JP2020012476A - Fixing device - Google Patents

Abstract

To provide a fixing device capable of preventing loosening while obtaining axial force.SOLUTION: A fixing device 16 includes a first nut 21, a second nut 22, a washer 24, twelve locking bolts 25, and three axial force bolts 26. The first nut 21 is provided with first to twelfth locking bolt insertion holes 21a to 21l, first to third axial force bolt insertion holes 21m to 21o, and a female screw 21p. The second nut 22 is provided with first to twelfth locking female screws 22a to 22l, first to third axial force female screws 22m to 22o, and a female screw 22p. The locking bolt 25 includes a locking bolt shaft portion 25b in which a locking male screw 25a is formed, and a head portion 25c. The axial force bolt 26 includes an axial force bolt shaft portion 26b in which an axial force male screw 26a is formed. The locking bolts 25 do not contact with the washer 24, and the axial force bolts 26 contact with the washer 24.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a fixing device for fixing with a bolt and a nut.

  A fixing device for fixing a fixing member by screwing a nut to a bolt is widely and generally used. In such a fixing device, measures are taken to prevent the nut from being loosened (for example, Patent Document 1).

  In the fixing device (screw ring) described in Patent Literature 1, loosening of the nut is suppressed by tightening and locking a bolt provided on the nut. However, in the fixing device described in Patent Literature 1, when the bolt provided on the nut is tightened, the nut may bend, and when the nut is bent, the axial force (the axial force of the bolt). Becomes weaker.

  Therefore, in the fixing device (load transmission device) described in Patent Literature 2, the axial force is increased by applying a load in the pulling direction to the bolt.

Japanese Patent No. 4662774 Japanese Patent No. 3957780

  However, in the fixing device described in Patent Literature 2, although the axial force can be increased, since the locking force does not change, the fixing device may be loosened.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fixing device that can prevent loosening while obtaining an axial force.

  In the fixing device of the present invention, a first member having a shaft portion having a shaft male screw portion formed on an outer peripheral surface is inserted into the opening formed in the second member, and the shaft screw portion is formed into the opening. A fixing device that is fixed to the second member while projecting from the first nut, the first nut having a first insertion hole and a second insertion hole that are screwed to the male shaft thread portion and penetrate in the axial direction. And a first female screw portion and a second female screw portion which are screwed to a portion of the shaft male screw portion closer to the base end than the portion to which the first nut is screwed and penetrate in the axial direction are formed. A second nut engaged with the first nut; and a first male screw portion inserted through the first insertion hole of the first nut and screwed into the first female screw portion of the second nut. A first bolt having a first shaft portion, a head having a larger diameter than the first shaft portion, and the first nut of the first nut. A second bolt having a second shaft portion having an outer peripheral surface formed with a second male screw portion which is inserted through an insertion hole and is screwed to the second female screw portion of the second nut; The bolt is configured such that the first male screw portion is inserted through the first insertion hole of the first nut and screwed into the first female screw portion of the second nut, and the head is the first female screw portion. The tip of the first shaft portion is formed to have a length that does not protrude from the second nut when abutting on the nut, and the second bolt has a second male screw portion formed by the second nut. The second nut is formed to have a length in contact with a third member on which the second nut is mounted in a state of being screwed to the female screw portion.

  According to the present invention, by contacting the head of the first bolt with the first nut, the female screw portion of the first nut can be pressed against the male shaft screw portion in the bolt tightening direction (for example, downward). On the other hand, the female screw portion of the second nut can be pressed against the male shaft screw portion in the opposite direction (for example, upward) of the bolt tightening direction. As described above, according to the present invention, since a force in two directions can be applied to the male shaft screw portion, the first nut can be applied as compared to a device in which only one direction of force is applied to the male shaft screw portion. Since the screwing force between the second nut and the first member is increased, the force in the direction of preventing the first nut and the second nut from being loosened can also be increased.

  Further, the tip of the second bolt is brought into contact with the third member on which the second nut is placed, so that the female screw portion of the second nut is turned in the opposite direction (for example, upward) to the bolt tightening direction. Can be strongly pressed, so that a large axial force can be obtained as much as the strongly pressed.

