JP2016109274A - Female screw body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mass-produce a single female screw body having two kinds of female screw structures different in lead angles and/or lead directions with high quality.SOLUTION: A female screw body 100 includes a female screw spiral structure 114 formed on an inner peripheral face of a hole portion 106a of a cylindrical member 106, a contact face 110a formed on an axial end face of the cylindrical member 106, and a reverse rotation prevention member 160 disposed and fixed to the contact face 110a, having a projecting portion 168 projecting radially inward to a rotating shaft, and configuring a continuous or discontinuous spiral engagement edge 168a of a lead angle and/or a lead direction different from the lead angle and/or lead direction of the female screw spiral structure 114, at a projecting end of the projecting portion 168. The engagement edge 168a can be elastically deformed radially outward in being engaged with a male screw, to permit relative rotation in one direction of the male screw 10 and the female screw spiral structure 114, and to lock the relative rotation in the other direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a female screw body that is screwed with a male screw body.

  As one of the fastening structures, there is one using a so-called male screw body such as a bolt and a so-called female screw body such as a nut. With respect to the fastening structure using this screw body, two types of spiral grooves (for example, a right male screw portion and a left male screw portion) having different lead angles and / or lead directions are formed on one male screw body, and the two types of spirals are formed. Some double threaded bodies (for example, a right female threaded body and a left female threaded body) are separately screwed into the groove, like a double nut. If the relative rotation of the two types of female screw bodies is suppressed by some engagement means, mechanical interference with the male screw is caused by the axial interference action or the axial separation action caused by different lead angles and / or lead directions. A locking effect can be provided (see Patent Document 1).

  Further, as an application, two types of female screw strips having different lead angles and / or lead directions are formed on a single female screw body (claims 15 to 19 of patent document 1, (See FIGS. 41 to 43). In this case, in order to allow relative rotation of the female screw body and the male screw body limited to the fastening direction, one female screw strip is formed of a plate-like member so as to be elastically deformable.

Japanese Patent No. 5406168

  With the widespread use of a single female screw body having two types of female screw threads with different lead angles and / or lead directions, further mass production will be required in the future. In order to meet many demands, it is required to always form two types of female screw strips with high accuracy on the female screw body while realizing low-cost and mass production.

  The present invention has been made by the inventor's diligent research in view of the above-mentioned problems, and a single female screw body having two types of female screw structures with different lead angles and / or lead directions is obtained with high quality. The purpose is to enable mass production.

  The present invention that achieves the above-mentioned object is set to an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole of the cylindrical member and formed on the inner peripheral surface of the hole of the cylindrical member. A female screw spiral structure, a receiving portion having an abutting surface formed on an end surface of the cylindrical member in the axial direction of the hole, and an inward radial direction toward the axis. An intermittent or continuous helical engagement set at a lead angle and / or lead direction different from the lead angle and / or lead direction by the projecting end of the protrusion. An anti-rotation member that constitutes a joint edge, and the engagement edge can be elastically deformed so as to rotate with respect to a direction in which the protruding end side deviates from the contact surface with a base end side as a fulcrum, When the male screw is screwed, it is screwed while repeating the elastic deformation, and the female screw screw is Characterized by locking the acceptable and relative rotation in the other direction relative rotation in one direction of the structure, a female screw member.

  The internal thread spiral structure of the cylindrical member of the internal thread body includes a first spiral groove set in an appropriate lead angle and / or lead direction, and a lead angle and / or lead different from the first spiral groove. The second spiral groove set in the direction can be threadedly engaged with one spiral groove of the male screw having a multiple screw structure formed by overlapping the same region. Further, when this cylindrical member is screwed along one spiral groove of the male screw, the engaging edge of the female screw body becomes the other spiral of the first spiral groove and the second spiral groove of the male screw. It can be elastically deformed so as to rotate with respect to the direction in which the protruding end side deviates from the contact surface with the proximal end side of the engagement edge as a fulcrum, while contacting with the thread of the groove, and repeating the elastic deformation A female screw body characterized by allowing the relative rotation in one direction of the female screw spiral structure and locking the relative rotation in the other direction by overcoming the thread of the other spiral groove [s1]. .

