JP2010156400A - Fixing structure of decelerator and driven shaft in axial direction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability of a decelerator by fixing a hollow shaft and a driven machine in the axial direction without backlash and also without being influenced on a driven shaft shape. <P>SOLUTION: A fixing structure is provided with: the driven shaft 132 inserted into the hollow shaft 106; a connection member 124 connected to a connection hole 134 formed at an end part 132A of the driven shaft 132; a spacer 112 and a first stop ring 116 arranged at the end part 132A; a convex part 110 integrally formed inside the hollow shaft 106; and an end plate 120 arranged on the opposite side of the driven shaft of the convex part 110 and held by the connection member 124. When the connection member 124 is connected to the connection hole 134, and an end part 106A of the hollow shaft 106 is pressed to the driven shaft side by the end plate 120, the spacer 112 and the first stop ring 116 are clipped by the convex part 110 and the driven shaft 132 so as to regulate displacement of the hollow shaft 106. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure for fixing a reduction gear and a driven shaft in an axial direction for attaching the driven shaft of a driven machine to the hollow shaft when, for example, the output shaft of the reduction gear is a hollow shaft.

  2. Description of the Related Art Conventionally, the following configuration is used to attach a reduction gear having a hollow shaft as an output shaft to a driven machine such as a conveyor.

  First, as shown in Patent Document 1, a retaining ring is fitted into a recess formed inside a hollow shaft, and a driven shaft provided with a step portion together with a key is inserted into the hollow shaft, and an end having an opening. The plate is brought into contact with the retaining ring, and the hollow shaft is fixed to the driven shaft by screwing the bolt into the female screw at the end of the driven shaft through the end plate.

  The other is shown in Non-Patent Document 1 and its structure is shown in FIG. The retaining ring 16 is fitted into the recess 8 formed inside the hollow shaft 6, and the driven shaft 32 and the spacer 12 arranged at the end of the driven shaft 32 are inserted into the hollow shaft 6 together with the key 40 to have an opening. The end plate 20 is brought into contact with the retaining ring 16, and the bolt 24 is screwed into the female thread 34 at the end of the driven shaft 32 through the end plate 20 and the spacer 12, thereby fixing the retaining ring 16 to the driven shaft 32. ing.

JP 2001-99177 A (FIG. 6) Nissei Corporation Product Catalog GTR GEARMOTOR Created in November 2007 (E59)

  However, in the invention described in Patent Document 1, the stepped portion is provided on the driven shaft so as to contact the hollow shaft in the axial direction. In other words, when there is no step portion in Patent Document 1, a gap is generated between the driven shaft and the retaining ring, and the hollow shaft is largely shaken in the axial direction with respect to the driven shaft, which is preferable in terms of power transmission and life. Absent. In order to avoid this, it is conceivable to process the driven shaft to provide a stepped portion, but there is a problem that the burden on the driven machine is large, such as a problem of reduction in strength due to processing cost and narrowing of the driven shaft. In addition, the “driven machine” is often a “completed device” on the driven side of a conveyor or the like, and simply because it does not fit with a specific reduction gear, etc. There was also a problem that it should not be.

  In Non-Patent Document 1, although the retaining ring 16 is fixed to the driven shaft 32, the width T of the recess 8 formed in the hollow shaft 6 for fitting the retaining ring 16 is smaller than the width t of the retaining ring 16. It must be large. Therefore, the hollow shaft 6 rattles by a gap having a width difference T−t in the axial direction. That is, even in Non-Patent Document 1, the hollow shaft 6 moves in the axial direction with respect to the driven shaft 32, which is also undesirable in terms of power transmission and life.

  The present invention has been made in view of such a problem, and the hollow shaft and the driven shaft of the driven machine are fixed without being rattled in the axial direction without being affected by the shape of the driven shaft. It is an object of the present invention to provide a structure for fixing the reduction gear and the driven shaft in the axial direction that can improve the durability of the device.