  Further, it is preferable that the third member is formed of a ring-shaped washer through which the shaft portion is inserted, which is positioned in contact with the second member, and on which the second nut is placed.

  According to this configuration, by contacting the tip of the second bolt with the washer, it is possible to more stably and surely obtain a large axial force.

  Further, each of the second insertion hole of the first nut and the second female screw portion of the second nut is spaced apart from each other in the circumferential direction of the first nut and the second nut by a first interval or more. A plurality of the first insertion holes of the first nut and the first female screw portions of the second nut are respectively formed from the first gap in the circumferential direction of the first nut and the second nut. It is preferable that a plurality of holes are formed at intervals smaller than the narrow second interval, and the number is larger than each of the second insertion hole of the first nut and the second female screw portion of the second nut.

  The applicant's diligent studies have revealed that a greater force is required for the locking force than the axial force. According to the above configuration, since the number of the first bolts is larger than the number of the second bolts, the direction in which the first nut and the second nut are prevented from loosening is smaller than that in which the number of the first bolts is equal to or less than the number of the second bolts. Power can be strengthened.

  The distance between the adjacent first insertion hole and the second insertion hole of the first nut is equal to the distance between the adjacent first insertion holes arranged between the adjacent second insertion holes of the first nut. It is preferable that the distance is smaller than the interval between the insertion holes.

  According to this configuration, the interval between the adjacent first insertion hole and the second insertion hole of the first nut is a plurality of adjacent first insertion holes arranged between the adjacent second insertion holes of the first nut. More first bolts can be arranged than those having the same distance between them. Further, even if the second bolts are arranged therebetween, the first bolts can be arranged as uniformly as possible in the circumferential direction. Thereby, the force in the direction of preventing the shaft portion from loosening can be increased.

  Further, it is preferable that a base end of the second bolt on the head side has a diameter equal to or smaller than a diameter of the second shaft, and a concave portion is formed on a distal end surface.

  According to this configuration, since the concave portion is formed at the center of the distal end surface, only the outer peripheral portion of the distal end surface of the second bolt comes into contact with the third member. It is possible to prevent the second bolt for generating the axial force from being loosened as compared with a member that comes into contact with the member. Further, since the base end portion is different between the first bolt (the head having a larger diameter than the first bolt shaft portion) and the second bolt (there is no head), the base portion is sunk under the device to be the first nut and the second nut. Even when it is necessary to attach the first nut and the second nut, it is possible to determine whether the bolt is the first bolt or the second bolt even by touching it with hand. Can be tightened by

It is a perspective view showing the parts storage extraction device concerning one embodiment of the present invention. It is a side view which shows a main-body part, a speed reducer, and a gear shaft. It is a perspective view showing a gear shaft and a fixing device. FIG. 3 is an exploded perspective view showing a gear shaft and a fixing device. FIG. 5 is an exploded end view showing a first nut, a second nut, a washer, a locking bolt, and an axial force bolt. FIG. 4 is an end view showing a first nut, a second nut, a washer, a locking bolt, and an axial force bolt in a state where the locking bolt is screwed to the first nut. It is an exploded end view showing a gear shaft and a fixing device. It is an end elevation which shows a gear shaft and a fixing device.

  Hereinafter, a component storage and extraction device including a fixing device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the component storage and extraction apparatus 1 of the present embodiment divides a space between an outer peripheral side and an inner peripheral side of a cylindrical body 2 having a hollow portion 2a on an inner peripheral side into a multi-stage and multi-row. A fixed storage shelf 4 having the formed component storage section 3, a first component transfer device 5 a provided rotatably along the outer peripheral surface of the storage shelf 4, and storage in the hollow portion 2 a of the cylindrical body 2. A second component conveying device 5b rotatably provided along the inner peripheral surface of the shelf 4. In addition, the storage shelf 4 includes a passage 4a that communicates the outer peripheral side and the inner peripheral side along part of the outer peripheral surface of the cylindrical body 2 along the axial direction.

  The component storage portion 3 stores a metal ring (not shown) having elasticity as a component. The outer peripheral side end surface 3a and the inner peripheral surface end surface 3b of the cylindrical body 2 are open, and the both ends are formed. The metal ring can be stored and extracted. In this embodiment, the metal ring constitutes each layer of a laminated ring used as a belt for a continuously variable transmission (CVT), and is manufactured such that size data such as a circumference value becomes a design value. After that, the size data is separately measured.

