JP7025295B2 - Fixing device - Google Patents

Description

The present invention relates to a fixing device for fixing with bolts and nuts.

A fixing device that fixes a fixing member by screwing a nut into a bolt is widely and generally used. In such a fixing device, a device is made to prevent the nut from loosening (for example, Patent Document 1).

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

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

Japanese Patent No. 4662774 Japanese Patent No. 3955780.

However, in the fixing device described in Patent Document 2, although the axial force can be increased, the force for stopping the loosening does not change, so that the fixing device may loosen.

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

In the fixing device of the present invention, the first member having the shaft portion having the shaft male screw portion formed on the outer peripheral surface is inserted into the opening formed in the second member, and the shaft male screw portion is inserted into the shaft portion. A first fixing device that is fixed to the second member in a state of protruding from the opening, and is screwed into the male screw portion of the shaft to form a first insertion hole and a second insertion hole that penetrate in the axial direction. The nut and the first female screw portion of the shaft male screw portion are screwed to the portion on the proximal end side from the portion where the first nut is screwed, and a first female screw portion and a second female screw portion penetrating in the axial direction are formed. The outer circumference is a second nut engaged with the first nut and a first male screw portion that is inserted through the first insertion hole of the first nut and screwed into the first female screw portion of the second nut. The first bolt having a first shaft portion formed on the surface, a head having a head diameter larger than that of the first shaft portion, and the second insertion hole of the first nut are inserted through the second nut. A second male screw portion screwed to the second female screw portion is provided with a second bolt having a second shaft portion formed on an outer peripheral surface, and the first male screw portion is the first bolt. When the head comes into contact with the first nut in a state where the first insertion hole of one nut is inserted and screwed into the first female screw portion of the second nut, the first shaft The tip of the portion is formed so as not to protrude from the second nut, and the second bolt is in a state where the second male threaded portion is screwed into the second female threaded portion of the second nut. It is formed with a length that abuts on the third member on which the second nut is placed , and the second insertion hole of the first nut and the second female threaded portion of the second nut are the first nut and the second female thread, respectively. A plurality of the first female threaded portions of the first nut and the first female threaded portion of the second nut are formed at a first interval in the circumferential direction of each of the two nuts, respectively. A plurality of nuts are formed at a second interval narrower than the first interval in each circumferential direction of the nut, and the number is larger than each of the second insertion hole of the first nut and the second female thread portion of the second nut. It is characterized by the fact that there are many .

According to the present invention, by bringing the head of the first bolt into contact with the first nut, the female screw portion of the first nut can be pressed against the male screw portion of the shaft in the bolt tightening direction (for example, downward). On the other hand, the female threaded portion of the second nut can be pressed against the male threaded portion of the shaft in the direction opposite to the bolt tightening direction (for example, upward). As described above, according to the present invention, since the force in two directions can be applied to the male screw portion of the shaft, the first nut is compared with the one in which the force is applied to the male screw portion in only one direction. Since the screwing force between the second nut and the first member becomes stronger, the force in the direction of loosening the first nut and the second nut can also be strengthened.

Further, by bringing the tip of the second bolt into contact with the third member on which the second nut is placed, the female threaded portion of the second nut is placed in the opposite direction (for example, upward) of the bolt tightening direction to the male threaded portion of the shaft. Since it can be strongly pressed against, a large axial force can be obtained by the amount of the strong pressing.

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

According to this configuration, by bringing the tip of the second bolt into contact with the washer, a large axial force can be obtained more stably and surely.

Through diligent examination by the applicant, it was found that the force to prevent loosening requires a greater strength than the axial force. According to the above configuration, since the first bolt is provided more than the second bolt, the direction of loosening the first nut and the second nut as compared with the case where the number of the first bolt is less than or equal to the number of the second bolt. Can strengthen the power of.

Further, the distance between the first insertion hole adjacent to the first nut and the second insertion hole is such that a plurality of adjacent first insertion holes arranged between the adjacent second insertion holes of the first nut. It is preferably narrower than the distance between the insertion holes.