  Further, when the contact surface is viewed by a cross section in a direction perpendicular to the axis, cross-sectional images of the contact surface can be obtained at a plurality of positions in the circumferential direction of the shaft and / or the cross-sectional image can be obtained in an annular shape. It is characterized by.

  The receiving portion is formed with a first circumferential engagement portion, and the reverse rotation preventing member is engaged with the first circumferential engagement portion in the circumferential direction. The cylindrical member and the reverse rotation preventing member are fixed in the circumferential direction by the first circumferential engagement portion and the second circumferential engagement portion.

  Further, the receiving portion is formed with a first axial engagement portion, and the reverse rotation preventing member is engaged with the first axial engagement portion and the second axial engagement engageable in the axial direction. The cylindrical member and the reverse rotation preventing member are fixed in the axial direction by the first axial engagement portion and the second axial engagement portion.

  The first axial engagement portion may be engaged with the reverse rotation preventing member in the axial direction by being bent during assembly.

  The first axial engagement portion may be formed along an outer periphery of the reverse rotation preventing member.

  In addition, the reverse rotation preventing member has a seat surface portion that makes contact with the contact surface of the receiving portion in an angular range of at least 180 ° in the circumferential direction, and / or the protruding portion. The engagement edge is in contact with the male screw in an angular range of 360 ° or less [NI2] in the circumferential direction.

  Further, the reverse rotation preventing member has a plurality of engagement edges in the circumferential direction that are in a range of less than 360 ° in the circumferential direction.

  The reverse rotation preventing member includes a seat surface portion that contacts the contact surface of the receiving portion, an axial direction extending from the seat surface portion, and an extension distance in the axial direction that gradually increases along the circumferential direction. And the protruding portion is formed so as to extend radially inward from the standing portion.

  Furthermore, the internal thread body is loosened more than a predetermined amount by setting the extended length of the protruding portion, that is, the protruding length, setting the standing length of the standing portion, setting the relative angle between the protruding portion and the standing portion, etc. By applying the directional torque, the projecting portion is elastically deformed, and the female screw body can be removed from the male screw relatively easily.

  According to the present invention, a single female screw body having two types of female screw structures with different lead angles and / or lead directions can be mass-produced with high quality.

It is (A) front view and (B) top view of the fastening structure to which the internal thread body which concerns on embodiment of this invention is applied. It is (A) front sectional drawing of the fastening structure, and (B) side sectional drawing. It is the (A) top view, (B) front sectional view, and (C) front view of the female screw body. It is the (A) top view, (B) side sectional view, (C) side view, and (C) partial sectional view of the female screw body. It is the (A) front view of the external thread body of the fastening structure, (B) Sectional drawing of only a screw thread, (C) Plan view. It is the (A) side view of the same male screw body, (B) Sectional drawing of only a screw thread, (C) Top view. (A) Front sectional view in the initial state showing the fastening action of the fastening structure, (B) Front sectional view when the female screw body is rotated 90 degrees, (C) Front sectional view when the female screw body is rotated 180 degrees FIG. It is front sectional drawing at the time of rotating a female screw body in the loosening direction in the fastening structure. It is front sectional drawing which shows the other structure of the internal thread body. (A) is front sectional drawing which shows the other structure of the internal thread body, (B) And (C) is a front view which shows the other structure of the internal thread body. It is (A) perspective view which shows the structure of the internal thread body of another fastening structure, (B) Front sectional drawing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a front view of a fastening structure 1 in which a male screw body 100 according to the present embodiment is used. 2A is a front sectional view of the fastening structure 1 and FIG. 2B is a side sectional view. 3 is a front sectional view of the female screw body 100, and FIG. 4 is a side sectional view. FIG. 5 is an enlarged view of the front side of the male screw body 10, and FIG. 6 is an enlarged view of the side surface. As shown in these drawings, the fastening structure 1 fastens the female screw body 100 to the male screw body 10. The female screw body 100 prevents relative rotation in the loosening direction of the male screw body 10 by the tubular member 106 and the reverse rotation preventing member 160.

