JP2019074190A - Anti-loosening structure, anti-loosening jig, and method for manufacturing anti-loosening structure - Google Patents

Abstract

To exert an inexpensive and high anti-loosening function in a fastener by providing a bolt and a nut.SOLUTION: An anti-loosening structure 100 for preventing loosening in a fastened state in a fastener 7 including a bolt 1 having a through hole extending in a radial direction and a nut 2 to be engaged with the bolt 1 includes an anti-loosening member 3 having two projection parts 31, 32 inserted through the through hole 12 of the bolt 1 to project from each opening of the through hole 12. In the anti-loosening member 3, the two projection parts 31, 32 are wound around the peripheral surface of the nut 2, or the two projection parts 31, 32 are wound around the peripheral surface of a tip of the bolt 1 extending from the nut 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a locking structure for a fastener, a locking jig, and a method of manufacturing the locking structure.

  Conventionally, in order to prevent loosening of the fastening state between a nut having a radially extending groove formed on one side and a bolt having a through hole, the split pin of the nut is aligned with the through hole of the bolt. There is a structure which inserts and prevents loosening of a fastening state (for example, refer to patent documents 1.).

  The nut described in Patent Document 1 is formed with a plurality of grooves extending in the radial direction, and a bolt to which the nut is fastened is formed with a through hole through which a split pin is inserted. The locking structure for holding the bolt and nut in a fixed state is by aligning the groove of the nut with the through hole of the bolt, inserting the split pin into the groove and through hole, and bending the tip of the split pin It is formed.

  Such a locking structure with bolt and nut in a closed state is used at a site where detachment of the nut from the bolt is not permitted.

JP-A-8-312628

By the way, when a split pin is used like the locking structure of patent document 1, since the front-end | tip part of the split pin which advanced from the through-hole is bent up and down, wobbling had generate | occur | produced in the split pin itself. In addition, the split pin inserted into the through hole in the locking structure is generally expensive, and the tip of the bolt that protrudes from the through hole is divided in half, so there is room for improvement in the locking strength. .
Moreover, when bending a split pin manually using a pliers etc. like before, the rigidity of a split pin was high and big force was needed for bending operation. Moreover, since the tip of the split pin is bent in different directions, it takes much work time for one split pin. In the case of manufacturing a plurality of loosening structures using split pins, the physical burden on the worker also increases with the passage of work time, leading to a delay in the operation, and the quality of the completed loosening structures may vary. there were.

  Therefore, the present invention has been made in view of the above problems, and can provide a low cost, high slack prevention function, and can easily be manufactured. It is an object of the present invention to provide a locking jig for manufacturing a lock and a method of manufacturing a locking structure.

  In order to achieve the above object, the present invention provides a locking structure for preventing looseness of a fastening state in a fastener comprising a bolt having a radially extending through hole and a nut engaged with the bolt. And having two protrusions which are inserted into the through holes of the bolt and project from respective openings of the through holes, and the two protrusions are wound around the circumferential surface of the nut, or The invention is characterized in that the two protrusions include a locking member wound around the circumferential surface of the tip of the bolt extending from the nut.

  Preferably, in the locking member, the two protrusions are wound in the same direction.

  Further, it is preferable that the winding direction of the two protrusions is the same as the loosening direction of the nut.

  The nut has at least a pair of grooves extending in the radial direction from the axial center at mutually opposing positions sandwiching the axial center of the nut, and the two projecting portions are wound around the circumferential surface of the nut In the state, it is preferable that the groove is inserted.

  Preferably, the two protrusions are in contact with an end face of the nut on which the bolt extends in a state of being wound around the bolt.

  In order to achieve the above object, the present invention is further a locking jig for manufacturing the locking structure, which comprises: a main body attached to the fastener; and concentrically with respect to the main body. And a plurality of rotating members rotatably supported in a pair at mutually opposing positions sandwiching an axial center of the main body, wherein the two projecting portions of the paired rotating members are the penetrations of the bolt. When the main body is rotated in a state in which it protrudes from the hole and protrudes in the gap between the adjacent rotation members in the circumferential direction, the two protrusions are brought into contact with each of the two protrusions. It is characterized in that it is provided on the main body at a position where it is wound around a circumferential surface of a nut or wound around a circumferential surface of a tip portion of a bolt extended from the nut.

  Further, it is preferable that an engaging portion, with which a tool for rotating the main body is engaged, be provided on the other surface of the main body opposite to the surface on which the rotating member is supported.

  In addition, the main body closes at least one gap formed between the rotating members in the circumferential direction, and has a stopper with which one end of the two projecting portions of the locking member before being wound abuts. Is preferred.