  According to the present invention, a driven shaft inserted into a hollow shaft of a reduction gear, a connecting portion formed at an end portion of the driven shaft, a connecting member connected to the connecting portion, and the connecting portion are formed. A ring-shaped member disposed at the end of the driven shaft; a convex portion integrally formed on the inner side of the hollow shaft so as to be adjacent to the end of the ring-shaped member on the opposite side of the driven shaft; and the convex portion At least a part of the hollow shaft by connecting the connecting member to the connecting portion. When the pressing portion is pressed to the driven shaft side, the ring-shaped member is sandwiched between the convex portion and the driven shaft so that the movement of the hollow shaft is restricted. It has been solved.

  The present invention is configured such that when the driven shaft is fixed in the axial direction, the processing load on the driven machine can be minimized and the characteristics of the driven machine can be maximized.

  That is, in the present invention, it is possible to use only the connecting portion for attaching the connecting member to the driven shaft of the driven machine for fixing in the axial direction. When the connecting member is connected to the connecting portion and at least a part of the hollow shaft is pressed to the driven shaft side by the pressing portion, the ring-shaped member is sandwiched between the convex portion and the driven shaft, thereby The hollow shaft can be fixed without rattling the driven shaft with respect to the driven shaft. For this reason, wear between the hollow shaft and the driven shaft can be prevented, and high-efficiency power transmission can be achieved without shortening the lifetime of each other.

  Here, the specific configuration and shape of the convex portion, the ring-shaped member, and the pressing portion are not particularly limited. For example, the convex portion may be formed by providing a concave portion along the inner circumferential direction of the hollow shaft, or may be formed by expanding the inner side of the hollow shaft in accordance with the outer diameter of the driven shaft. The ring-shaped member may include a spacer having a through hole and a first retaining ring that is disposed adjacent to the spacer on the side opposite to the driven shaft and has an outer diameter larger than the inner diameter formed by the convex portion. Good. Furthermore, the pressing part may have an outer diameter larger than the inner diameter of the convex part, or may have a second retaining ring that contacts a part of the hollow shaft.

  In any case, in the present invention, the ring-shaped member is sandwiched between the convex portion and the driven shaft, so that the movement of the hollow shaft in the axial direction is restricted, so that it can be fixed without rattling. It becomes.

  According to the present invention, the hollow shaft and the driven shaft of the driven machine are fixed in the axial direction without being affected by the shape of the driven shaft, and the durability of the reduction gear can be improved.

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

  FIG. 1 is an overall schematic view in which a reduction gear and a driven machine according to this embodiment of the present invention are connected and fixed, and FIG. 2 is a schematic diagram of a portion related to the axial fixing structure of the hollow shaft and driven shaft of FIG. Figure.

  First, the overall configuration in which the reduction gear and the driven machine are connected and fixed will be described with reference to FIG.

  The reduction gear device 100 includes a motor unit 102 and a reduction gear unit 104. The motor unit 102 houses a rotor and a stator (not shown), and the rotation of the rotor is transmitted to an input shaft (not shown) of the speed reducer unit 104. In the reduction gear unit 104, the rotation of the input shaft is decelerated by an orthogonal shaft gear set (such as a hypoid gear set) (not shown) and a parallel gear set (not shown) and is output from a hollow shaft 106 which is an output shaft. The hollow shaft 106 is attached and fixed to a driven shaft 132 that is an input shaft of a driven machine 130 such as a food factory conveyor.

  In order to transmit the rotational output of the hollow shaft 106 to the driven shaft 132, a key groove (not shown) is provided in the axial direction inside the hollow shaft 106. Correspondingly, a key groove 136 is provided in the axial direction on the outer periphery of the driven shaft 132, and the key 140 is disposed between the key groove of the hollow shaft 106 and the key groove 136 of the driven shaft 132.

  Below, the fixing structure to the axial direction of the hollow shaft 106 of the reduction gear part 104 and the driven shaft 132 is demonstrated using FIG. In FIG. 2, the display of the keyway 136 and the key 140 is omitted.

  The hollow shaft 106 and the driven shaft 132 are fixed in the axial direction mainly by the protrusion 110 formed on the hollow shaft 106 itself, the connecting member 124, the spacer 112 constituting the ring-shaped member, and the reaction of the spacer 112. This is made up of a first retaining ring 116 disposed adjacent to the driven shaft side and an end plate 120 serving as a pressing portion.

