Male threaded member, female threaded member, fastener

Abstract

To provide a male screw-side member that can shorten the time required for fastening. [Solution] The screw portion 11 comprises a male thread surface 21 which is arranged in a part of the outer circumference direction and on which the male thread side threads 23 are formed, and an outer peripheral piece 22 which is arranged alternately with the male thread surface 21 in the outer circumference direction of the screw portion 11 to form the outer circumference of the screw portion 11 and on which the male thread side threads 23 are not formed. The male thread side threads 23 extend such that the screwing direction with the female thread side threads 43 is inclined toward the rear in the axial direction from a virtual plane S1 which is perpendicular to the axial direction of the screw portion 11, and the projected shape of the screw portion 11 as viewed from the radially outside is formed to become thinner from the rear end 32 toward the tip 31 in the screwing direction.

Description

Technical Field

[0001] The present invention relates to a male screw side member, a female screw side member, and a fastener.

Background Art

[0002] A fastener fastens by screwing a male screw and a female screw together. Regarding this fastener, for example, in Patent Document 1 below, a technique for preventing loosening after the male screw and the female screw are fastened is disclosed.

Prior Art Documents

Patent Documents

[0003] [[ID=2));

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In conventional fasteners such as Patent Document 1 above, the thread of the male screw and the thread of the female screw are screwed together so as to rotate relative to each other by the length of each other, and thus, when these threads are long, it takes time to fasten.

[0005] Therefore, an object of the present invention is to provide a male screw side member, a female screw side member, and a fastener that can shorten the time required for fastening.

Means for Solving the Problems

[0006] To solve the above problems, the male screw-side member according to the first aspect of the present invention comprises a male screw surface arranged in a part of the outer circumference of the screw portion and on which the male screw-side threads are formed, and outer peripheral pieces arranged alternately with the male screw surface in the outer circumference of the screw portion to form the outer circumference of the screw portion and on which the male screw-side threads are not formed, wherein the male screw-side threads extend such that the screwing direction with the female screw-side threads is inclined toward the rear in the axial direction from a virtual plane perpendicular to the axial direction of the screw portion, and the projected shape of the screw portion as viewed from the radially outside is formed to become thinner from the rear end toward the tip in the screwing direction.

[0007] Furthermore, in a second aspect of the present invention, the head is further connected to the threaded portion from the rear side in the axial direction and has a larger outer diameter than the threaded portion, and the threads on the male threaded portion are formed in a position in which the threads on the male threaded portion can be screwed into the threads on the female threaded portion, from a state in which the head is in contact with the female threaded portion.

[0008] Furthermore, in the third aspect of the present invention, the front surface of the thread on the male screw side in the axial direction has a chamfered shape on the radially outer side.

[0009] Furthermore, in a fourth aspect of the present invention, the projected shape of the rear end as viewed from the radially outer side is a shape in which both ends are chamfered.

[0010] Furthermore, in the fifth aspect of the present invention, the projected shape of the tip as viewed from the radially outer side is a shape in which both ends are chamfered.

[0011] Furthermore, in the sixth aspect of the present invention, the projected shape of the rear end as viewed from the radially outer side is arc-shaped.

[0012] Furthermore, in the seventh aspect of the present invention, the radius of curvature of the arc shape is 0.5 or more and 2.0 or less.

[0013] Furthermore, in the eighth aspect of the present invention, the inclination angle of the threads on the male screw side with respect to the virtual plane is 1.5° or more and 3.0° or less.

[0014] Furthermore, the female thread side member according to the ninth aspect of the present invention comprises a female thread surface arranged in a part of the inner circumferential direction of the screw hole, on which female threads are formed, and inner circumferential pieces arranged alternately with the female thread surface in the inner circumferential direction of the screw hole to form the inner circumference of the screw hole, on which female threads are not formed, wherein the female threads extend such that the screwing direction with the male threads is inclined forward in the axial direction from a virtual plane perpendicular to the axial direction of the screw hole, and the projected shape viewed from the radially inside of the screw hole is formed to become thinner from the rear end to the front end in the screwing direction.

[0015] Furthermore, in the tenth aspect of the present invention, the front surface of the thread on the female screw side in the axial direction has a chamfered shape on the radially inward side.

[0016] Furthermore, in the eleventh aspect of the present invention, the projected shape of the rear end as viewed from the radially inward side is a shape in which both ends are chamfered.

[0017] Furthermore, in the twelfth aspect of the present invention, the projected shape of the tip as viewed from the radially inward side is a shape in which both ends are chamfered.

[0018] Furthermore, in the thirteenth aspect of the present invention, the projected shape of the rear end as viewed from the radially inward side is arc-shaped.

[0019] Further, the fastener according to the fourteenth aspect of the present invention includes a male thread surface that is disposed on a part in the outer circumferential direction of the threaded portion and on which a male thread flank on the male thread side is formed, and an outer circumferential piece that forms the outer circumference of the threaded portion by being alternately disposed with the male thread surface in the outer circumferential direction of the threaded portion and on which the male thread flank on the male thread side is not formed. The male thread flank on the male thread side extends such that the screwing direction with the female thread flank on the female thread side is inclined toward the rear side in the axial direction with respect to a virtual plane orthogonal to the axial direction of the threaded portion, and the projection shape seen from the outer side in the radial direction of the threaded portion is formed to become thinner from the rear end to the front end in the screwing direction. The male thread side member includes a female thread surface that is disposed on a part in the inner circumferential direction of the threaded hole and on which a female thread flank on the female thread side is formed, and an inner circumferential piece that forms the inner circumference of the threaded hole by being alternately disposed with the female thread surface in the inner circumferential direction of the threaded hole and on which the female thread flank on the female thread side is not formed. The female thread flank on the female thread side extends such that the screwing direction with the male thread flank on the male thread side is inclined toward the front side in the axial direction with respect to a virtual plane orthogonal to the axial direction of the threaded hole, and the projection shape seen from the inner side in the radial direction of the threaded hole is formed to become thinner from the rear end to the front end in the screwing direction. The female thread side member is provided.

