodiment with a periphery structure. It is a top view which shows the 2nd power transmission device of 1st Embodiment. It is the figure which looked at the 2nd speed reducer of the 2nd power transmission device of 1st Embodiment from the axial direction of the 2nd output shaft. It is a top view showing the 1st power transmission device in which the 1st reduction gear of a 2nd embodiment is used. It is the figure which looked at the 1st reduction gear device from the arrow Pc of FIG. It is a side view showing the 2nd power transmission device in which the 1st reduction gear of a 3rd embodiment is used. It is the figure which looked at the 1st reduction gear device from the arrow Pd of FIG.

  Hereinafter, in the embodiment and the modification, the same reference numerals are given to the same components, and the duplicate description is omitted. In the drawings, for convenience of explanation, some of the components are omitted as appropriate, and the dimensions of the components are appropriately enlarged and reduced. In addition, separate components with common points are distinguished by adding “first, second” at the beginning of the name and “-A, -B” at the end of the code. These are omitted.

  FIG. 1 is a side view showing a first power transmission device 10-A in which the first reduction gear 12-A of the first embodiment is used. The first power transmission device 10-A is a gear motor including a first speed reduction device 12-A and a first motor 14-A, and these are integrated. The first motor 14-A will be described later.

  The first reduction gear 12-A includes a first reduction gear casing 16-A, a first input shaft (not shown), a first reduction mechanism 18-A, and a first output shaft 20-A.

  The first reduction gear casing 16-A includes a first storage portion 22-A having a hollow structure in which the first reduction mechanism 18-A is stored. The first reduction gear casing 16-A will be described later.

  The first input shaft is for inputting rotational power output from a power source. The power source of the present embodiment is a first motor 14-A, and rotational power is input from a motor shaft (not shown) of the first motor 14-A. The first input shaft may be formed integrally with the motor shaft, or may be provided separately from the motor shaft.

  The first reduction mechanism 18-A is for reducing the rotational power of the first input shaft and transmitting it to the first output shaft 20-A. The first reduction mechanism 18-A of the present embodiment is a parallel shaft gear reduction mechanism that reduces rotational power by a plurality of gears provided on a plurality of parallel gear shafts.

  The first output shaft 20-A is for outputting the rotational power transmitted from the first reduction mechanism 18-A to a driven shaft (not shown) of the counterpart machine 24 to be driven. The first output shaft 20-A protrudes outward from an outer wall portion that separates the inside and outside of the first reduction gear casing 16-A, and is inserted into an insertion hole 24b formed in the outer wall portion 24a of the counterpart machine 24. . The first output shaft 20-A is coupled to the driven shaft of the counterpart machine 24 so as to be integrally rotatable, for example, by a coupling structure such as a key. Hereinafter, among the axial directions of the first output shaft 20-A, the direction in which the first output shaft 20-A projects from the first reduction gear casing 16-A is referred to as a projecting direction Pb.

  The first reduction gear casing 16-A is arranged in the radial direction of the first output shaft 20-A from the first storage portion 22-A on the projecting direction Pb side of the first output shaft 20-A from the first storage portion 22-A. It has a flange portion 28 that projects outwardly in a collar shape. The flange portion 28 is annular and plate-shaped.

  FIG. 2 is a view of the first reduction gear 12-A as seen from the arrow Pa in FIG. This figure is also a view seen from the axial direction of the first output shaft 20-A. As shown in FIGS. 1 and 2, the first reduction gear casing 16 -A has the counterpart machine 24 as an attachment counterpart. The first reduction gear casing 16 -A has an abutment surface 34 for abutting against the outer wall portion 24 a of the counterpart machine 24 when attached to the counterpart machine 24. The contact surface 34 is provided on the radially outer side of the first output shaft 20-A. The contact surface 34 of the present embodiment is provided on the outer surface of the flange portion 28 facing the protruding direction Pb of the first output shaft 20-A.

  The contact surface 34 has an endless ring shape that is connected in a ring shape over the entire circumference around the first output shaft 20-A when viewed from the axial direction of the first output shaft 20-A. The outer shape of the contact surface 34 is substantially rectangular, that is, substantially polygonal, as viewed from the axial direction of the first output shaft 20-A. The contact surface 34 has a plurality of corner portions 34a formed by the polygonal shape, and a plurality of linear side portions 34b connecting the plurality of corner portions 34a.

