JP3763819B2 - Combination loosening prevention structure of female screw part and male screw part, and male screw part structure therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combined loosening prevention structure of an internal thread part and an external thread part for preventing loosening of nuts and bolts, and an external thread part structure therefor.
[0002]
[Prior art]
2. Description of the Related Art Nuts and bolts that have been known to prevent loosening when combined with bolts and nuts have been known. For example, Patent Document 1 has a thread in a female threaded portion of a nut provided with irregularities that are continuously repeated in the circumferential direction, and the female thread portion has a reduced diameter, and Patent Document 2 has a threaded male threaded portion. The thing which formed the unevenness | corrugation in the inclined part to perform is disclosed.
[0003]
[Patent Document 1]
JP 11-37129 A [Patent Document 2]
Japanese Patent Laid-Open No. 2001-227524
[Problems to be solved by the invention]
However, loosening (sliding) occurs due to external forces such as vibration during long-term use, and a sufficient locking prevention effect cannot be obtained.
[0005]
Accordingly, an object of the present invention is to provide a combined loosening prevention structure of a female screw part and a male screw part that achieves a further locking effect by combining a female screw part structure such as a nut and a male screw part structure such as a bolt, and a male screw part structure therefor. There is to do.
[0006]
[Means for Solving the Problems and Effects of the Invention]
The combination locking structure of the female screw portion and the male screw part according to the present invention, the outlet end of the inlet end of the screwing of the female screw member and the outlet end for the externally threaded member, wherein the internal thread inner diameter intermediate forms a reduced径雌threaded portion of the conical section reduced in diameter in a tapered shape becomes smaller as the entire circumference than the parts,
In the thread of the reduced diameter female thread portion, a female thread side recess is formed that is continuously recessed from this thread in the direction of the valley bottom of the reduced diameter thread portion, and in the circumferential direction of the thread of the reduced diameter female thread portion. Consists of a female thread side unevenness that continues continuously ,
Project group of their female thread side projections on the center side of the female screw part, the group of those of the internal thread side recess to forming a mode of retreat from the center side of the female screw portion,
At the bottom of the male threaded portion of the male threaded member that is screwed with the reduced-diameter threaded part of the female threaded member , a recess that is continuously recessed from the bottom of the male threaded part toward the center of the male threaded part is formed. Configure the male screw side irregularities that repeat continuously in the circumferential direction the valley bottom of the male screw part of the male screw member to be combined,
These male fitting protrusion group projects radially outward from the center of the external thread portion of a group of their male fitting recess to forming a mode of retreat toward the center of the externally threaded portion,
In a state where the female screw portion is screwed to the male screw portion, at least one of the plurality of concave and convex female screw side convex portions in the thread of the reduced diameter female screw portion is a plurality of concave and convex portions in the valley bottom of the male screw portion of the male screw member. Fitting with at least one of the male thread side recesses of
The group of convex portions of the reduced-diameter female screw portion bites into and tightens the valley bottom or the screw thread side surface of the male screw portion of the male screw member, and the female screw portion is fitted by one or a plurality of fittings of the female screw side convex portion and the male screw side concave portion. It is characterized by restraining the rotation of the screw and the male screw part.
[0007]
According to this invention, since the internal diameter of the internal thread on which the internal thread side irregularities are formed is reduced in a taper shape over the entire circumference so as to be smaller than the intermediate part, it is deformed by applying a pressing force to a part of the entire periphery. Variations in the deformation of the female thread portion as in the case are unlikely to occur. Furthermore, according to the combination of the female screw member and the male screw member according to the present invention, the female screw side unevenness formed on the screw thread of the female screw portion and the male screw side unevenness formed on the valley bottom of the male screw of the male screw portion are provided at one or a plurality of locations. The female screw part and the male screw part are locked by fitting at the places.
[0008]
Furthermore, as a specific form of the present invention, the male screw side unevenness of the valley bottom of the male screw portion and the female screw side unevenness of the screw thread of the female screw portion can have the same uneven shape corresponding to each other so as to be fitted to each other. . Further, the number can be made the same by corresponding.
[0009]
In this way, the male screw side irregularities on the bottom of the male screw part and the female screw side irregularities on the female thread part are individually fitted (engaged) with each other, so that the female screw member and the male screw member are locked. The effect of locking is obtained.