According to this configuration, the distance between the adjacent first insertion holes and the second insertion holes of the first nut is such that a plurality of adjacent first insertion holes arranged between the adjacent second insertion holes of the first nut. More first bolts can be placed than those with the same spacing between each other. Further, even if the second bolts are arranged between them, the first bolts can be arranged evenly in the circumferential direction as much as possible. As a result, the force in the direction of preventing the shaft portion from loosening can be increased.

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

According to this configuration, by forming the recess in the center of the tip surface, only the outer peripheral portion of the tip surface of the second bolt comes into contact with the third member, so that the center portion of the tip surface of the second bolt is the third. It is possible to prevent the second bolt for generating the axial force from loosening as compared with the one that comes into contact with the member. Also, since the base end is different between the 1st bolt (with a head larger than the 1st bolt shaft) and the 2nd bolt (without head), it slips under the device and the 1st nut and 2nd nut. Even in places where you have to install, you can touch it with your hands to determine whether it is the 1st bolt or the 2nd bolt, so even in places where it is difficult to work, you can be sure that the 1st nut and the 2nd nut Can be tightened by

It is a perspective view which shows the parts storage extraction apparatus which concerns on one Embodiment of this invention. It is a side view which shows the main body part, a speed reducer, and a gear shaft. It is a perspective view which shows the gear shaft and a fixing device. It is an exploded perspective view which shows the gear shaft and a fixing device. It is an exploded end view which shows the 1st nut, the 2nd nut, a washer, a loosening prevention bolt, and an axial force bolt. It is an end view which shows the 1st nut, the 2nd nut, the washer, the loosening prevention bolt, and the axial force bolt in the state where the loosening prevention bolt is screwed into the 1st nut. It is an exploded end view which shows the gear shaft and a fixing device. It is an end view which shows the gear shaft and a fixing device.

Hereinafter, a component storage / 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, in the component storage / extraction device 1 of the present embodiment, the space between the outer peripheral side and the inner peripheral side of the cylindrical body 2 provided with the hollow portion 2a on the inner peripheral side is divided into multiple stages and images. It is stored in a fixed storage shelf 4 having a built-up component storage section 3, a first component transfer device 5a provided so as to be rotatable along the outer peripheral surface of the storage shelf 4, and a hollow portion 2a of the cylindrical body 2. It is composed of a second component transfer device 5b rotatably provided along the inner peripheral surface of the shelf 4. Further, the storage shelf 4 is provided with a passage 4a that communicates the outer peripheral side and the inner peripheral side with a part of the outer peripheral surface of the cylindrical body 2 along the axial direction.

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

The first component transfer 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 movable in the vertical direction along the columnar member 6a. It includes a vertical moving device 7a and a component gripping device 8a provided in the vertical moving device 7a. Further, the first component transfer device 5a is provided on a table 9 rotatably provided at the lower part of the storage shelf 4 along the outer peripheral surface, and orbits around the storage shelf 4 according to the operation of the table 9. It is said to be free.

On the other hand, the second component transfer device 5b has a columnar member 6b provided along the inner peripheral surface of the storage shelf 4 parallel to the height direction of the storage shelf 4 and a columnar member 6b corresponding to the first component transfer device 5a. It consists of a vertical moving device 7b provided so as to be movable in the vertical direction along the member 6b and a component gripping device 8b provided in the vertical moving device 7b, and the columnar member 6b itself is along the inner peripheral surface of the storage shelf 4. It is provided so that it can rotate by rotating. The vertical moving device 7a and the vertical moving device 7b move along the grooves 10a and 10b. As the component storage / extraction device 1, those described in detail in Japanese Patent Application Laid-Open No. 2002-145410 can be used.

As shown in FIG. 2, the component storage / extraction device 1 includes a rotation mechanism 11 for rotating the second component transfer device 5b. Note that FIG. 1 omits the illustration of the rotation mechanism 11.

