JP4256303B2 - Fastening parts and preload transmission device - Google Patents

Description

  The present invention relates to a fastening screw with a loosening canceller, a fastening nut, and a preload transmission device, and more particularly, loosening with the passage of time after being fully screwed in and tightened until a fastening force is applied to a member to be fastened. In order to prevent this, the fastening torque is generated based on the generated ultrasonic vibration and the friction force is applied to the fastening target member that is in contact with the fastening force as a pre-pressure to propel it in the screwing direction. The present invention relates to a fastening screw and a fastening nut that are self-fastened to the fastening target member, and a preload transmission device that is directly used for fastening until the jaw portion is sufficiently in contact with the fastening target member.

  Screws, bolts, and nuts are widely used as member joining means. Here, as a means for tightening the screw, a screw with a plus or minus character is engraved on the head of the screw, and a screwdriver with a corresponding tip is applied to the stamp so that the screw is tightened on the screw. In general, when a member is joined using a bolt and a nut, a torque for tightening the bolt or nut with a wrench, spanner, or the like is applied.

  On the other hand, as an actuator capable of exhibiting a high rotational torque, an ultrasonic motor disclosed in Non-Patent Document 1, for example, that can obtain a high static torque particularly when the rotor is stationary is known.

Kentaro Nakamura, Minoru Kurosawa, Sadayuki Ueha, “Characteristics of a Hybrid Transducer-Type Ultrasonic Motor”, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol.38, No.3, May 1991, p.188-193.

  However, in order to tighten the screws, bolts and nuts, a tool such as a predetermined driver, wrench, spanner, etc. is required. Space is required, and there is a problem that fastening in a narrow part is difficult. In addition, even if sufficient space was secured at the time of fastening, as a result of assembling other parts that make up the peripheral members after that, there was no space around the screw, bolt or nut, and re-fastening work could not be performed. .

  Note that the screw, bolt and nut after fastening may be loosened due to vibration of the machine after operating the machine for a long time, for example, when used in a machine having vibration, etc. Therefore, the screws, bolts and nuts used in such a situation need to be periodically inspected for looseness.

  In order to solve the above-described problems, the inventor of the present application uses, for example, a piezoelectric actuator used as a stator of an ultrasonic motor disclosed in Non-Patent Document 1 to give a fastening torque of a screw, bolt, or nut. Friction resistance force between screw thread and screw hole when screw, bolt or nut is subjected to mechanical vibration in a predetermined direction of the same ultrasonic region frequency as the mechanical vibration applied to the rotor of the ultrasonic motor As a result of experiments, it has been found through experiments that the tightening torque is generated by using the guide regulation, and a fastening screw, a fastening nut, and a preload transmission device for joining arbitrary fastening materials using screws, bolts, or nuts have been created.

  Here, the main objects to be solved by the present invention are as follows.

  That is, the first object of the present invention is to provide a fastening screw or a fastening nut with a piezoelectric element and screw it in until it is sufficiently in contact with the fastening target member. To provide a fastening screw and nut with a slack eliminating device and a preload transmitting device capable of generating a fastening torque when the fastening force is applied and self-fastening to prevent loosening over time. Is.

  The second object of the present invention is to transmit an appropriate preload from the outside to the fastening screw or the fastening nut when the fastening force acting on the jaw of the fastening screw or the fastening nut provided with the piezoelectric element is insufficient. Thus, the present invention provides a fastening screw with a slack eliminating device, a fastening nut, and a preload transmission device that can generate a fastening torque.

  A third object of the present invention is to employ a Langevin vibrator or a traveling wave type ultrasonic motor used in an ultrasonic motor as a piezoelectric element provided in a fastening screw or a fastening nut, and to apply ultrasonic vibration. It is an object of the present invention to provide a fastening screw with a slack eliminating device, a fastening nut, and a preload transmitting device capable of controlling the amplitude and phase difference and generating a fastening torque in a predetermined direction.

  Other objects of the present invention will become apparent from the specification, drawings, and particularly the description of each claim.

  First, in the fastening screw of the present invention, the loosening canceller on the fastening screw head is extrapolated to an attachment screw rod screwed in the center of the upper end surface of the fastening screw head, and the super screw is applied in accordance with application of a predetermined AC voltage to the upper end surface of the fastening screw head. Fastening is achieved by including a ring-shaped piezoelectric element portion that generates sonic vibrations, and a piezoelectric element holding nut that is screwed onto the upper end of the mounting screw rod and sandwiches the piezoelectric element portion with the upper end surface of the fastening screw head. The characteristic means of being integrally mounted on the screw head is taken.

  Further, in the fastening nut of the present invention, the slack eliminating device on the fastening nut is attached to the ring-shaped piezoelectric element portion that generates ultrasonic vibrations when a predetermined alternating voltage is applied and the entire length of the penetrating protruding end of the fastening bolt. A fastening nut 螺 which is screwed into the inner female screw hole of the screw cylinder part, is in contact with the member to be fastened and is integrally formed at the lower end of the attachment screw cylinder part, and is mounted by extrapolating the piezoelectric element part to the attachment screw cylinder part The characteristic constituent means is provided.

  On the other hand, in the preload transmitting device of the present invention, the preload receiving portion that receives external force in the screwing direction from the outside and the pressing end surface facing the upper end surface of the head of the fastening screw, the fastening nut, or the piezoelectric element portion holding nut are brought into butt contact and preloaded. A preload transmitting portion for transmitting an external force applied to the receiving portion to the fastening screw or the fastening nut, a bearing inner ring fixed to the outer peripheral surface of the preload transmitting portion and rotating integrally with the preload transmitting portion, and the bearing inner ring And a bearing having a bearing outer ring fixed to the inner peripheral surface of the preload receiving portion and rotating outside via the rolling element.

  More specifically, in order to solve the problem, the present invention achieves the above-mentioned object by adopting a new characteristic configuration means ranging from the superordinate concept listed below to the subordinate concept. .

  That is, the first feature of the fastening screw according to the present invention is to prevent loosening with the passage of time after the fastening screw head jaw part is sufficiently in contact with the fastening target member and screwed in until the fastening force is applied, and then the fastening is completed. In addition, a fastening torque is generated that acts in a screwing direction by applying a frictional resistance force to a fastening target member that is in contact with the fastening force as a pre-pressure based on the generated ultrasonic vibration, and the fastening target is generated by the fastening torque. A fastening screw with a slack eliminating device that self-fastens the member. The slack eliminating device is externally attached to a mounting screw rod screwed in the center of the upper end surface of the fastening screw head, and a predetermined AC voltage is applied to the upper end surface of the fastening screw head. Accordingly, an annular ring-shaped piezoelectric element portion that generates the ultrasonic vibration and a piezoelectric element portion holding nut that is screwed into the upper end surface of the mounting screw rod and sandwiches the piezoelectric element portion into the upper end surface of the fastening screw head. And it makes integrally capped on the fastening screw head, in the configuration adopting the fastening threaded slack eliminating device.

