TWI555919B - Nut structure - Google Patents

Description

Nut structure

The present invention relates to an internal thread configuration in which two internal threads can be coupled to each other.

The so-called anti-lock release type of thread has been proposed in a wide variety of types. However, these do not completely prevent the lock from being loosened, but only the speed at which the lock release is released is delayed, in other words, it is classified as a thread that is difficult to loosen. In view of this problem, Japanese Patent Document 1 discloses that the mechanical structure is modified to prevent the lock from being loosened, and the threaded configuration in which the lock is released can be completely prevented.

In particular, the so-called ratchet type internal thread structure among the screw structures described in Patent Document 1 allows a pair of two internal threads to be coupled to each other at a desired position on the external thread to achieve a fully coupled state.

Patent Literature: PCT/JP2009/053092

The internal thread according to the 23rd, 24th, and the like of the Japanese Patent Document 1 is a ratchet structure portion formed by the end faces of the two internal threads facing each other, respectively, which are convex or concavely formed substantially perpendicularly to the end surface. a configuration in which the position of one of the ratchet roots is inserted into the top of the other ratchet tooth in relation to the amount of fastening of the internal thread, and the position of the top of the ratchet is maximally deviated from the ratchet without proper tightening. The possibility of a pitch amount.

The positional deviation of the axial direction due to the deviation of the rotational position of the one tooth distance, assuming a thread pitch of 1.0 mm and a ratchet pitch of 10°, the maximum is about 0.028 mm, depending on the accuracy or use of the thread. Within the range, or absorbed by the elastic deformation amount in the axial direction caused by the bonding force, the positional deviation or the axial force is not actually changed. However, if the thread pitch or the ratchet pitch becomes large, the positional deviation amount in the axial direction is also Will become larger and proportional to the larger. For example, the thread pitch is set at 3mm and the ratchet When the pitch is set at 120°, the positional deviation in the axial direction is at most 1 mm.

However, in order to prevent the position from deviating from the position, the ratchet pitch can be tightened by only one more pitch from the fully engaged position, but the distance of the other tooth by the fully engaged position is tight. Solid work will be difficult.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems and to provide a state in which a pair of internal threads are easily joined to each other with an appropriate tightening torque, and an internally threaded configuration in a fully coupled state can be easily obtained.

The internal thread structure of the present invention is characterized in that it has a pair of first internal threads and a second internal thread, and one end of the first internal thread has a convex portion that is reduced in diameter from the base end to the tip end, and one end of the second internal thread has In the concave portion in which the diameter is increased from the bottom portion to the opening portion, one or more engagement portions are provided on at least one of the convex portion and the concave portion, and one or more engagement portions are engaged on the other circumferential surface. In the engaging portion, the engaging portion is formed in a zigzag shape, and the zigzag shape of the engaging portion is a direction in which the concave portion is unidirectionally rotated to prevent reverse rotation when the concave portion is fitted into the engaging portion, and the card is inserted. The joint portion is formed in a zigzag shape, and the zigzag shape of the engaged portion is set such that the convex portion is unidirectionally rotated to prevent reverse rotation when the convex portion is fitted into the engaged portion.

The convex portion and the concave portion are configured such that one of the convex portion and the concave portion is elastically or plastically deformed to be fitted to each other.

The profile shape of the longitudinal section of the convex portion and the contour shape of the longitudinal profile of the concave portion corresponding thereto are different from each other.

The outline shape of the longitudinal section of the convex portion is set to be the same as the contour shape of the longitudinal section of the concave portion corresponding to the inner shape of the concave portion.

The inclination angle of the outer circumferential surface of the convex portion from the base end to the tip end diameter is different from the inclination angle of the inner circumferential surface of the concave portion which is reduced in diameter from the opening surface to the bottom surface.

The inclination angle of the outer circumferential surface of the convex portion which is reduced in diameter from the base end to the distal end faces the axial direction, and the inclination angle of the inner circumferential surface of the concave portion which is reduced in diameter from the opening surface to the bottom surface is set to face the axial direction.