  The inner diameter D1 of the hollow shaft 106 is set slightly larger than the outer diameter of the driven shaft 132, and the driven shaft 132 can be easily inserted into the hollow shaft 106. A first recess 108 having a width T1 in the axial direction along the inner circumferential direction at a position close to an end 106A on the opposite side (referred to as an anti-driven shaft side) where the driven shaft 132 of the hollow shaft 106 is inserted. Is provided. For this reason, an integral convex portion 110 is formed inside the hollow shaft 106 between the end 106A of the hollow shaft 106 on the counter driven shaft side and the first concave portion 108 as a result.

  A connecting hole 134 that is a connecting portion for connecting the connecting member 124 is formed in the end portion 132 </ b> A of the driven shaft 132. The connecting member 124 is not particularly limited, and includes a head portion 124A and a rod-shaped shaft portion 124B having an outer diameter smaller than the outer diameter of the head portion 124A, and the length connected to the connecting hole 134 is adjusted. Therefore, it is preferable to use a bolt (including a screw) that can easily adjust the pressing force of the hollow shaft 106 toward the driven shaft. In this case, a female screw is formed in the connecting hole 134, and the adjustment of the pressing force is realized by a length to be screwed. In addition, a connection part is not limited to a hole shape.

  The spacer 112 is a cylindrical member having an outer diameter slightly smaller than the inner diameter D1 of the hollow shaft 106 and a through hole 114 at the center. The spacer 112 is disposed on the driven shaft side of the first recess 108 in the axial direction, and determines the insertion length of the hollow shaft 106 into the driven shaft 132.

  The first retaining ring 116 is an annular member having a thickness t1, an opening 118 at the center, and a slit in part. For this reason, when inserting into the hollow shaft 106, the diameter can be reduced by the width of the slit. The first retaining ring 116 is fitted into the first recess 108. The first retaining ring 116 has an outer diameter that is larger than the inner diameter of the hollow shaft 106 (the inner diameter formed by the convex portions 110) D1 and slightly smaller than the inner diameter between the bottom surfaces of the first concave portions 108 of the hollow shaft 106. d1. Since the thickness t1 of the first retaining ring 116 is smaller than the width T1 of the first recess 108, the first retaining ring 116 can be easily fitted into the first recess 108. The first retaining ring 116 connects the connecting member 124 to the connecting hole 134 and moves the hollow shaft 106 with respect to the driven shaft 132, so that the side surface (end portion) 116 </ b> B on the side opposite to the driven shaft from the convex portion 110. Adjacent with. Here, the opening 118 has an inner diameter that is larger than the outer diameter of the shaft portion 124 </ b> B of the connecting member 124 and smaller than the inner diameter of the through hole 114 provided in the spacer 112. Therefore, the force transmitted from the convex portion 110 of the hollow shaft 106 to the driven shaft side in the axial direction is transmitted from the side surface (end portion) 116A of the first retaining ring 116 to the entire side surface (end portion) 112A of the spacer 112. In other words, the reaction force from the spacer 112 against the side surface (end portion) 116A of the first retaining ring 116 is generated in the entire area of the side surface (end portion) 112A of the spacer 112. That is, since the reaction force to the counter driven shaft side per unit area that the first retaining ring 116 receives from the spacer 112 is small, local deformation of the first retaining ring 116 is prevented and the axial direction of the spacer 112 is prevented. Positioning can be performed accurately. The inner diameter of the opening 118 of the first retaining ring 116 is not limited to the case where it is smaller than the inner diameter of the through hole 114 of the spacer 112, and may be larger.