  The corner portion 34a of the contact surface 34 has a line width larger than that of the side portion 34b adjacent to the corner portion 34a. The line width here refers to the width in a direction orthogonal to the direction connecting adjacent corners 34a across one side 34b mentioned here, as viewed from the axial direction of the output shaft 20-A. Say. For example, a first corner 34a (upper left corner 34a in FIG. 2) and a second corner 34a (in FIG. 2) that are adjacent to each other across the first side 34b (left side 34b in FIG. 2). Let Pe be the direction connecting the lower left corner 34a). At this time, the width of the first side 34b in the direction orthogonal to the direction Pe becomes the line width L1 of the first side 34b, and the width of the first corner 34a in the direction orthogonal to the first side 34b. Line width L2. In this embodiment, the line width L1 of the first side 34b is constant, and the line width L2 of the first corner 34a is larger than the line width L1. The line width L2 of the first corner portion 34a of the present embodiment gradually increases as the distance from the second corner portion 34a adjacent to the first side portion 34b increases. The line width L2 of the first corner portion 34a of the present embodiment is larger than the line width L1 of the first side portion 34b so as to spread inside the polygon formed by the contact surface 34. Here, the conditions relating to the line width between one side 34b of the abutment surface 34 and the corner 34a adjacent to the side 34b are described, but the other side 34b and other The same condition is satisfied between the corner 34a adjacent to the side 34b.

  The abutting surface 34 has a first bolt hole 34 c for inserting a first bolt 36 used for attachment to the counterpart machine 24. The first bolt hole 34 c of the present embodiment penetrates the flange portion 28 together with the contact surface 34. The first bolt hole 34c penetrates each of the plurality of corner portions 34a. The first bolt 36 is inserted into the first bolt hole 34c from the side opposite to the contact surface 34 toward the contact surface 34, and is screwed into the female screw hole 24d formed in the counterpart machine 24. The first reduction gear casing 16-A and the counterpart machine 24 are fastened. Thereby, the first reduction gear casing 16 -A is attached to the counterpart machine 24 using the first bolt 36. From another viewpoint, the first reduction gear casing 16-A is not installed on an external member different from the counterpart machine 24 via the legs, but includes legs for installation on the external members. Absent.

  The first reduction gear casing 16-A is opposite to the protruding direction Pb of the first output shaft 20-A from the contact surface 34 of the first reduction gear casing 16-A around the first output shaft 20-A. A recess 32 which is recessed. The recess 32 is provided between the contact surface 34 of the first reduction gear casing 16-A and the first output shaft 20-A when viewed from the axial direction of the first output shaft 20-A. The recess 32 opens toward the protruding direction Pb of the first output shaft 20 -A, and its internal space is continuous with the internal space 24 c of the counterpart machine 24.

  FIG. 3A is a schematic cross-sectional view of a portion other than the contact surface 34 of the first reduction gear casing 16-A, and FIG. 3B is a schematic view of the first reduction gear casing 16-A. 4 is a schematic cross-sectional view at a contact surface 34. FIG. The first reduction gear casing 16 -A includes an antibacterial layer 38 that covers the outer ground surface 16 a and an adhesive layer 40 provided between the ground surface 16 a and the antibacterial layer 38. Here, the base 16a is a surface serving as a base for a surface treatment layer such as the antibacterial layer 38, and is a surface formed by the base material itself of the first reduction gear casing 16-A. The antibacterial layer 38 and the adhesive layer 40 are covered on the outer ground surface 16a at locations other than the contact surface 34 of the first reduction gear casing 16-A.

  The antibacterial layer 38 is provided in the outermost layer of the first reduction gear casing 16-A and is exposed to the outside air around the first reduction gear casing 16-A. The antibacterial layer 38 contains an antibacterial agent and has antibacterial properties against fungi. The antibacterial agents here are inorganic antibacterial agents, organic antibacterial agents, and the like, and specific examples thereof are not particularly limited. The antibacterial layer 38 of this embodiment contains a paint in addition to the antibacterial agent. The antibacterial layer 38 is obtained, for example, by applying a paint containing an antibacterial agent, plating, or the like.

  The adhesive layer 40 contains an adhesive such as a coating adhesive and has a function of adhering the base 16a and the antibacterial layer 38. The adhesive layer 40 is obtained, for example, by applying an adhesive.

  In FIG. 2, a portion where the antibacterial layer 38 is not coated on the outer surface of the first reduction gear casing 16 -A is shown by double hatching, and a portion where the antibacterial layer 38 is coated is not double-hatched. As shown in FIGS. 2 and 3B, the antibacterial layer 38 is not covered with the ground surface 16 a of the contact surface 34. In addition to the antibacterial layer 38, the adhesive layer 40 is not coated on the ground surface 16 a of the contact surface 34. When the first reduction gear casing 16-A is not attached to the counterpart machine 24, the ground surface 16a of the contact surface 34 is exposed to the outside air and exposed. As shown in FIG. 1, when the first reduction gear casing 16 -A is attached to the mating machine 24, the entire ground surface 16 a of the abutting surface 34 abuts on the outer wall 24 a of the mating machine 24. Is not exposed to the open air.