Advantages of the Invention

[0020] According to the male thread side member, the female thread side member, and the fastener according to the present invention, the time required for fastening can be shortened.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic view showing the appearance of the male thread side member according to the first embodiment of the present invention. [Figure 2] It is a view taken in the direction of arrow II-II in FIG. 1. [Figure 3] It is an enlarged view showing the male thread flank on the male thread side in FIG. 1. [Figure 4] It is an enlarged view of a portion IV in FIG. 1. [Figure 5] It is a schematic view showing an axial cross-sectional view of the female thread side member according to the first embodiment of the present invention. [Figure 6] It is a VI-VI arrow view in FIG. 5. [Figure 7] It is a schematic view showing the first state of the fastener according to the first embodiment of the present invention. [Figure 8] It is a schematic view showing the second state of the fastener according to the first embodiment of the present invention. [Figure 9] It is an enlarged view showing the thread on the male thread side and the thread on the female thread side in the screwed state. [Figure 10] It is a schematic view showing the third state of the fastener according to the first embodiment of the present invention. [Figure 11] It is a view corresponding to FIG. 2 showing the male thread side member according to the second embodiment of the present invention. [Figure 12] It is an enlarged view showing the thread on the male thread side according to the third embodiment of the present invention. [Figure 13] It is an enlarged view showing the thread on the male thread side according to the fourth embodiment of the present invention. [Figure 14] It is an enlarged view corresponding to FIG. 4 showing the thread on the male thread side according to the fourth embodiment of the present invention. [Figure 15] It is an enlarged view showing the thread on the male thread side according to the fifth embodiment of the present invention.

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same reference numerals are given to the same components in each drawing as much as possible, and redundant descriptions are omitted as appropriate.

[0023] ===First Embodiment=== Hereinafter, the first embodiment of the present invention will be described.

[0024] ≪Overall Configuration≫ The fastener according to the first embodiment of the present invention includes a male thread side member and a female thread side member as main parts.

[0025] ≪Configuration of Male Thread Side Member≫ First, the male screw-side member according to the first embodiment of the present invention will be described. Figure 1 is a schematic diagram showing a male screw-side member 1 according to the first embodiment of the present invention. Figure 2 is a view along the line II-II in Figure 1.

[0026] As shown in Figures 1 and 2, the male screw-side member 1 is mainly comprised of a threaded portion 11 and a head 12.

[0027] The threaded portion 11 extends axially such that, in the outer circumference direction, male threaded surfaces 21 on which the threads 23 on the male thread side are formed and outer peripheral pieces 22 on which no threads 23 are formed are arranged alternately.

[0028] The male thread surface 21 is located on a portion of the outer circumference of the threaded portion 11 and is the surface on which the threads 23 on the male thread side are formed. The outer peripheral pieces 22 are arranged alternately with the male thread surface 21 on the outer circumference of the threaded portion 11 to form the outer circumference of the threaded portion 11 and are surfaces on which the threads 23 on the male thread side are not formed. Roughly speaking, the outer peripheral pieces 22 have a shape in which a portion of the outer circumference of a cylindrical outer surface has been cut off.

[0029] Furthermore, as shown in Figure 2, the outer surface of the threaded portion 11 has a shape in which three male threaded surfaces 21 and three outer peripheral pieces 22 are arranged alternately in the circumferential direction.

[0030] The head 12 is connected to the threaded portion 11 from the rear in the axial direction and has a cylindrical shape with a larger outer diameter than the threaded portion 11.

[0031] Figure 3 is an enlarged view showing the threads 23 on the male screw side in Figure 1. Figure 4 is an enlarged view of section IV in Figure 1.

[0032] As shown in FIG. 3, the thread 23 on the male screw side extends such that the screwing direction with the thread 43 on the female screw side described later is inclined toward the rear side in the axial direction with respect to the virtual plane S1 orthogonal to the axial direction of the threaded portion 11. The inclination angle θ of the thread 23 on the male screw side with respect to the virtual plane S1 is preferably 1.5° or more and 3.0° or less.

[0033] Further, the thread 23 on the male screw side is formed such that the projected shape (FIG. 3) when viewed from the outside in the radial direction of the threaded portion 11 becomes thinner as it goes from the rear end 32 to the front end 31 in the screwing direction. That is, a < b in FIG. 3. Here, "the projected shape (FIG. 3) when viewed from the outside in the radial direction becomes thinner as it goes from the rear end to the front end in the screwing direction" means that the width (a, b) in the direction orthogonal to the screwing direction and the radial direction of the threaded portion 11 becomes shorter (a < b) as it goes from the rear end 32 to the front end 31 in the screwing direction, and it is formed in a tapered shape.

[0034] And the thread 23 on the male screw side is formed at a position where it can be screwed with the thread 43 on the female screw side described later in a state where the head 12 abuts on the female screw side member 2 described later.

[0035] Furthermore, as shown in FIG. 4, the front side surface 33 in the axial direction of the thread 23 on the male screw side has a chamfered shape on the outer side in the radial direction.

[0036] ≪Configuration of Female Screw Side Member≫ Next, the configuration of the female screw side member 2 according to the first embodiment of the present invention will be described.

[0037] FIG. 5 is a schematic view showing an axial cross-sectional view of the female screw side member 2 according to the first embodiment of the present invention. FIG. 6 is a view taken in the direction of the arrow VI-VI in FIG. 5.

[0038] As shown in FIGS. 5 and 6, the female screw side member 2 includes a threaded hole 44 as a main part.

[0039] The screw hole 44 extends axially such that, in the inner circumferential direction, female screw surfaces 41 on which the female screw threads 43 are formed and inner circumferential pieces 42 on which no screw threads 43 are formed are arranged alternately. The female screw surface 41 is formed in a shape that allows it to be screwed into the male screw surface 21.