  As shown in FIGS. 5 and 6, the male screw body 10 is provided with a male screw portion 13 in which a male screw spiral structure is formed from the base side toward the shaft end. In the present embodiment, a first male screw spiral structure 14 serving as a right screw configured to be capable of screwing a female thread-like spiral strip serving as a corresponding right screw into the male screw portion 13, and a female screw shape serving as a corresponding left screw. Two types of male screw spiral structures, the second male screw spiral structure 15 serving as a left-hand thread that can be screwed together, are formed on the same region.

  As shown in FIG. 5C, the male screw portion 13 has a substantially crescent-shaped thread 13 a extending in the circumferential direction in a plane direction perpendicular to the axis (screw shaft) C, on one side of the male screw portion 13 ( They are provided alternately on the left side of the figure and the other side (right side of the figure). By configuring the screw thread 13a in this way, a spiral structure that turns clockwise (see arrow 14 in FIG. 5A) and a spiral structure that turns counterclockwise (see arrow 15 in FIG. 5A). Two types of spiral grooves can be formed between the threads 13a.

  In the present embodiment, two types of male screw spiral structures, the first male screw spiral structure 14 and the second male screw spiral structure 15, are formed in the male screw portion 13 by doing in this way. Accordingly, the male screw portion 13 can be screwed with any of the right and left screw female screw bodies. For details of the male screw portion 13 in which two types of male screw spiral structures are formed, see Japanese Patent No. 4666313 related to the inventor of the present application.

  As shown in FIGS. 3 and 4, the female screw body 100 includes a cylindrical member 106 and a reverse rotation preventing member 160. The tubular member 106 has a so-called hexagonal nut shape and has a through-hole portion 106a at the center. Of course, the general shape of the female screw body 100 is not limited to the hexagonal nut shape, and can be arbitrarily set as appropriate, such as a cylindrical shape, a shape having a knurled circumferential surface, a square shape, and a star shape. A first female screw spiral structure 114 as a right-hand thread is formed in the through-hole portion 106a. That is, the first female screw spiral structure 114 of the tubular member 106 is screwed with the first male screw spiral structure 14 in the male screw portion 13 of the male screw body 10.

  The cylindrical member 106 has a receiving part 110. The receiving part 110 is formed on the end surface in the axial direction of the cylindrical member 106, and has a contact surface 110a that is substantially perpendicular to the rotation axis (not necessarily perpendicular). The abutment surface 110a is a ring-shaped plane here, abuts against the seat surface portion 162 of the reverse rotation prevention member 160, and receives the reverse rotation prevention member 160 in the axial direction. The ring-shaped contact surface 110a may be formed so as to be recessed in the axial end surface.

  Furthermore, the receiving part 110 has a first circumferential engagement part 120 and a first axial engagement part 130. As shown in FIG. 3B, the first circumferential engagement portion 120 is a protrusion that protrudes in the axial direction with respect to the contact surface 110a in this case, and is provided at two intervals of 180 degrees in the circumferential direction. It is formed. Of course, the first circumferential engagement portion 120 is not essential, but a plurality of locations can be provided in the circumferential direction. The first circumferential engagement portion 120 is engaged with the second circumferential engagement portion 162a of the reverse rotation preventing member 160 and engaged in the circumferential direction, thereby restricting relative rotation in the circumferential direction. In addition, although the 1st circumferential direction engaging part 120 was made to protrude with respect to the contact surface 110a here, it can also be depressed. Moreover, the 1st circumferential direction engaging part 120 can also be made into convex shape or a concave shape to an axial direction. For example, as an example, it is also preferable to form irregularities such as embossing, knurling, radial grooves, etc. on the contact surface 110a itself.