  In order to achieve the above object, the present invention is further a manufacturing method of manufacturing the above-mentioned locking structure, wherein the nuts are arranged radially opposite each other across the axial center of the nut. The nut is adjusted and engaged with the bolt such that the pair of grooves of the nut and the through hole of the bolt communicate with each other; A plurality of rotating members coaxially supported by the main body and rotatably supported in pairs at mutually opposing positions sandwiching the axial center of the main body; and the two protrusions pass through the bolt through the bolt When the main body is rotated in a state in which it protrudes from the hole and protrudes in the gap between the adjacent rotary members in the circumferential direction, the two protrusions are brought into contact with each of the two protrusions and the nut Roll around the circumference of A locking jig provided on the main body at the rotating position is mounted on the fastener, and the linear locking member is formed by the gap between the rotating members, the pair of grooves and the groove. The locking member is inserted into the through hole, and the locking jig is rotated in a predetermined direction to bring the rotating member into contact with the two projecting portions, thereby winding the two projecting portions around the nut.

  In order to achieve the above object, the present invention is further directed to a manufacturing method for manufacturing the above-mentioned locking structure, which comprises: a main body; A plurality of rotating members rotatably supported in a pair at a position, wherein the two protrusions project from the through holes of the bolt and in a gap between the rotating members adjacent in the circumferential direction When the main body is rotated in the protruded state, the pair is brought into contact with each of the two protrusions to wrap the two protrusions around the tip of the bolt extending from the nut. A rotating jig installed on the main body mounts a locking jig on the main body, and the linear locking member is inserted through the gap of the rotating member and the through hole, Rotate the tool in the specified direction Serial to the rotary member is contacted to each of the two projections, characterized in that wrapping the two protrusions on the bolt.

  According to the present invention, a low cost and high anti-loosening function can be exhibited.

It is a figure for demonstrating the structure of the spacer for electric wires. It is a perspective view which shows the locking structure of a fastener. It is a top view which shows the locking structure of a fastener. It is a perspective view of a locking jig. It is a top view of a locking jig. It is a rear view which shows a locking jig in part see-through | perspectively. It is a side view of a locking jig. It is a side view which shows the state before mounting a securing jig in a fastener. It is the partial perspective view which saw the state in which the locking jig was mounted | worn with the fastener from the side. It is a plane sectional view showing the state where the locking jig was attached to the fastener. It is a plane sectional view showing the state after rotation of the locking jig attached to the fastener. It is a perspective view which shows the locking structure of the fastener which concerns on a modification.

  Preferred embodiments of the present invention will be described with reference to the drawings. The embodiment shown below is one example and can take various forms within the scope of the present invention.

  FIG. 1 is a figure for demonstrating the structure of the spacer for electric wires. FIG. 2 is a perspective view of the locking structure of the fastener. FIG. 3 is a plan view of the locking structure of the fastener.

  The locking structure 100 according to the present embodiment is applied to, for example, a wire spacer 200 as shown in FIG. For convenience of description, the configuration of the spacer 200 will be described first.

  First, in the present embodiment, a spacer 200 for four conductors will be described as an example. As shown in FIG. 1, a spacer 200 for four conductors welds a connecting rod 220 in a cylindrical chamber 210 to form a frame for four conductors. The four chambers 210 are arranged at an angular interval of about 90 ° from the center of the spacer 200, and each of the four chambers 210 has a grip 230 attached thereto.

  The clamps 231 and 232 of the grip portion 230 are openable and closable, and clamp the electric wire C between the clamps 231 and 232. In the grip portion 230, the shaft bolt 233 and a tightening spring 234 that loads the shaft bolt 233 toward the clamp 231 press the clamp 232 against the clamp 231.

  The chambers 210 are connected by a plurality of connecting rods 220 to form a substantially square frame 240. A grip 230 is attached to each chamber 210 via a terminal 250.

  When the gripping portion 230 is connected to the terminal 250 and assembled to the chamber 210, a rotation preventing member (not shown) for holding the regular mounting posture of the gripping portion 230 is provided at a predetermined position of the chamber 210. There is.

  A coil spring (not shown) is provided in the chamber 210. The coil spring is supported in the chamber 210 in a state of being wound around the bolt 1 of the terminal 250 and compressed by a nut 2 via a washer (see FIG. 2) 236.

  The nut 2 is screwed to the bolt 1, and the pin 3 maintains the fastening state with the bolt 1. The locking structure 100 according to the present embodiment is formed of, for example, a bolt 1, a nut 2 and a pin 3. The configuration of the locking structure 100 will be described below.