[0040] The female thread surface 41 is located in a portion of the inner circumference of the screw hole 44 and is the surface on which the female threads 43 are formed. The inner circumferential pieces 42 are arranged alternately with the female thread surface 41 in the inner circumference of the screw hole 44 to form the inner circumference of the screw hole 44 and are surfaces on which the female threads 43 are not formed. Roughly speaking, the inner circumferential pieces 42 have a shape in which a portion of the inner surface of a cylindrical shape has been cut off in the circumferential direction.

[0041] Furthermore, as shown in Figure 6, the inner circumferential surface of the screw hole 44 has a shape in which three female screw surfaces 41 and three inner circumferential pieces 42 are arranged alternately in the circumferential direction.

[0042] The female threads 43 extend in a direction forward in the axial direction relative to a virtual plane S2 perpendicular to the axial direction of the screw hole 44, in which the threading direction with the male threads 23 is perpendicular (although not explicitly shown in the figure, this inclination angle corresponds to the inclination angle θ of the male threads 23).

[0043] Furthermore, the threads 43 on the female thread side are formed such that the projected shape, when viewed from the radially inner side of the thread hole 44, becomes thinner from the rear end to the front end in the threading direction.

[0044] Furthermore, the front surface 53 of the thread 43 on the female screw side has a chamfered shape on its radially inward side (see Figure 9, described later).

[0045] Preferred configurations for the male threaded member and the female threaded member. The following describes preferred configurations for the male threaded member 1 and the female threaded member 2.

[0046] In the threaded portion 11, it is preferable that each outer peripheral piece 22 be longer than each male threaded surface 21. In particular, in the circumferential direction of the threaded portion 11, it is preferable that the total length of the three outer peripheral pieces 22 be longer than half of the total circumference and less than or equal to two-thirds of the total circumference. Making this length longer than half of the total circumference makes it easier to insert the threaded portion 11 into the threaded hole 44. Also, making this length less than or equal to two-thirds of the total circumference allows the fastening force between the threaded portion 11 (male threaded surface 21) and the threaded hole 44 (female threaded surface 41) to be maintained.

[0047] Furthermore, in the screw hole 44, it is preferable that each inner circumferential piece 42 is longer than each female screw surface 41. In particular, in the circumferential direction of the screw hole 44, it is preferable that the total length of the three inner circumferential pieces 42 be longer than half of the total circumference and less than or equal to two-thirds of the total circumference. By making this length longer than half of the total circumference, it becomes easier to insert the threaded portion 11 into the screw hole 44. Also, by making this length less than or equal to two-thirds of the total circumference, the fastening force between the threaded portion 11 (male screw surface 21) and the screw hole 44 (female screw surface 41) can be maintained.

[0048] More preferably, in the threaded portion 11, each outer peripheral piece 22 is about 1% longer than each male threaded surface 21, and in the threaded hole 44, each inner peripheral piece 42 is about 1% longer than each female threaded surface 41.

[0049] Furthermore, the axial length of the threaded portion 11 may be approximately 2.1 times the axial length of a conventional threaded portion. The longer the threaded portion 11 is in the axial direction, the greater the fastening force between the male threaded member 1 and the female threaded member 2. Therefore, if each male threaded surface 21 and each outer peripheral piece 22, and each female threaded surface 41 and each inner peripheral piece 42 are the same length in the circumferential direction, then setting the axial length of the threaded portion 11 to twice the axial length of a conventional threaded portion will result in a fastening force equivalent to that of a conventional fastener. However, as described above, if each outer peripheral piece 22 is made approximately 1% longer than each male threaded surface 21, and each inner peripheral piece 42 is made approximately 1% longer than each female threaded surface 41, then setting the axial length to approximately 2.1 times will result in a fastening force equivalent to that of a conventional fastener.

[0050] Furthermore, the chamfered portion of surface 33 may be a flat surface such as a C-chamfer, as shown in Figure 4, or it may be a curved surface such as an R-chamfer. The same applies to surface 53. The above is a description of the configuration of the fastener according to the first embodiment of the present invention.

[0051] ≪Contracting Procedure≫ Next, the fastening procedure of the fastener according to the first embodiment of the present invention will be explained with reference to Figures 7 to 10, etc.

[0052] Figure 7 is a schematic diagram showing the first state of the fastener according to the first embodiment of the present invention. Figure 8 is a schematic diagram showing the second state of the fastener according to the first embodiment of the present invention. Figure 9 is an enlarged view showing the threads 23 on the male screw side and the threads 43 on the female screw side in a screwed state. Figure 10 is a schematic diagram showing the third state of the fastener according to the first embodiment of the present invention.

[0053] When fastening the male threaded member 1 to the female threaded member 2, the worker first inserts the threaded portion 11 of the male threaded member 1 linearly along the axial direction into the threaded hole 44 of the female threaded member 2 at an angle such that the male threaded surface 21 and the inner circumferential piece 42, and the outer circumferential piece 22 and the female threaded surface 41 face each other (see dashed arrow in Figure 7). The "angles that face each other" refer to, for example, the angle of the male threaded member 1 as shown in Figure 1 or Figure 2, and the angle of the female threaded member 2 as shown in Figure 5 or Figure 6.

[0054] As shown in Figure 7, the front end surface 51 (the axially forward end surface of the threaded portion 11) of the head 12 of the male threaded member 1 comes into contact with the front end surface 52 (the axially forward end surface of the threaded hole 44) of the female threaded member 2. This prevents the male threaded member 1 from advancing any further. This is referred to as the first state. However, in the first state, the male threaded member 1 and the female threaded member 2 are not yet fastened together.

[0055] From the first state, the operator rotates the screw portion 11 and the screw hole 44 relative to each other by twisting the head 12 as shown by the dashed arrow in Figure 8, so that each male screw surface 21 and each female screw surface 41 are screwed together. This allows the threads 23 on each male screw side and the threads 43 on each female screw side to be screwed together (fastened), as shown in Figure 9. In other words, the screw portion 11 and the screw hole 44 can be fastened together. This is the second state.