The outer diameter of the base end portion of the convex portion is set to be larger than the inner diameter of the opening portion of the concave portion.

The engaging portion is formed in a zigzag shape.

The engaged portion is formed in a zigzag shape.

The number of the engagement portions is the same as the number of the engagement portions.

The number of the engagement portions is different from the number of the engagement portions.

The spiral groove of the first internal thread and the spiral groove of the second internal thread are different from each other.

The pitch of the spiral groove of the first internal thread and the pitch of the spiral groove of the second internal thread are different from each other.

Among the helical grooves of the first female screw and the helical grooves of the second female screw, one of them becomes a spiral groove that rotates to the right, and the other becomes a spiral groove that rotates to the left.

The first female screw and the second female screw are set to have different outer diameters.

According to the internal thread structure of the present invention, the convex portion provided at one end of the first female screw and having the engaging portion at the outer peripheral surface thereof from the proximal end to the distal end is fitted to the end provided at the second internal thread And a recessed portion having an engaged portion on the inner peripheral surface thereof from the opening surface to the bottom surface, wherein the two first internal threads and the second female screw are interlocked with each other on the external thread, and the two first internal threads are When the second female threads are close to each other and the convex portion is further penetrated into the concave portion, the first female screw and the second female screw are relatively rotated while being gradually rotated, and the engaging portion is easily formed. When it is engaged with the engaged portion, the relative reverse rotation between the first internal thread and the second thread can be completely prevented in this engaged state. Further, the relative rotation of the first internal thread and the second internal thread by the engagement position of the engaging portion and the engaged portion causes a more combined state, and the engagement position of one segment becomes significantly easier.

Further, the spiral groove of the first internal thread and the spiral groove of the second internal thread are different from each other, in particular, the pitch of the spiral groove of the first internal thread and the spiral groove of the second internal thread The pitch is set to be different from each other, and the relative rotation direction in which the first female screw and the second female screw are close to each other is allowed to rotate, and the reverse rotation is prevented from rotating. The engagement portion is set to correspond to the engaged portion. In the case of a zigzag ratchet configuration, the phase between the first internal thread and the second internal thread can be completely prevented. The reverse rotation, so the desired position on the external thread can easily completely prevent the lock from loosening. Further, one of the spiral groove of the first female screw and the spiral groove of the second female screw is set to a right-hand thread, and the other is set to a left-hand thread and the first internal thread and the second internal thread are close to each other. The rotation direction is allowed to rotate, and the reverse rotation is prevented from being rotated. The zigzag ratchet structure corresponding to both the engagement portion and the engaged portion is set, and the first thread and the second thread can be completely prevented. The relative reverse rotation between the two, so that the desired position on the external thread can easily completely prevent the lock from loosening.

Further, the convex portion is reduced in diameter toward the tip end, and the concave portion is expanded in diameter toward the opening portion, thereby improving the holding or releasing of the upper mold by forging and improving the productivity.

Form for implementing the invention

Hereinafter, embodiments of the internal thread structure of the present invention will be described in detail. The internal thread structure of the present invention includes a pair of first internal threads and a second internal thread. Of course, the internal thread mentioned here is not only a so-called nut but also a coupling member which is coupled with an externally threaded body such as a bolt, and the like, and the other includes a spiral groove which is opened by the combined body itself. Holes and so on.

The first female screw has a convex portion whose diameter is reduced from the proximal end to the distal end on one end side in the axial direction. The second female screw has a concave portion that is recessed from the end surface and whose diameter is reduced from the opening surface to the bottom surface on one end side in the axial direction. The convex portion and the concave portion are fitted to each other to couple the first internal thread and the second internal thread to each other.

