WO2021124636A1 - 緩み止め装置 - Google Patents
緩み止め装置 Download PDFInfo
- Publication number
- WO2021124636A1 WO2021124636A1 PCT/JP2020/036847 JP2020036847W WO2021124636A1 WO 2021124636 A1 WO2021124636 A1 WO 2021124636A1 JP 2020036847 W JP2020036847 W JP 2020036847W WO 2021124636 A1 WO2021124636 A1 WO 2021124636A1
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- WO
- WIPO (PCT)
- Prior art keywords
- peripheral surface
- screw
- outer peripheral
- convex portion
- inner peripheral
- Prior art date
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- 230000002265 prevention Effects 0.000 title claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims description 237
- 230000000694 effects Effects 0.000 abstract description 8
- 230000004323 axial length Effects 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 238000009430 construction management Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/126—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft
- F16B39/128—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft by means of eccentrical or spiral interengaging parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/126—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
- F16B39/18—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut in which the locknut grips with screw-thread in the nuts as well as on the bolt
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/005—Set screws; Locking means therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/122—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts foreseen with mating surfaces inclined, i.e. not normal, to the bolt axis
Definitions
- the present invention relates to a locking device that can be suitably implemented as a locking special double nut, a set screw, or the like.
- hard lock is a trademark of the applicant of the present application
- HLS hard lock set screw
- the hard lock nut has a first nut 110 (first screw member) having a screw hole 111 screwed into the screw shaft S and a screw hole 121 screwed into the screw shaft S. It is composed of a second nut 120 (second screw member) having the above.
- the nut 110 has a truncated cone-shaped convex portion 112 that projects axially toward the nut 120.
- the convex portion 112 has a tapered outer peripheral surface 112a having a predetermined taper angle that gradually decreases in diameter toward the tip end side.
- the screw hole 111 of the nut 110 penetrates the convex portion 112 along the axial direction.
- the nut 120 has a concave portion 122 into which the convex portion 112 fits.
- the recess 122 has a tapered inner peripheral surface 122a having a taper angle that matches the taper angle of the outer peripheral surface of the convex portion 112, preferably the same taper angle.
- the screw hole 121 of the nut 120 is open to the bottom surface of the recess 122.
- the hard lock nut eccentrically fits the convex portion 112 of the nut 110 and the concave portion 122 of the nut 120 to generate a stress state in which a wedge is driven between the screw shaft S and the nuts 110 and 120.
- the wedge action exerts a strong anti-loosening effect.
- the eccentric fitting of the convex portion 112 and the concave portion 122 is formed by eccentricizing the outer peripheral surface of the convex portion 112 of the nut 110 with respect to the screw hole 111, or the inner peripheral surface of the concave portion 122 of the nut 120 is screwed. It is realized by forming it eccentrically with respect to 121.
- the outer peripheral surface of the convex portion 112 is eccentric with respect to the screw hole 111 as shown in FIG. 7, the inner peripheral surface of the concave portion 122 and the screw hole 121 are concentric.
- the inner peripheral surface of the concave portion 122 is eccentric with respect to the screw hole 121 (not shown), the outer peripheral surface of the convex portion 112 and the screw hole 111 are concentric.
- a pressing force is applied to the nuts 110 and 120 along the eccentric direction in a state where the convex portion 112 of the nut 110 screwed to the screw shaft S and the concave portion 122 of the nut 120 are eccentrically fitted.
- the outer peripheral surface of the convex portion 112 and the inner peripheral surface of the concave portion 122 interfere with each other in a part in the circumferential direction. Further, the larger the fitting depth of the convex portion 112 with respect to the concave portion 122, the larger the pressing force along the eccentric direction.
- Patent Document 5 discloses a pivoting device to which the principle of preventing loosening of a hard locknut is applied.
- the outer circumference of the boss portion is such that the pressing force generated in the first and second nuts in the direction orthogonal to the axis is constant even if the fitting depth of the boss portion with respect to the engaging recess is changed.
- Both the surface and the inner peripheral surface of the engaging recess are formed in a straight cylinder shape.
- Patent Documents 6 and 7 disclose a set screw (trade name "hard lock set screw”, abbreviated as "HLS”) having a locking function. This HLS is an application of the uneven eccentric fitting structure of a hard locknut to a set screw.
- HLS hard lock set screw
- Japanese Unexamined Patent Publication No. 2016-125622 Japanese Unexamined Patent Publication No. 2016-133136 Japanese Unexamined Patent Publication No. 2002-195236 JP-A-61-244912 JP-A-2017-219117 Japanese Unexamined Patent Publication No. 2001-50292 Japanese Unexamined Patent Publication No. 2006-281493
- the conventional hard locknut or HLS has the convex portion 112 and the concave portion 122 in the fitted state so as to cause a strong wedge action by the eccentric fitting of the convex portion 112 and the concave portion 122. It is designed so that the tapered outer peripheral surface of the convex portion 112 and the tapered inner peripheral surface of the concave portion 122 slightly interfere with each other in a part in the circumferential direction.
- the contact state between the female screw of the screw hole 121 and the male screw of the screw shaft S becomes non-uniform depending on the axial position, and is orthogonal to the axial direction for causing a wedge action.
- the force in the direction of the wedge is evenly distributed over a wide range in the axial direction of the upper nut 120 and does not work.
- An object of the present invention is to suppress the inclination between the first and second screw members in the fastened state.