[0010]
Further, here, when the convex part on the female thread side of the thread of the reduced diameter female thread part exerts a pressing force between the bottom of the male screw member or the side surface of the thread, the convex part on the female thread side of the thread is elastically elastic. Since the compressed meat part has recesses on both sides, it is easy to escape on both sides, which suppresses a sharp increase in torque during screwing. Similarly, the male thread side convex part of the valley bottom of the male screw member receives a pressing force between the thread of the female screw member or the valley side surface of the female screw, and the meat part in which the male thread side convex part of the valley bottom is elastically compressed is on both sides. After the completion of screwing, the female screw side convex portion is brought into pressure contact with the elastically compressed meat portion, thereby achieving a good locking function.
[0011]
As another specific form of the present invention, the number of the male screw side irregularities at the bottom of the male screw part may be an integral multiple of the number of the female screw side irregularities of the thread of the female screw part.
[0012]
If it does in this way, unlike the case where the number of the unevenness | corrugations mentioned above is the same, for example, two external thread side convex parts will fit in with respect to one internal thread side recessed part. If it is set to an integral multiple, the male screw side convex part will always fit in the female screw side concave part, and the number of irregularities on the male screw part side will be greater than the number of irregularities on the female screw part side. Fitting with the female thread side recess is facilitated.
[0013]
Furthermore, the number of the male screw side irregularities of the valley bottom of the male screw part may be larger than the number of female screw side irregularities of the screw thread of the female screw part and may not be an integral multiple.
[0014]
In this way, the fitting part is one place, but the male screw side concave part (or the female screw side convex part) rotates a little when tightening, so that any female screw side convex part (or male screw side concave part) It can fit in one place. In other words, by setting the number of male screw side irregularities and the number of female screw side irregularities to different numbers, each irregularity fits in any one place, and in the unfit part, for example, the female screw side convex part and the male screw side The convex portion or the thread side surface of the male screw is pressed against each other and pressed against each other.
[0015]
In addition, the specific shape of the male screw side irregularities at the bottom of the male screw part is, for example, an undulating shape in a circular arc shape, or a mountain (triangle etc.) in which the male screw side convex part is wide from the tip side to the base side in plan view The shape or trapezoidal shape, the male screw-side concave portion may be an inverted triangular shape or an inverted trapezoidal shape opposite thereto. In any shape, since the cross-sectional area of the distal end portion of the male screw side convex portion is smaller than the cross-sectional area on the base end side, it is easily elastically deformed, and therefore the torque during tightening can be reduced. In addition, this shape can be similarly applied to the female screw side unevenness, and if the unevenness shape is made to correspond to the female screw member and the male screw member as necessary, a more appropriate pressure contact state can be obtained and the effect of preventing loosening can be obtained. .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.
[0017]
FIG. 1 is a front view showing a locking nut and a locking bolt according to an embodiment of the present invention. 1 shown in the figure is a locking nut main body (hereinafter also simply referred to as a nut), and in plan view, the inlet side end portion 2 to the intermediate portion 5 which is the inlet side of the bolt to be screwed is hexagonal, The exit side end portion 3 has a truncated truncated cone shape, which is a tapered outer peripheral surface 9.
[0018]
In the center of the nut 1, a female screw portion 4 is provided so as to penetrate from the inlet side end portion 2 to the outlet side end portion 3. The female screw portion 4 includes a main female screw portion 6 having the same inner diameter from the inlet side end portion 2 to the intermediate portion 5, and a reduced diameter female screw whose inner diameter is reduced from the main female screw portion 6 to the outlet side end portion 3. Part 7. The reduced-diameter female screw portion 7 has a conical cross-sectional shape that is reduced in a taper shape over the entire circumference so that the inner diameter of the female screw is smaller than the inner diameter of the main female screw portion 6.
[0019]
Further, as shown in FIG. 2, wave-like irregularities 20 that are continuously repeated in the circumferential direction are formed on the thread 8 of the internal thread in the reduced diameter internal thread portion 7. Concavities and convexities 20 are formed in the thread of a little less than 3 threads of the reduced diameter female thread portion 7, and are formed continuously over these threads, and the arrangement of the irregularities between adjacent threads forms a thread. It forms in the position corresponding to each other so that it may align on the crossing straight line. Further, the female screw side convex portion 22 of the concave and convex portion 20 is formed, for example, at twelve locations in one circumference of the reduced diameter female screw portion 7.
[0020]
Further, FIG. 5 is a diagram for explaining the diameter of the concavo-convex portion 20 portion of the reduced diameter female screw portion 7 and the pitch S of the concavo-convex portion 20. The female screw side convex portion 22 of the concavo-convex 20 is formed so as to protrude toward the center of the reduced diameter female screw portion 7 as shown in the figure, and the tip of the female screw side convex portion 22 is at the tip of the thread of the reduced diameter female screw portion 7. The base end side of the female screw side recess 24 substantially coincides with the valley bottom of the reduced diameter female screw portion 7. The reduced-diameter female screw portion 7 on which the unevenness 20 is formed is smaller than the inner diameter of the main female screw portion 6 as described above, so that the inscribed circle 26 that connects the tip of the female screw-side convex portion 22 that repeats continuously in the circumferential direction. The diameter d1 is made smaller than the valley diameter of the bolt to be screwed. In addition, the diameter d2 of the inscribed circle connecting the base end side of the female thread side recess 22 is larger than or equal to the valley diameter of the bolt.