<Restraint structure>
As shown in FIG. 2, the locking structure 100 includes a bolt 1, a nut 2, and a pin (locking member) 3 engaged with the bolt 1 and the nut 2. In addition, the thing by which the nut 2 was fastened (screwed) to the volt | bolt 1 may be called "the fastener 7" for convenience of explanation.

  The bolt 1 has a cylindrical shaft portion, and an external thread portion 11 for screwing with the nut 2 is formed on the outer peripheral surface of the shaft portion. As shown in FIG. 3, the shaft portion of the bolt 1 has a through hole 12 having a predetermined diameter penetrating in the diameter direction. The inner diameter of the through hole 12 is larger than the diameter of the pin 3, and the pin 3 is inserted into the through hole 12.

  The nut 2 has a main body portion 21 having a hexagonal column shape, and a plurality of wall portions 22 erected on the side of one end face 21 a of the main body portion 21 at equal intervals in the circumferential direction. A through hole (not shown) through which the bolt 1 is inserted in the axial direction is formed at the center of the main body portion 21. On the inner peripheral surface of the through hole of the main body portion 21, a female screw portion (not shown) to be screwed with the male screw portion 11 of the bolt 1 is formed.

  A predetermined space is formed between the outer peripheral surface of the wall 22 and the outer peripheral edge of the main body 21 on the end face 21 a side of the main body 21 of the nut 2. The space is provided so that the pin 3 wound around the outer peripheral surface of the wall portion 22 is substantially accommodated.

  The plurality of walls 22 are provided along the periphery of the through hole of the main body 21, that is, concentric with the axis of the nut 2, and a plurality of grooves 23 are formed between the respective walls 22. There is. The grooves 23 are defined in the circumferential direction of the nut 2 by a plurality of wall portions 22 and are provided in pairs at mutually opposing positions sandwiching the axial center of the nut 2. The groove 23 extends radially from the axial center of the nut 2, that is, radially from the axial center of the nut 2.

  Internal threads of the plurality of wall portions 22 facing (opposed to) the outer circumferential surface of the bolt 1, that is, the inner circumferential surfaces of the plurality of wall portions 22 are female threads screwed with the male screw portion 11 of the bolt 1 The portion 24 is formed. The number of grooves 23 is six in the present embodiment, but the number of grooves 23 is determined by the number of wall portions 22 and is not particularly limited to the number of the present embodiment.

  The width in the circumferential direction of the groove 23 of the nut 2 is larger than the diameter of the pin 3, and the pin 3 is inserted into the groove 23. Further, the width (inner diameter) of the through hole 12 of the bolt 1 is formed larger than the width in the circumferential direction of the groove 23 of the nut 2.

  When the locking of the fastener 7 is held by the pin 3, the through hole 12 formed in the bolt 1 is partially covered by the wall 22. A well-known grooved nut can be used for the nut 2.

  The pin 3 is a straight steel bar (straight pin) before being bent, which is smaller than the inner diameter of the through hole 12 and has a diameter of, for example, φ 3.0 to 3.5 mm, particularly φ 3.1 mm. Is preferred. As shown in FIG. 3, the pin 3 is inserted into the through hole 12 of the bolt 1 and a pair of mutually opposed grooves 23 of the nut 2. The pin 3 has two projections 31 and 32 which are inserted into the through holes 12 of the bolt 1 and project from the openings of the through holes 12. The protruding portions 31 and 32 of the pin 3 are portions exposed radially outward from the through holes 12 of the bolt 1 and also protrude radially outward from the grooves 23 of the nut 2. Note that the shape of the pin 3 before bending is “linear” also includes a substantially linear shape as long as it can be inserted into the through hole 12 of the bolt 1 and the pair of grooves 23 of the nut 2 facing each other.

  The pin 3 is sandwiched between the peripheral edge 12 a of the through hole 12 facing in the bending direction of the projecting portions 31 and 32 and the side end surface 22 a of the wall 22 facing the bending direction. The protruding portions 31 and 32 of the pin 3 are wound around the circumferential surface of the nut 2 in the counterclockwise direction (loose direction) in the drawing, and more specifically, wound around the outer circumferential surface of the wall portion 22. The protruding portions 31 and 32 of the pin 3 are wound around the outer peripheral surface of the wall portion 22 of the nut 2 at a portion protruding from the groove 23, and the pin 3 as a whole is formed in a substantially Z shape (inverted S shape).

  The protrusions 31 and 32 of the pin 3 are in contact with the end face 21 a of the main body 21 of the nut 2 on the side where the tip of the bolt 1 extends in a state of being wound around the outer peripheral surface of the wall 22 of the nut 2 ing.