[0056] Furthermore, as described above, the screwing direction is inclined with respect to the virtual plane S1, causing the male screw-side member 1 to return to the rearward side in the axial direction (i.e., the rearward side in the insertion direction) during screwing. As a result, in the second state, a gap is created between the front end surface 51 of the head 12 and the front end surface 52 of the female screw-side member 2.

[0057] As shown in Figure 10, a notch is formed in a roughly circular ring, allowing a deformable snap ring 61 to be fitted into the gap.

[0058] <Effects> The male threaded member 1 according to the first embodiment of the present invention comprises a male threaded surface 21 which is arranged in a part of the outer circumference of the threaded portion 11 and on which the male threaded threads 23 are formed, and outer peripheral pieces 22 which are arranged alternately with the male threaded surface 21 in the outer circumference of the threaded portion 11 to form the outer circumference of the threaded portion 11 and on which the male threaded threads 23 are not formed. The male threaded threads 23 extend such that the screwing direction with the female threaded threads 43 is inclined toward the rear in the axial direction from a virtual plane S1 which is perpendicular to the axial direction of the threaded portion 11, and the projected shape of the threaded portion 11 as viewed from the radially outside is formed to become thinner from the rear end 32 toward the tip 31 in the screwing direction. In conventional male screw-side members, the threads are continuous in a spiral shape, whereas in the first embodiment, the threaded portion 11 is provided with an outer peripheral piece 22, resulting in shorter threads 23 (when the axial length is the same as that of a conventional threaded portion). Therefore, the male screw-side member 1 according to the first embodiment can shorten the time required for fastening compared to conventional methods. In other words, in the first embodiment, when fastening the male threaded member 1 to the female threaded member 2, first, the threaded portion 11 of the male threaded member 1 is inserted linearly into the threaded hole 44 of the female threaded member 2. From that state, the male threaded member 1 is rotated relative to the female threaded member 2, thereby screwing (fastening) the threads 23 and 43 together. This reduces the time required for screwing. Furthermore, when performing this screwing, the fact that the tip 31 side of the male thread 23 is thinner and the rear end 32 side is thicker in the screwing direction makes screwing easier (making it easier to insert the male thread 23 into the female thread 43). Furthermore, due to the inclination in the threading direction described above, the male threaded member 1 returns to the rearward side in the axial direction during threading. This creates a gap (axial gap) between the male threaded member 1 (head 12) and the female threaded member 2, allowing a snap ring 61 or the like to be inserted into this gap, thus improving convenience.

[0059] Furthermore, the male threaded member 1 according to the first embodiment of the present invention is further provided with a head 12 that is connected to the threaded portion 11 from the rear side in the axial direction and has a larger outer diameter than the threaded portion 11, and the threads 23 on the male threaded side are formed in a position where the threads 23 on the male threaded side can be screwed into the threads 43 on the female threaded side, from a state in which the head 12 abuts against the female threaded member 2. As a result, when inserting the threaded portion 11 of the male threaded member 1 linearly into the threaded hole 44 of the female threaded member 2, the head 12 of the male threaded member 1 abuts against the female threaded member 2, preventing it from advancing any further. However, from this position, the threads 23 and 43 can be screwed together. This eliminates the need for the operator to judge how far to insert the part when initially inserting it linearly, compared to when the head 12 is absent. In other words, positioning the starting point for the second state becomes easier.

[0060] Furthermore, in the male screw-side member 1 according to the first embodiment of the present invention, the front surface 33 of the screw thread 23 on the male screw side in the axial direction has a chamfered shape on the radially outer side. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not chamfered, the threads 23 and 43 may catch on each other, making axial insertion difficult. By chamfering the shape, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0061] Furthermore, in the male screw-side member 1 according to the first embodiment of the present invention, the inclination angle of the screw threads 23 on the male screw side with respect to the virtual plane S1 is 1.5° or more and 3.0° or less. If the above inclination angle is greater than 3.0°, it becomes difficult to fasten the male thread 23 to the female thread 43. On the other hand, if the above inclination angle is less than 1.5°, the above gap becomes too short, making it difficult to use, such as by inserting a snap ring 61. If the above inclination angle is between 1.5° and 3.0°, fastening is easy and sufficient gap can be secured, further improving convenience.

[0062] Furthermore, the female thread side member 2 according to the first embodiment of the present invention is arranged in a part of the inner circumferential direction of the screw hole 44 and comprises a female thread surface 41 on which the female thread side threads 43 are formed, and inner circumferential pieces 42 which are arranged alternately with the female thread surface 41 in the inner circumferential direction of the screw hole 44 to form the inner circumference of the screw hole 44 and on which the female thread side threads 43 are not formed. The female thread side threads 43 extend such that the screwing direction with the male thread side threads 23 is inclined forward in the axial direction from a virtual plane S2 that is perpendicular to the axial direction of the screw hole 44, and the projected shape viewed from the radially inside of the screw hole 44 is formed to become thinner from the rear end to the front end in the screwing direction. In conventional female threaded members, the threads in the threaded hole are continuous in a spiral pattern, whereas in the first embodiment, the threaded hole 44 has an inner circumferential piece 42, resulting in shorter threads 43 (when the axial length is the same as that of a conventional threaded hole). Therefore, the time required for fastening in the female threaded member 2 according to the first embodiment can be reduced compared to conventional methods. In other words, in the first embodiment, when fastening the male threaded member 1 to the female threaded member 2, first, the threaded portion 11 of the male threaded member 1 is inserted linearly into the threaded hole 44 of the female threaded member 2. From this state, the threads 23 and 43 can be screwed together (fastened). This reduces the time required for screwing. Furthermore, when performing this screwing, the fact that the tip end of the female threaded portion 43 is thinner and the rear end is thicker in the screwing direction makes screwing easier (making it easier to insert the male threaded portion 23 into the female threaded portion 43). Furthermore, due to the inclination in the threading direction described above, the male threaded member 1 returns to the rearward side in the axial direction during threading. This creates a gap (axial gap) between the male threaded member 1 (head 12) and the female threaded member 2, allowing a snap ring 61 or the like to be inserted into this gap, thus improving convenience.