  The first component transport device 5a is provided with a columnar member 6a provided along the outer peripheral surface of the storage shelf 4 in parallel with the height direction of the storage shelf 4, and movably in the vertical direction along the columnar member 6a. It comprises a vertical moving device 7a and a component holding device 8a provided in the vertical moving device 7a. The first component transport device 5a is provided on a table 9 rotatably provided along the outer peripheral surface at a lower portion of the storage shelf 4 and circulates around the storage shelf 4 according to the operation of the table 9. It is free.

  On the other hand, the second component transport device 5b includes a columnar member 6b provided in parallel with the height direction of the storage shelf 4 along the inner peripheral surface of the storage shelf 4 in correspondence with the first component transport device 5a, The vertical movement device 7b is provided movably in the vertical direction along the member 6b, and the component gripping device 8b is provided on the vertical movement device 7b. The columnar member 6b itself extends along the inner peripheral surface of the storage shelf 4. It is provided rotatably by rotating. The vertical movement devices 7a and 7b move along the grooves 10a and 10b. As the component storage and extraction device 1, a device described in detail in JP-A-2002-145410 can be used.

  As shown in FIG. 2, the component storage and extraction device 1 includes a rotation mechanism 11 for rotating the second component transport device 5b. In FIG. 1, illustration of the rotation mechanism 11 is omitted.

  The rotation mechanism 11 includes a main body 12 (second member), a motor 13 provided in the main body 12, a plurality of reduction gears (not shown) connected to the motor 13, and configured to reduce the output from the motor 13. And a gear shaft 15 (first member) connected to the speed reducer 14. The gear shaft 15 is fixed to the main body 12 by a fixing device 16 described later in detail.

  The main body 12 has an opening 12a into which the shaft 15a of the gear shaft 15 is inserted, and a receiving portion 12b.

  The gear shaft 15 includes a stepped shaft portion 15a inserted into the opening 12a of the main body portion 12, and a gear portion 15b provided below the shaft portion 15a. An external thread portion 15c is formed.

  When the shaft portion 15a is inserted into the opening 12a, the male shaft portion 15c of the gear shaft 15 projects from the opening 12a, and the stepped portion of the lower portion of the shaft portion 15a contacts the lower surface of the main body portion 12. Positioned.

  The gear portion 15b is meshed with a reduction gear, which is the final stage of the speed reducer 14, and a ring gear 5c attached to the upper end of the second component conveying device 5b. Thereby, the rotation of the motor 13 is transmitted to the ring gear 5c via the speed reducer 14 and the gear shaft 15, and the second component conveying device 5b to which the ring gear 5c is attached rotates.

  As shown in FIGS. 3 and 4, the fixing device 16 includes a first nut 21 and a second nut 22. Further, the fixing device 16 includes a ring-shaped washer 24, twelve locking bolts 25 (first bolts), and three axial force bolts 26 (second bolts). The axial force bolt 26 is longer than the locking bolt 25.

  The first nut 21 has first to twelfth bolt holes 21a to 21l for preventing loosening (first insertion holes), first to third bolt holes 21m to 21o for axial force, and second holes 21m to 21o (second insertion holes). , A female screw portion 21p formed on the wall surface forming the hole.

  In the second nut 22, first to twelfth female screws for prevention of loosening 22a to 221 (first first to twelfth) are formed on the wall surface forming the hole and screwed with the male screw for preventing loosening 25a of the locking bolt 25. Female screw portion) and first to third axial force female screw portions 22m to 22o (second female) formed on the wall surface forming the hole and screwed with the axial force male screw portion 26a of the axial force bolt 26. Screw portion) and a female screw portion 22p formed on the wall surface forming the hole.

  In the present embodiment, each of the first to third axial force bolt insertion holes 21m to 21o of the first nut 21 and the first to third axial force internal thread portions 22m to 22o of the second nut 22 is the first A plurality (for example, three) of the nuts 21 are formed at equal intervals (for example, 120 °) or more at a first interval (for example, 110 °) in the circumferential direction. Note that the above numerical values can be appropriately changed.