[0021]
Returning to FIG. 1, reference numeral 10 denotes a locking bolt main body, which includes a head 15 at the tip, and a male screw portion 11 is formed on the entire side of the bolt main body 10 excluding the head 15. An uneven portion that is continuous in the circumferential direction of the male screw portion 11 is formed on the valley bottom 13 of the male screw portion 11 in the same manner as the nut 1 described above. FIG. 3 shows a plan view of the bolt 10. Reference numeral 36 denotes a shaft portion, and wave-shaped irregularities 34 are formed in the circumferential direction of the male screw portion. The male screw side irregularities 34 here correspond to the female screw side irregularities 20 in the nut 1 so as to fit with each other, and are formed in the same shape and the same number. That is, for example, twelve male screw-side convex portions 32 are formed on one circumference of the screw so as to protrude outward in the radial direction. On the contrary, the male screw side concave portion 34 is formed as a concave portion so as to protrude toward the center side of the shaft.
[0022]
Further, if the number of the female screw side irregularities 20 formed on the nut 1 to be screwed is the same, the number of the corrugated male screw side irregularities 30 can be formed in the same number of thread portions of less than three threads to be screwed. If the same number is formed, the male screw side convex portion 32 and the male screw side concave portion 34 are fitted into the female screw side concave portion 24 and the female screw side convex portion 22, respectively, to produce a locking effect of bolts and nuts.
[0023]
Next, an operation when the locking nut 1 having such a structure and the locking bolt 10 are screwed together will be described. FIG. 4 is a diagram for explaining the operation. As shown in (a), when the bolt 10 is screwed into the female screw portion 4 of the inlet side end portion 2 of the locking nut 1 (the same applies to the case where the bolt 10 is screwed to the nut 1), the bolt In the latter half of the screwing of the nut 10 and the vicinity of the end of the nut 1, the tip of the bolt 10 reaches the reduced diameter female screw portion 7 of the nut 1 as shown in FIG.
[0024]
Thereafter, since the diameter d1 of the inscribed circle of the female screw side convex portion 22 formed in the reduced diameter female screw portion 7 is smaller than the valley diameter of the bolt 10, the female screw side convex portion 22 is screwed into the male screw portion 11 (screwed together). The threaded surface of the male threaded part), the root of the thread or the inclined surface sandwiching the threaded surface is pressed. Similarly, the male screw portion 11 with which the female screw-side convex portion 22 is pressed is elastically compressed, and the male screw portion and the female screw portion exert a pressing force on each other. Here, the first locking effect is produced, and subsequently, the male screw side unevenness 30 formed on the bolt 10 is engaged with the female screw side unevenness 20 portion formed on the nut 1 (pressed while fitting). ) These act as a second loosening prevention effect.
[0025]
Here, as shown in (c), by the end of the bolt, the male thread side recess 34 (or the male thread side convex part 32) formed in the bottom 13 of the male screw and the thread of the female screw are finally formed. 8 and the female screw side convex portion 22 (or the female screw side concave portion 24) are disengaged from each other, proceed to the fitting of the adjacent concave and convex portions, and repeat the operation. At this time, when the unevenness once fitted is disengaged and proceeds to the fitting of the next adjacent unevenness, the internal thread side convex part 22 and the external thread side convex part 32 collide with each other as the bolt 10 advances. In this manner, a slipping state that rubs in the pressure contact state occurs. In some cases, the convex portions may be scraped by the circumferential stress generated by the slip, but each of the convex portions 22 and 32 has a wide shape from the tip end to the base end side as described above. The tips of the projections are easily elastically deformed, and problems such as wear of the projections can be avoided if the pitch of the projections and depressions is set appropriately in advance. The preferred number of irregularities may differ depending on the average inner diameter d of the reduced-diameter female screw portion and the pitch of the thread of the reduced-diameter female screw portion, but cannot be generally stated. For example, as shown in FIG. When the average inner diameter d of 7 is used as a reference, it is desirable to determine the size and number of the female screw side unevenness 20 so that the pitch S of the unevenness 20 is in the range of 0.1 to 0.5d. The male screw side irregularities 30 can also be formed in the same manner.