[0063] Furthermore, in the female screw side member 2 according to the first embodiment of the present invention, the front surface 53 of the female screw thread 43 in the axial direction has a chamfered shape on the radially inward side. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not chamfered, the threads 23 and 43 may catch on each other, making axial insertion difficult. By chamfering the shape, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0064] Furthermore, the fastener according to the first embodiment of the present invention comprises a male thread surface 21 arranged in a part of the outer circumference of the threaded portion 11, on which the male threaded portion 23 is formed, and outer peripheral pieces 22 arranged alternately with the male thread surface 21 in the outer circumference of the threaded portion 11 to form the outer circumference of the threaded portion 11, on which the male threaded portion 23 is not formed. The male threaded portion 23 extends such that the screwing direction with the female threaded portion 43 is inclined toward the rear in the axial direction from a virtual plane S1 that is perpendicular to the axial direction of the threaded portion 11, and the projected shape of the threaded portion 11 as viewed from the radially outside is formed to become thinner from the rear end 32 toward the tip 31 in the screwing direction. The female screw side member 2 comprises a male screw side member 1, a female screw surface 41 arranged in a part of the inner circumferential direction of the screw hole 44 and on which the female screw side threads 43 are formed, and an inner circumferential piece 42 arranged alternately with the female screw surface 41 in the inner circumferential direction of the screw hole 44 to form the inner circumference of the screw hole 44 and on which the female screw side threads 43 are not formed, wherein the female screw side threads 43 extend such that the screwing direction with the male screw side threads 23 is inclined forward in the axial direction from a virtual plane S2 that is perpendicular to the axial direction of the screw hole 44, and the projected shape viewed from the radially inside of the screw hole 44 is formed to become thinner from the rear end to the front end in the screwing direction. In conventional male screw-side members, the threads are continuous in a spiral shape, whereas in the first embodiment, the threaded portion 11 is provided with an outer peripheral piece 22, resulting in shorter threads 23 (when the axial length is the same as that of a conventional threaded portion). Therefore, the male screw-side member 1 according to the first embodiment can shorten the time required for fastening compared to conventional methods. In other words, in the first embodiment, when fastening the male threaded member 1 to the female threaded member 2, first, the threaded portion 11 of the male threaded member 1 is inserted linearly into the threaded hole 44 of the female threaded member 2. From that state, the male threaded member 1 is rotated relative to the female threaded member 2, thereby screwing (fastening) the threads 23 and 43 together. This reduces the time required for screwing. Furthermore, when performing this screwing, the male thread 23 has a thinner tip 31 and a thicker rear end 32 in the screwing direction, and the female thread 43 has a thinner tip and a thicker rear end in the screwing direction, which makes screwing easier (making it easier to insert the male thread 23 into the female thread 43). Furthermore, due to the inclination in the threading direction described above, the male threaded member 1 returns to the rearward side in the axial direction during threading. This creates a gap (axial gap) between the male threaded member 1 (head 12) and the female threaded member 2, allowing a snap ring 61 or the like to be inserted into this gap, thus improving convenience.

[0065] Furthermore, in the fastener according to the first embodiment of the present invention, the outer peripheral piece 22 is longer than the male thread surface 21 in the circumferential direction, and the inner peripheral piece 42 is longer than the female thread surface 41 in the circumferential direction. As already explained, when inserting the threaded portion 11 into the threaded hole 44, it is first inserted at an angle such that the male threaded surface 21 and the inner circumferential piece 42, and the outer circumferential piece 22 and the female threaded surface 41 face each other. Therefore, by making the outer circumferential piece 22 longer than the male threaded surface 21 in the circumferential direction, and the inner circumferential piece 42 longer than the female threaded surface 41 in the circumferential direction, even if the insertion angle is slightly off, the threads 23 of the male threaded surface 21 and the threads 43 of the female threaded surface 41 will not come into contact, allowing for smooth insertion.

[0066] ===Second Embodiment=== A second embodiment of the present invention will be described below. In the following, we will focus on explaining the differences from the first embodiment, and redundant explanations will be omitted as appropriate.

[0067] <<Configuration of the male screw-side member 1>> Figure 11 is a diagram corresponding to Figure 2, showing a male screw-side member 1 according to a second embodiment of the present invention.

[0068] As shown in Figure 11, in the second embodiment of the present invention, a through hole 71 is formed that penetrates the threaded portion 11 and the head 12 of the male screw-side member 1 in the axial direction. As a result, in the second and third states described in the first embodiment, the through hole 71 communicates with the threaded hole 44.

[0069] ===Third Embodiment=== A third embodiment of the present invention will be described below. In the following, we will focus on explaining the differences from the first or second embodiment, and will omit redundant explanations as appropriate.

[0070] ≪Thread structure≫ Figure 12 is an enlarged view showing the threads 111 on the male screw side according to the third embodiment of the present invention.

[0071] In the first embodiment, as shown in Figure 3, for example, the tip 31 and rear end 32 of the thread 23 on the male screw side had an angular shape. In contrast, in the third embodiment, as shown in Figure 12, the projected shape of the tip 112 corresponding to the tip 31 and the rear end 113 corresponding to the rear end 32, when viewed from the radially outer side, has chamfered edges at both ends.

[0072] However, the statement that "the projected shape of the tip 112 corresponding to the tip 31 and the rear end 113 corresponding to the rear end 32, as viewed from the radially outer side, is a shape in which both ends are chamfered" means that "the tip 112 and the rear end 113 are chamfered at both ends in the direction perpendicular to the screwing direction and the radial direction of the threaded portion 11, respectively."