  As shown in FIG. 4B, the first axial engagement portion 130 is a member that is disposed to face the contact surface 110a with a minute gap. In this gap, a plate-like seating surface portion 162 (second axial direction engaging portion 162b) of the reverse rotation preventing member 160 is disposed. The contact surface 110a and the first axial engagement portion 130 are configured to sandwich the seat surface portion 162, and the first axial engagement portion 130 engages with the second circumferential engagement portion 162b in the axial direction. As shown in FIG. 4D, the first axial engagement portion 130 is a peripheral wall-like portion that extends substantially perpendicular to the receiving portion 110 before assembly. The peripheral wall-like portion is erected in the circumferential direction along the outer peripheral edge of the seat surface portion 162 of the reverse rotation preventing member 160. At the time of assembly, after the reverse rotation preventing member 160 is disposed, the first axial engagement portion 130 is bent inward in the radial direction as shown by a dotted line, and the two are tightened in the axial direction by crimping each other. . Here, the first axial engagement portion 130 is exemplified here in the case where the peripheral wall-shaped portion having a range of about 90 ° in the circumferential direction is provided at two locations. However, as shown in FIG. It is also preferable to arrange over the circumference (360 °), and it is also preferable to arrange intermittent peripheral wall portions over the entire circumference.

  Next, the reverse rotation preventing member 160 will be described. The reverse rotation preventing member 160 includes a seat surface portion 162, a standing portion 165, and a protruding portion 168.

  As shown in FIG. 4A, the seat surface portion 162 is a ring-shaped plate portion that abuts against the abutment surface 110a of the receiving portion 110, and the second axial engagement portion 162b is partly and / or entirely. Configure. The second axial engagement portions 162b are engaged with each other in the axial direction by being sandwiched (overlapping in the axial direction) by the first axial engagement portion 130. The seat surface portion 162 is preferably brought into contact with the contact surface 110a of the receiving portion 110 in the circumferential direction at an angle range of 180 ° or more, for example, 360 °, thereby stabilizing the posture and the first axial direction engagement. The engagement state with the joint portion 130 is maintained.

  A second circumferential engagement portion 162 a is formed on the outer peripheral edge of the seat surface portion 162. The second circumferential engagement portion 162a has a concave notch that is displaced radially inward of the outer peripheral edge of the seat surface portion 162, and engages with the first circumferential engagement portion 120 of the receiving portion 110 in the circumferential direction. To do. In addition, although the notch which becomes a concave inside radial direction is illustrated here, the protrusion which becomes convex on the radial direction outer side may be sufficient, and it may be convex or concave shape on an axial direction, and is not essential. As an example in which the second circumferential engagement portion 162a is convex or concave in the axial direction, irregularities such as embossing, knurling, radial grooves, etc. are formed on the plane facing the contact surface 110a in the seating surface portion 162. It is also preferable.

  As shown in FIG. 4B, the standing portion 165 is a substantially cylindrical portion extending in the axial direction from the seat surface portion 162. The extending distance J in the axial direction becomes gradually longer (or shorter) along the circumferential direction. As a result, the end edge 165a of the standing portion 165 opposite to the seat surface portion 162 is inclined with respect to the seat surface portion 162, and this inclination angle α is set corresponding to the lead angle of the second male screw spiral structure 115. Is done. That is, the end edge 165a is a spiral extending in the range of about 360 degrees in the circumferential direction. The standing portion 165 may be formed with an axial notch 165b. In this case, the standing portion 165 is elastically deformed radially outward by actively reducing the rigidity in the radial direction. Can be made easier. The notches 165b are formed at two places in the circumferential direction here, but may be formed at one place, at three places or more, or at zero places.