  The end plate 120 is an annular member having an opening 122 smaller than the inner diameter D1 of the hollow shaft 106 at the center. The end plate 120 has an outer diameter d2 that is larger than the inner diameter of the hollow shaft 106 (the inner diameter of the convex portion 110) D1. The shaft portion 124 </ b> B of the connecting member 124 is inserted into the opening portion 122. The inner diameter of the opening 122 is smaller than the outer diameter of the washer 125 loosely fitted to the connecting member 124, and the end plate 120 is held by the shaft portion 124 </ b> B of the connecting member 124, and is anti-removed by the head 124 </ b> A of the connecting member 124. Movement to the shaft side is restricted. The end plate 120 is disposed on the end 106 </ b> A of the hollow shaft 106, i.e., on the side opposite to the driven shaft of the convex 110. By connecting the connecting member 124 to the connecting hole 134 and moving the hollow shaft 106 with respect to the driven shaft 132, the convex portion 110 is held between the first retaining ring 116.

  When the end plate 120 presses the end 106A of the hollow shaft 106, the end plate 120 has an outer diameter d2 larger than the inner diameter D1 of the hollow shaft 106 and an opening 122 smaller than the inner diameter D1 of the hollow shaft 106. Press at the inner diameter. Since the center of the end plate 120 and the axial center of the hollow shaft 106 substantially coincide with each other, the contact area in the circumferential direction between the hollow shaft 106 and the end plate 120 is uniform, and no stress is locally applied to each other. That is, weight reduction can be realized without excessively thickening each other. At the same time, deformation and the like can be prevented, and a stable positional relationship can be maintained. Furthermore, in the present embodiment, since all the end portions 106A of the hollow shaft 106 are pressed by the end plate 120 in the radial direction, it is more difficult to deform and a stable positional relationship can be maintained.

  Next, a method for fixing the hollow shaft 106 and the driven shaft 132 in the axial direction will be described.

  First, a lubricant such as grease is applied to the first retaining ring 116, the surface of the spacer 112, the inside of the hollow shaft 106, and the surface of the driven shaft 132 as necessary.

  Next, the first retaining ring 116 is made smaller than the inner diameter D of the hollow shaft 106 and inserted inside the hollow shaft 106, and is disposed in the first recess 108 provided in the hollow shaft 106. Then, the spacer 112 is inserted from the driven shaft side end of the hollow shaft 106 until it abuts against the side surface 116A of the first retaining ring 116. Subsequently, the hollow shaft 106 is inserted so that the driven shaft 132 is in contact with the end portion 112 </ b> B of the spacer 112.

  Next, the shaft portion 124B of the connecting member 124 is inserted into the opening portion 122 of the end plate 120, and the end plate 120 is brought into contact with the end portion 106A of the hollow shaft 106 on the counter-driven shaft side. Then, the shaft portion 124 </ b> B of the connecting member 124 is passed through the first retaining ring 116 and the spacer 112 and connected to the connecting hole 134 formed in the end portion 132 </ b> A of the driven shaft 132. By rotating the head portion 124 </ b> A of the connecting member 124, the connecting length between the connecting member 124 and the driven shaft 132 is increased. By increasing the length of connection, the distance between the driven shaft 132 and the end plate 120 is reduced, and the first retaining ring 116 positioned at the end 112A of the spacer 112 on the counter-driven shaft side is protruded. It is made to contact | abut to the side 110A of the part 110. Further, by increasing the length of the connecting member 124 connected to the driven shaft 132, the convex portion 110 that is a part of the hollow shaft 106 is pressed toward the driven shaft by the end plate 120 that is a pressing portion. Then, the movement of the hollow shaft 106 in the axial direction relative to the driven shaft 132 is regulated by sandwiching the spacer 112 and the first retaining ring 116 between the convex portion 110 and the driven shaft 132. .

  By fixing in this way, the hollow shaft 106 can be fixed to the driven shaft 132 without the hollow shaft 106 rattling in the axial direction with respect to the driven shaft 132. For this reason, wear between the hollow shaft 106 and the driven shaft 132 can be prevented, and high-efficiency power transmission can be achieved without shortening the lifetime of each other. At the same time, it is possible to process the driven machine 130 to the driven shaft 132 only by the connecting hole 134 for attaching the connecting member 124, minimizing both the processing of the driven machine 130 and the influence on the characteristics of the driven machine 130. Can be.

  Further, since the hollow shaft 106 is processed only by the first recess 108 having the width T1 in combination with the use of the first retaining ring 116, the hollow shaft 106 can be easily and stably fixed although the number of processing steps for the hollow shaft 106 is small. Can do.