[0073] Furthermore, although not shown in the diagram, the projection shape of the tip and rear end, as viewed from the radially outer direction, shall also be chamfered at both ends, in the case of the female thread. Note that "the projection shape of the tip and rear end, as viewed from the radially outer direction, shall be chamfered at both ends" means that the tip and rear end are chamfered at both ends in the direction perpendicular to the threading direction and the radial direction of the screw hole 44.

[0074] <Effects> In the male screw-side member 1 according to the third embodiment of the present invention, the projected shape of the rear end 113 as viewed from the radially outer side is a shape in which both ends are chamfered. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not chamfered, the threads 23 and 43 may catch on each other, making axial insertion difficult. By chamfering the shape, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0075] Furthermore, in the third embodiment of the present invention, the male screw-side member 1 has a projected shape when viewed from the radially outer side of the tip 112, with both ends chamfered. When screwing the male thread 23 into the female thread 43, if the relative positions are misaligned, and the threads are not chamfered, the male thread 23 may catch on the female thread 43, making screwing difficult. By chamfering the shape, the relative positions of the two parts will naturally adjust smoothly when they come into contact, making screwing easier.

[0076] Furthermore, in the third embodiment of the present invention, the female screw-side member 2 has a projected shape, when viewed from the radially inward side of the rear end of the female screw thread, that has chamfered edges at both ends. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not chamfered, the threads 23 and 43 may catch on each other, making axial insertion difficult. By chamfering the shape, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0077] Furthermore, in the third embodiment of the present invention, the female screw-side member 2 has a projected shape, when viewed from the radially inward side of the tip of the female screw thread, with both ends chamfered. When screwing the male thread 23 into the female thread 43, if the relative positions are misaligned, and the threads are not chamfered, the male thread 23 may catch on the female thread 43, making screwing difficult. By chamfering the shape, the relative positions of the two parts will naturally adjust smoothly when they come into contact, making screwing easier.

[0078] ===Fourth Embodiment=== A fourth embodiment of the present invention will be described below. In the following, we will focus on explaining the parts that differ from at least one of the first to third embodiments, and will omit redundant explanations as appropriate.

[0079] ≪Thread structure≫ Figure 13 is an enlarged view showing the threads 81 on the male screw side according to the fourth embodiment of the present invention. Figure 14 is an enlarged view corresponding to Figure 4, showing the threads 81 on the male screw side according to the fourth embodiment of the present invention.

[0080] As shown in Figure 13, in the fourth embodiment, the projected shape of the thread 81 on the male screw side, when viewed from the radially outer direction, is arc-shaped at the tip 82 corresponding to the tip 31 of the first embodiment and at the rear end 83 corresponding to the rear end 32 of the first embodiment.

[0081] However, the statement that "the projected shape of the tip 82 corresponding to the tip 31 of the first embodiment, and the rear end 83 corresponding to the rear end 32 of the first embodiment, as viewed from the radially outer side, is arc-shaped" means that the tip 82 and the rear end 83 are arc-shaped with respect to the direction perpendicular to the screwing direction and the radial direction of the threaded portion 11, respectively. It is preferable that the radius of curvature of this arc shape be between 0.5 and 2.0.

[0082] Furthermore, as shown in Figure 14, the surface 84 formed from the radial outer end 85 to the axial front end 86 of the thread 81 on the male screw side is curved.

[0083] Furthermore, although not shown in the diagram, the projection shape of the tip and rear end, as viewed from the radially outer direction, is also assumed to be arc-shaped, similarly for the female thread. Note that "the projection shape of the tip and rear end, as viewed from the radially outer direction, is arc-shaped" means that the tip and rear end are arc-shaped with respect to the direction perpendicular to the threading direction and the radial direction of the threaded portion 11.

[0084] <Effects> In the male screw-side member 1 according to the fourth embodiment of the present invention, the projected shape of the rear end 32 as viewed from the radially outer side is arc-shaped. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not arc-shaped, the threads 23 and 43 may get caught on each other, making axial insertion difficult. By making it arc-shaped, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0085] Furthermore, in the fourth embodiment of the present invention, the male screw-side member 1 has an arc-shaped radius of curvature of 0.5 or more and 2.0 or less. This allows the above relative angles to be adjusted more smoothly compared to other values.

[0086] Furthermore, in the fourth embodiment of the present invention, the projected shape of the female screw-side member 2, when viewed from the radially inward side of the rear end of the female screw thread, is arc-shaped. When inserting the threaded portion 11 into the threaded hole 44, if the relative angle between the male threaded member 1 and the female threaded member 2 deviates slightly from the appropriate angle, the threads 23 on the male threaded side will come into contact with the threads 43 on the female threaded side. In this case, if the rear end is not arc-shaped, the threads 23 and 43 may get caught on each other, making axial insertion difficult. By making it arc-shaped, the relative position will naturally adjust smoothly when contact is made, making insertion easier.

[0087] ===Fifth Embodiment=== A fifth embodiment of the present invention will be described below. In the following description, we will focus on the parts that differ from at least one of the first to fourth embodiments, and redundant explanations will be omitted as appropriate.

[0088] ≪Thread structure≫ Figure 15 is an enlarged view showing the threads 101 on the male screw side according to the fifth embodiment of the present invention.

[0089] As shown in Figure 15, the projected shape of the thread 101 on the male screw side according to the fifth embodiment, as viewed from the radially outer side, is triangular in shape, becoming narrower from the rear end 32 to the tip 31 in the screwing direction.

[0090] ===Literal translation=== It should be noted that the present invention is not limited to the embodiments described above. That is, any design modifications made to the above-described examples by those skilled in the art are also included within the scope of the present invention, as long as they retain the features of the present invention. Furthermore, the elements of the above embodiments and the following modifications can be combined to the extent that it is technically possible, and any combination thereof is also included within the scope of the present invention, as long as it retains the features of the present invention.

[0091] For example, in each embodiment, there are three male threaded surfaces 21, three outer circumferential pieces 22, three female threaded surfaces 41, and three inner circumferential pieces 42, but there may be four of each, or any other number. However, it is preferable that there be the same number of male threaded surfaces 21, three outer circumferential pieces 22, four female threaded surfaces 41, and four inner circumferential pieces 42.