  The protruding portion 168 is a plate portion that protrudes radially inward from the end edge 165 a of the standing portion 165. As shown in FIG. 3A, the projecting portion 168 has a concave shape formed by extending the notch 165b of the standing portion 165 or by notching the end of the projecting portion 168 radially outward. This is composed of two partial arc-shaped plate portions having an angle range of about 180 ° or less divided by two slits in the circumferential direction. A radially inner side of each projecting portion 168 becomes a projecting end, thereby forming a plurality of engaging edges 168a. As a result, each engagement edge 168a becomes a partial arc having an angle range of 180 ° or less in the circumferential direction, and comes into contact with the outer periphery of the male screw body 10. As described above, by setting the circumferential distance of each engagement edge 168a to 180 ° or less, it becomes easy to displace radially outward. The diameter of the engagement edge 168a is substantially matched with the root diameter of the second male screw spiral structure 15 of the male screw body 10.

  Further, the protruding portion 168 is inclined in the direction away from the virtual plane formed by the seating surface portion 162 along the radial direction. The inclination angle β in the radial direction almost coincides with the flank angle of the thread 13a of the second male screw spiral structure 15 of the male screw body 10, and is set to about 30 degrees here. Further, the engagement edge 168a is formed with a second female screw spiral structure 115 of a left-hand thread having a lead angle α in accordance with the inclination angle α of the end edge 165a of the standing portion 165. The engaging edge 168 a is screwed with the second male screw spiral structure 15 in the male screw portion 13 of the male screw body 10.

  Next, the operation of the fastening structure 1 will be described.

  As shown in FIG. 7A, when the first female screw spiral structure 114 of the cylindrical member 106 of the female screw body 100 is screwed into the first male screw spiral structure 14 of the male screw body 10, the reverse rotation preventing member 160. The engaging edge 168a of the male screw body 10 contacts the second male screw spiral structure 15 of the male screw body 10. However, since the female screw body 100 is screwed with the first female screw spiral structure 114 of the cylindrical member 106 as a reference, when the cylindrical member 106 is screwed, the engaging edge 168a and the second male screw helical structure are 15 threads transition to the interference state [s3].

  In this state, when the cylindrical member 106 is further rotated by 90 ° and the first female screw spiral structure 114 is screwed into the first male screw spiral structure 14, as shown in FIG. 106 advances by 1/4 pitch in the fastening direction, and the reverse rotation preventing member 160 forcibly advances in the fastening direction while rotating in the same direction. At this time, since the engagement edge 168a is inclined in the direction away from the seat surface portion 162, the engagement edge 168a is elastically deformed along the flank surface of the screw thread 13a in the axial direction and / or radially outward from the contact surface 110a. Then, [s4] tries to get over the second male screw spiral structure 15. At this time, it is preferable that the standing portion 165 has increased rigidity on the outer side in the radial direction so that the amount of elastic deformation of the standing portion 165 itself is set to be small or substantially zero, and the engagement edge 168a is raised. Prioritizing elastic deformation to the obtuse angle side with respect to the installation part 165 is given priority. When the cylindrical member 106 is rotated 180 degrees (1/2 pitch) with the state of FIG. 7A as a reference, the engagement edge 168a of the second male screw spiral structure 15 is formed as shown in FIG. [s5] One screw thread 13a is completely overcome and fitted into the next second male screw spiral structure 15. By repeating this operation, each time the female screw body 10 rotates 180 °, the engaging portion 168a gets over the thread 13a of the second male screw spiral structure 15, and the female screw body 100 is fastened to the male screw body 10. .