  Further, an end plate 120 having an outer diameter d2 larger than the inner diameter D1 of the hollow shaft 106 and an inner diameter of the opening 122 smaller than the inner diameter D1 of the hollow shaft 106 is adopted, and the center of the end plate 120 and the hollow shaft 106 The end centers of the hollow shaft 106 are pressed by the end plate 120 in the radial direction so that the shaft centers are substantially coincident with each other. For this reason, there are many parts that are in contact with each other, and the pressing force is uniformly distributed in the circumferential direction, so that the hollow shaft 106 and the end plate 120 are not excessively thickened with each other, and are not deformed. More stable fixing can be performed.

  That is, according to the present invention, the hollow shaft 106 and the driven shaft 132 of the driven machine 130 are fixed in the axial direction without being affected by the presence or absence of the stepped portion of the driven shaft 132, and the deceleration is reduced. The durability of the device 100 can be improved.

  Next, a structure for fixing the hollow shaft and the driven shaft in the axial direction according to the second embodiment of the present invention will be described with reference to FIG. Also in FIG. 3, the display of the keyway and the key is omitted.

  In this embodiment, the second embodiment is the same as the first embodiment except that a second recess 209 and a second retaining ring 226 are newly provided and the outer diameter of the end plate 220 is reduced. As for, the last two digits are the same as in the first embodiment, and the description is omitted.

  The second recess 209 has a width T2 in the axial direction and is provided on the side opposite to the driven shaft with respect to the first recess 208 and along the inner circumferential direction of the hollow shaft 206. For this reason, the convex portion 210 is integrally formed on the inner side of the hollow shaft 206 between the first concave portion 208 and the second concave portion 209.

  The second retaining ring 226 is a part of the pressing part, and is an annular member having a thickness t2 and an opening 228 at the center, and a slit in part. For this reason, when inserting, the diameter can be reduced by the amount of the slit. The opening 228 has an inner diameter that is larger than the outer diameter of the shaft portion 224 </ b> B of the connecting member 224 and smaller than the outer diameter d <b> 2 of the end plate 220. The second retaining ring 226 is larger than the inner diameter (inner diameter formed by the convex portion 210) D1 of the hollow shaft 206 and slightly smaller than the inner diameter between the bottom surfaces of the second concave portions 209 of the hollow shaft 206. An outer diameter d3 is provided. Since the thickness t2 of the second retaining ring 226 is smaller than the width T2 of the second recessed part 209, the second retaining ring 226 can be easily fitted into the second recessed part 209.

  The end plate 220 is a part of the pressing portion, and is an annular member having an outer diameter d5 and an opening 222 at the center. The outer diameter d5 is smaller than the inner diameter D1 of the hollow shaft 106, and the shaft portion 224B of the connecting member 224 is fitted into the opening 222. Therefore, when the shaft portion 224B of the connection member 224 is inserted into the opening 228 of the second retaining ring 226 after the shaft portion 224B of the connection member 224 is inserted into the end plate 220, the end plate 220 The second retaining ring 226 can come into contact with the side surface 210 </ b> B of the convex portion 210 of the hollow shaft 206.

  With such a configuration, similarly to the first embodiment, the hollow shaft 206 and the driven shaft 232 can be stably fixed in the axial direction. At this time, since the end plate 220 is housed in the hollow shaft 206 by the second recess 209 and the second retaining ring 226, the hollow shaft 206 and the driven shaft 232 are fixed short in the axial direction. Can do. At this time, by adjusting the formation position of the second recess 209 so that the head 224A of the connecting member 224 does not protrude from the end of the hollow shaft 206 as shown in FIG. can do.

  Next, a structure for fixing the hollow shaft and the driven shaft in the axial direction according to the third embodiment of the present invention will be described with reference to FIG. Also in FIG. 4, the display of the keyway and the key is omitted.

  In the present embodiment, the configuration is the same as that of the first embodiment except that the second recess 309 is mainly provided and the end plate 320 is accommodated inside the hollow shaft 306. Are the same as those in the first embodiment, and a description thereof is omitted.