One of the convex portion and the concave portion can be configured to be elastically or plastically deformed when the convex portion is fitted into the concave portion, and in particular, when it is configured to be elastically deformed and fitted, it is easy to obtain a complete anti-locking release. status. The configuration in which the fitting is performed in accordance with the deformation is set such that the contour shape of the outer shape of the longitudinal section of the convex portion and the contour shape of the inner shape of the longitudinal section of the concave portion are different from each other. More specifically, for example, even if the inclination angle of the outer circumferential surface of the convex portion which is reduced in diameter from the base end to the distal end is different from the inclination angle of the inner circumferential surface of the concave portion which is reduced in diameter from the opening surface to the bottom surface, the inclination angle is different from each other. The mode setting can still be achieved. In this situation In the case where the inclination angle of the axial direction with respect to the outer circumference of the convex portion which is reduced in diameter from the proximal end to the distal end is reduced, the inclination angle of the inner circumferential surface of the concave portion which is reduced in diameter from the opening surface to the bottom surface is reduced. When the embedding of the convex portion to the concave portion is gradually performed, the fastening of the concave portion to the convex portion is naturally increased and the elastic deformation is gradually accompanied. Further, by setting the outer diameter of the base end portion of the convex portion to be larger than the inner diameter of the opening portion of the concave portion, it is possible to more reliably accompany the elastic deformation.

An appropriate number of engaging portions are provided at appropriate positions on the outer peripheral surface of the convex portion. The engaging portion is engaged with the engaged portion provided on the inner circumferential surface of the recess to mechanically prevent relative rotation between the first female screw and the second female screw. The shape of the engaging portion is not particularly limited, but may be formed, for example, in a zigzag shape. In this case, it is preferable to set such that the first female screw and the second female screw are allowed to rotate in the opposite direction, but the number of the engaged portions is equal to the number of the engaged portions. By constructing a necessary larger torque by forward rotation or reverse rotation and making it stronger, or setting the set number to be different from each other, it is possible to set the torque necessary for the positive or negative rotation of the engagement pitch to be more finely adjusted. Set to be smaller.

An appropriate number of engaged portions are provided at appropriate positions on the outer peripheral surface of the recess. The engaged portion is engaged with the engaging portion provided on the outer peripheral surface of the convex portion to mechanically prevent relative rotation between the first female screw and the second female screw. The shape of the engaging portion is not particularly limited, but may be formed, for example, in a zigzag shape. In this case, it is preferable to set such that the first female screw and the second female screw are allowed to rotate in the opposite direction, but the number of the engaged portions is equal to the number of the engaged portions. By constructing a necessary larger torque by forward rotation or reverse rotation and making it stronger, or setting the set number to be different from each other, it is possible to set the torque necessary for the positive or negative rotation of the engagement pitch to be more finely adjusted. Set to be smaller.

The spiral groove of the first internal thread may be set to an appropriate size or configuration, but in order to obtain an anti-release effect as a spiral combination, it is preferable to spiral the first internal thread and the second internal thread. The grooves are set to be different from each other, and for example, the pitch of the spiral groove of the first internal thread and the pitch of the spiral groove of the second internal thread may be different from each other, or the spiral groove of the first internal thread may be 2nd internal thread One of the spiral grooves is configured such that one of the spiral grooves is a right-rotating spiral groove and the other is a left-turning spiral groove. Of course, one of the spiral groove of the first internal thread and the spiral groove of the second internal thread may be set as a right-hand thread and the other as a left-hand thread, and the pitch of the two right-hand threads and the pitch of the left-hand thread may be different from each other. Way to set. As described above, the spiral groove of the first internal thread and the spiral groove of the second internal thread are different from each other in such a manner that the thread pitch is different or the thread direction is different, and the direction of the loosening direction can be completely prevented. Rotate. That is, even if the relative rotation of the first internal thread and the second internal thread in the direction away from each other by the fitting relationship between the convex portion and the concave portion is prevented, only the two internal threads that are integrally joined may be formed at this point. The situation of being able to rotate integrally with each other in the direction of loosening, but still can be said to completely eliminate this state of affairs. However, when the first thread and the second thread in the thread direction of the same direction are set to be different in thread pitch, it is desirable to position the threaded body having a fine pitch at the distal end side of the male screw.