[0026]
In this way, when the nut 1 and the bolt 10 are completely screwed as shown in FIG. 4 (c) and the plan view of the nut 1 and the bolt 10 after the screwing is completed, A good anti-loosening effect is achieved by the respective fitting of the irregularities.
[0027]
Next, another embodiment of the present invention will be described. So far, the case where the number of female screw side irregularities in the female screw portion and the number of male screw side irregularities in the male screw portion are the same has been described, but the number of irregularities is not necessarily limited to the same number. FIG. 7 is a diagram showing an embodiment in which the number of male screw side irregularities is set to twice the number of female screw side irregularities. For comparison, the nut 1 shown in FIG. 6 and the nut 1 shown in FIG. 7 are described below as having the same shape and the same dimensions. Therefore, twelve female screw-side irregularities 20 formed on the nut 1 are formed in the same shape and number as in the previous case, for example, twelve in a round shape of the thread. On the other hand, the number of the male screw side irregularities 30 of the bolt is 24, which is twice that of the female screw side irregularities 20, and the area of one convex portion of the irregularities is smaller than one area of the female screw side concave portion. The male screw side convex portion 42 is formed so as to enter.
[0028]
In this case, the two male screw side convex portions 42 are fitted into the single female screw side concave portion 24, and the male screw side convex portion 42 (or the concave portion) which does not fit is generated. However, the male screw side concave portion 44 is fitted to the tip portion of the female screw side convex portion 22 respectively, and if it moves by one pitch of the convex portion 42 when screwed with the bolt, it is fitted again at that position. be able to. Naturally, the length of one pitch is smaller than the pitch S in the above-described embodiment FIG. 5 (in other words, one pitch in the female screw side unevenness 20), so the possibility of fitting is increased. That is, since the formation interval of the male screw side irregularities 30 that can be fitted is narrow, the fitting is facilitated.
[0029]
Although the number of male screw side irregularities and the number of irregularities on the female screw side are not the same, and the number of irregularities on one side is not an integral multiple of the number of other irregularities, the same can be said although not shown. That is, in this case, each unevenness fits in one place, but if the formation interval of the male screw side unevenness is narrowed, there are many male screw side unevenness that can be fitted in the same manner as above, so to speak with bolts Any position at the time of screwing of the nut can be fitted at one place to achieve a locking effect. For example, the female screw side convex portion and the male screw side convex portion or the screw thread side surface of the male screw are pressed against each other at the portion that does not fit.
[0030]
In addition, as the reduced diameter female thread portion 7 of the nut 1 and the bolt 10 are screwed together, it is normal that the inner diameter of the reduced diameter female thread portion 7 is elastically expanded to some extent. At that time, the inner diameter taper angle of the reduced diameter female screw portion 7 may be reduced by a predetermined amount from α2 to α3 in FIG. In this state, the bolt 10 that has been screwed in enters the reduced-diameter female screw portion 7 so as to expand it, and the reduced-diameter female screw portion 7 is elastically deformed in the circumferential direction. This circumferential tensile force acts as a pressing force on the unevenness (or thread side surface) of the external thread of the bolt, thereby creating a more effective pressure contact state and exhibiting a sufficient loosening prevention effect.
[0031]
Next, a method for manufacturing the locking bolt 10 described so far will be briefly described. FIG. 8 is a view for explaining a method of manufacturing the locking bolt 10. First, as in a known technique, a round bar 51, which is a bolt material, is rolled between plate dies 50 to cut male threads. At this time, as shown in FIG. The protrusions 52 are provided, and the protrusions 52 are formed in a predetermined concavo-convex shape at the portions that become the valleys of the male threads that are carved into the round bar 51.
[0032]
Here, the plate die is provided with the triangular convex portion, but conversely, the plate die may be formed with the concave portion. In addition to the wave-like shape described so far, for example, a trapezoidal unevenness 62 as shown in FIG. 10A or a triangular unevenness 72 as shown in FIG. You can also. In any case, the locking bolt 10 can be manufactured by forming irregularities desired in a desired shape to be engraved on the thread of the male screw on the plate die over the number of the strips.
The present invention is not limited to nuts and bolts, but is widely applied to fastening members having a female screw and male screw structure.
[Brief description of the drawings]
FIG. 1 is a front view of a locking nut and bolt according to an embodiment of the present invention.
FIG. 2 is a plan view of a locking nut.
FIG. 3 is a plan view of a locking bolt.
FIG. 4 is an operation explanatory diagram when a locking nut and a locking bolt are screwed together.
FIG. 5 is a diagram showing an inner diameter of a reduced-diameter female screw portion and a pitch of unevenness.