  A second feature of the fastening screw of the present invention is that when the piezoelectric element portion according to the first feature of the fastening screw of the present invention uses the rotation axis of the screw in a predetermined rotation direction as the z-axis of the xyz orthogonal coordinate system. , A flexural vibration element in the pitch direction for exciting the flexural vibration in the pitch direction with the y axis as the pitch axis, and a flexural vibration in the roll direction for exciting the flexural vibration in the roll direction with the x axis orthogonal to the pitch axis as the roll axis. Piezoelectric elements are stacked with a spacer nut interposed between them and screwed into the mounting screw rod, and the pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element each have a predetermined amplitude. And a phase difference between the two, a loose solution that employs a Langevin vibrator configured to be able to apply the AC voltage so that the fastening torque is in a predetermined rotational direction. In the configuration adoption of the vessel with fastening screws.

  A third feature of the fastening screw of the present invention is that the mounting screw rod in the second feature of the fastening screw of the present invention is replaced with the upper end surface of the fastening screw head instead of screwing the lower end into the center of the upper end surface of the fastening screw head. It is in the configuration adoption of a fastening screw with a slack eliminating device, which is formed by melting the lower end in the center and integrally fixing it.

  A fourth feature of the fastening screw according to the present invention is that the loosening canceller in the second or third feature of the present invention fastening screw replaces the spacer nut with a spacer collar at an appropriate place in the middle of the mounting screw rod. Is formed by using a fastening screw with a slack eliminating device.

  A fifth feature of the fastening screw of the present invention is that the loosening canceler in the second, third or fourth feature of the fastening screw of the present invention replaces the piezoelectric element portion holding nut at the upper end of the mounting screw rod. The present invention employs a configuration of a fastening screw with a slack eliminating device formed integrally with a mounting screw rod head.

  The sixth feature of the fastening screw of the present invention is that the fastening screw head and the piezoelectric element portion holding nut in the second, third, fourth or fifth feature of the fastening screw of the present invention are screwed on the outer peripheral surface portion thereof. When screwing itself into a member to be fastened, or when screwing the piezoelectric element portion holding nut onto the mounting screw rod and sandwiching the piezoelectric element portion together, a pressure for tightening torque is externally applied. The present invention employs a configuration of a fastening screw with a slack eliminating device having a flat surface-shaped portion that forms ridge angles on both sides with appropriate ridge angles.

  According to a seventh feature of the fastening screw of the present invention, the fastening screw head and the piezoelectric element portion holding nut according to the first, second, third, fourth, fifth or sixth feature of the fastening screw of the present invention described above, In the configuration of the fastening screw with a slack eliminating device, the female screw mark is formed in the center of the upper end surface of the screw so as to straddle the female screw hole.

  The eighth feature of the fastening screw of the present invention is to prevent loosening with the passage of time after the fastening screw head jaw portion is sufficiently in contact with the fastening target member and screwed in until the fastening force acts, Based on the generated ultrasonic vibrations, a fastening torque is generated that acts in a screwing direction by applying a frictional resistance force to the fastening target member that is in contact with the fastening force as a preload, and the fastening target member A self-fastening fastening screw with a slack eliminating device, which generates a traveling wave elastic bending wave that travels on a concentric circle of the fastening screw head jaw when a predetermined AC voltage is applied to the upper end surface of the fastening screw head. A ring-shaped traveling wave type ultrasonic motor that generates the ultrasonic vibration in a predetermined direction based on the traveling wave elastic bending wave on the jaw portion of the fastening screw head as a piezoelectric element. That, in the configuration adoption of the fastening screws with a loose eliminating device.

  According to a ninth feature of the fastening screw of the present invention, the fastening screw head according to the first, second, third, fourth, fifth, sixth, seventh, or eighth feature of the fastening screw of the present invention is the fastening screw. The present invention employs a configuration of a fastening screw with a slack eliminating device that includes a friction material fixed on the jaw portion that comes into contact with a target member.

  In addition, the first feature of the fastening nut of the present invention is that the fastening jaw is screwed into the fastening bolt until the head jaw portion of the fastening bolt is sufficiently in contact with the fastening target member and the fastening force is applied, and the fastening is completed. In order to prevent the loosening that accompanies, a fastening torque that causes frictional force to act on the fastening target member that is brought into contact with the fastening force as a pre-pressure based on the generated ultrasonic vibration and propels the fastening bolt in the screwing direction is provided. A fastening nut with a slack eliminating device that is generated and screwed into the penetrating protruding end of the fastening bolt by the fastening torque and is self-fastened to the fastening bolt, and the slack eliminating device is applied with application of a predetermined AC voltage. The ring-shaped piezoelectric element portion that generates the ultrasonic vibration and the inner female screw hole of the mounting screw cylinder portion are screwed to the entire length of the penetrating projecting end of the fastening bolt so as to come into contact with the fastening target member and the mounting screw. At the bottom of the tube A fastening nut flange portion for mounting by extrapolating the piezoelectric element to the mounting screw tube portion as well as the body formed, comprises a, in the configuration adopting the fastening nut loosening eliminating device.

  According to a second feature of the fastening nut of the present invention, the loosening canceler according to the first feature of the fastening nut of the present invention includes a piezoelectric element portion holding nut that sandwiches the piezoelectric element portion with the fastening nut flange portion. A pitch with the y-axis as the pitch axis when the piezoelectric element portion is screwed into the upper end of the external screw thread of the mounting screw cylinder and the rotation axis of the nut in a predetermined rotation direction is the z-axis of the xyz orthogonal coordinate system. The mounting screw cylinder includes a pitch direction flexural vibration piezoelectric element that excites a flexural vibration in a direction, and a roll direction flexural vibration piezoelectric element that excites a roll direction flexural vibration having an x axis orthogonal to the pitch axis as a roll axis. Spacer nuts screwed into the external male screw are stacked in between, and the pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element have a predetermined amplitude and phase difference, respectively. It generates a wave oscillation, the fastening torque is adopted Langevin transducer which is capable of applying constructed of the AC voltage to be a predetermined rotational direction, in the configuration adopting the fastening nut loosening eliminating device.