[0092] The relative rotation angle between the threaded portion 11 and the threaded hole 44 required to screw the male threaded surface 21 and the female threaded surface 41 varies depending on the number of male threaded surfaces 21 and female threaded surfaces 41. For example, if the circumferential lengths of the male threaded surface 21, the outer peripheral piece 22, the female threaded surface 41, and the inner peripheral piece 42 are the same, then if there is one of each, the relative angle of rotation will be 180°. Alternatively, if there are two male threaded surfaces 21, two outer peripheral pieces 22, two female threaded surfaces 41, and two inner peripheral pieces 42, the relative angle of rotation will be 90°. Alternatively, if there are three male threaded surfaces 21, three outer peripheral pieces 22, three female threaded surfaces 41, and three inner peripheral pieces 42, the relative angle of rotation will be 60°. Alternatively, if there are four male threaded surfaces 21, four outer peripheral pieces 22, four female threaded surfaces 41, and four inner peripheral pieces 42, the relative rotation angle will be 45°. In other words, the more faces there are, the smaller the relative rotation angle between the threaded portion 11 and the threaded hole 44 becomes, thus reducing the time required for fastening.

[0093] Furthermore, regardless of the number of faces, it is preferable that the outer peripheral piece 22 is longer than the male threaded surface 21 in the circumferential direction, and the inner peripheral piece 42 is longer than the female threaded surface 41 in the circumferential direction. When formed in this way, the angle of relative rotation will naturally change.

[0094] Alternatively, the outer peripheral piece 22 may be shorter than the male thread surface 21 in the circumferential direction, and the inner peripheral piece 42 may be shorter than the female thread surface 41 in the circumferential direction. This improves the fastening force between the threaded portion 11 and the threaded hole 44.

[0095] Furthermore, a predetermined range of the threaded portion 11 on the rear side (head side 12) in the axial direction may be defined as a cylindrical portion. The cylindrical portion is a flat, cylindrical member on which no threads 23 are formed on the outer circumference.

[0096] Alternatively, the axial length of the threaded portion 11 may be equal to the axial length of the threaded hole 44, the head 12 may be omitted in the male threaded member 1, and a wall surface may be formed at the axial rear end of the female threaded member 2. In the first embodiment, it was explained that "the front end surface 51 (the axially forward end surface of the threaded portion 11) of the head 12 of the male threaded member 1 abuts against the front end surface 52 (the axially forward end surface of the threaded hole 44) of the female threaded member 2. As a result, the male threaded member 1 cannot advance any further. This is referred to as the first state." By forming the wall surface as described above, the axially forward end of the threaded portion 11 abuts against the wall surface, preventing the male threaded member 1 from advancing any further, and positioning at the start point toward the second state becomes easier, just as in the first state described in the first embodiment.

[0097] Furthermore, the fastener according to the present invention can be used for objects with diameters ranging from several centimeters to tens of meters. Various materials can also be used, including metal, PVC, glass, and others. Therefore, for example, the male threaded member 1 can be applied to the mouth of a PET bottle, and the female threaded member 2 to the cap. Alternatively, it can be applied to the openings of two pipes that are screwed together, or to bottle stoppers. [Explanation of symbols]

[0098] 1: Male thread side member, 2: Female thread side member, 11: Threaded portion, 12: Head, 21: Male threaded surface, 22: Outer circumference piece, 23, 81, 111: Male thread side threads, 31, 82, 102, 112: Tip, 32, 83, 103, 113: Rear end, 33, 53, 84: Surface, 41: Female threaded surface, 42: Inner circumference piece, 43, 101: Female thread side threads, 44: Threaded hole, 51: Front end surface, 52: Front end surface, 61: Snap ring, 71: Through hole, 85: Outer end, 86: Front end, S1, S2: Virtual plane

Claims

1. A male thread surface is located on a portion of the outer circumference of the threaded portion, and the threads on the male thread side are formed therein. The outer circumference of the screw portion is formed by alternating arrangements of the male thread surface and the outer peripheral piece on the male thread side, and the outer peripheral piece on the male thread side does not have threads formed therein. A large-diameter portion is connected to the aforementioned threaded portion from the rear side in the axial direction of the threaded portion, and has a larger outer diameter than the aforementioned threaded portion. Equipped with, The threads on the male screw side extend so as to be inclined toward the rear in the axial direction, relative to a virtual plane perpendicular to the axial direction, in which the threads with the threads on the female screw side formed on the female screw side member are threaded, and the projected shape of the threaded portion as viewed from the radially outer side is formed to become thinner from the rear end toward the tip in the threading direction. The threads on the male screw side are formed in such a position and inclination that, starting from a state where the large diameter portion abuts the female screw side member, the male screw side member rotates relative to the female screw side member, causing the male screw side member to move backward in the axial direction while screwing into the threads on the female screw side, thereby forming a gap between the large diameter portion and the female screw side member into which a notch is formed and a deformable ring-shaped member can be fitted. Male screw side component.

2. The front surface of the thread on the male screw side in the axial direction has a chamfered shape on its radially outer side. The male screw-side member according to claim 1.

3. The projected shape of the aforementioned rear end, as viewed from the radially outer side, is a shape in which both ends are chamfered. The male screw-side member according to claim 1.

4. The projected shape of the aforementioned tip, as viewed from the radially outer side, is a shape in which both ends are chamfered. The male screw-side member according to claim 1.

5. The projected shape of the rear end, as viewed from the radially outer side, is arc-shaped. The male screw-side member according to claim 1.

6. The radius of curvature of the aforementioned arc is 0.5 or more and 2.0 or less. The male screw-side member according to claim 5.

7. The inclination angle of the threads on the male screw side with respect to the virtual plane is 1.5° or more and 3.0° or less. The male screw-side member according to claim 1.