FIG. 6 is a view for explaining the screwing of the concavo-convex portions of the locking nut and the locking bolt.
FIG. 7 is a view for explaining screwing of the concavo-convex portions of a locking nut and a locking bolt according to another embodiment.
FIG. 8 is a view for explaining a method of manufacturing a locking bolt.
FIG. 9 is an enlarged view of the plate die portion.
FIG. 10 is a diagram showing another example of the uneven shape of the locking bolt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Loosening prevention nut 2 Inlet side edge part 3 Outlet side edge part 4 Female thread part 6 Main female thread part 7 Reduced diameter female thread part 8 Female thread part thread 10 Loosening stop bolt 11 Male thread part 12 Male thread part thread 13 Valley bottom of male thread part 15 Head 20 Female thread side irregularity 22 Female screw side convex part 24 Female screw side concave part 30 Male screw side concave part 32, 42 Male screw side convex part 34, 44 Male thread side concave part 50 Plate die 51 Round bar 52 Die protrusion 53 Plate screw thread

Claims (7)

The outlet end of the inlet end of the screwing of the female screw member and the outlet end for the male screw member, over the entire circumference as there female thread internal diameter is smaller than the intermediate portion reduced in diameter in a tapered shape forms a reduced径雌threaded portion of the conical section,
In the thread of the reduced diameter female thread portion, a female thread side recess is formed that is continuously recessed from this thread in the direction of the valley bottom of the reduced diameter thread portion, and in the circumferential direction of the thread of the reduced diameter female thread portion. Consists of a female thread side unevenness that continues continuously ,
Protrudes toward the center of the group of those of the female screw-side protrusion is internally threaded portion, the group of those of the internal thread side recess in the form of backward from the center side of the female screw portion,
At the bottom of the male threaded portion of the male threaded member that is screwed with the reduced-diameter threaded part of the female threaded member , a recess that is continuously recessed from the bottom of the male threaded part toward the center of the male threaded part is formed. Configure the male screw side irregularities that repeat continuously in the circumferential direction the valley bottom of the male screw part of the male screw member to be combined,
These male fitting protrusion group projects radially outward from the center of the external thread portion of a group of their male fitting recess to forming a mode of retreat toward the center of the externally threaded portion,
In a state where the female screw portion is screwed to the male screw portion, at least one of the plurality of concave and convex female screw side convex portions in the thread of the reduced diameter female screw portion is a plurality of concave and convex portions in the valley bottom of the male screw portion of the male screw member. Fitting with at least one of the male thread side recesses of
The group of convex portions of the reduced-diameter female screw portion bites into and tightens the valley bottom or the screw thread side surface of the male screw portion of the male screw member, and the female screw portion is fitted by one or a plurality of fittings of the female screw side convex portion and the male screw side concave portion. A combined loosening prevention structure of a female screw part and a male screw part, which restricts rotation of the screw and the male screw part. 2. The female screw part according to claim 1, wherein the male screw side unevenness of the valley bottom of the male screw part and the female screw side unevenness of the screw thread of the female screw part have the same uneven shape that can be fitted to each other. A combination locking mechanism with male thread. 3. The combined loosening prevention structure of the female screw portion and the male screw portion according to claim 1, wherein the number of the male screw side unevenness of the valley bottom of the male screw portion is the same as the number of the female screw side unevenness of the screw thread of the female screw portion. 2. The combined loosening prevention structure of the female screw portion and the male screw portion according to claim 1, wherein the number of the male screw side unevenness at the bottom of the male screw portion is an integral multiple of the number of the female screw side unevenness of the screw thread of the female screw portion. 2. The combined loosening prevention structure of the female screw portion and the male screw portion according to claim 1, wherein the number of the male screw side unevenness at the bottom of the male screw portion is larger than the number of the female screw side unevenness of the screw thread of the female screw portion and is not an integral multiple. It is the structure of the external thread part in the combination locking structure of the internal thread part and male thread part of any one of Claim 1 thru | or 5, Comprising:
The male screw side unevenness of the valley bottom of the male screw part is formed in a mountain shape in which the convex part is wide from the distal end side to the proximal end side in a plan view, and has a combined loosening prevention structure of the female screw part and the male screw part. Male screw part structure for. It is the structure of the external thread part in the combination locking structure of the internal thread part and male thread part of any one of Claim 1 thru | or 5, Comprising:
The male screw portion structure for the combined loosening prevention structure of the female screw portion and the male screw portion is characterized in that the male screw side unevenness of the valley bottom of the male screw portion is formed in an undulating shape in an arc shape.

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