  According to a third feature of the fastening nut of the present invention, the mounting screw cylinder portion according to the second feature of the fastening nut of the present invention is formed with a predetermined female screw corresponding to the fastening bolt over the entire inner circumference. The piezoelectric element portion is externally inserted so as to be separated from the outside by a predetermined distance and arranged on the outer periphery, and is integrally formed with one of the spacer nut and the piezoelectric element portion holding nut on the outside, while the integrally formed fastening nut In place of the flange portion, a fastening nut is screwed and arranged on the outside. On the other hand, a male screw is screwed over the entire outer peripheral length and the separated nut of the spacer nut and the piezoelectric element portion holding nut is screwed with the fastening nut. The construction of a fastening nut with a slack eliminating device is formed.

  The fourth feature of the fastening nut of the present invention is that the fastening jaw is screwed through the fastening bolt until the head jaw portion of the fastening bolt is sufficiently in contact with the fastening target member and a fastening force is applied, and then loosened with time. In order to prevent this, a fastening torque is generated based on the generated ultrasonic vibration to cause the fastening bolt to propel in the screwing direction by applying a frictional resistance force to the fastening target member that is in contact with the fastening force as a pre-pressure. A fastening nut with a slack eliminating device that is screwed into the projecting protruding end of the fastening bolt by the fastening torque and is self-fastened to the fastening bolt, wherein the slack eliminating device is tightened with application of a predetermined AC voltage. A traveling wave elastic bending wave traveling in the circumferential direction around the fastening bolt is generated on the upper end surface of the nut, and the ultrasonic vibration in a predetermined direction based on the traveling wave elastic bending wave is generated on the lower end surface of the fastening nut. That consists comprises a traveling wave type ultrasonic motor vibrator HanawaTamaki shape as a piezoelectric element, in the configuration adopting the fastening nut loosening eliminating device.

  The fifth feature of the fastening nut of the present invention is that the fastening nut according to the first, second, third or fourth feature of the fastening nut of the present invention is fixed to the lower end surface of the fastening nut contacting the member to be fastened. The present invention employs a configuration of a fastening nut with a slack eliminating device that includes the friction material.

  On the other hand, a first feature of the device of the present invention is that the piezoelectric device according to the first to ninth features of the fastening screw of the present invention and the first to fifth features of the fastening nut of the present invention are provided. When fastening the fastening screw with a slack eliminating device or fastening nut configured to generate fastening torque based on ultrasonic vibration, the head jaw of the fastening screw or the lower end surface of the fastening nut is in sufficient contact with the member to be fastened. A preload transmission device for transmitting a preload in a screwing direction applied from the outside to the fastening screw or the fastening nut, applied until the fastening force can be used as a preload, The preload receiving portion that receives external force in the screwing direction from the outside, and the pressing end surface facing the upper end surface of the head of the fastening screw, the fastening nut, or the piezoelectric element portion holding nut, and the preload receiving portion. A preload transmitting portion that transmits the external force applied to the fastening screw or the fastening nut, a bearing inner ring that is fixed to an outer peripheral surface of the preload transmitting portion and rotates integrally with the preload transmitting portion, and a bearing inner ring And a bearing having a bearing outer ring that rotates around the rolling element and is fixed to the inner peripheral surface of the preload receiving portion.

  According to the present invention, the conventional screw, wrench, spanner, etc. can be used in a narrow space by mounting the piezoelectric element used for the stator of the ultrasonic motor on the fastening screw or the fastening nut of the present invention. Without using preload applied from the outside or the ultrasonic vibration generated by using the fastening force with the member to be fastened. By self-fastening the fastening nut, it becomes possible to prevent loosening due to the passage of time after the fastening is completed, and it is easy to use it without using tools etc. against loosening due to vibration of the fastening target member such as a machine. Re-engagement is possible.

  Further, by adopting a Langevin vibrator as the piezoelectric element provided in the fastening screw or the fastening nut of the present invention, it becomes possible to generate a high-output fastening torque, and the piezoelectric element and the roll direction flexural vibration piezoelectric element. By adopting the flexural vibration piezoelectric element, the amplitude and phase difference of the vibration to be excited can be controlled, and a fastening torque in a predetermined rotational direction can be generated.

  Furthermore, by integrally configuring the loosening device that sandwiches the piezoelectric element, the structure of the fastening screw or the fastening nut can be simplified, and the outer peripheral surface portion of the fastening screw head and the piezoelectric element holding nut is flat. By using the surface-shaped portion, it is possible to easily assemble the slack eliminating device having the piezoelectric element.

  On the other hand, when a vibrator of a traveling wave type ultrasonic motor is adopted as a piezoelectric element mounted on a fastening screw or a fastening nut, the size can be reduced by a simple structure of the piezoelectric element portion, and a jaw contacting a member to be fastened. By disposing the friction material on the part, it is possible to effectively generate a sufficient fastening torque.

  In addition, when the preload applied from the outside is transmitted to the fastening screw or the fastening nut of the present invention via the preload transmitting device of the present invention, the rotation of the fastening screw or the fastening nut causes the bearing to idle. Since the preload receiving portion is configured not to follow this rotation, an appropriate preload can be applied without hindering the rotation of the fastening screw or the fastening nut, and the internal stress acts without being fully screwed into the fastening target member. Even before the self-fastening is possible, the fastening screw or the fastening nut can be fastened by generating a fastening torque without using a tool such as a screwdriver, a wrench or a spanner.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings in order of fastening screw examples 1 to 5, fastening nut examples 1 to 5, and a preload transmission device example.

(Fastening screw example 1)
FIG. 1 is a view showing a configuration of a main part of a fastening screw α1 of a fastening screw example 1 which is an embodiment example of the fastening screw according to the present invention, together with its usage, and FIG. FIG. 2B is a perspective view showing assembly of the fastening screw example 1, and FIG. 2C is a vertical sectional view showing the fastened fastening screw example 1 in a partial cross section. It is the figure which abbreviate | omitted and showed female-type stamp 12e, 13e.