  The ground surface 16a of the contact surface 34 is a smooth surface having a predetermined range of surface roughness. The surface roughness is such that the first reduction gear casing 16 -A is disposed at a predetermined target position when the base surface 16 a of the contact surface 34 is attached in a state of contacting the counterpart machine 24. Is set to a range. The target position here refers to a target position with respect to the relative position of the first reduction gear casing 16 -A with respect to the counterpart machine 24. In this example, the angle formed by the central axis of the first output shaft 20-A with respect to the central axis of the driven shaft of the counterpart machine 24 and the offset amount between the driven shaft and the first output shaft 20-A are determined in advance. A position that falls within the specified range. Such a smooth surface is obtained by machining such as cutting.

The effect of the first reduction gear 12-A will be described.
First, consider the case where the antibacterial layer 38 is coated on the contact surface 34 of the first reduction gear casing 16-A. In this case, the antibacterial layer 38 of the contact surface 34 is compressed by being sandwiched between the ground 16a of the contact surface 34 and the counterpart machine 24 when the first reduction gear casing 16-A is attached to the counterpart machine 24. Power is introduced. This compression force is generated, for example, when the axial force of the first bolt 36 acts on the first reduction gear casing 16 -A and the counterpart machine 24. It is difficult to make the distribution of the compressive force uniform on the contact surface 34, and the distribution of the compressive force usually varies depending on the position on the contact surface 34. As a result, the antibacterial layer 38 of the contact surface 34 is easily deformed, and the first reduction gear casing 16 -A is easily attached in a state where the relative position with respect to the counterpart machine 24 is shifted from the target position. That is, when the contact surface 34 of the first reduction gear casing 16 -A is coated with the antibacterial layer 38, the first reduction gear casing 16 with respect to the counterpart machine 24 is caused by the antibacterial layer 38 of the contact surface 34. -A position accuracy is degraded.

  Moreover, the antibacterial layer 38 is normally obtained by apply | coating the coating material containing an antibacterial agent with respect to the base 16a of the 1st reduction gear casing 16-A. Therefore, it is usually difficult to ensure the flatness of the outer surface of the antibacterial layer 38, and in combination with this point, the positional accuracy of the first reduction gear casing 16-A with respect to the counterpart machine 24 is lowered.

(A) In this respect, the antibacterial layer 38 is not coated on the contact surface 34 for contacting the counterpart machine 24 in the first reduction gear casing 16 -A of the present embodiment. Therefore, the first reduction gear casing 16 -A can be attached to the counterpart machine 24 without sandwiching the antibacterial layer 38 with the counterpart machine 24. Thereby, the fall of the position accuracy of the 1st reduction gear casing 16-A with respect to the other machine 24 resulting from the antimicrobial layer 38 of the contact surface 34 of the 1st reduction gear casing 16-A can be prevented. Further, the ground surface 16a of the contact surface 34 of the first reduction gear casing 16-A can be attached to the counterpart machine 24 with a positional accuracy corresponding to the flatness. The flatness of the ground surface 16a can be easily increased in precision by machining, and is not easily deformed unlike the antibacterial layer 38. Therefore, it is possible to easily meet the demand for the positional accuracy of the first reduction gear casing 16-A with respect to the counterpart machine 24.

(A) Further, the contact surface 34 of the first reduction gear casing 16-A is in contact with the counterpart machine 24 and is not exposed to the outside air. In particular, since the first reduction gear casing 16 -A is attached to the counterpart machine 24 by the first bolt 36, the contact surface 34 is contacted with the counterpart machine 24 with a high degree of adhesion by the axial force of the first bolt 36. It touches. Therefore, even if the contact surface 34 of the first reduction gear casing 16-A is not covered with the antibacterial layer 38, an environment in which the contact surface 34 is not exposed to the outside air can be realized, and hygiene measures can be taken on the contact surface 34. I can plan. Further, the first reduction gear casing 16 -A has the antibacterial layer 38 coated on the outer ground surface 16 a at a place other than the contact surface 34, and a hygiene measure can be taken at a place other than the contact surface 34. For this reason, according to the present embodiment, it is possible to easily meet the request for the positional accuracy of the first reduction gear 12 -A with respect to the counterpart machine 24 while taking hygiene measures for the first reduction gear 12 -A.