  The distance between the first to third axial force bolt insertion holes 21m to 21o of the first nut 21 and the first to third axial force female threads 22m to 22o of the second nut 22 is the first distance. The intervals need not be equal as long as the intervals are longer than the intervals. For example, the intervals may be 110 °, 120 °, and 130 °.

  Further, in the present embodiment, the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21 and the first to twelfth locking female screw portions 22a to 22l of the second nut 22, respectively, A plurality (12) of the first nuts 21 are formed in the circumferential direction at a second interval smaller than the first interval. Note that the above numerical values can be appropriately changed.

  Each of the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21 and the first to twelfth female screw portions 22a to 22l of the second nut 22 are adjacent to each other. In the case where the first to third axial force bolt insertion holes 21m to 21o of the first nut 21 or the first to third axial force female threads 22m to 22o of the second nut 22 are present, Is wider than the distance between adjacent ones, but narrower than the first distance.

  In the present embodiment, the interval between the first loosening prevention bolt insertion hole 21a of the first nut 21 and the first axial force bolt insertion hole 21m is set such that the adjacent first axial force bolt insertion hole of the first nut 21 is inserted. A plurality of first to fourth locking bolt insertion holes 21a to 21d arranged between the hole 21m and the second axial bolt insertion hole 21n is narrower than an interval between adjacent ones. These intervals are configured similarly in the second nut 22.

  The locking bolt 25 includes a locking bolt shaft portion 25b (first shaft portion) having a locking external thread portion 25a (first male screw portion) formed on the outer peripheral surface thereof, and a locking bolt shaft portion 25b. And a larger diameter head 25c.

  In the locking bolt 25, the male screw part 25 a for locking is inserted through the first to twelfth locking bolt insertion holes 21 a to 21 l of the first nut 21, and the first to twelfth nuts of the second nut 22 are inserted. When the head 25c abuts on the first nut 21 in a state of being screwed into the female screws 22a to 22l for locking, the tip of the locking bolt shaft 25b does not protrude from the second nut 22 when the head 25c contacts the first nut 21. Is formed.

  The axial force bolt 26 includes an axial force bolt shaft portion 26b (second shaft portion) having an axial force external thread portion 26a (second external thread portion) formed on the outer peripheral surface. A concave portion 26c is formed on the distal end surface (the lower surface in FIGS. 3 to 8) of the axial force bolt shaft portion 26b. The axial force bolt 26 may be provided with a head having a larger diameter than the axial force bolt shaft portion 26b.

  The axial force bolt 26 is a washer on which the second nut 22 is mounted in a state where the axial force male screw portion 26a is screwed into the first to third axial force female screw portions 22m to 22o of the second nut 22. 24.

[Fixing process]
When fixing the gear shaft 15 to the main body 12 by the fixing device 16, first, the first nut 21 and the second nut 22 are set as shown in FIG. At this time, the first to third axial force bolt insertion holes 21m to 21o and the first to third axial force internal threads 22m to 22o are set at the same position.

  When setting the first nut 21 and the second nut 22, they are set in a state where there is a predetermined gap between them. As a step of providing the predetermined gap, the first nut 21 and the second nut 22 are screwed into a jig (not shown) having substantially the same shape as the gear shaft 15 in a state where the predetermined gap is provided. .

  Next, as shown in FIG. 6, after the twelve locking bolts 25 are inserted into the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21, for example, by hand, Each of the male screws 25a for locking the bolts of the locking bolt 25 is screwed to the first to twelfth female screws 22a to 22l of the second nut 22.

  Then, as shown in FIG. 7, after three axial force bolts 26 are inserted into the first to third axial force bolt insertion holes 21 m to 21 o of the first nut 21, for example, by hand, the three The male screw portions 26a for axial force of the axial bolt 26 are screwed to the first to third female screw portions 22m to 22o of the second nut 22. At this time, the three bolts 26 for axial force are screwed together so as not to project from the lower end of the second nut 22.

  By such a process, the first nut 21 and the second nut 22 are integrated with the predetermined gap. Then, after the first nut 21 and the second nut 22 are integrated, the fixing device 16 is removed from the jig.

  Next, the washer 24 is inserted through the shaft portion 15 a of the gear shaft 15 and is placed on the receiving portion 12 b of the main body 12. Thereby, the washer 24 is positioned.