  As shown in FIGS. 5A, 5B, and 5C, the fastening screw α1 according to the fastening screw example 1 generates a fastening torque propelled in the screwing direction based on the generated ultrasonic vibration. The loosening canceller 1 of the fastening screw α1 is configured to be self-fastened by a fastening torque, and is externally attached to an attachment screw rod 14 screwed in the center of the upper end surface 12a of the fastening screw head 12, and a predetermined AC voltage is applied to the upper end surface 12a. A ring-shaped piezoelectric element portion 11 that generates ultrasonic vibration upon application, and a piezoelectric element portion holding nut 13 that is screwed onto the upper end of the mounting screw rod 14 and sandwiches the piezoelectric element portion 11 with the upper end surface 12a of the fastening screw head 12. , And is integrally attached onto the fastening screw head 12.

  At this time, for example, when the rotation axis of the fastening screw α1 in the predetermined rotation direction is the z axis of the xyz orthogonal coordinate system, the piezoelectric element unit 11 excites flexural vibration in the pitch direction with the y axis as the pitch axis. A pitch direction flexural vibration piezoelectric element 11a and a roll direction flexural vibration piezoelectric element 11b that excites a flexural vibration in the roll direction with the x axis orthogonal to the pitch axis as a roll axis are screwed onto the mounting screw rod 14. The spacer nuts 11c penetrated are stacked with an intervening layer therebetween.

  As a result, the piezoelectric element unit 11 generates ultrasonic vibrations having a predetermined amplitude and phase difference between the pitch direction flexural vibration piezoelectric element 11a and the roll direction flexural vibration piezoelectric element 11b, and the fastening torque is predetermined. It can be configured as a Langevin vibrator configured so that an AC voltage can be applied in the rotational direction.

  In addition, the ultrasonic vibration that vibrates between the pitch direction flexural vibration piezoelectric element 11a and the roll direction flexural vibration piezoelectric element 11b is configured to vibrate with a phase difference of 90 degrees, for example, thereby tightening the fastening screw α1. The fastening torque in the rotational direction can be generated.

  Further, the fastening screw head 12 and the piezoelectric element part holding nut 13 are screwed into the fastening target member 21 when the fastening screw α1 itself is screwed, or the piezoelectric element part holding nut 13 is screwed to the mounting screw rod 14 to fix the piezoelectric element part 11. When sandwiched together, the outer peripheral surface portions 12b and 13b have flat surface-shaped portions 12c and 13c formed on both sides of the outer peripheral surface portions 12b and 13b, respectively. It is good to make it.

  In order for the fastening screw α1 including the piezoelectric element portion 11 to generate a fastening torque, for example, the jaw portion 12d of the fastening screw head 12 and the surface of the fastening target member 21 and the screw holes 2a and the screw holes of the fastening target member 21 are used. For this purpose, it is necessary that a strong preload acts on the fastening screw head 12 in the propulsion direction by fastening the fastening screw α1.

  Therefore, the fastening screw α1 is screwed in until the jaw portion 12d is sufficiently in contact with the fastening target member 21 as shown in FIG. In some cases, due to this screwing, a fastening force in the screwing direction of the screw thread 2a of the screw portion 2 to the fastening target member 21 acts on the fastening screw head 12, so that the fastening screw head 12 has a fastening force in the screwing direction. Works.

  Therefore, since this fastening force acts as a preload for the fastening screw α1 that functions as a stator of the ultrasonic motor and the fastening target member 21 that can be regarded as a rotor, a special pre-fastening is required for re-fastening. Without the need for pressure, a fastening torque is generated that is propelled in the screwing direction by applying a frictional resistance force to the fastening target member 21 in contact with the fastening target member 21 based on the ultrasonic vibration generated in the piezoelectric element portion 11. Thus, self-fastening such as preventing loosening of the fastening screw α1 over time can be performed.

  On the other hand, the fastening screw α1 is not sufficiently screwed into the fastening target member 21, so that the fastening force cannot be made a pre-pressure, and a sufficient frictional resistance force does not act between the fastening screw α1 and the fastening target member 21. Sometimes, a preload in the screwing direction is separately applied from the outside to the upper end surface 13a of the piezoelectric element holding nut 13 to generate a fastening torque on the contact surface between the screw thread 2a and the fastening target member 21. It becomes possible and can be fastened without using a driver or the like.

  At this time, the fastening screw α1 is not limited to the one that is fastened by applying preload from the outside. For example, the upper end surface 12a of the fastening screw head 12 before the fastening screw α1 is assembled and the top portion after the assembly. By forming a female stamp 12e or 13e corresponding to the tip of the predetermined driver on one or both of the upper end surface 13a of the piezoelectric element portion holding nut 13 to be a predetermined driver or the like without applying a preload. It is also possible to fasten with a tool.

(Fastening screw example 2)
Next, FIG. 2 is a vertical sectional view showing the configuration of the main part of the fastening screw α2 of the fastening screw example 2 which is another embodiment of the fastening screw of the present invention, together with its usage. In the following drawings used in the description of the present embodiment, the same or equivalent components as those shown in FIG. 1 are assigned the same reference numerals, and detailed descriptions of the components are omitted. And

  As shown in the figure, the fastening screw α2 according to the present fastening screw example 2 is used when the mounting screw rod 14 is screwed into the center of the upper end surface 12a of the fastening screw head 12 of the fastening screw α1 according to the fastening screw example 1 described above. Instead, the fastening screw head 15 includes a fastening screw head 15 with a screw rod which is integrally fixed by welding a lower end 14b at the center of the upper end surface 12a of the fastening screw head 12. For example, the spacer nut 11c and the piezoelectric element portion holding nut 13 are screwed onto the surface corresponding to 12a while alternately sandwiching the piezoelectric elements 11a and 11b, and are configured to be integrally sandwiched as the slack eliminating device 1. .

(Fastening screw example 3)
Next, FIG. 3 is a vertical cross-sectional view showing the configuration of the main part of the fastening screw α3 of the fastening screw example 3 which is another embodiment of the fastening screw of the present invention, together with its usage.

  As shown in the figure, the fastening screw α3 according to the present fastening screw example 3 has a loosening canceller 1 in place of the spacer nut 11c of the fastening screw α1 according to the fastening screw example 1 as appropriate in the middle of the mounting screw rod 14. The spacer flange portion 16 is formed integrally with the spacer flange portion 16, and the spacer flange portion 16 has a fastening screw head 12 and a piezoelectric element portion holding nut 13 with both upper end surfaces sandwiched between the piezoelectric elements 11a and 11b, respectively. It is configured to be screwed together so as to be integrally sandwiched as the loosening device 1.

(Fastening screw example 4)
FIG. 4 is a vertical sectional view showing the configuration of the main part of the fastening screw α4 of the fastening screw example 4 which is another embodiment of the fastening screw according to the present invention, together with its usage.