(B) Further, when a large flow velocity air flow passing between the first reduction gear casing 16-A and the counterpart machine 24 is generated in the vicinity of the contact surface 34 of the first reduction gear casing 16-A, Air may enter between the contact surface 34 and the counterpart machine 24. In this regard, the contact surface 34 of the first reduction gear casing 16-A of the present embodiment has an endless ring shape. As a result, when the contact surface 34 of the first reduction gear casing 16-A is brought into contact with and attached to the counterpart machine 24, the internal space 24c of the counterpart machine 24 and the external space 42 of the first reduction gear casing 16-A ( 1) is not formed between the first reduction gear casing 16-A and the counterpart machine 24. For this reason, generation | occurrence | production of the airflow of the high flow velocity between the internal space 24c and the external space 42 which pass between 1st reduction gear casing 16-A and the other party machine 24 can be prevented. As a result, air can be effectively prevented from entering between the contact surface 34 of the first reduction gear casing 16 -A and the counterpart machine 24, and hygiene measures can be effectively taken at the contact surface 34.

(C) Further, the first bolt hole 34c of the contact surface 34 penetrates the corner portion 34a of the contact surface 34, and the corner portion 34a has a shape bulging so that the line width is wider than the side portion 34b. Therefore, the contact area with the counterpart machine 24 can be increased at the corner 34a around the first bolt hole 34c where the axial force of the first bolt 36 acts greatly, and the first bolt 36 is loosened with respect to the counterpart machine 24. It becomes difficult to occur. As a result, the state in which the contact surface 34 of the first reduction gear casing 16-A is in contact with the counterpart machine 24 can be maintained for a long period of time, and the contact surface 34 can take hygiene measures for a long period of time. Further, since the side portion 34b has a shape whose line width is narrower than that of the corner portion 34a, the area of the contact surface 34 to be improved in accuracy can be reduced, and the flatness of the ground surface 16a can be increased in accuracy. Can be achieved more easily. Therefore, the request for the positional accuracy of the first reduction gear casing 16-A with respect to the counterpart machine 24 can be more easily met.

(D) Further, an adhesive layer 40 is provided between the base 16a of the first reduction gear casing 16-A and the antibacterial layer 38. Therefore, the antibacterial layer 38 of the first reduction gear casing 16-A can be prevented from peeling off from the ground 16a, and hygiene measures can be taken for a long time.

Next, the first motor 14-A will be described.
FIG. 4 is a view showing a cut surface of a first fan cover 50-A (described later) of the first motor 14-A together with a peripheral structure. As shown in FIGS. 1 and 4, the first motor 14 -A of the present embodiment is a squirrel-cage induction motor. The first motor 14-A includes a first motor casing 44-A, a first motor shaft 46-A, a first fan 48-A, and a first fan cover 50-A.

  The load side end of the first motor casing 44-A is connected to the first reduction gear casing 16-A and is integrated with the first reduction gear casing 16-A. The first motor casing 44-A houses a stator and a rotor (not shown) inside. Similarly to the first reduction gear casing 16-A, the first motor casing 44-A also includes an antibacterial layer that covers the outer ground surface, and an adhesive layer provided between the antibacterial layer and the ground surface.

  The first motor shaft 46-A is attached to the rotor so as to be integrally rotatable. A protruding portion 46a that protrudes from the first motor casing 44-A is provided at the opposite end of the first motor shaft 46-A.

  The first fan 48-A is mounted on the protruding portion 46a of the first motor shaft 46-A. The first fan 48-A rotates integrally with the first motor shaft 46-A, and an air flow is generated by the rotation.

  The first fan cover 50-A covers the first fan 48-A from the opposite load side of the first motor shaft 46-A, and covers the first fan 48-A from the radially outer side of the first motor shaft 46-A. cover. The first fan cover 50-A has a bottomed cylindrical shape and is attached to the first motor casing 44-A. The first fan cover 50-A includes a bottom wall portion 50a that forms the bottom of the first fan cover 50-A, and a cylindrical peripheral wall portion 50b. A plurality of intake holes 50c are formed in the bottom wall portion 50a. The opening of the peripheral wall 50b opposite to the bottom wall 50a serves as a vent 50d through which an air flow generated by the rotation of the first fan 48-A flows in the first fan cover 50-A. This air flow strikes the outer surface of the first motor casing 44-A, thereby promoting the heat radiation of the first motor casing 44-A and cooling the first motor casing 44-A.

  Here, 1st fan cover 50-A has an antibacterial layer which coat | covers each outer side and inner surface. Unlike the first reduction gear casing 16-A, the antibacterial layer of the first fan cover 50-A covers not only the outer surface of the first fan cover 50-A but also the inner surface of the first fan cover 50-A. Yes. Further, the first fan cover 50-A has an adhesive layer provided between the ground surface and the antibacterial layer. The adhesive layer of the first fan cover 50-A is also different from the first speed reducer casing 16-A, in addition to the gap between the outer surface of the first fan cover 50-A and the antibacterial layer, and the inner layer thereof. It is also provided between the ground and the antibacterial layer. The components of the antibacterial layer and adhesive layer of the first fan cover 50-A are the same as the antibacterial layer and adhesive layer of the first reduction gear casing 16-A in the present embodiment.