  The second recess 309 is formed with a width T3 in the axial direction from the end 306A on the counter driven shaft side along the inner circumferential direction of the hollow shaft 306. For this reason, an integral convex portion 310 is formed inside the hollow shaft 306 as a result between the first concave portion 308 and the second concave portion 309.

  The end plate 320 is an annular member that constitutes a pressing portion and has a thickness t3 outer diameter d5 and an opening 322 in the center. The outer diameter d5 is larger than the inner diameter D1 of the hollow shaft 306 and slightly smaller than the inner diameter between the bottom surfaces of the second recesses 309. For this reason, the end plate 320 can be easily fitted into the second recess 309 of the hollow shaft 306 from the end 306 </ b> A of the hollow shaft 306.

  With such a configuration, similarly to the first embodiment, the hollow shaft 306 and the driven shaft 332 can be stably fixed in the axial direction. At this time, since the end plate 320 is housed in the hollow shaft 306, the axial length can be shortened as in the second embodiment. Furthermore, since the second retaining ring can be eliminated, the number of parts can be reduced compared to the second embodiment, and the handling of the second retaining ring in the assembly is unnecessary, and the assembly can be facilitated.

  Next, a structure for fixing the hollow shaft and the driven shaft in the axial direction according to the fourth embodiment of the present invention will be described with reference to FIG. Also in FIG. 5, the display of the keyway and the key is omitted.

  In the present embodiment, the configuration is the same as that of the first embodiment except that the size of the hollow shaft, the spacer, and the driven shaft is not used, and the retaining ring is not used. The description is omitted as it is the same as that of the first embodiment.

  The hollow shaft 406 includes a portion having an inner diameter D1 that is slightly larger than the outer diameter of the driven shaft 432, and a portion having an inner diameter D2 that is on the opposite side of the driven shaft 432 and smaller than the outer diameter of the driven shaft 432. Prepare. For this reason, the driven shaft 432 can be inserted into the inner diameter D1 of the hollow shaft 406. The portion of the hollow shaft 406 having the inner diameter D1 can be formed by cutting the driven shaft from the driven shaft side so as to leave the convex portion 410 from the hollow shaft having the inner diameter D2. In order to position the hollow shaft 406 in the axial direction with respect to the driven shaft 432, a spacer 412 having an appropriate length in the axial direction is used. The spacer 412 is an annular member having the same outer diameter as the driven shaft 432, an outer diameter d4 smaller than the inner diameter D2, and a through hole 414 in the center. That is, as a result, the convex portion 410 is provided on the side opposite to the driven shaft in the axial direction with respect to the position where the spacer 412 of the hollow shaft 406 is inserted. For this reason, by connecting the connecting member 424 to the connecting hole 434 and moving the hollow shaft 406 with respect to the driven shaft 432, the spacer 412 has one end 412 </ b> A in the axial direction that is a convex portion of the hollow shaft 406. 410 abuts on the side surface 410 </ b> A, and the other end 412 </ b> B abuts on the end 432 </ b> A of the driven shaft 432.

  With such a configuration, similarly to the first embodiment, the hollow shaft 406 and the driven shaft 432 can be stably fixed in the axial direction. At this time, since a retaining ring is not required, the number of members to be used can be further reduced, and handling of the retaining ring in assembly is not necessary, and assembly and fixing can be performed more easily.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment. That is, it goes without saying that improvements and design changes can be made without departing from the scope of the present invention.

  For example, in the above embodiment, the end plate or the second retaining ring constituting the pressing portion is larger than the inner diameter constituted by the convex portion, but the present invention is not limited to this. For example, even if the end plate or the second retaining ring is small, a part of the end plate or the second retaining ring may be held by the connecting member so as to press only a part in the circumferential direction of the hollow shaft.

  In the above embodiment, the key and the key groove are used to transmit the rotation of the hollow shaft to the driven shaft. However, the present invention is not limited to the configuration for transmitting the rotation of the hollow shaft to the driven shaft. Bonding, D-cut bonding, or the like may be used.