  As shown in the figure, the fastening screw α4 according to the present fastening screw example 4 is configured such that the loosening canceller 1 replaces the piezoelectric element portion holding nut 13 of the fastening screw α1 according to the fastening screw example 1 with a mounting screw rod 14. The mounting screw rod head 17 is formed integrally with the upper end 14a. The mounting screw rod head 17 is, for example, screwed into the spacer nut 11c and the fastening screw head 12 while sandwiching the piezoelectric elements 11a and 11b alternately. The slack eliminating device 1 is configured to be sandwiched integrally.

(Fastening screw example 5)
Further, FIG. 5 is a vertical sectional view showing the configuration of the main part of the fastening screw α5 of the fastening screw example 5 which is another embodiment of the fastening screw according to the present invention, together with its usage.

  As shown in the drawing, the fastening screw α5 according to the present fastening screw example 5 includes a pitch direction flexural vibration piezoelectric element 11a configured as the Langevin vibrator of the fastening screw examples 1 to 4 and the roll direction. In place of the flexural vibration piezoelectric element 11b and the spacer nut 11c, a traveling wave elastic bending wave that travels concentrically on the fastening screw head 12 jaw 12d when a predetermined AC voltage is applied to the upper end surface 12a of the fastening screw head 12 in the loosening canceller 1. And a vibrator 11d of a ring-shaped traveling wave type ultrasonic motor that generates ultrasonic vibrations in a predetermined direction based on a traveling wave elastic bending wave on the jaw 12d of the fastening screw head 12 as a piezoelectric element. Configured.

  At this time, the fastening screw head 12 includes, for example, a friction material 18 in which a predetermined number of annular grooves around the screw portion 2 are formed on the jaw portion 12d in contact with the fastening target member 21 to increase the frictional resistance. The traveling wave elastic bending wave generated by the fastening screw α5 by the friction material 18 can be effectively transmitted to the fastening target member 21 and the fastening torque can be generated.

  Note that the friction material 18 is provided on the jaw portion 12d of the fastening screws α1 to α4, and, for example, the supersonic wave generated based on the standing wave transmitted on the jaw portion 12d as well as the thread 2a of the screw portion 2. You may enable it to generate | occur | produce a rotational torque effectively from a sonic vibration.

  In addition, the fastening screws α1 to α5 in the present embodiment are not limited to screws that are screwed into the fastening target member 21, and for example, are screwed into a predetermined nut to connect a plurality of fastening target members 21, 21,. It may be a bolt that is inserted and tightened, and may be configured by adopting the loosening canceller 1 shown in the above fastening screw examples 1 to 5 on the upper end surface 12a of the fastening screw head 12 of this bolt.

  Therefore, the bolt constituted by mounting the slack eliminating device 1 also acts at the time of fastening to the slack eliminating device 1 that functions as a stator of the ultrasonic motor, similarly to the fastening screws α1 to α5. A predetermined ultrasonic vibration is generated using a fastening force or a pre-pressure separately applied from the outside, and a fastening torque can be generated based on the ultrasonic vibration.

(Fastening nut example 1)
FIG. 6 is a diagram showing a configuration of a main part of the fastening nut β1 of the fastening nut example 1 which is an embodiment of the fastening nut of the present invention, together with its usage, and FIG. 6 (a) shows the appearance of the fastening nut example 1. FIG. 7B is a perspective view showing assembly of the fastening nut example 1, and FIG. 7 is a vertical sectional view showing the fastening nut β1 fastened in the fastening nut example 1 in cross section. It is.

  As shown in FIGS. 6A, 6B, and 7, the fastening nut β1 according to the fastening nut example 1 has a fastening force with the head jaw portion 22a of the fastening bolt 22 sufficiently in contact with the fastening target members 23 and 24. After the fastening bolt 22 is screwed until the fastening operation is completed, the fastening target member 23 is brought into contact with the fastening force as a preload based on the generated ultrasonic vibration in order to prevent loosening with time. A fastening torque is generated that causes frictional force to act between them and propelling the fastening bolt 22 in the screwing direction, and is screwed into the penetrating projecting end 22b of the fastening bolt 22 and self-fastened to the fastening bolt 22 by this fastening torque. It is configured as follows.

  Here, the fastening nut β1 is, as the loosening canceller 3, attached to the ring-shaped piezoelectric element portion 31 that generates ultrasonic vibration upon application of a predetermined alternating voltage, and the entire length of the penetrating protruding end 22b of the fastening bolt 22. The inner female screw hole 3a of the cylindrical portion 34 is screwed together so as to be in contact with the fastening target member 23 and integrally formed at the lower end of the mounting screw cylindrical portion 34, and the piezoelectric element portion 31 is extrapolated and placed on the mounting screw cylindrical portion 34. A mounting nut 35.

  Further, the loosening canceller 3 includes, for example, a piezoelectric element portion holding nut 33 that sandwiches the piezoelectric element portion 31 with the fastening nut flange portion 32, and is screwed onto the upper end of the external threaded screw 3b of the mounting screw cylinder portion 34. For example, when the rotation axis in the predetermined rotation direction of the fastening nut β1 is set to the z axis of the xyz orthogonal coordinate system, the flexural vibration in the pitch direction that excites the flexural vibration in the pitch direction with the y axis as the pitch axis. A spacer in which a piezoelectric element 31a and a roll-direction flexural vibration piezoelectric element 31b that excites a flexural vibration in the roll direction with the x-axis orthogonal to the pitch axis as a roll axis are screwed into the external thread 3b on the mounting screw cylinder portion 34. The nuts 31c are stacked in between.

  As a result, the piezoelectric element unit 31 generates ultrasonic vibration having a predetermined amplitude and phase difference between the pitch direction flexural vibration piezoelectric element 31a and the roll direction flexural vibration piezoelectric element 31b. It can be configured as a Langevin vibrator configured so that an AC voltage can be applied in the rotational direction.

  In addition, the ultrasonic vibration that is oscillated between the pitch direction flexural vibration piezoelectric element 31a and the roll direction flexural vibration piezoelectric element 31b is configured to vibrate with a phase difference of 90 degrees, for example, thereby tightening the fastening nut β1. The fastening torque in the rotational direction can be generated.