(E) The antibacterial layer of the first fan cover 50-A covers the outer and inner surfaces of the bottom wall portion 50a of the first fan cover 50-A and the peripheral wall portion of the first fan cover 50-A. The outer and inner surfaces of 50b are covered. The antibacterial layer covers the ground surface of the inner wall surface of the intake hole 50c as the ground surface inside the bottom wall portion 50a of the first fan cover 50-A. The antibacterial layer covers the ground surface of the load side end surface 50e of the peripheral wall portion 50b as the ground surface outside the peripheral wall portion 50b of the first fan cover 50-A. The antibacterial layer of the first fan cover 50-A covers the entire surface of the first fan cover 50-A so that the entire surface of the first fan cover 50-A is not exposed to the outside air. Thereby, an antibacterial layer is provided in the whole part exposed to the external air of the 1st fan cover 50-A, and hygiene measures can be aimed at the whole 1st fan cover 50-A.

  Next, a series of reduction gears will be described. This series is also a series of power transmission devices. A plurality of power transmission devices belonging to the series share some hardware elements as described later.

  FIG. 5 is a plan view showing another second power transmission device 10-B belonging to the series. FIG. 6 is a view of the second reduction gear 12-B of the second power transmission device 10-B as viewed from the axial direction of the second output shaft 20-B. The power transmission device series includes a second power transmission device 10-B in addition to the first power transmission device 10-A. The second power transmission device 10-B includes a second reduction device 12-B and a second motor 14-B.

  The second reduction gear 12-B includes a second reduction gear casing 16-B, a second input shaft (not shown), a second reduction mechanism 18-B, and a second output shaft 20-B. Since the second input shaft has the same function as the first input shaft, description thereof is omitted.

  The second reduction gear casing 16-B includes a leg portion 54 for installation on the external member 52 in addition to the hollow second storage portion 22-B in which the second reduction gear mechanism 18-B is stored. The external member 52 is disposed outside the second reduction gear 12-B. The external member 52 is, for example, a floor surface or a wall surface around the counterpart machine 24, and has a role of supporting the second reduction gear 12-B. The leg 54 will be described later.

  The second reduction mechanism 18-B is the same as the first reduction mechanism 18-A. Here, “same” means the number and size of the components of the hardware element (here, the speed reduction mechanism) referred to between the first speed reduction device 12-A and the second speed reduction device 12-B. Of course, it means that the material of the component is shared. The second reduction gear 12-B is the same as the other internal parts housed in the first reduction gear casing 16-A with respect to other internal parts housed in the second reduction gear casing 16-B. Things are used. Here, the other internal components are a gear shaft that supports a gear constituting the speed reduction mechanism, a bearing that supports the gear shaft, an oil seal, and the like.

  The second output shaft 20-B protrudes from the second reduction gear casing 16-B. A rotating member 58 for winding the endless transmission member 56 is attached to the second output shaft 20-B. The transmission member 56 and the rotation member 58 are, for example, a combination of a chain and a sprocket, a combination of a timing belt and a pulley, or the like. The second output shaft 20 -B is coupled to a driven shaft (not shown) of the counterpart machine 24 via a transmission member 56 so that rotational power can be transmitted.

  The leg portion 54 includes a plate-like seat portion 54 a that sits on the external member 52, and an installation surface 54 b that is provided on the seat portion 54 a and is brought into contact with the external member 52. The installation surface 54b extends in the intersecting direction Pc intersecting the axial direction of the second output shaft 20-B when viewed from the axial direction of the second output shaft 20-B. The installation surface 54b also extends in the axial direction of the second output shaft 20-B. The seat portion 54a is provided at a position that is offset to both sides of the intersecting direction Pc with the second output shaft 20-B interposed therebetween as viewed from the axial direction of the second output shaft 20-B.

  The leg portion 54 has a second bolt hole 54 c for inserting a second bolt 60 used for installation to the external member 52. The second bolt hole 54 c passes through the seat portion 54 a together with the installation surface 54 b of the leg portion 54. The second bolt hole 54c is a long hole extending in the aforementioned crossing direction Pc when viewed from the axial direction of the second output shaft 20-B. The second bolt hole 54c is inserted into the second bolt hole 54c from the opposite side of the installation surface 54b toward the installation surface 54b, and is screwed into the external member 52, whereby the second reduction gear casing 16-B. The leg portion 54 and the external member 52 are fastened. Thereby, the leg part 54 of the 2nd reduction gear casing 16-B is installed in the external member 52 using the 2nd volt | bolt 60. FIG. From another viewpoint, the second reduction gear casing 16 -B is not directly attached to the counterpart machine 24, and does not include an abutment surface that is brought into contact with the counterpart machine 24.