The rotation mechanism 11 is connected to a main body portion 12 (second member), a motor 13 provided in the main body portion 12, and a plurality of reduction gears (not shown) that are connected to the motor 13 and reduce the output from the motor 13. The speed reducer 14 is provided with 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 which will be described in detail later.

The main body portion 12 is formed with an opening 12a into which the shaft portion 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, and the upper end portion of the shaft portion 15a has a shaft. A male screw portion 15c is formed.

When the shaft portion 15a is inserted into the opening 12a of the gear shaft 15, the shaft male screw portion 15c protrudes from the opening 12a, and the stepped portion of the lower portion of the shaft portion 15a abuts on 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 reduction gear 14, and a ring gear 5c attached to the upper end portion of the second component transfer device 5b. As a result, 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 transfer 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, 12 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 locking bolt insertion holes 21a to 21l (first insertion hole) and first to third axial force bolt insertion holes 21m to 21o (second insertion hole). , A female screw portion 21p formed on the wall surface constituting the hole is provided.

The first to twelfth locking female screw portions 22a to 22l (first) formed on the wall surface forming the hole in the second nut 22 and screwed with the loosening locking male screw portion 25a of the locking bolt 25. Female threaded portion) and the female threaded portions 22m to 22o (second female) for the first to third axial forces that are formed on the wall surface constituting the hole and screwed with the male threaded portion 26a for the axial force of the axial force bolt 26. A threaded portion) and a female threaded portion 22p formed on the wall surface constituting the hole are provided.

In the present embodiment, the bolt insertion holes 21m to 21o for the first to third axial forces of the first nut 21 and the female screw portions 22m to 22o for the first to third axial forces of the second nut 22 are each the first. A plurality (for example, three) are formed at equal intervals (for example, 120 °) of the first interval (for example, 110 °) or more in the circumferential direction of the nut 21. The above values can be changed as appropriate.

The intervals between the bolt insertion holes 21m to 21o for the first to third axial forces of the first nut 21 and the female screw portions 22m to 22o for the first to third axial forces of the second nut 22 are the first. It does not have to be evenly spaced as long as it is greater than or equal to the interval, and may be, for example, 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 are respectively. A plurality (12 pieces) are formed in the circumferential direction of the first nut 21 at intervals of a second interval narrower than the first interval. The above values can be changed as appropriate.

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 are adjacent to each other. If there are bolt insertion holes 21m to 21o for the 1st to 3rd axial force of the 1st nut 21 or female screw portions 22m to 22o for the 1st to 3rd axial force of the 2nd nut 22, other It is wider than the distance between adjacent objects, but narrower than the first distance.

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

The loosening prevention bolt 25 includes a loosening prevention bolt shaft portion 25b (first shaft portion) in which a loosening prevention male screw portion 25a (first male screw portion) is formed on the outer peripheral surface, and a loosening prevention bolt shaft portion 25b. It has a larger diameter head 25c.

In the loosening prevention bolt 25, the loosening prevention male screw portion 25a is inserted through the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21, and the first to twelfth of the second nut 22 are inserted. When the head 25c comes into contact with the first nut 21 while being screwed into the locking female screw portions 22a to 22l, the length at which the tip of the locking bolt shaft portion 25b does not protrude from the second nut 22. It is formed by bolts.

The axial force bolt 26 includes an axial force bolt shaft portion 26b (second shaft portion) having an axial force male screw portion 26a (second male screw portion) formed on the outer peripheral surface thereof. A recess 26c is formed on the tip surface (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 diameter larger than that of the axial force bolt shaft portion 26b.

The axial force bolt 26 is a washer on which the second nut 22 is placed 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. It is formed with a length that abuts on 24.

[Fixing process]
When the gear shaft 15 is fixed to the main body portion 12 by the fixing device 16, the first nut 21 and the second nut 22 are first set as shown in FIG. At this time, the bolt insertion holes 21m to 21o for the first to third axial forces and the female screws 22m to 22o for the first to third axial forces are set so as to be at the same position.