  The winding directions of the protrusions 31 and 32 of the pin 3 are the same as each other, and in the present embodiment, are counterclockwise. The winding direction of the pin 3 is the same as the loosening direction (counterclockwise direction) of the nut 2. The protrusions 31 and 32 of the pin 3 are bent in a counterclockwise direction to be in contact with the outer peripheral surface of the wall 22 of the nut 2, but may be in a position very close to the outer peripheral surface of the wall 22.

<Relaxation jig>
Next, the configuration of the locking jig 300 for manufacturing the locking structure 100 will be described using FIGS. 4 to 7. FIG. 4 is a perspective view of the locking jig. FIG. 5 is a plan view of the locking jig. FIG. 6 is a rear view showing the locking jig in a partially transparent manner. FIG. 7 is a side view of the locking jig.

  As shown in FIG. 4, the locking jig 300 includes a main body 4, a plurality of rotating members 5, and a guide member 6. The main body 4 includes, for example, a steel disc member 41 and a hexagonal prism-shaped engaging member 42 integrally provided on the disc member 41. At the center of the disc member 41, a through hole 41a (see FIG. 6) penetrating in the thickness direction of the disc member 41 is provided.

  The engagement member 42 is a portion engaged with a tool for rotating the main body 4 and hence the locking jig 300, and is provided on one end surface 41b side of the disk member 41 as shown in FIG. . The engaging member 42 is fixed integrally with the disc member 41 concentrically with the through hole 41 a of the disc member 41 by, for example, friction welding or the like, and does not rotate relative to the disc member 41. It is supposed to be.

  As shown in FIG. 6, on the other end surface 41c side opposite to the one end surface 41b of the disc member 41, a circular step 43 formed one step lower toward the one end surface 41b is formed. . The step 43 has a diameter slightly larger than the diameter of a circle formed by tracing the outer peripheral surface of each wall 22 of the nut 2 and is formed concentric with the through hole 41a.

  The bottom surface 44 of the stepped portion 43 is formed to be in contact with the upper end surface 22 b of each wall portion 22 of the nut 2 when the locking jig 300 is attached to the fastener 7. The stepped portion 43 is formed to have a predetermined depth that partially accommodates the wall portions 22 of the nut 2 in the axial direction.

  The rotating member 5 is rotatably attached to the other end surface 41 c side of the disk member 41 of the main body 4. The rotating member 5 is a known bearing, and includes an outer ring 51, an inner ring 52, and rolling elements 53 disposed between the outer ring 51 and the inner ring 52. A cylindrical support member 54 is integrally fixed to the inner ring 52. The support member 54 is integrally attached to the disc member 41 and the guide member 6.

  Six rotating members 5 are provided on the disk member 41 at equal intervals in the circumferential direction thereof. Specifically, the rotating members 5 are concentric with the disk member 41 and the axial center of the disk member 41 Are supported by the disc member 41 in a state of forming a pair at mutually opposing positions.

  In the state where the two protrusions 31 and 32 of the linear pin 3 protrude from the through hole 12 of the bolt 1 and into the gap 55 between the adjacent rotary members 5 in the circumferential direction, the main body 4 is loosened and fixed The rotating member 5 is attached to the disc member 41 at a position where the two protrusions 31 and 32 can be wound around the circumferential surface of the wall 22 of the nut 2 when rotated by the tool 300. At least a diameter of the diameter of the pin 3 is provided between the plurality of rotating members 5 and the outer peripheral surface of the wall portion 22 of the nut 2.

  The distance d between the opposing rotating members 5 shown in FIG. 6 is substantially equal to, slightly smaller or slightly smaller than the diameter (outer diameter) of the imaginary circle vc with which the main body 21 of the nut 2 as shown in FIG. Is getting bigger. If the distance d between the opposing rotating members 5 is slightly smaller than the diameter of the imaginary circle vc, it can be wound around the outer peripheral surface of the wall 22 of the nut 2 while crushing the protrusions 31 and 32 of the pin 3. .

  As shown in FIG. 7, a gap 55 is formed in the circumferential direction between the plurality of rotating members 5. The gaps 55 between the plurality of rotating members 5 are formed in pairs on the diameter of the disc member 41. One of the opposing gaps 55 is closed by the stopper 45. When the stopper 45 inserts the pin 3 into the gap 55, the groove 23 of the nut 2 of the fastener 7 and the through hole 12 of the bolt 1 when the locking structure 100 is manufactured, the pin 3 is inserted. It is a member which the tip of the side contacts and prevents omission of pin 3.