  As shown in FIG. 3A, the second speed reducer casing 16-B includes an antibacterial layer 38 that covers the outer ground surface 16a, and an adhesive layer that is provided between the ground surface 16a and the antibacterial layer 38. 40. The antibacterial layer 38 and the adhesive layer 40 of the second reduction gear casing 16-B have the same functions and components as the antibacterial layer 38 and the adhesive layer 40 of the first reduction gear casing 16-A. The antibacterial layer 38 of the second reduction gear casing 16-B is also coated on the ground surface 16a of the installation surface 54b of the second reduction gear casing 16-B. The antibacterial layer 38 of the second reduction gear casing 16-B is also coated on the ground surface 16a at a location other than the installation surface 54b of the second reduction gear casing 16-B.

  The second motor 14-B includes a second motor casing 44-B, a second motor shaft, a second fan, and a second fan cover 50-B. These have the same functions as the similarly named components of the first motor 14-A. Similarly to the second reduction gear casing 16-B, the second motor casing 44-B also includes an antibacterial layer that covers the outer ground surface, and an adhesive layer provided between the antibacterial layer and the ground surface. The second fan cover 50-B also has an antibacterial layer that covers the outer and inner surfaces, and an adhesive layer provided between the antibacterial layer and the substrate.

The effect of the above series will be described.
The second reduction gear casing 16-B has an antibacterial layer 38 that covers the ground surface 16a at the location including the installation surface 54b, and the sanitary measures are extensive over the basic surface 16a of the second reduction gear casing 16-B. Can be planned.

(F) Further, the second reduction gear casing 16 -B has the legs 54 installed on the external member 52, and is not directly attached to the counterpart machine 24. When the leg portion 54 of the second reduction gear casing 16 -B is installed on the external member 52, the second output shaft 20 -B of the second reduction gear 12 -B is normally connected to the driven shaft of the counterpart machine 24. And so on. In this case, in order to ensure the normal operation of the second reduction gear, it is not required to be arranged with high positional accuracy with respect to the driven shaft of the counterpart machine 24. In this example, even if the second reduction gear casing 16-B is displaced with respect to the driven shaft of the counterpart machine 24, the transmission member 56 bends slightly following the displacement, This is because the misalignment can be absorbed. Therefore, even when the antibacterial layer 38 is provided on the installation surface 54b of the second reduction gear casing 16-B, it is possible to easily meet the demand for the positional accuracy of the second reduction gear casing 16-B with respect to the counterpart machine 24.

  For this reason, according to this series, not only the first reduction gear 12-A but also the second reduction gear 12-B can easily meet the demand for positional accuracy with respect to the counterpart machine 24 while taking hygiene measures. .

  Further, the first reduction mechanism 18-A of the first reduction gear 12-A is the same as the second reduction mechanism 18-B of the second reduction gear 12-B. Therefore, some hardware elements can be shared among a plurality of reduction gears in the series, the number of parts to be managed in the entire series can be suppressed, and the manufacturing cost and the management cost in the entire series can be reduced.

  From the viewpoint of obtaining the effect (F) described above, as a connection structure for connecting the driven shaft of the counterpart machine 24 and the second output shaft 20-B, the second output shaft 20- with respect to the driven shaft is used. What can absorb the position shift of B should just be used. As an example, the combination of the endless transmission member 56 and the rotating member 58 has been described. However, the present invention is not limited to this, and for example, a coupling or the like may be used.

Next, other features of the reduction gear series will be described.
Regarding the first speed reducer 12-A, the play amount of the first bolt 36 with respect to the first bolt hole 34c is defined as a first play amount La. The first play amount La is the maximum relative displacement amount allowed in the radial direction of the first bolt 36 with respect to the first bolt hole 34c. The first play amount La of the present embodiment is represented by a difference value between the diameter of the circular shaft portion of the first bolt 36 and the diameter of the circular first bolt hole 34c.

  Regarding the second reduction gear 12-B, the play amount of the second bolt 60 with respect to the second bolt hole 54c is defined as a second play amount Lb. The second play amount Lb is the maximum relative displacement amount allowed in the radial direction of the second bolt 60 with respect to the second bolt hole 54c. The second play amount Lb of the present embodiment is an allowable maximum relative displacement amount in the intersecting direction Pc of the second bolt 60 with respect to the second bolt hole 54c.

  Here, the second play amount Lb is set to be larger than the first play amount La. Thereby, even when a positional shift occurs in the relative position of the second reduction gear casing 16-B with respect to the driven shaft of the counterpart machine 24, the relative position of the second reduction gear casing 16-B with respect to the driven shaft. Can be finely adjusted. As a result, the position accuracy of the second reduction gear casing 16-B relative to the counterpart machine 24 can be more easily met through the position adjustment of the second reduction gear casing 16-B.