Further, when setting the first nut 21 and the second nut 22, the first nut 21 and the second nut 22 are set with 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 with the predetermined gap provided. ..

Next, as shown in FIG. 6, after inserting the 12 locking bolts 25 into the first to twelfth locking bolt insertion holes 21a to 21l of the first nut 21 by hand, for example, 12 Each of the loosening prevention male screw portions 25a of the loosening prevention bolt 25 of the book is screwed into the first to 12th loosening prevention female screw portions 22a to 22l of the second nut 22.

Then, as shown in FIG. 7, three axial force bolts 26 are manually inserted into the first to third axial force bolt insertion holes 21m to 21o of the first nut 21, and then the three bolts are inserted. The male threaded portion 26a for each axial force of the bolt 26 for axial force is screwed into the female threaded portions 22m to 22o for the first to third axial forces of the second nut 22. At this time, the three axial force bolts 26 are screwed so as not to protrude from the lower end of the second nut 22.

By such a step, 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 15a of the gear shaft 15 and placed on the receiving portion 12b of the main body portion 12. As a result, 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 22p of the second nut 22 is screwed into the shaft male screw portion 15c of the gear shaft 15. Further, the female threaded portion 21p of the first nut 21 is screwed into the male threaded portion 15c of the shaft. 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 12 locking bolts 25 are applied in a predetermined order with a predetermined torque (for example, a torque of 34% of the final tightening torque). Temporarily tighten, then temporarily tighten the 12 locking bolts 25 in a predetermined order with a predetermined torque (for example, 68% of the torque for final tightening), and finally, 12 loosenings. The fixing bolts 25 are finally tightened in a predetermined order with a predetermined final tightening torque.

The predetermined order is as follows: the locking bolt 25 screwed into the first female screw portion 22a for locking, the locking bolt 25 screwed into the fifth female screw portion 22e for locking, and the ninth. The loosening-preventing bolts 25 screwed into the loosening-preventing female screw portions 22i are represented by the numbers of the first to twelfth loosening-preventing female screw portions 22a to 22l, the second, sixth, and so on. The order is tenth, third, seventh, eleventh, fourth, eighth, and twelfth. The predetermined order can be changed as appropriate.

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 attached. Temporarily tighten with a predetermined torque (for example, 68% of the torque for final tightening) (for example, 20 Nm), and finally, three axial force bolts 26 are sequentially tightened for predetermined final tightening. Fully tighten with torque. The order of temporary tightening and final tightening of the three axial force bolts 26 may be arbitrary.

In the state where the 12 locking bolts 25 are fully tightened, the female threaded portion 21p of the first nut 21 is pressed diagonally downward A1 against the male threaded portion 15c of the gear shaft 15. Further, the female threaded portion 22p of the second nut 22 is pressed against the male threaded portion 15c of the gear shaft 15 in the diagonally upward direction A2. As a result, a stronger pressure can be applied to the shaft male threaded portion 15c as compared with the nut pressed against the male threaded portion in only one direction, and the fixing device 16 (first nut 21 and second nut 22) becomes loose. The preventive power can be increased. Therefore, even when the gear shaft 15 is rotated, the first nut 21 and the second nut 22 do not loosen.

Further, in a state where each of the three axial force bolts 26 is fully tightened, three more axial force bolts 26 are in a state where the lower end surface of the three axial force bolts 26 is in contact with the upper surface of the washer 24. Each of them is rotated in the direction of moving downward. As a result, a force (axial force) that causes the three axial force bolts 26 and the second nut 22 to move upward is generated. Due to the generation of this axial force, the female threaded portion 22p of the second nut 22 is pressed against the male threaded portion 15c of the gear shaft 15. As a result, the total axial force can be increased as compared with the one without the axial force due to the three axial force bolts 26.