  The guide member 6 is formed of, for example, a steel disc. The guide member 6 is provided opposite to the other end surface 41 c of the disc member 41, and the plurality of rotation members 5 are rotatably attached via the support member 54. The guide member 6 sandwiches the plurality of rotating members 5 together with the disc member 41.

  The guide member 6 has a through hole 61 penetrating in the thickness direction of the guide member 6 at the center thereof. The through hole 61 has an inner diameter larger than the through hole 41 a of the disc member 41. The guide member 6 is concentric with the disc member 41 and has an outer diameter smaller than the outer diameter of the disc member 41.

  The through hole 61 of the guide member 6 is formed concentrically with the through hole 41 a of the disc member 41, and the inner diameter of the through hole 61 is slightly larger than the imaginary circle vc of the main body 21 of the nut 2. It has become. The guide member 6 guides the locking jig 300 to the fastener 7 such that the main body 21 of the nut 2 is accommodated in the through hole 61 when the locking jig 300 is attached to the fastener 7.

<Method of Manufacturing Locking Structure>
Next, the manufacturing method of the locking structure 100 is demonstrated using FIG. 8 thru | or FIG. FIG. 8 is a side view showing a state before the locking jig is attached to the fastener. FIG. 9 is a partial perspective view of the locking jig attached to the fastener viewed from the side. FIG. 10 is a plan sectional view showing a state in which the locking jig is attached to the fastener. FIG. 11 is a plan sectional view showing the state of the locking jig attached to the fastener after rotation.

  When the locking structure 100 is formed on the four-conductor spacer 200, the four-conductor spacer 200 is placed horizontally.

  First, as shown in FIG. 8, the locking jig 300 is attached to the fastener 7. When mounting, the position of the nut 2 with respect to the bolt 1 is adjusted so that the through hole 12 formed in the bolt 1 and the pair of grooves 23 of the nut 2 communicate with each other. Here, in the “communication”, the through hole 12 of the bolt 1 is not completely blocked by the wall portion 22 of the nut 2, and the straight pin of the through hole 12 of the bolt 1 and the groove 23 of the nut 2 is 3 means that the insertion is not prevented.

  Next, the locking jig 300 is attached to the fastener 7 by bringing the locking jig 300 closer to the fastener 7 from the guide member 6 side. Specifically, in the order of the through hole 61 of the guide member 6 and the through hole 41 a of the disc member 41, the tip of the shaft portion of the bolt 1 passes, and finally, the bolt 1 passes through the through hole 41 a of the disc member 41. It is out of the In this state, the upper end surface 22b of the wall 22 of the nut 2 is in contact with the bottom surface 44 of the step 43 of the main body 4, and the main body 21 of the nut 2 is positioned inside the through hole 61 of the guide member 6. .

  Further, in a state where the locking jig 300 is attached to the fastener 7, the gap 55 between the rotating members 5 in the locking jig 300 communicates with the through hole 12 of the bolt 1 and the groove 23 of the nut 2. Make it One of the gaps 55 of the pair of gaps 55 communicating with the through hole 12 of the bolt 1 and the groove 23 of the nut 2 is closed by the stopper 45 (see FIG. 10). The locking jig 300 is mounted such that the stopper 45 is positioned below the fastener 7 in the vertical direction.

  Then, as shown in FIG. 9 and FIG. 10, the linear pin 3 from the side of the gap 55 not closed by the stopper 45 from its one end side, the groove 23 of the nut 2, the through hole 12 of the bolt 1, the nut 2 It is inserted until it abuts against the stopper 45 through the groove 23 (dropping).

  Then, for example, a predetermined tool (a wrench, an electric impact wrench, a motor, etc.) is engaged with the engagement member 42 of the main body 4 of the locking jig 300 to rotate the locking jig 300 in the counterclockwise direction (nut 2 Rotate in the direction of). As a result, the protrusions 31 and 32 of the pin 3 are wound around the outer peripheral surface of the wall 22 of the nut 2 in the counterclockwise direction. Even if the nut 2 is pivoted in the loosening direction, the wall portion 22 of the nut 2 is in contact with the pin 3 and a further force acts on the pin 3 in the bending direction, so a stronger locking effect is obtained. Play.

  The rotating member 5 rotates (rotations) while being in contact with the pin 3 as the locking jig 300 rotates. Specifically, the rotary member 5 abuts on the protrusions 31 and 32 of the pin 3 protruding outward in the radial direction from the groove 23 of the nut 2, and the protrusions 31 and 32 form the outer periphery of the wall 22 of the nut 2. It is bent in the rotation direction of the locking jig 300 along the surface.