  The second bolt hole 54c is a long hole extending in the intersecting direction Pc when viewed from the axial direction of the second output shaft 20-B. Therefore, it becomes easy to adjust the tension of the transmission member 56 through the position adjustment of the second reduction gear casing 16-B in the intersecting direction Pc, and the request for the positional accuracy with respect to the counterpart machine 24 can be more easily met.

(Second Embodiment)
FIG. 7 is a plan view showing a first power transmission device 10-A in which the first reduction gear 12-A of the second embodiment is used. FIG. 8 is a view of the first reduction gear 12-A as viewed from the arrow Pc in FIG. The first reduction mechanism 18-A of the present embodiment is an orthogonal shaft gear reduction mechanism that reduces rotational power by a plurality of gears provided on gear shafts orthogonal to each other.

  In addition, the flange part 28 is not provided in 1st reduction gear casing 16-A of 2nd Embodiment. The first bolt hole 34c is an outer wall on the side opposite to the protruding direction Pb of the first output shaft 20-A from the contact surface 34 of the first reduction gear casing 16-A with respect to the first reduction mechanism 18-A. 1st reduction gear casing 16-A is penetrated so that it may continue to the outer surface 16b of a part.

  The first reduction gear casing 16-A of the present embodiment includes a first divided member 16c and a second divided member 16d that are formed by dividing the first reduction gear casing 16-A in the axial direction of the first output shaft 20-A. Have. The first divided member 16c is provided on the protruding direction Pb side of the first output shaft 20-A, and the second divided member 16d is provided on the opposite side to the protruding direction Pb.

  The contact surface 34 of the second embodiment has a bulging portion 34d that bulges inside the polygon from each intermediate portion of the plurality of side portions 34b. The bulging portion 34d is provided in the first reduction gear casing 16-A as a part of a columnar portion extending in the axial direction of the first output shaft 20-A. Bolt holes 34e are formed in the bulging portion 34d along the axial direction of the first output shaft 20-A, and fastening bolts (not used) for fastening the first divided member 16c and the second divided member 16d to the bolt holes 34e. Is inserted. The bolt hole 34e is opened toward the protruding direction Pb of the first output shaft 20-A (the front side in FIG. 8). The fastening bolt does not protrude from the bolt hole 34e in the protruding direction Pb, but is located on the back side (the back side in FIG. 8) from the opening edge of the bolt hole 34e.

  Also in this embodiment, the conditions related to the configuration described in (A) to (E) described in the first embodiment are satisfied, and similar effects can be obtained.

  Also in this embodiment, as in the first embodiment, the contact surface 34 for contact with the counterpart machine 24 is not covered with the antibacterial layer 38 and the adhesive layer 40, and the element of the first reduction gear casing 16-A is not covered. The ground 16a is exposed. Therefore, as in the first embodiment, it is possible to easily meet the request for the positional accuracy of the first reduction gear 12 -A relative to the counterpart machine 24 while taking hygiene measures for the first reduction gear 12 -A.

(Third embodiment)
FIG. 9 is a side view showing a second power transmission device 10-A in which the first reduction gear 12-A of the third embodiment is used. FIG. 10 is a view of the first reduction gear 12-A as viewed from the arrow Pd in FIG. The first speed reduction mechanism 18-A of the present embodiment is an eccentric oscillating speed reduction mechanism that rotates by rotating an oscillating gear that meshes with a meshing gear by an eccentric body and outputs the rotation component. Thus, the type of the speed reduction mechanism housed in the speed reducer casing is not particularly limited. For example, other known speed reduction mechanisms such as a flexure meshing speed reduction mechanism may be used.

  As in the first embodiment, the first reduction gear casing 16-A is arranged around the first output shaft 20-A from the contact surface 34 of the first reduction gear casing 16-A. It does not have the recessed part 32 dented in the opposite side to the protrusion direction Pb. A part 16e of the first reduction gear casing 16-A protrudes from the abutment surface 34 of the first reduction gear casing 16-A in the protruding direction Pb of the first output shaft 20-A, and the insertion hole of the counterpart machine 24 It is fitted in 24b.

  Also in this embodiment, the conditions related to the configuration described in (A), (B), (D), and (E) described in the first embodiment are satisfied, and the same effect can be obtained.

  Also in this embodiment, as in the first embodiment, the contact surface 34 for contact with the counterpart machine 24 is not covered with the antibacterial layer 38 and the adhesive layer 40, and the element of the first reduction gear casing 16-A is not covered. The ground 16a is exposed. Therefore, as in the first embodiment, it is possible to easily meet the request for the positional accuracy of the first reduction gear 12 -A relative to the counterpart machine 24 while taking hygiene measures for the first reduction gear 12 -A.