  In order for the fastening nut β1 provided with the piezoelectric element portion 31 to generate the fastening torque, for example, the lower end surface 32d of the fastening nut flange 32 and the surface of the fastening target member 31, and the female screw hole 3a and the fastening bolt 22 The frictional resistance acting between the screw threads must be high, and for that purpose, it is necessary that a strong preload acts on the fastening nut β1 in the propulsion direction by fastening.

  Therefore, when the fastening nut β1 includes the piezoelectric element portion 31 and is screwed and fastened until the head jaw portion 22a of the fastening bolt 22 sufficiently contacts the fastening target member 24, the fastening nut β1 Since the fastening nut β1 acts on the fastening bolt 22 in the screwing direction on the fastening nut β1, the fastening force in the screwing direction acts on the fastening nut β1.

  Therefore, this fastening force acts as a preload for the fastening nut β1 that functions as a stator of the ultrasonic motor and the fastening bolt 22 that can be regarded as a rotor. Without the need for a frictional force between the fastening bolt 22 and the fastening target member 23 that are in contact with each other based on the ultrasonic vibration generated in the piezoelectric element portion 31 to generate a fastening torque, It is possible to perform self-fastening, such as preventing loosening of the fastening nut β1 with the passage of time.

  On the other hand, when the fastening nut β1 is not sufficiently screwed into the fastening bolt 22 and the fastening force cannot be pre-pressed, and a sufficient frictional resistance force does not act between the fastening nut β1 and the fastening bolt 22, By separately applying a preload in the screwing direction to the upper end surface 33a of the piezoelectric element holding nut 33 from the outside, it is possible to generate a fastening torque on the contact surface between the female screw hole 3a and the fastening bolt 22. It can be fastened without using a driver or the like.

  At this time, the fastening nut β1 is not limited to the one that is fastened by applying preload from the outside. For example, the lower end surface 32d of the fastening nut flange 32 of the fastening nut β1 and the piezoelectric element portion holding nut The outer peripheral surface portions 32b and 33b of the upper end surface 33a of the 33 are formed in a hexagonal shape or the like that fits in correspondence with the shape of a predetermined wrench or spanner, etc., so that they are fastened with a predetermined tool without being given preload. It is also possible to do.

(Fastening nut example 2)
Next, FIG. 8 is a vertical cross-sectional view showing the configuration of the main part of the fastening nut β2 of the fastening nut example 2 which is another embodiment of the fastening nut of the present invention together with its usage. In addition, in each drawing used in the following description of the present embodiment, the same or equivalent components as those shown in FIGS. 6 and 7 are assigned the same reference numerals, and detailed descriptions of the components are as follows. Shall be omitted.

  As shown in the figure, the fastening nut β2 according to the present fastening nut example 2 replaces the configuration of the mounting screw cylinder portion 34 of the fastening nut β1 according to the fastening nut example 1 with the configuration of the integrally formed mounting nut 35. A predetermined female screw hole 3a corresponding to the fastening bolt 22 is formed over the entire inner peripheral length, and the piezoelectric element portion 11 is externally inserted so as to be spaced apart from the outer periphery by a predetermined distance and is integrally formed with the spacer nut 31c on the outer side. On the other hand, the male nut 3b is formed so that the fastening nut flange 32 is screwed and arranged on the outside, and the piezoelectric element portion holding nut 33 and the fastening nut flange 32 which are separately formed over the entire outer periphery are screwed together. Thus, the spacer flange 36 is configured.

(Fastening nut example 3)
Next, FIG. 9 is a vertical cross-sectional view showing the configuration of the main part of the fastening nut β3 of the fastening nut example 3 which is another embodiment of the fastening nut of the present invention, together with its usage.

  As shown in the figure, the fastening nut β3 according to the present fastening nut example 3 is obtained by replacing the configuration of the mounting screw cylinder portion 34 of the fastening nut β1 according to the fastening nut example 1 with the configuration of the integrally formed mounting nut 35. A predetermined female screw hole 3a corresponding to the fastening bolt 22 is formed over the entire inner peripheral length, and the piezoelectric element portion 11 is externally inserted so as to be spaced apart from the outer periphery by a predetermined distance. On the other hand, the male nut 3b is formed so that the fastening nut collar 32 is screwed and arranged on the outside while the spacer nut 31c and the fastening nut collar 32 are formed separately on the other outer circumference. Thus, the head 37 with a screw cylinder is configured.

(Fastening nut example 4)
FIG. 10 is a vertical cross-sectional view showing the configuration of the main part of the fastening nut β4 of the fastening nut example 4 which is another embodiment of the fastening nut of the present invention together with its usage.

  As shown in the figure, the fastening nut β4 according to the present fastening nut example 4 replaces the configuration of the mounting screw cylinder portion 34 of the fastening nut β1 according to the fastening nut example 1 with the configuration of the integrally formed mounting nut 35. The female screw holes 3a are formed directly on the inner diameters of the fastening nut flange 32, the spacer nut 31c, and the piezoelectric element holding nut 33, and are screwed into the fastening bolts 23 while sandwiching the piezoelectric elements 31a and 31b. The nut β4 is configured to be sandwiched integrally.

(Fastening nut example 5)
Further, FIG. 11 is a vertical sectional view showing a configuration of a main part of a fastening nut β5 of a fastening nut example 5 which is another embodiment of the fastening nut of the present invention, together with its usage.

  As shown in the figure, a fastening nut β5 according to the present fastening nut example 5 includes a piezoelectric element portion 31 which is the Langevin vibrator of the fastening nut examples 1 to 4 and a pitch direction flexural vibration piezoelectric element 31a and a roll. Instead of the direction flexural vibration piezoelectric element 31b and the spacer nut 31c, a traveling wave elastic bending wave traveling in the circumferential direction around the fastening bolt 22 is applied to the upper end surface 32a of the fastening nut flange 32 in accordance with application of a predetermined alternating voltage. A ring-shaped traveling wave ultrasonic motor vibrator 31d that generates and generates ultrasonic vibrations in a predetermined direction based on the traveling wave elastic bending wave is provided on the lower end surface 32d of the fastening nut flange 32. Composed.

  At this time, for example, a predetermined number of annular grooves centered on the female screw holes 3a are formed on the lower end surface 32d of the fastening nut 12 on the surface in contact with the fastening target member 23, thereby increasing the frictional resistance. 38, the traveling wave elastic bending wave generated in the fastening nut β5 by the friction material 38 can be effectively transmitted to the fastening target member 23 to generate the fastening torque.

  The friction material 38 is provided on the lower end surface 32d of the fastening nuts β1 to β4, for example, from the ultrasonic vibration generated based on the standing wave transmitted on the lower end surface 32d as well as the female screw hole 3a. You may enable it to generate | occur | produce a rotational torque effectively.