Further, since the recess 26c is formed in the central portion of the lower surface of the lower surface of the axial force bolt 26 that abuts on the upper surface of the washer 24, the outer peripheral portion of the lower surface of the axial force bolt 26 abuts on the washer 24. As a result, the axial force bolt 26 is less likely to loosen than the one in which there is no recess and the central portion of the axial force bolt 26 abuts on the washer 24.

In the present embodiment, the bolt insertion holes 21m to 21o for the first to third axial forces of the first nut 21 and the female screw portions 22m to 22o for the first to third axial forces of the second nut 22 are each the first. Three nuts 21 are formed at equal intervals (120 °) at first intervals in the circumferential direction. 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 are respectively. A plurality (12 pieces) are formed in the circumferential direction of the first nut 21 at intervals equal to or less than the second interval narrower than the first interval.

With such a configuration, the axial force is generated by the three axial force bolts 26 and those screwed thereto, and the force in the direction of locking the loosening is screwed to the 12 locking bolts 25 and the bolts 25 thereof. Since it is generated by what is used, the axial force and the force in the direction of preventing loosening can be increased as compared with the case where the force in the direction of preventing loosening is generated by the same number of bolts and those screwed thereto.

Further, in the present embodiment, the distance between the adjacent first locking bolt insertion hole 21a of the first nut 21 and the first axial force bolt insertion hole 21m is for the adjacent first axial force of the first nut 21. It is narrower than the distance between adjacent bolt insertion holes 21a to 21d for first to fourth locking bolts arranged between the bolt insertion holes 21m and the second axial force bolt insertion holes 21n.

With this configuration, the distance between the adjacent first locking bolt insertion holes 21a of the first nut 21 and the first axial force bolt insertion hole 21m is set so that the distance between the adjacent first axial force bolt insertion holes 21m of the first nut 21 is the adjacent first axial force bolt insertion holes. Looseness compared to the ones with the same distance between adjacent ones of the first to fourth locking bolt insertion holes 21a to 21d arranged between 21m and the second axial force bolt insertion holes 21n. Many fixing bolts 25 can be arranged. As a result, the force in the direction of preventing loosening can be increased.

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

First, when the metal ring W whose size data such as the peripheral length value is measured after being manufactured in the previous step 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, in the control device (not shown), the rotation angle of the table 9 and the vertical movement device 7a are obtained from the position information of the component storage unit 3 for accommodating the metal ring W and the current position of the first component transfer device 5a. Calculate the distance traveled. Then, the control device drives the table 9 and the vertical moving device 7a to move the component gripping device 8a to a position facing the component storage unit 3 for accommodating the metal ring W.

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

The control device mutually exchanges information such as size data related to the metal ring W stored in the parts storage unit 3 by the first parts transfer device 5a and position information of the parts storage unit 3 in which the metal ring W is stored. Correspond and memorize.

Next, when the metal ring W stored in the parts storage unit 3 is extracted, this is done by the second parts 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 having 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 on the inner peripheral side of the storage shelf 4 and the position information of the component storage unit 3 in which the metal ring W is stored, which is stored in association with the information such as the size data. From the current position of the second component transfer device 5b, the rotation angle of the columnar member 6b (second component transfer device 5b) and the vertical movement distance between the vertical movement device 7b are calculated. Then, the control device drives the rotation mechanism 11 and the vertical movement device 7b to move the component gripping device 8b to a position facing the component storage unit 3 for accommodating the metal ring W.

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

When the metal ring W is extracted 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 accommodating portion 3.

Next, the metal ring W is extracted from the component storage unit 3. The control device drives the rotation mechanism 11 in a state where the component gripping device 8b of the second component transfer device 5b grips the metal ring W extracted as described above, and the component gripping device 8b faces the passage 4a. The metal ring W is transported 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 cope with the above. A plurality of fixing devices 16 may be provided vertically. For example, the fixing device 16 arranged downward may be arranged in a downward state in which the bolts 25 and 26 face downward, in which case the locking bolt 25 and the axial force bolt 26 become invisible. Since the screw tightening order of the loosening prevention bolt 25 and the axial force bolt 26 is determined, it is necessary to distinguish between the loosening prevention bolt 25 and the axial force bolt 26.