  In the above, the example of embodiment of this invention was demonstrated in detail. The above-described embodiments are merely specific examples for carrying out the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and many design changes such as changes, additions, deletions, etc. of constituent elements are possible without departing from the spirit of the invention defined in the claims. Is possible. In the above-described embodiment, the contents that can be changed in the design are described with the notation of “embodiment”, “in the embodiment”, and the like. Changes are not unacceptable. Moreover, the hatching given to the cross section of drawing does not limit the material of the hatched object.

  Although the 1st reduction gear casing 16-A demonstrated the example integrated with 1st motor 14-A, it does not need to be integrated with 1st motor 14-A. The shape of the first motor casing 44-A and the first reduction gear casing 16-A is not particularly limited.

  Although the contact surface 34 demonstrated the example which makes | forms an endless ring shape, the shape is not restricted especially. For example, the contact surface 34 may have a ring shape in which a part of the circumferential direction is notched as viewed from the axial direction of the first output shaft 20-A, or is configured by a plurality of parts separated in the circumferential direction. May be.

  Although the substantially quadrangular shape has been described as an example of the substantially polygonal shape formed by the contact surface 34, the specific shape is not limited to this. The example has been described in which the line width L2 of the first corner portion 34a gradually increases as the distance from the second corner portion 34a sandwiching the first side portion 34b adjacent to the first corner portion 34a increases. It may be. Further, the example in which the line width L2 of the first corner portion 34a is larger than the line width L1 of the first side portion 34b so as to spread inside the polygon formed by the contact surface 34 has been described. It may be larger than the line width L1 of the first side 34b so as to expand.

  Although the example in which the adhesive layer 40 is provided between the ground 16a of the first reduction gear casing 16-A and the antibacterial layer 38 has been described, the present invention is not limited thereto. For example, the adhesive layer 40 may not be provided, and other layers may be provided.

12-A ... 1st reduction gear, 12-B ... 2nd reduction gear, 16-A ... 1st reduction gear casing, 16-B ... 2nd reduction gear casing, 16a ... Substrate, 18-A ... 1st reduction Mechanism, 18-B ... second reduction mechanism, 24 ... counterpart machine, 34 ... abutting surface, 34a ... corner, 34b ... side, 34c ... first bolt hole, 36 ... first bolt, 38 ... antibacterial layer, 40 ... Adhesive layer, 52 ... External member, 54 ... Leg, 54b ... Installation surface, 54c ... Second bolt hole, 60 ... Second bolt.

Claims (8)

A speed reduction device comprising a first casing in which a first speed reduction mechanism is housed,
The first casing has an abutment surface for abutting against a mating machine that is an attachment counterpart, and an antibacterial layer that covers an outer surface of the first casing,
The antibacterial layer is a speed reducer that is not coated on the ground surface of the contact surface.   The reduction device according to claim 1, wherein the contact surface has an endless ring shape. The contact surface has a substantially polygonal outer shape, a plurality of corner portions formed by the polygon shape, a plurality of linear side portions connecting the plurality of corner portions, and attachment to the counterpart machine. A first bolt hole for inserting a first bolt to be used;
The first bolt hole penetrates the corner,
The reduction device according to claim 1 or 2, wherein the corner portion has a larger line width than the side portion adjacent to the corner portion.   The speed reduction device according to any one of claims 1 to 3, wherein the first casing has an adhesive layer provided between a ground surface of the first casing and the antibacterial layer. A reduction gear according to any one of claims 1 to 4,
A motor having a fan that rotates integrally with the motor shaft, and a fan cover that covers the fan,
The fan cover is a power transmission device having an antibacterial layer covering the outer and inner surfaces. A first reduction gear, which is the reduction gear according to any one of claims 1 to 4;
A second speed reduction device comprising a second casing in which the same second speed reduction mechanism as the first speed reduction mechanism is housed;
The second casing has a leg portion for installation on an external member, and an antibacterial layer that covers a ground surface outside the second casing,
The leg portion has an installation surface for making contact with the external member,
The antibacterial layer is a series of reduction gears that covers the ground surface of the installation surface. The contact surface has a first bolt hole for inserting a first bolt used for attachment to the counterpart machine,
The leg portion has a second bolt hole for inserting a second bolt used for installation to the external member,
The series of reduction gears according to claim 6, wherein a play amount of the second bolt with respect to the second bolt hole is larger than a play amount of the first bolt with respect to the first bolt hole. The second reduction gear has a second output shaft protruding from the second casing,
The installation surface extends in an intersecting direction intersecting the axial direction as seen from the axial direction of the second output shaft,
The leg portion has a second bolt hole for inserting a second bolt used for installation to the external member,
The series of reduction gears according to claim 6 or 7, wherein the second bolt hole is a long hole that is long in the intersecting direction.

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