  Then, as shown in FIG. 8, in a state where the first nut 21 and the second nut 22 are integrated, the female screw portion 22 p of the second nut 22 is screwed into the male screw portion 15 c of the gear shaft 15. Further, the female screw portion 21p of the first nut 21 is screwed to the male shaft screw portion 15c. As a result, the gear shaft 15 is temporarily fixed to the main body 12 (see FIG. 2).

  Next, with the gear shaft 15 temporarily fixed to the main body 12, the twelve locking bolts 25 are tightened in a predetermined order with a predetermined torque (for example, a torque of 34% of the final tightening torque). Temporarily tightening, and then temporarily tightening the twelve loosening prevention bolts 25 in a predetermined order with a predetermined torque (for example, a torque of 68% of the final tightening torque). The fixing bolt 25 is fully tightened in a predetermined order with a predetermined final tightening torque.

  The predetermined order is as follows: the locking bolt 25 screwed to the first locking female screw portion 22a, the locking bolt 25 screwed to the fifth locking female screw portion 22e, and the ninth locking screw. In the order of the locking bolts 25 screwed to the locking female screw portion 22i, the numbers of the first to twelfth locking female screw portions 22a to 22l are as follows. The order is tenth, third, seventh, eleventh, fourth, eighth, and twelfth. Note that the predetermined order can be appropriately changed.

  Next, the three axial force bolts 26 are temporarily tightened in order with a predetermined torque (for example, a torque of 34% of the final tightening torque), and then the three axial force bolts 26 are tightened. Temporarily tighten with a predetermined torque (for example, a torque of 68% of the torque for final tightening) (for example, 20 Nm) in order, and finally, three axial force bolts 26 are sequentially tightened for predetermined for final tightening. Fully tighten with torque. The order in which the three bolts 26 for axial force are temporarily tightened and fully tightened may be in any order.

  With the twelve loosening prevention bolts 25 fully tightened, the female screw portion 21p of the first nut 21 is pressed obliquely downward in the direction A1 against the male screw portion 15c of the gear shaft 15. Further, the female screw portion 22p of the second nut 22 is pressed against the male shaft screw portion 15c of the gear shaft 15 in an obliquely upward direction A2. As a result, a stronger pressure can be applied to the shaft male screw portion 15c than when the nut is pressed against the male screw portion only in one direction, and the fixing device 16 (the first nut 21 and the second nut 22) is loosened. The prevention power can be increased. Therefore, even when the gear shaft 15 is rotated, the first nut 21 and the second nut 22 are not loosened.

  In a state where each of the three axial force bolts 26 is fully tightened, three axial force bolts 26 are further provided while the lower end surfaces of the three axial force bolts 26 are in contact with the upper surface of the washer 24. Are rotated in the direction of moving downward. Thereby, a force (axial force) for the three axial force bolts 26 and the second nut 22 to move upward is generated. Due to the generation of the axial force, the female screw portion 22p of the second nut 22 is pressed against the male shaft screw portion 15c of the gear shaft 15. This makes it possible to increase the overall axial force as compared with a case where there is no axial force due to the three axial force bolts 26.

  Further, since a concave portion 26c is formed at the center of the lower surface of the axial force bolt 26 that contacts the upper surface of the washer 24, the outer peripheral portion of the lower surface of the axial force bolt 26 contacts the washer 24. Accordingly, the axial force bolt 26 is less likely to be loosened than a bolt having no concave portion and the center portion of the axial force bolt 26 abutting against the washer 24.

  In the present embodiment, each of the first to third axial force bolt insertion holes 21m to 21o of the first nut 21 and the first to third axial force internal thread portions 22m to 22o of the second nut 22 is the first Three nuts are formed at equal intervals (120 °) at a first interval in the circumferential direction of the nut 21. Further, in the present embodiment, the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21 and the first to twelfth locking female screw portions 22a to 22l of the second nut 22, respectively, A plurality (12) of the first nuts 21 are formed in the circumferential direction at an interval equal to or less than a second interval smaller than the first interval.