Further, the first female screw and the second female screw may be configured in a nut shape, and the outer diameters may be set to be different from each other. Of course, the outer diameters of the two internal threads can also be set to be equal, but by the different settings, the bonding work can be made easier when combined using a bonding tool or the like.

Example 1

The internal thread configuration 1 of the embodiment formed by applying the present invention will be described in detail with reference to the accompanying drawings. As shown in Fig. 1, the female screw structure 1 of the present embodiment includes two internal threads of the pair of the first female screw 2 and the second female screw 3, and can be borrowed on the male screw B with a small torque. The first internal thread 2 and the second internal thread are more firmly coupled by the mechanical structure to prevent the two internal threads from rotating relative to each other in a rotational direction. In addition, the desired locking position on the external thread B is in a state in which the mechanical structure is prevented from rotating in the loosening direction to completely prevent the lock from being released.

As shown in Fig. 1, the first female screw 2 and the second female screw 3 of the present embodiment are each formed in a so-called hexagonal nut shape having a substantially hexagonal cylindrical outer shape portion 2a, 3a, and a first female screw. The maximum outer diameter of the outer shape portion 2a of the second inner diameter 3 is set to be equal to or smaller than the minimum outer diameter of the outer shape portion 3a of the second female screw 3. In addition, outside the first internal thread 2 The axial length of the shape portion 2a is set to be shorter than the axial length of the outer shape portion 3a of the second female screw 3. Needless to say, such an outer diameter or an axial direction length is set to be arbitrary. For example, the size of the outer diameter does not necessarily have to be smaller than the outer diameter of the first female screw 2, and the outer diameter of the second female screw 3 may be external. The diameter of the second internal thread 3 may be set to be shorter when the diameter is set smaller.

As shown in FIG. 2, the first female screw 2 has a convex portion 2b that is convexly formed at one end portion of the outer shape portion 2a in the axial direction formed in a substantially regular hexagonal shape. The convex portion 2b is reduced in diameter from the proximal end 2c to the distal end, and is formed to be rotationally symmetrical about the axis of the first internal thread 2, and the inside thereof penetrates the threaded portion of the hole 2e with the spiral groove inside the outer shape portion 2a. 2f is constructed by continuously extending the setting. Needless to say, it is not necessary to form the threaded portion 2f inside the convex portion 2b, and the external thread B may have a through hole in such a manner that it can be inserted, but it is preferably a thread provided inside the outer shape portion 2a from the viewpoint of improving strength. The portion 2f sets the thread portion in a sequence. Further, in the present embodiment, the screw portion 2f of the first female screw 2 is set to be a left-handed spiral groove, that is, a left-hand thread.

The outer peripheral surface of the convex portion 2b is set to be inclined at an appropriate angle to the axial direction by an inclination angle α, and is reduced in diameter from the proximal end 2c to the distal end 2d. In the outer peripheral surface of the convex portion 2b, the engaging portion 2g formed in a zigzag shape at 18 points is set at an equal pitch, and the number of the engaging portions 2g is set to at least one, and is not particularly limited, for example, As shown in Fig. 3, one total of three engaging portions 2g may be set in each of the 120° rotationally symmetrical portions. Of course, it does not have to be rotationally symmetrical. The zigzag shape of the engaging portion 2g sets the direction of the tooth so as to allow rotation in the direction in which the concave portion 3b is rotated to the left to prevent reverse rotation. The tooth surface width is set such that the base end side 2c side is wider and narrows toward the tip end 2d. Needless to say, the shape of the engaging portion 2g is not particularly limited, and for example, it may be formed in a spiral shape by a plurality of threads. In particular, in the case of the spiral engagement portion 2g, when the spiral rotation direction is set to a direction opposite to the rotation direction of the screw portion 2f, the coupling between the internal threads can be further improved.