  With the rotation of the locking jig 300, for example, the inner peripheral edge of the through hole 61 of the guide member 6 and a part of the outer peripheral edge of the main body 21 of the nut 2 come into contact to loosen the nut 2 (counterclockwise Direction) and rotates slightly to the extent that there is no problem in the fastening condition between the nut 2 and the bolt 1. Thereby, as shown in FIG. 11, the position of the groove 23 of the nut 2 with respect to the through hole 12 of the bolt 1 is shifted, and the through hole 12 is partially covered by the wall 22 of the nut 2. It will be in the state pinched | interposed between the periphery 12a of the hole 12, and the side end surface 22a of the wall part 22 of the nut 2. As shown in FIG.

  The rotation angle of the locking jig 300 is not particularly limited. For example, when the locking jig 300 is rotated by a tool such as a wrench, when the protrusions 31, 32 of the pin 3 are wound around the wall 22 of the nut 2, the sense of resistance in the rotational direction decreases and the locking structure It can sense that the body 100 has been formed.

  Finally, when the locking jig 300 is removed from the locking structure 100, the protruding portions 31 and 32 of the straight pin 3 are bent to form the locking structure 100 having a substantially S-shape as a whole. It is formed.

  According to the locking structure 100 manufactured as described above, the linear pin 3 is used, and the manufacturing cost can be reduced because the manufacturing can be performed in a smaller number of processes compared to the case where a conventional split pin is used. can do. Further, since the two protrusions 31 and 32 of the pin 3 are wound around the wall 22 of the nut 2 in the same direction (counterclockwise direction in the above embodiment), the wobble of the pin 3 is suppressed. To improve the locking effect.

  Also, since straight pins are generally less expensive than split pins, component costs can be reduced.

  Since the bending direction of the pin 3 is the same as the loosening direction of the nut 2, simultaneously with the bending of the pin 3 by the locking jig 300, the nut 2 pivots slightly in the loosening direction (counterclockwise direction). As the nut 2 rotates, the wall 22 of the nut 2 pushes the protrusions 31 and 32 in the counterclockwise direction, and the protrusions 31 and 32 are, as shown in FIG. It will be in the state pinched | interposed between 12a and the side end surface 22a of the wall part 22 of the nut 2, and the pin 3 will be firmly tightened to the volt | bolt 1. As shown in FIG.

  The bending direction of the protrusions 31 and 32 may be the tightening direction of the nut 2. In this case, since the bending direction of the protrusions 31 and 32 is opposite to the loosening direction of the nut 2, the nut 2 is loosened. When it is turned, the protrusions 31, 32 may rise in the direction opposite to the bending direction. Therefore, it is preferable that the bending direction of the protrusions 31 and 32 be a loosening direction opposite to the tightening direction of the nut 2. Even if the nut 2 tries to rotate in the loosening direction, the nut 2 comes in contact with the protrusions 31 and 32 in the bending direction of the pin 3 and the force for loosening the winding of the pin 3 does not work. Can be effectively prevented.

  The locking structure 100 can be easily manufactured using the locking jig 300. The plurality of rotation members 5 are rotatably supported by the main body 4 at positions where the plurality of rotation members 5 can contact the two protrusions 31 and 32 and wind the protrusions 31 and 32 around the circumferential surface of the nut 2. Thereby, a predetermined tool is engaged with the engaging member of the main body 4 in a state where the pin 3 is inserted into the gap 55 between the rotating members 5 adjacent in the circumferential direction, the groove 23 of the nut 2 and the through hole 12 of the bolt 1 The locking structure 100 can be easily manufactured simply by engaging with 42 and rotating (pivoting) the main body 4 by a predetermined rotation angle.

  The locking structure 100 is usually manufactured in a place where the looseness of the fastening state of the bolt 1 and the nut 2 in the fastener 7 is not allowed, and the diameter of the pin 3 is extremely difficult to be bent by hand. Such large diameter ones are used.

  As in the prior art, when bending the split pin manually using a plier or the like, the split pin has high rigidity, and a large force is required for the bending operation. Moreover, since the tip of the split pin is bent in different directions, it takes much work time for one split pin. In the case of manufacturing a plurality of loosening structures using split pins, the physical burden on the worker also increases with the passage of work time, leading to a delay in the operation, and the quality of the completed loosening structures may vary. there were.

  On the other hand, in the locking jig 300, it is possible for the worker to easily manufacture the locking structure 100 without bending the split pin manually using a tool as in the prior art. In addition, since the operation depending on the skill level of the worker is omitted, it is possible to manufacture a stable quality loose structure 100.