(Example of preload transmission device)
FIG. 12 is a vertical cross-sectional view showing a case where the present invention is applied to fastening of the fastening screw α1 of the present invention as an example of its usage together with the configuration of the main part of the preload transmitting device γ which is an embodiment of the present invention. In the example of the transmission device, a case where the fastening screw α1 is applied to the fastening screw will be described. However, the fastening screws α1 to α1 that are provided with piezoelectric elements and can generate a fastening torque by applying a preload to the propulsion direction by the fastening. Applicable to α5 and fastening nuts β1 to β5.

  As shown in the figure, the preload transmission device γ includes a piezoelectric element portion 11, and when the fastening screw α 1 configured to generate a fastening torque based on the ultrasonic vibration of the piezoelectric element 11 is fastened, The arrow in the figure applied to the fastening screw α1 from the outside, applied until the jaw portion 12d of the fastening screw head 12 of α1 is sufficiently in contact with the fastening target member 21 and the fastening force can be used as a preload. It is comprised so that the pre-pressure of the screwing direction shown by may be transmitted.

  Therefore, the preload transmitting device γ collides with a preload receiving portion 41 that receives external force in the screwing direction of the fastening screw α1 from the outside and an upper end surface 13a that is a pressing end surface facing the jaw portion 12d of the fastening screw head 12 of the fastening screw α1. A preload transmission portion 42 that contacts and transmits external force applied to the preload receiving portion 41 to the fastening screw α1, a bearing inner ring 43a that is fixed to the outer peripheral surface of the preload transmission portion 42 and rotates integrally with the preload transmission portion 42, The bearing inner ring 43a is configured to include a bearing 43 that rotates around the rolling element 43b and includes a bearing outer ring 43c that is fixed to the inner peripheral surface of the preload receiving portion 41.

  As a result, the preload transmission device γ has the fastening screw α1 not sufficiently screwed into the fastening target member 21, and the screw thread 2a of the screw portion 2 is screwed into the fastening target member 21, whereby the jaw portion 12d is fastened. For example, when a sufficient fastening force acting to press against the member 21 is not obtained, a sufficient preload in the screwing direction is transmitted to the slack eliminating device 1 and screwed into the fastening target member 21 to the fastening screw α1. It is possible to generate a fastening torque based on ultrasonic vibration, and it is possible to screw into the fastening target member 21 without using a conventional driver or the like.

  Note that the preload transmission device γ includes the fastening screw α5 and the fastening nut β5 that employ the vibrators 11d and 31d of the traveling wave type ultrasonic motor, and the upper end surface 12a of the fastening screw head 12 that does not propagate the traveling wave elastic bending wave or the fastening screw β5. By being configured to come into contact with the upper end surface 32a of the nut flange 32 at the preload transmitting section 42, it is possible to apply preload without hindering ultrasonic vibration.

  As mentioned above, about the embodiment of the present invention, the fastening screw examples 1 to 5, the fastening nut examples 1 to 5 and the preload transmission device example have been described in order, but the present invention is not necessarily limited to the above-described means. However, the present invention can be changed as appropriate within the range having the above-described effects.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the principal part structure of the fastening screw of the fastening screw example 1 which is an embodiment example of this invention fastening screw with the use aspect, The figure (a) is a perspective view which shows the external appearance of the fastening screw example 1. FIG. (B) is a perspective view showing assembly of the fastening screw example 1, and (c) is a vertical sectional view showing a part of the fastened fastening screw example 1 in a partial cross section. It is the figure which abbreviate | omitted and engraved. It is the vertical sectional view which shows the principal part structure of the fastening screw of the fastening screw example 2 which is another example of embodiment of this invention fastening screw with the usage condition. It is the vertical sectional view which shows the principal part structure of the fastening screw of the fastening screw example 3 which is another example of embodiment of this invention fastening screw with the usage condition. It is the vertical sectional view which shows the principal part structure of the fastening screw of the fastening screw example 4 which is another example of embodiment of this invention fastening screw with the usage condition. It is the vertical sectional view which shows the principal part structure of the fastening screw of the fastening screw example 5 which is another example of embodiment of this invention fastening screw with the usage condition. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the principal part structure of the fastening nut of fastening nut example 1 which is an embodiment example of this invention fastening nut with the usage aspect, The figure (a) is a perspective view which shows the external appearance of fastening nut example 1. FIG. FIG. 5B is a perspective view showing the assembly of the fastening nut example 1. It is the vertical sectional view which shows the fastening nut fastened same as the above in a section. It is a vertical sectional view which shows the principal part structure of the fastening nut of the fastening nut example 2 which is another example of embodiment of this invention fastening nut with the usage condition. It is a vertical sectional view which shows the principal part structure of the fastening nut of the fastening nut example 3 which is another example of embodiment of this invention fastening nut with the usage condition. It is a vertical sectional view which shows the principal part structure of the fastening nut of the fastening nut example 4 which is another example of embodiment of this invention fastening nut with the usage condition. It is a vertical sectional view which shows the principal part structure of the fastening nut of the fastening nut example 5 which is another example of embodiment of this invention fastening nut with the usage condition. It is a vertical sectional view showing the case where it is applied to the fastening of the fastening screw example 1 described above as an example of the usage mode together with the configuration of the main part of the preload transmission device which is an embodiment of the present invention preload transmission device.

Explanation of symbols

α1, α2, α3, α4, α5 ... Fastening screw β1, β2, β3, β4, β5 ... Fastening nut γ ... Preload transmission device 1,3 ... Loosening canceller 2 ... Screw part 2a ... Screw thread 3a ... Female screw hole 3b ... Male screw 11, 31 ... Piezoelectric element portion 11a, 31a ... Pitch direction flexural vibration piezoelectric element (piezoelectric element)
11b, 31b ... Roll direction flexural vibration piezoelectric element (piezoelectric element)
11c, 31c ... Spacer nut 11d ... Vibrator of traveling wave type ultrasonic motor 12 ... Fastening screw head 12a, 13a, 32a, 33a ... Upper end surface 12b, 13b, 32b, 33b ... Outer peripheral surface portion 12c, 13c ... Flat surface shape portion 12d ... Jaw part 12e, 13e ... Female stamp 13 ... Piezoelectric element holding nut 14 ... Mounting screw rod 14a ... Upper end 14b ... Lower end 15 ... Fastening screw head with screw rod 16, 36 ... Spacer flange 17 ... Mounting screw rod head 18 , 38 ... friction materials 21, 23, 24 ... fastening target member 22 ... fastening bolt 22 a ... head jaw 22 b ... penetrating protruding end 32 ... fastening nut collar 32 d ... lower end surface 33 ... piezoelectric element holding nut 34 ... mounting screw cylinder Part 35 ... Mounting nut 37 ... Screw cylinder head 41 ... Preload receiving part 42 ... Preload transmission part 43 ... Bearing 43a ... Bearings inner ring 43b ... the rolling element 43c ... bearing outer ring