As shown in Fig. 4, the second female screw 3 has a concave portion 3b which is recessed at one end portion in the axial direction of the shape portion 3a which is formed in a substantially regular hexagonal shape. The recessed portion 3b is expanded in diameter from the bottom surface 3d to the opening portion 3d, and is rotated about the axis of the second internal thread 3 The inside is formed symmetrically, and the inside thereof is configured to communicate with a hole 3e having a spiral groove that penetrates the inside of the outer shape portion 3a and is inserted through the external thread B. Further, the screw portion 3f of the second female screw 3 in the present embodiment is a right-threaded spiral groove which is set to rotate rightward. Here, the root diameter or the tip diameter or the nominal diameter of the screw portions 2f and 3f of the two first female threads 2 and the second female screw 3 may be different from each other, but in the present embodiment, the same diameter is set.

The inner peripheral surface of the recessed portion 3b is set to have an inclination angle β which is inclined at an appropriate angle to the axial direction, and is expanded from the bottom surface 3c to the open end 3d. However, in the present embodiment, in particular, the inclination angle β is set to be smaller than the inclination angle α. In the circumferential surface of the concave portion 3b, the zigzag-shaped engaging portion 2g formed at the outer peripheral surface of the convex portion 2b at 18 equal pitches is formed into a zigzag-shaped engaged portion 3g. Here, the number of the engaged portions 3g to be set is at least one, and is not particularly limited, and is not necessarily rotationally symmetrical. When the zigzag shape of the engaged portion 3g is fitted by the convex portion 2b, the direction of the tooth is set such that the direction of rotation to the left is allowed to rotate in the relative rotation with the first female screw 2, but the reverse rotation is prevented. The tooth surface width is set such that the bottom surface 3c side is narrow and the opening end 3d is widened. Of course, the shape of the engaged portion 3g is not particularly limited, and for example, it may be formed in a spiral shape by a plurality of threads. In particular, in the case where the spirally engaged portion 3g is provided, when the spiral rotation direction is set to a direction opposite to the rotation direction of the screw portion 3f, the coupling between the internal threads can be further improved.

With respect to the internal thread configuration 1 in the present embodiment constituted as described above, the inclination angle β of the concave portion 3b is small due to the inclination angle α with respect to the convex portion 2b, as shown in Fig. 5, as long as the concave portion 3b The tip end abuts against the tooth waist in the axial direction of the convex portion 2b without elastic or plastic deformation, and the convex portion 2b is configured such that the concave portion 3b cannot be completely fitted, so that the convex portion 2b is slightly deformed and pressed while being joined. Inside the recess 3b.

Therefore, when the convex portion 2b or the concave portion 3b is elastically deformed and fitted, and the engaging portion 2g is engaged with the engaging receiving portion 3g, the first female screw 2 and the second female screw 3 can be firmly combined. The force completely prevents the relative right rotation of the two.

Here, the two first internal threads 2 and the second thread 3 are respectively engaged with the external thread Thread B and the external thread B, but the external thread shown in FIG. B is a spiral groove having a right rotation and a spiral groove rotating leftward in the same region on the screw portion b.

1‧‧‧ internal thread construction

2‧‧‧1st internal thread

2a‧‧‧Shape

2b‧‧‧ convex

2c‧‧‧ base

2d‧‧‧Top

2e‧‧‧hole with spiral groove

2f‧‧‧Threading Department

2g‧‧‧Clock Department

3‧‧‧2nd thread

3a‧‧‧Shape

3b‧‧‧ recess

3c‧‧‧ bottom

3d‧‧‧Open end

3e‧‧‧hole with spiral groove

3f‧‧‧Threading Department

3g‧‧‧Becamped

B‧‧‧ external thread

B‧‧‧Threading Department

Fig. 1(A) is a side view showing a state in which the first female screw and the second female screw are coupled in one embodiment of the present invention. Figure 1(B) is a bottom view.