  On the other hand, with reference to FIG. 8, consider a case where the cylindrical member 106 of the female screw body 100 is about to rotate in the loosening direction with respect to the first male screw spiral structure 14 of the male screw body 10. The protruding portion 168 has a shape that is inclined such that the tip side (engagement edge 168a side) is deviated from the virtual plane formed by the contact surface 110a. It is set so as to correspond to the flank surface of the screw thread 13a, and preferably set so as to abut. In addition, the length from the base end (end edge 165a of the standing portion 165) to the tip end (engagement edge 168a) of the projecting portion 168 is set corresponding to the distance from the top of the thread 13a to the valley bottom, Preferably, it is set so as to substantially match the distance. Therefore, when the cylindrical member 10 of the female screw body 100 is subjected to relative rotation in the loosening direction, the inclined surface of the projecting portion 168 approaches the virtual plane formed by the contact surface 110a with respect to the standing portion 165 (that is, The engagement edge 168a is elastically deformed by receiving a force in a direction in which the engagement edge 168a approaches the contact surface 110a. By increasing the rigidity of the standing portion 165 radially outward, the distance in the imaginary plane direction from the proximal end of the protruding portion 168 to the distal end (horizontal distance in FIG. 8) increases with the elastic deformation. Therefore, the engagement edge 168a acts to narrow the valley of the screw thread 13a, and as a result, the relative rotation in the loosening direction can be firmly prevented mechanically. In other words, the engagement edge 168a of the reverse rotation preventing member 160 bites into the valley of the thread 13a of the second male screw spiral structure 15, and the relative rotation is caused by the shift or reciprocal movement of the tubular member 106 and the reverse rotation preventing member 160. To regulate. Therefore, the male screw body 100 cannot be relatively rotated in the loosening direction. The reverse rotation preventing member 160 allows relative rotation with the male screw body 10 in one direction (fastening direction) by the first female screw spiral structure 114 of the cylindrical member 106, and the reverse rotation is securely locked. In the female screw body 100, the extension length of the protruding portion 168, that is, the protruding length, the setting of the standing length of the standing portion 165, the setting of the relative angle between the protruding portion 168 and the standing portion 165, etc. It is also possible to remove the female screw body 100 from the male screw body 10 relatively easily by elastically deforming the protruding portion 168 by applying a loosening direction torque of a predetermined value or more.

  According to the female screw body 100 of the present embodiment, in a range including the contact surface 110a of the receiving portion 110, when viewed from a cross section in a direction perpendicular to the axis, cross-sectional images of the contact surface 110a are displayed at a plurality of locations in the circumferential direction. The obtained state and / or the cross-sectional image is obtained in an annular shape. Therefore, since the holding posture of the reverse rotation preventing member 160 by the contact surface 110a is stabilized, the assembling can be easily performed and the assembling accuracy can be improved. In the present embodiment, since the cross-sectional image of the contact surface 110a has an annular shape (ring shape), it can be said that the most stable state is obtained.

  Further, as in the present embodiment, when the contact surface 110a is a plane perpendicular to the rotation axis at the end surface of the cylindrical member 106, the cylindrical member 106 is subjected to pressing, cutting, rolling, forging, molding, modeling, or the like. Can be produced in a simple manner like so-called nuts. If the contact surface 110a is inclined with respect to the direction perpendicular to the axis and the contact surface 110a is used to form a circumferential slope with the lead angle and lead direction of the engagement edge 168a set, The manufacturing cost of the cylindrical member 106 increases. Further, when viewed from a cross section perpendicular to the axis within a range including the slope-shaped contact surface 110a, only one cross-sectional image is obtained in the circumferential direction. This is because the holding posture of the reverse rotation preventing member 160 by the contact surface 110a is unstable, and a force that causes the reverse rotation preventing member 160 to slide in the circumferential direction along the slope is likely to occur. After all, when assembling the cylindrical member 106 and the reverse rotation preventing member 160, high positioning accuracy is required.

  Incidentally, in the present embodiment, the lead direction and lead angle of the second female screw spiral structure 115 are set by the standing portion 165 in which the axial extending distance J gradually increases along the circumferential direction. If this structure is adopted, for example, the reverse rotation preventing member 160 can be mass-produced by press molding using a plate-like member, and the manufacturing cost can be drastically reduced.