  Further, in the embodiment of the host machine, the retaining ring and the end plate serving as the pressing portion are formed separately from the connecting member, but the present invention is not limited to this, and the pressing member may be formed directly on the connecting member. Good.

FIG. 1 is an overall schematic diagram in which a reduction gear and a driven machine according to a first embodiment of the present invention are connected and fixed. FIG. 2 is a schematic view of a structure for fixing the hollow shaft and the driven shaft in FIG. 1 in the axial direction. The schematic diagram of the fixing structure to the axial direction of the hollow shaft and driven shaft which concerns on 2nd Embodiment of this invention. The schematic diagram of the fixing structure to the axial direction of the hollow shaft and driven shaft which concerns on 3rd Embodiment of this invention. The schematic diagram of the fixing structure to the axial direction of the hollow shaft and driven shaft which concerns on 4th Embodiment of this invention. Schematic diagram of fixing structure of hollow shaft and driven shaft in the axial direction according to the prior art

Explanation of symbols

6, 106, 206, 306, 406 ... Hollow shaft 8, 108, 208, 209, 308 ... Recess 12, 112, 212, 312, 412 ... Spacer 16, 116, 216, 226, 316 ... Retaining ring 20, 120, 220, 320, 420 ... end plate 24, 124, 224, 324, 424 ... connecting member 30, 130 ... driven machine 32, 132, 232, 332, 432 ... driven shaft 34, 134, 234, 334, 434 ... connecting hole 40, 140 ... key 100 ... speed reducer 102 ... motor unit 104 ... speed reducer unit 106A, 110A, 112A, 112B, 116A, 116B, 132A, 210B, 306A, 410A, 412A, 412B, 432A ... end (side surface)
110, 210, 310, 410 ... Projection 114, 214, 314, 414 ... Through hole 118, 122, 218, 222, 228, 318, 322, 422 ... Opening 124A, 224A ... Head 124B, 224B ... Shaft 136 ... keyway

Claims (7)

A driven shaft inserted into the hollow shaft of the speed reducer;
A connecting portion formed at an end of the driven shaft;
A connecting member connected to the connecting portion;
A ring-shaped member disposed at the end of the driven shaft in which the connecting portion is formed;
A convex portion integrally formed on the inner side of the hollow shaft so as to be adjacent to the end of the ring-shaped member on the opposite side of the driven shaft;
A pressing portion that is disposed on the anti-driven shaft side of the convex portion and is restricted from moving toward the anti-driven shaft side by the connecting member;
With
When the connecting member is connected to the connecting portion and at least a part of the hollow shaft is pressed toward the driven shaft by the pressing portion, the ring-shaped member is sandwiched between the convex portion and the driven shaft. A structure in which the movement of the hollow shaft is restricted. The structure for fixing the reduction gear and the driven shaft in the axial direction. In claim 1,
An outer diameter of the pressing portion is larger than an inner diameter of the convex portion. A structure for fixing the reduction gear and the driven shaft in the axial direction. In claim 1 or 2,
The ring-shaped member includes a spacer having a through hole, and a first retaining ring that is disposed adjacent to the counter-driven shaft side of the spacer and has an outer diameter larger than the inner diameter of the convex portion. A structure in which the reduction gear and the driven shaft are fixed in the axial direction. In any one of Claims 1 thru | or 3,
The convex portion is formed by providing a first concave portion in which at least a part of the ring-shaped member is fitted and provided along the inner circumferential direction of the hollow shaft. Fixed structure in the axial direction with the driven shaft. In any one of Claims 1 thru | or 4, Furthermore,
A structure in which the reduction gear and the driven shaft are fixed in the axial direction, wherein at least a part of the pressing portion is fitted, and a second recess is provided along the inner circumferential direction of the hollow shaft. In any one of Claims 1 thru | or 5,
The pressing portion has a second retaining ring that abuts at least a part of the hollow shaft. A structure for fixing the reduction gear and the driven shaft in the axial direction. In any one of Claims 1 thru | or 6.
An inner diameter of the convex portion is smaller than an outer diameter of the driven shaft. A structure for fixing the reduction gear and the driven shaft in the axial direction.

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