  In other words, according to the locking jig 300, the manufacturing procedure of the locking structure 100 is as follows: the locking jig 300 is attached to the fastener 7, and the clearance 55 facing the linear pins 3 between the rotating members 5; It is only necessary to insert the groove 23 of the nut 2 and the through hole 12 of the bolt 1 and rotate the locking jig 300. With the rotation of the main body 4 of the locking jig 300, the protruding portions 31, 32 of the pin 3 are bent downstream (counterclockwise direction) by the rotating member 5 on the upstream side in the rotational direction. It is easily wound around the outer peripheral surface of the portion 22.

  The locking structure 100 can be manufactured simply and quickly simply by engaging a predetermined tool with the engagement member 42 and pivoting the locking jig 300, and a tool for rotating the locking jig 300. The work speed can be increased by using a motorized impact, and the work can be automated by using a motor or the like.

<Modification>
Next, a locking structure 400 according to a modification will be described with reference to FIG. FIG. 12 is a perspective view of a locking structure according to a modification. In addition, about the same structure as the locking structure 100, the same code | symbol is attached | subjected and description is abbreviate | omitted. Also, the locking structure 400 can be manufactured by substantially the same procedure as the method of manufacturing the locking structure 100.

  As shown in FIG. 12, the locking structure 400 includes a bolt 1, a nut 8, and a pin (locking member) 3 engaged with the bolt 1 and the nut 8. In addition, the thing by which the nut 8 was fastened by the volt | bolt 1 may be called "the fastener 9" for convenience of explanation.

  Unlike the nut 2 in the locking structure 100, the nut 8 is not formed as a grooved nut, and has only the main body portion 81. The pin 3 is inserted into the through hole 12 of the bolt 1, and the protrusions 31, 32 protruding from both openings of the through hole 12 are bent and wound around the outer peripheral surface of the bolt 1 in the same direction (the loosening direction of the nut 2). It is done.

  In a state where the protrusions 31 and 32 of the pin 3 are wound around the bolt 1, the protrusions 31 and 32 are in contact with the end surface 81a of the nut 2 facing the side where the bolt 1 extends.

  In the locking jig 300 for manufacturing the locking structure 400, the supporting position of the opposing rotating member 5 in the disc member 41 has a diameter larger than that of the locking jig 300 used when manufacturing the locking structure 100. Inward in the direction. This is because the nut 8 of the locking structure 400 is not provided with the wall portion 22 like the nut 2, and the pin 3 is directly wound around the outer periphery of the bolt 1.

  The plurality of rotary members 5 are in contact with the two protrusions 31 and 32, and are disc members at positions where the protrusions 31 and 32 can be wound around the circumferential surface of the tip of the bolt 1 extended from the nut 8. It is provided at 41. Thereby, the main body 4 is formed by a predetermined tool in a state in which the two protrusions 31 and 32 of the pin 3 protrude from the through hole 12 of the bolt 1 and into the gap 55 between the rotary members 5 adjacent in the circumferential direction. Is rotated by a predetermined rotation angle, the rotating member 5 comes in contact with the two protrusions 31, 32, the two protrusions 31, 32 are wound around the outer peripheral surface of the bolt 1, and the The locking structure 100 can be manufactured.

  The locking structure 400 has the same locking action and effect as the locking structure 100, and the general nut 8 can be used, so the structure is simplified. In the locking structure 400, the nut 8 abuts on the protrusions 31 and 32 of the pin 3 even when the nut 8 is pivoted in the loosening direction and axially moved on the bolt 1. Axial movement can be reliably stopped.

  In addition, when the protruding portions 31 and 32 of the pin 3 are in contact with the end face of the nut 8 on the side where the bolt 1 extends, between the pin 3 and the nut 8 so that the nut 8 does not rotate in the loosening direction. The friction force is formed on the

<Others>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, in the above embodiment, the locking structure 100, 400 is applied to the wire spacer, but it is desirable that the locking structure 100, 400 prevent the bolt 1 and the nuts 2, 8 from being loosened. The application range is not particularly limited as long as the location is determined.

  Further, the rotating member 5 is not limited to a bearing, and may be, for example, a rotating cylindrical member such as a roller. The installation number of the rotation members 5 is not limited to six as described in the above embodiment, and may be two, four or eight.

  Further, the engaging member 42 of the main body 4 of the locking jig 300 is provided with a through hole concentric with the through hole 41 a of the disc member 41 and having a female screw formed on the inner peripheral surface. It is also good. For example, when a shaft portion of a motor or the like having a corresponding male screw portion formed therein is inserted into the through hole of the engagement member 42, the locking jig 300 can be easily rotated.