  Further, the internal thread body 100 is not essential, but the first circumferential direction engaging portion 120 on the cylindrical member 106 side and the second circumferential direction engaging portion 162a on the reverse rotation preventing member 160 side are connected to the cylindrical member 106. The reverse rotation preventing member 160 can be fixed in the circumferential direction. As a result, relative rotation between the cylindrical member 106 and the reverse rotation prevention member 160 can be restricted even when the engagement edge 168a of the reverse rotation prevention member 160 is caused to interfere and forcibly tightening.

  Similarly, the cylindrical member 106 and the reverse rotation prevention member 160 are fixed in the axial direction by the first axial engagement portion 130 on the cylindrical member 106 side and the second axial engagement portion 162b of the reverse rotation prevention member 160. Has been. As a result, even when the cylindrical member 106 is forcibly screwed to displace the engagement edge 168a of the reverse rotation prevention member 160 in the radial direction, the cylindrical member 106 and the reverse rotation prevention member 160 are separated in the axial direction. Can be prevented. In the present embodiment, since the first axial engagement portion 130 is bent and caulked with each other during assembly, both can be reliably integrated in spite of a simple manufacturing process.

  In particular, the seat surface portion 162 of the reverse rotation preventing member 160 of the present embodiment is in contact with the contact surface 110a of the receiving portion 110 at least in the circumferential direction at an angle range of 180 degrees or more. As described above, when the seat surface portion 162 is set to an angle range of 180 ° or more, even when an external force is applied to the reverse rotation preventing member 160, the engagement state with the first axial engagement portion 130 is difficult to be released. On the other hand, the engagement edge 168a of the reverse rotation preventing member 160 can be easily displaced flexibly outward in the axial direction and / or in the radial direction by contacting with the male screw 10 in an angular range of 180 ° or less in the circumferential direction. I can do it. That is, according to the reverse rotation preventing member 160 of the present embodiment, the engagement edge 168a can be easily displaced while being reliably integrated with the cylindrical member 106. In addition, by arranging a plurality of engagement edges 168a in the circumferential direction at this time, when the female screw body 100 rotates in the loosening direction, the plurality of engagement edges 168a reliably engage with the male screw body 10, Rotation can be regulated. Further, since the angular relationship between the engaging edge 168 and the standing portion 165 is set to be an obtuse angle, the engaging edge 168 is elastic in the axial direction away from the standing portion 165 (the direction in which the angular relationship between the two approaches 180 °). Although it is easy to deform | transform, there exists an advantage that it is hard to elastically deform in the axial direction (direction where both relationship approaches 90 degrees) which approaches the standing part 165. FIG.

  In the male screw body 10 and the female screw body 100 of the above-described embodiment, the first male screw and female screw helical structures 14 and 114 and the second male screw and female screw helical structures 15 and 115 are in a reverse screw relationship (with the same lead angle). Although the case where the lead direction is opposite is illustrated, the present invention is not limited to this. For example, as shown in FIG. 9, first male screw and female screw spiral structures 14 and 114 and second male screw and female screw spiral structures 15 and 115 having the same lead direction and different lead angles may be employed. In this case, the first male screw spiral structure 14 having the lead L1 (lead angle θ1) and the lead are further formed by superimposing a spiral line on the spiral thread 13a formed by the first male screw spiral structure 14. The second male screw spiral structure 15 of L2 (lead angle θ2) can be formed with the screw directions aligned.