In the fixing device 16 according to the present invention, the loosening prevention bolts 25 and the axial force bolts 26 have different shapes. Therefore, even if they are not visible, they can be loosened by, for example, touching the downward fixing device 16 by hand. It is possible to distinguish between the fixing bolt 25 and the axial force bolt 26. Therefore, it can be easily fixed by the fixing device 16.

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 comes into contact with the receiving portion 12b of the main body portion 12.

In the above embodiment, the present invention is implemented in the fixing device 16 for fixing the gear shaft 15, but the present invention can be implemented in the fixing device for fixing various members (first member), and the various members rotate. It is effective when it is applied to things that are to be used or to things that are subject to vibration to various members.

12 ... Main body part (second member) 12a ... Opening, 15 ... Gear shaft (first member), 15a ... Shaft part (shaft insertion part), 15c ... Shaft male screw part, 16 ... Fixing device, 21 ... First nut , 21a to 21l ... 1st to 12th locking bolt insertion holes (1st insertion hole), 21m to 21o ... 1st to 3rd axial force bolt insertion holes (2nd insertion hole), 22 ... 2nd nut , 22a to 22l ... 1st to 12th female screw parts for preventing loosening (1st female screw part), 22m to 22o ... 1st to 3rd axial force female screw parts (2nd female screw part), 24 ... Seat metal , 25 ... Loosening prevention bolt (1st bolt), 25a ... Loosening prevention male screw part (1st male screw part), 25b ... Loosening prevention bolt Shaft part (1st shaft part), 26 ... Axial force bolt (2nd bolt), 26a ... Male threaded portion for axial force (2nd male threaded portion), 26b ... Bolt shaft portion for axial force (2nd shaft portion)

Claims (4)

In a state where the 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 and the shaft male screw portion is projected from the opening. A fixing device for fixing to the second member.
A first nut screwed into the male screw portion of the shaft and formed with a first insertion hole and a second insertion hole penetrating in the axial direction.
The first female threaded portion and the second female threaded portion penetrating in the axial direction are formed by being screwed into the proximal end side portion of the shaft male threaded portion from the portion where the first nut is screwed, and the first female threaded portion is formed. The second nut engaged with the nut and
A first shaft portion having a first male screw portion formed on an outer peripheral surface through which the first insertion hole of the first nut is inserted and screwed into the first female screw portion of the second nut, and the first shaft portion. The first bolt, which has a head with a diameter larger than that of the shaft,
A second bolt having a second shaft portion having a second male threaded portion formed on the outer peripheral surface of the second female threaded portion of the first nut, which is inserted through the second insertion hole of the first nut and screwed into the second female threaded portion of the second nut. When,
Equipped with
The head of the first bolt is 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 it comes into contact with 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 with a length that abuts on a third member on which the second nut is placed, with the second male threaded portion screwed into the second female threaded portion of the second nut. ,
A plurality of the second insertion hole of the first nut and the second female thread portion of the second nut are formed at a first interval in the circumferential direction of each of the first nut and the second nut.
Each of the first insertion hole of the first nut and the first female thread portion of the second nut is a second narrower than the first spacing in the circumferential direction of each of the first nut and the second nut. A fixing device formed in a plurality of intervals and having a larger number than each of the second insertion hole of the first nut and the second female screw portion of the second nut . In the fixing device according to claim 1,
The third member is a fixing device comprising a ring-shaped washer on which the shaft portion is inserted and abutted against the second member to be positioned and on which the second nut is placed. In the fixing device according to claim 1 or 2.
The distance between the first insertion hole adjacent to the first nut and the second insertion hole is such that 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 the distance between them. In the fixing device according to any one of claims 1 to 3, the fixing device
The second bolt is a fixing device characterized in that the base end portion on the head side is formed with a diameter equal to or less than the diameter of the second shaft portion, and a concave portion is formed on the tip surface.

Images