8. A female thread surface is located in a portion of the inner circumference of the screw hole, and the threads on the female thread side are formed therein. The inner circumference of the screw hole is formed by alternating arrangements of the female thread surface and the inner circumferential surface in the inner circumferential direction of the screw hole, and the inner circumferential piece on the female thread side does not have threads formed thereon, Equipped with, The female threads extend such that the threading direction with the male threads formed on the male thread member is inclined forward in the axial direction of the screw hole, relative to a virtual plane perpendicular to the axial direction of the screw hole, and the projected shape viewed from the radially inside of the screw hole is formed to become thinner from the rear end to the front end in the threading direction. The female threads are formed in such a position and inclination that a notch is formed between the large-diameter portion of the male thread member and the female thread member, which is connected to the threaded portion on the male thread side from the rear side in the axial direction of the threaded portion and has a larger outer diameter than the threaded portion, is in contact with the female thread member, and as the male thread member rotates relative to the female thread member, it screws into the male threads and moves the male thread member toward the rear side in the axial direction of the threaded portion, forming a gap between the large-diameter portion and the female thread member into which a deformable ring-shaped member can be fitted. Female thread side component.

9. The front surface of the threaded hole in the female thread, in the axial direction, has a chamfered shape on its radially inward side. The female threaded side member according to claim 8.

10. The projected shape of the aforementioned rear end, as viewed from the radially inward side, is a shape in which both ends are chamfered. The female threaded side member according to claim 8.

11. The projected shape of the aforementioned tip, as viewed from the radially inward side, is a shape in which both ends are chamfered. The female threaded side member according to claim 8.

12. The projected shape of the rear end, as viewed from the radially inward side, is arc-shaped. The female threaded side member according to claim 8.

13. A male thread surface is arranged in a part of the outer circumference of the threaded portion and on which the male threads are formed; an outer peripheral piece is arranged alternately with the male thread surface in the outer circumference of the threaded portion to form the outer circumference of the threaded portion and on which the male threads are not formed; and a large diameter portion is connected to the threaded portion from the rear side in the axial direction of the threaded portion and has an outer diameter larger than that of the threaded portion, wherein the male threads extend such that the screwing direction with the female threads formed on the female thread member is inclined toward the rear in the axial direction from a virtual plane that is perpendicular to the axial direction. Furthermore, the projected shape of the threaded portion, as viewed from the radially outer side, is formed to become thinner from the rear end to the tip in the threading direction, and the threads on the male thread side are formed in such a position and inclination that, starting from a state where the large diameter portion abuts the female thread side member, the male thread side member rotates relative to the female thread side member, causing the male thread side member to move towards the rear in the axial direction while screwing into the threads on the female thread side, and a gap is formed between the large diameter portion and the female thread side member for fitting a notch-shaped, deformable ring-shaped member, The ring-shaped member that is fitted into the gap, A fastener equipped with the following features.

14. A female thread surface is arranged in a portion of the inner circumference of a screw hole and on which the female threads are formed, and inner circumferential pieces are arranged alternately with the female thread surface in the inner circumference of the screw hole to form the inner circumference of the screw hole and on which the female threads are not formed, wherein the female threads extend such that the screwing direction with the male threads formed on the male thread member is inclined forward in the axial direction of the screw hole than a virtual plane perpendicular to the axial direction of the screw hole, and the projected shape viewed from the radially inside of the screw hole is formed to become thinner from the rear end to the front in the screwing direction. The female thread is formed such that the female thread is connected to the threaded portion on the male thread from the rear side in the axial direction of the threaded portion, and the larger diameter portion, which is larger in outer diameter than the threaded portion, is in contact with the female thread, and as the male thread is rotated relative to the female thread, it screws into the male thread and moves toward the rear side in the axial direction of the thread, forming a gap between the large diameter portion and the female thread, into which a notch is formed and a deformable ring-shaped member can be fitted, and the female thread is formed in such a position and inclination. The ring-shaped member that is fitted into the gap, A fastener equipped with the following features.

15. The device comprises a male thread surface located on a portion of the outer circumference of the threaded portion, on which the male threads are formed; outer peripheral pieces arranged alternately with the male thread surface in the outer circumference of the threaded portion to form the outer circumference of the threaded portion, on which the male threads are not formed; and a large-diameter portion connected to the threaded portion from the rear in the axial direction, with a larger outer diameter than the threaded portion, wherein the male threads extend such that the screwing direction with the female threads formed on the female threaded member is inclined towards the rear in the axial direction from a virtual plane perpendicular to the axial direction. The male threaded member is formed such that the projected shape of the threaded portion, viewed from the radially outer side, tapers from the rear end to the tip in the threading direction, and the male threaded portion is formed such that, starting from a state where the large diameter portion abuts the female threaded member, the male threaded member rotates relative to the female threaded member, causing it to screw into the female threaded portion while moving the male threaded member to the rear in the axial direction, and a gap is formed between the large diameter portion and the female threaded member, into which a notch is formed and a deformable ring-shaped member can be fitted, and the male threaded member is formed in such a position and inclination. The female threaded member comprises a female threaded surface located in a portion of the inner circumference of the screw hole, on which the female threads are formed, and inner circumferential pieces arranged alternately with the female threaded surface in the inner circumference of the screw hole, forming the inner circumference of the screw hole, on which the female threads are not formed, wherein the female threads extend such that the screwing direction with the male threads formed on the male threaded member is inclined forward in the axial direction of the screw hole than a virtual plane perpendicular to the axial direction of the screw hole, and the projected shape viewed from the radially inside of the screw hole is formed to become thinner from the rear end to the tip in the screwing direction, and the female threads are formed in such a position and inclination that, from a state in which the large diameter portion abuts the female threaded member, the male threaded member rotates relative to the female threaded member, thereby screwing into the male threads and moving the male threaded member backward in the axial direction of the screw portion, thereby forming the gap between the large diameter portion and the female threaded member, A fastener equipped with the following features.

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