  Furthermore, in the female screw body 100 of the above embodiment, according to the female screw body 100 of the present embodiment, the cross-sectional image of the axial vertical cross section in the range including the contact surface 110a is a flat ring shape that matches the contact surface 100a. However, the present invention is not limited to this. For example, like the female screw body 100 shown in FIG. 10A, the contact surface 110a can be a tapered surface inclined in the radial direction. In this case, the cross-sectional image of the axial vertical cross section XX is an annular line. Furthermore, the contact surface 110a can be made into the inclined surface which inclines in one direction with respect to an axis | shaft like the internal thread body 100 shown, for example in FIG.10 (B). In this case, the cross-sectional image of the axial vertical cross section XX of the contact surface 110a is two line segments. Furthermore, for example, like the female screw body 100 shown in FIG. 10C, the contact surface 110a can be a pair of inclined surfaces that are inclined in one direction and the other direction with respect to the axis. In this case, the cross-sectional images of the axial vertical cross section XX of the contact surface 110a are four line segments. In any case, when the abutment surface 110a is viewed from a cross section in the axis-perpendicular direction, an opportunity to obtain cross-sectional images at a plurality of locations in the circumferential direction is provided, so that the holding posture of the reverse rotation preventing member 160 is stabilized. Can be made.

  Further, the embodiments of the present invention are not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fastening structure 10 Male thread body 13 Male thread part 14 First male thread spiral structure 15 Second male thread spiral structure 100 Female thread body 106 Cylindrical member 110 Receiving part 110a Contact surface 114 First female thread spiral structure 115 Second female thread spiral structure 120 First Circumferential engagement portion 130 First axial engagement portion 160 Reverse rotation prevention portion 162 Seat surface portion 162a Second circumferential engagement portion 162b Second axial engagement portion 165 Standing portion 168 Protruding portion 168a Engagement edge

Claims (8)

An internal thread spiral structure set in an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole of the tubular member;
A receiving portion having a contact surface formed on an end surface of the cylindrical member in the axial direction of the hole;
A projecting portion disposed on the contact surface and extending radially inward toward the shaft; and a lead angle different from the lead angle and / or the lead direction by a projecting end of the projecting portion; An anti-rotation member that constitutes an intermittent or continuous helical engagement edge set in the lead direction,
The engagement edge can be elastically deformed so that the protruding end side rotates with respect to a direction deviating from the contact surface with the base end side as a fulcrum, and when the male screw is screwed, the elastic deformation is repeated. A female screw body, wherein the female screw body is screwed to allow relative rotation in one direction of the female screw spiral structure and to lock relative rotation in the other direction. When the contact surface is viewed by a cross section in a direction perpendicular to the axis, cross-sectional images of the corresponding contact surface are obtained at a plurality of circumferential positions of the shaft and / or the cross-sectional image is obtained in an annular shape. And
The internal thread body according to claim 1. The receiving portion is formed with a first circumferential engaging portion,
The reverse rotation preventing member is formed with a second circumferential engagement portion that is engageable with the first circumferential engagement portion in the circumferential direction,
The cylindrical member and the reverse rotation preventing member are fixed in the circumferential direction by the first circumferential engagement portion and the second circumferential engagement portion,
The internal thread body according to claim 1 or 2. A first axial engagement portion is formed in the receiving portion,
The reverse rotation prevention member is formed with the first axial engagement portion and a second axial engagement portion engageable in the axial direction,
The cylindrical member and the reverse rotation preventing member are fixed in the axial direction by the first axial engagement portion and the second axial engagement portion.
The internal thread body according to any one of claims 1 to 3. The first axial direction engaging portion is engaged with the reverse rotation preventing member in the axial direction by being bent at the time of assembly.
The internal thread body according to claim 4. The first axial engagement portion is formed along an outer periphery of the reverse rotation preventing member.
The internal thread body according to claim 4 or 5.
[NI6] The reverse rotation preventing member has a plurality of engagement edges in the circumferential direction that are less than 360 ° in the circumferential direction.
The male screw body according to any one of claims 1 to 6. The reverse rotation preventing member is
A seat surface portion that contacts the contact surface of the receiving portion;
An extending portion extending in the axial direction from the seating surface portion, and the extending distance in the axial direction gradually increases along the circumferential direction,
The protruding portion is formed to extend radially inward from the standing portion,
The internal thread body according to any one of claims 1 to 7.

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