  With such a configuration, the axial force is generated by the three bolts 26 for axial force and those screwed thereto, and the force in the direction of locking is applied to the 12 bolts 25 for locking and the screwing thereof. Therefore, the axial force and the force in the locking direction can be made stronger in the locking direction as compared with the case where the same number of bolts and the screw that is screwed thereto generate the axial force and the locking force.

  In the present embodiment, the distance between the first loosening prevention bolt insertion hole 21 a of the first nut 21 and the first axial force bolt insertion hole 21 m is equal to the adjacent first axial force of the first nut 21. A plurality of first to fourth locking bolt insertion holes 21a to 21d disposed between the bolt insertion hole 21m and the second axial force bolt insertion hole 21n is narrower than an interval between adjacent ones.

  With this configuration, the distance between the first loosening prevention bolt insertion hole 21 a of the first nut 21 and the first axial force bolt insertion hole 21 m is equal to the adjacent first axial force bolt insertion hole of the first nut 21. The first to fourth loosening prevention bolt insertion holes 21a to 21d, which are arranged between the 21m and the second axial bolt insertion hole 21n, are looser than those having the same distance between adjacent ones. Many fixing bolts 25 can be arranged. Thereby, the force in the direction of preventing loosening can be increased.

  Next, the operation of the component storage and extraction device 1 of the present embodiment will be briefly described.

  First, when the metal ring W whose size data such as the circumference value has been measured after being manufactured in the previous process is supplied to the first component transfer device 5a provided on the outer peripheral side of the storage shelf 4, The component gripping device 8a of the first component transport device 5a grips the metal ring W. Next, the control device (not shown) calculates the rotation angle of the table 9 and the vertical position of the vertical movement device 7a from the position information of the component storage unit 3 that stores the metal ring W and the current position of the first component transfer device 5a. Calculate the moving distance. Then, the control device drives the table 9 and the vertical movement device 7a to move the component holding device 8a to a position facing the component storage unit 3 that stores the metal ring W.

  Next, the metal ring W is pinched and held by the component holding device 8a, and the storage in the component storage unit 3 is completed.

  The control device mutually exchanges information such as size data relating to the metal ring W stored in the component storage unit 3 by the first component transfer device 5a and position information of the component storage unit 3 in which the metal ring W is stored. Store them in association with each other.

  Next, when extracting the metal ring W stored in the component storage unit 3, this is performed by the second component transfer device 5b provided on the inner peripheral side of the storage shelf 4. In this case, the control device selects a metal ring W including information such as size data corresponding to a predetermined condition from a plurality of metal rings W stored in the storage shelf 4. Next, the control device is provided with the position information of the component storage unit 3 storing the metal ring W stored in association with the information such as the size data and the like on the inner peripheral side of the storage shelf 4. The rotation angle of the columnar member 6b (second component transfer device 5b) and the vertical movement distance of the vertical movement device 7b are calculated from the current position of the second component transfer device 5b. Then, the control device drives the rotation mechanism 11 and the vertical movement device 7b to move the component holding device 8b to a position facing the component storage unit 3 that stores the metal ring W.

  The procedure of extracting the metal ring W by the component gripping device 8b is completely opposite to the procedure of storing the metal ring W by the component gripping device 8a.

  When extracting the metal ring W by the component gripping device 8b, first, the metal ring W is held in a state where the component gripping device 8b faces the component storage unit 3.

  Next, the metal ring W is extracted from the component storage unit 3. The control device drives the rotating mechanism 11 in a state where the component gripping device 8b of the second component transport device 5b grips the metal ring W extracted as described above, and the position where the component gripping device 8b faces the passage 4a. The metal ring W is conveyed from the inner peripheral side to the outer peripheral side of the storage shelf 4 via the passage 4a.

  In the above embodiment, one fixing device 16 is provided with the bolts 25 and 26 facing upward, but the second component transporting device 5b is divided into a plurality of upper and lower parts to correspond thereto. A plurality of fixing devices 16 may be provided vertically. For example, the fixing device 16 arranged below may be arranged with the bolts 25 and 26 facing downward, in which case the locking bolt 25 and the axial force bolt 26 become invisible. Since the order of tightening the screws 25 for the locking bolt 25 and the bolt 26 for axial force is determined, it is necessary to distinguish between the locking bolt 25 and the bolt 26 for axial force.