  Also, the winding direction of the pin 3 may be the same as the tightening direction (clockwise) of the nut 2.

1 bolt 11 male screw 12 through hole 2 nut 22 wall 23 groove 3 pin (locking member)
31, 32 Protrusion 4 Main body 41 Disc member 42 Engaging member (engaging portion)
Reference Signs List 5 rotating member 55 gap 6 guide member 100, 400 locking structure 200 spacer 300 locking jig

Claims (10)

A locking structure for preventing loosening of a fastening state in a fastener comprising: a bolt having a radially extending through hole; and a nut engaged with the bolt;
It has two protrusions which are inserted into the through holes of the bolt and project from respective openings of the through holes,
The two projections may be wound around the circumferential surface of the nut, or the two projections may be provided with a locking member wound around the circumferential surface of the tip of a bolt extended from the nut. And a locking structure.   The locking structure according to claim 1, wherein the locking member has the two protrusions wound in the same direction.   The locking structure according to claim 1, wherein a winding direction of the two protrusions is the same as a loosening direction of the nut. The nut has at least a pair of grooves extending radially from the axial center at mutually opposing positions sandwiching the axial center of the nut,
The locking structure according to any one of claims 1 to 3, wherein the two projecting portions are inserted into the groove in a state of being wound around a circumferential surface of the nut.   The said two protrusion parts are in contact with the end surface by which the said bolt of the said nut is extended in the state wound by the said volt | bolt, The any one of Claim 1 to 4 characterized by the above-mentioned. The locking structure as described in. A locking jig for manufacturing the locking structure according to any one of claims 1 to 5, comprising:
Body and
A plurality of rotary members rotatably supported in pairs concentrically with each other and at mutually opposing positions sandwiching the axis of the main body;
Equipped with
The main body is rotated in a state in which the two projecting portions project from the through-hole of the bolt and project into the gap between the circumferentially adjacent rotating members. In this case, the main body is provided on the main body at a position where it is in contact with each of the two protrusions to wind the two protrusions around the circumference of the nut or around the circumference of the tip of a bolt extended from the nut A locking jig for producing a locking structure characterized by   The locking according to claim 6, wherein an engaging portion engaged with a tool for rotating the main body is provided on the other surface of the main body opposite to the one surface on which the rotating member is supported. Loosening jig for manufacturing structures.   The main body is characterized by closing at least one gap formed between the rotating members in the circumferential direction and having a stopper with which one end of the two projecting portions of the locking member before being wound abuts. The locking jig according to claim 6 or 7, wherein A manufacturing method of manufacturing the locking structure according to any one of claims 1 to 5,
The nut has at least a pair of grooves extending radially from the axial center at mutually opposing positions sandwiching the axial center of the nut,
The nut is adjusted and engaged with the bolt such that the pair of grooves of the nut and the through hole of the bolt communicate with each other.
The main body and a plurality of rotary members supported rotatably in pairs at mutually opposing positions concentrically with respect to the main body and sandwiching the axial center of the main body, the two protrusions being the above When the main body is rotated in a state where the bolt protrudes from the through hole and protrudes in the gap between the circumferentially adjacent rotary members, the two protrusions come into contact with each other. Mounting a loosening jig provided on the main body at the position where the rotating member is provided on the main body at a position where the part is wound around the circumferential surface of the nut;
Inserting the linear locking member into the gap between the rotating members, the pair of grooves and the through hole;
A method of manufacturing a locking structure characterized in that the locking jig is rotated in a predetermined direction to bring the rotating member into contact with the two protrusions, and the two protrusions are wound around the nut. . A manufacturing method of manufacturing the locking structure according to any one of claims 1 to 5,
The main body and a plurality of rotary members supported rotatably in pairs at mutually opposing positions concentrically with respect to the main body and sandwiching the axial center of the main body, the two protrusions being the above When the main body is rotated in a state where the bolt protrudes from the through hole and protrudes in the gap between the circumferentially adjacent rotary members, the two protrusions come into contact with each other. Mounting a loosening jig provided on the main body at the position where the rotating member is provided on the main body at the position where the part is wound around the circumferential surface of the tip of the bolt extended from the nut;
The linear locking member is inserted through the gap of the rotating member and the through hole,
A method of manufacturing a locking structure characterized in that the locking jig is rotated in a predetermined direction to bring the rotating member into contact with the two protrusions, and the two protrusions are wound around the bolt. .

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