Fig. 2(A) is a plan view showing the first internal thread shown in Fig. 1. Fig. 2(B) is a partial cross-sectional view seen from the side.

Fig. 3 is a plan view showing a modification of the first female screw shown in Fig. 2;

Fig. 4(A) is a longitudinal sectional view showing the second internal thread shown in Fig. 1. Figure 4(B) is a bottom view.

Fig. 5 is a schematic cross-sectional view showing a state in which the convex portion of the first female screw shown in Fig. 1 is fitted to the concave portion of the second female screw.

Fig. 6 is a view showing a state in which the female screw structure of the present embodiment is coupled to the male screw, and the first female screw and the second female screw are coupled to the male screw.

1. . . Internal thread construction

2. . . First internal thread

2b. . . Convex

2f. . . Thread part

3. . . 2nd internal thread

3b. . . Concave

3f. . . Thread part

Claims (13)

An internal thread structure having a pair of first internal threads and a second internal thread, wherein one end of the first internal thread has a convex portion that is reduced in diameter from a base end to a tip end, and one end of the second internal thread has One or more engagement portions are provided on the circumferential surface of at least one of the convex portion and the concave portion, and one or more engagement portions are provided on the other circumferential surface of the concave portion that is expanded from the bottom portion to the opening portion, and the engagement portion is provided on the other circumferential surface. In the engaged portion, the engaging portion is formed in a zigzag shape, and the zigzag shape of the engaging portion is configured such that the concave portion is unidirectionally rotated to prevent reverse rotation when the concave portion is fitted into the engaging portion. The engaged portion is formed in a zigzag shape, and the direction of the zigzag shape of the engaged portion is set such that the convex portion is unidirectionally rotated to prevent reverse rotation when the convex portion is fitted into the engaged portion. The internal thread structure according to the first aspect of the invention, wherein the convex portion and the concave portion are configured such that at least one of the convex portion and the concave portion is elastically or plastically deformed to be fitted to each other. The internal thread structure according to the first aspect of the invention, wherein the contour shape of the longitudinal section of the convex portion and the contour shape of the longitudinal section of the concave portion corresponding thereto are different from each other. The internal thread structure according to the first aspect of the invention, wherein the contour shape of the longitudinal cross section of the convex portion is the same as the contour shape of the longitudinal cross section of the concave portion corresponding thereto. The internal thread structure according to any one of claims 1 to 4, wherein the inclination angle of the convex portion from the base end to the tip end to the axial direction and the concave portion from the opening surface to the bottom surface are reduced in diameter The inclination angles of the inner circumferences facing the axial direction are different from each other. The internal thread structure according to any one of claims 5, wherein the inclination angle of the axial direction with respect to the outer circumference of the convex portion from the base end to the distal end is reduced from the opening surface to the bottom surface. The inner circumference of the recessed portion of the reduced diameter faces the inclination angle in the axial direction. The internal thread structure according to any one of claims 1 to 4, wherein an outer diameter of a proximal end portion of the convex portion is set to be larger than an inner diameter of an opening portion of the concave portion. The internal thread structure according to any one of claims 1 to 4, wherein the number of the engagement portions is equal to the number of the engagement portions. The internal thread structure according to any one of claims 1 to 4, wherein the number of the engagement portions is different from the number of the engagement portions. The internal thread structure according to any one of claims 1 to 4, wherein the spiral groove of the first internal thread and the spiral groove of the second internal thread are different from each other. The internal thread structure according to any one of claims 10, wherein a pitch of the spiral groove of the first internal thread and a pitch of the spiral groove of the second internal thread are different from each other. The internal thread structure according to any one of claims 1 to 4, wherein one of the spiral groove of the first internal thread and the spiral groove of the second internal thread becomes a right-rotating spiral The groove, the other side becomes a spiral groove that rotates to the left. The internal thread structure according to any one of claims 1 to 4, wherein the first internal thread and the second internal thread are set to have different outer diameters.