  In the fixing device 16 embodying the present invention, since the shape of the bolt 25 for preventing loosening and the bolt 26 for axial force are different, even if the fixing device 16 is not visible, for example, by touching the downward fixing device 16 with a hand, the loosening is performed. The stop bolt 25 and the axial force bolt 26 can be distinguished. Therefore, the fixing by the fixing device 16 can be easily performed.

  In the above embodiment, the washer 24 is provided, but the washer 24 may not be provided. In this case, the tip of the axial force bolt 26 abuts on the receiving portion 12 b of the main body 12.

  In the above embodiment, the present invention is applied to the fixing device 16 for fixing the gear shaft 15, but the present invention can be applied to a fixing device for fixing various members (first members), and the various members are rotated. This is effective when the present invention is applied to an object that vibrates or that vibrates various members.

DESCRIPTION OF SYMBOLS 12 ... Body part (2nd member) 12a ... Opening, 15 ... Gear shaft (1st member), 15a ... Shaft part (shaft insertion part), 15c ... Shaft male screw part, 16 ... Fixing device, 21 ... 1st nut .., 21a to 21l... First to twelfth locking bolt insertion holes (first insertion holes), 21m to 21o... First to third axial force bolt insertion holes (second insertion holes), 22. .., 22a to 22l... First to twelfth female screws for locking (first female screw), 22m to 22o... First to third female screws for axial force (second female screw), 24. 25, a locking bolt (first bolt); 25a, a locking male thread (first male thread); 25b, a locking bolt shaft (first shaft); 26, an axial force bolt (Second bolt), 26a: Male screw part for axial force (second male screw part), 26b: Bolt shaft part for axial force (Second shaft part)

Claims (5)

A first member having a shaft portion having a shaft male screw portion formed on the outer peripheral surface is inserted into the opening formed in the second member so that the shaft male screw portion projects from the opening. A fixing device for fixing to the second member,
A first nut screwed into the male shaft thread portion and having a first insertion hole and a second insertion hole formed therethrough in the axial direction;
A first female screw portion and a second female screw portion which are screwed to a portion closer to the proximal end than the portion where the first nut of the shaft male screw portion is screwed and penetrate in the axial direction are formed. A second nut engaged with the nut;
A first shaft portion having an outer peripheral surface formed with a first male screw portion which is inserted through the first insertion hole of the first nut and is screwed to the first female screw portion of the second nut; A first bolt having a head larger in diameter than the shaft;
A second bolt having a second shaft portion having an outer peripheral surface formed with a second male screw portion that is inserted through the second insertion hole of the first nut and screwed into the second female screw portion of the second nut. When,
With
The first bolt has a head portion in a state where the first male screw portion is inserted through the first insertion hole of the first nut and screwed into the first female screw portion of the second nut. When abutting on the first nut, the tip of the first shaft portion is formed so as not to protrude from the second nut,
The second bolt is formed to have a length that abuts on a third member on which the second nut is mounted in a state where the second external thread is screwed into the second internal thread of the second nut. A fixing device, characterized in that: The fixing device according to claim 1,
The fixing device according to claim 1, wherein the third member is configured by a ring-shaped washer through which the shaft portion is inserted and positioned in contact with the second member, and on which the second nut is mounted. The fixing device according to claim 1 or 2,
Each of the second insertion hole of the first nut and the second female screw portion of the second nut is formed in a plurality at intervals of a first interval or more in the circumferential direction of the first nut and the second nut. And
Each of the first insertion hole of the first nut and the first female screw portion of the second nut is a second narrower than the first interval in a circumferential direction of the first nut and the second nut. A fixing device, wherein a plurality of the fixing devices are formed at intervals smaller than the interval, and the number of the second insertion holes of the first nut and the number of the second female threads of the second nut are larger than each. The fixing device according to claim 3,
The distance between the adjacent first insertion holes and the second insertion holes of the first nut is a plurality of adjacent first insertion holes arranged between the adjacent second insertion holes of the first nut. A fixing device characterized by being narrower than an interval between the two. The fixing device according to any one of claims 1 to 4,
The fixing device according to claim 1, wherein the second bolt has a base end on the head side having a diameter equal to or smaller than a diameter of the second shaft, and a concave portion formed on a distal end surface.