Claims (12)

The fastening part is a fastening part in which the shaft part is screwed or screwed into the fastening object member until the jaw part sufficiently contacts the fastening object member and a fastening force acts on the head,
The head has a flexural vibration in a pitch direction that excites a flexural vibration in a pitch direction with the y axis as a pitch axis when a rotation axis through which the shaft portion is screwed or penetrated is a z axis in an xyz orthogonal coordinate system. A piezoelectric element portion including a piezoelectric element and a roll direction flexural vibration piezoelectric element that excites a flexural vibration in the roll direction with an x axis orthogonal to the pitch axis as a roll axis;
The fastening part according to claim 1, wherein the shaft part includes a thread groove . The fastening component is a fastening screw having the head as a fastening screw head and the shaft portion as a screw portion,
The piezoelectric element portion is
The pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element extrapolate a mounting screw rod having a lower end screwed at the center of the upper end surface of the fastening screw head, and
The pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element are laminated with a spacer nut threadedly engaged with the mounting screw rod interposed therebetween, and
The pitch direction flexural vibration piezoelectric element, the spacer nut and the roll direction flexural vibration piezoelectric element are sandwiched between a piezoelectric element portion holding nut screwed to the upper end of the mounting screw rod and the upper end surface of the fastening screw head. The fastening part according to claim 1, wherein the fastening part is a part . The mounting screw rod is
Instead the lower end to being NishiUe in the fastening screw head upper surface center,
Fastening component according to claim 2, characterized that you have been integrally fixedly provided similar溶植lower end to the fastening screw head upper surface center. Before SL spacer nut fastening component according to claim 2 or 3 spacer flange portion to an intermediate appropriate position of the mounting threaded rod, characterized in that it is integrally formed. 0054
Before SL in place of the piezoelectric element suppressing the nut,
Said mounting screw rod upper end, for fastening according to the piezoelectric element unit in any mounting threaded rod head according to claim 2 to 4, characterized that you have been integrally formed sandwiching between the fastening screw head upper surface Parts . The fastening screw head and the piezoelectric element part holding nut are:
When the screw itself is screwed into the member to be fastened to the outer peripheral surface portion, or when the piezoelectric element portion holding nut is screwed to the mounting screw rod and the piezoelectric element portion is clamped integrally, external tightening is performed. It has a flat surface-shaped part that forms ridge angles on both sides that become appropriate catches to pressurize the rotational force,
The fastening part according to any one of claims 2 to 5, wherein the fastening part is characterized in that The fastening Nejihe' de及 beauty the piezoelectric element suppressing nut predetermined driver tip across each of the upper end surface center female screw hole is characterized in that it is constituted by Ochii設a female stamping to be fitted fastening component according to any of claims 1 to 6. The fastening part is a fastening part in which the shaft part is screwed or screwed into the fastening object member until the jaw part sufficiently contacts the fastening object member and a fastening force acts on the head,
The head generates a traveling-wave elastic bending wave that travels in a circumferential direction around the z-axis when the rotation axis through which the shaft portion is screwed or penetrated is the z-axis of the xyz orthogonal coordinate system. A vibrator is provided as a piezoelectric element,
The shank fastening components, characterized in that it comprises a screw groove. It said head, the jaws in contact with the concluding target member, fastening components according to any one of claims 1 to 8, characterized in that the friction material is secured. The fastening component is a fastening nut having the jaw portion as a head jaw portion of a fastening bolt, the shaft portion as a fastening bolt shaft, and the head portion as a fastening nut,
A mounting screw cylinder portion having an inner female screw hole to be screwed into the screw thread of the fastening bolt, and a spiral screw thread provided on the outer periphery;
A fastening nut jaw part integrally formed at the lower end of the mounting screw cylinder part and in contact with the fastening object member;
The piezoelectric element portion is
The pitch-direction flexural vibration piezoelectric element and the roll-direction flexural vibration piezoelectric element are extrapolated from the mounting screw cylinder, and
The pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element are laminated with a spacer nut threadedly engaged with the thread of the mounting screw cylinder part interposed therebetween, and
The pitch direction flexural vibration piezoelectric element and the roll direction flexural vibration piezoelectric element are sandwiched between a piezoelectric element portion holding nut and a fastening nut jaw that are screwed into the screw thread at the upper end of the mounting screw cylinder portion. The fastening component according to claim 1, wherein: The mounting screw cylinder part is
The predetermined female screw corresponding to the fastening bolt is formed over the entire inner circumferential length, and the piezoelectric element portion is externally inserted so as to be spaced apart from the outer periphery by a predetermined distance, and the spacer nut and the piezoelectric element portion are disposed outside. One of the holding nuts is molded integrally with one another, and instead of the integrally formed fastening nut flange portion, a fastening nut is screwed and arranged on the outside, and the spacer nut and the piezoelectric element portion are extended over the entire outer circumference. A male screw is formed to screw the fastening nut and one of the holding nuts separately formed,
The fastening component according to claim 10 . In 請 Motomeko 1 to 11 have been comprises a piezoelectric element engagement of the fastening components generated configured to be able to engaging torque based on the ultrasonic vibration of the piezoelectric element according to any one of the jaws is fastened A preload transmission device for transmitting the preload in the screwing direction applied from the outside to the fastening component , applied until the fastening force comes into contact with the target member sufficiently and becomes available as a preload. There,
A preload receiving portion for receiving external force in the screwing direction from the outside;
A preload transmitting portion that butt-contacts the pressing end surface facing the upper end surface of the piezoelectric element portion and transmits the external force applied to the preload receiving portion to the fastening component ;
A bearing inner ring that is fixed to the outer peripheral surface of the preload transmitting portion and rotates integrally with the preload transmitting portion, and a bearing that rotates around the bearing inner ring via a rolling element and is fixed to the inner peripheral surface of the preload receiving portion. A bearing having an outer ring,
A preload transmission device characterized by that.

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