- the loosening prevention device of the present invention includes a first screw member having a screw screwed to the mounted member and a second screw member having a screw screwed to the mounted member.
- the first screw member has a convex portion that protrudes in the axial direction toward the second screw member.
- the convex portion has an outer peripheral surface including a tapered outer peripheral surface portion having a predetermined taper angle.
- the screw hole may penetrate the convex portion along the axial direction.
- the second screw member has a concave portion to which the convex portion fits.
- the recess has an inner peripheral surface including a tapered inner peripheral surface portion having a predetermined taper angle.
- the screw hole may be open to the bottom surface of the recess.
- the tapered outer peripheral surface portion of the convex portion is eccentric with respect to the screw of the first screw member, and the tapered inner peripheral surface portion of the concave portion is the second screw member. It is concentric with respect to the screw, or (2) the tapered inner peripheral surface portion of the concave portion is eccentric with respect to the screw of the second screw member, and the tapered outer peripheral surface portion of the convex portion is the first. It may be concentric with respect to the screw of the screw member of.
- the convex portion of the first screw member screwed into the attached member and the concave portion of the second screw member screwed into the attached member are eccentrically fitted.
- the tapered outer peripheral surface and the tapered inner peripheral surface interfere with each other in a part in the circumferential direction so that a pressing force along the eccentric direction is generated in the first and second screw members, and the convex portion
- the pressing force is configured to increase as the fitting depth with respect to the recess increases.
- the outer peripheral surface of the convex portion of the first screw member may further include a tip outer peripheral surface portion provided on the tip end side of the convex portion rather than the tapered outer peripheral surface portion.
- the inner peripheral surface of the recess of the second screw member may further include a bottom-side inner peripheral surface portion provided on the bottom side of the recess rather than the tapered inner peripheral surface portion.
- the bottom side of a recess means the back side in the depth direction of a recess.
- the convex portion of the first screw member screwed into the attached member and the concave portion of the second screw member screwed into the attached member are eccentrically fitted.
- the tapered outer peripheral surface portion of the convex portion interferes with the tapered inner peripheral surface portion of the concave portion in a part in the circumferential direction, but the tip outer peripheral surface portion of the convex portion and the bottom side inner peripheral surface portion of the concave portion
- the outer peripheral surface of the convex portion and the inner peripheral surface of the concave portion may be configured so that a gap is formed over the entire circumference between the two.
- the convex portion is in a state where the convex portion of the first screw member screwed into the attached member and the concave portion of the second screw member screwed into the attached member are eccentrically fitted.
- the tapered outer peripheral surface portion of the above is inserted into the bottom side inner peripheral surface portion of the recess.
- the outer peripheral surface of the convex portion may be a tapered surface having a predetermined taper angle over the entire axial region including the tapered outer peripheral surface portion and the tip outer peripheral surface portion.
- the tapered inner peripheral surface portion of the concave portion has the same taper angle as the outer peripheral surface of the convex portion, and the bottom side inner peripheral surface portion of the concave portion has a taper angle smaller than the outer peripheral surface of the convex portion. Good.
- the tapered inner peripheral surface portion of the concave portion interferes with the tapered outer peripheral surface portion of the convex portion in a part in the circumferential direction, and the bottom side inner circumference of the concave portion.
- the surface portion may be configured to gradually deviate from the outer peripheral surface portion of the tip of the convex portion in the radial direction toward the bottom side of the concave portion.
- the bottom side inner peripheral surface portion of the recess may be a right cylindrical surface having a taper angle of 0 °.
- the attached member comprises a screw shaft having a male screw provided on the outer circumference, and the first and second screw members each consist of a nut screwed on the screw shaft, and the first and second screw members have a screw shaft.
- the screw may be composed of a female screw.
- the attached member has a screw hole provided with a female screw on the inner circumference, and the first and second screw members are composed of screws screwed into the screw holes, respectively, and the first and second screw members are formed.
- the screw of the screw member may be composed of a male screw.
- the inclination of the first screw member with respect to the second screw member can be suppressed.
- the stress concentration at the time of eccentric fitting between the convex portion and the concave portion can be relaxed, and a radial pressing force along the eccentric direction can be efficiently generated with respect to the first and second screw members.
- the anti-loosening effect can be further increased.
- FIG. 1 is a cross-sectional view of the loosening prevention device according to the first embodiment.
- FIG. 2 is a four-view view of the upper nut of the loosening prevention device according to the first embodiment.
- FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.
- FIG. 4 is a perspective view of the upper nut of the loosening prevention device according to the first embodiment.
- FIG. 5 is a cross-sectional view of the locking device according to another disclosure.
- FIG. 6 is a perspective view of the lower nut of the loosening prevention device according to another disclosure.
- FIG. 7 is a cross-sectional view of the loosening prevention device according to the second embodiment.
- FIG. 8 is an enlarged cross-sectional view of FIG. 7.
- FIG. 9 is a design cross-sectional view of a conventional locking nut.
- FIG. 10 is a cross-sectional view of a conventional locking nut in an actually fastened state.
- the locking device includes a first nut having a screw hole screwed into the screw shaft and a second nut having a screw hole screwed into the screw shaft, and the first nut is provided.
- the nut has a convex portion that projects axially toward the second nut, and the convex portion has an outer peripheral surface including a tapered outer peripheral surface portion having a predetermined taper angle, and the first nut has a convex portion.
- the screw hole penetrates the convex portion along the axial direction, the second nut has a concave portion into which the convex portion fits, and the concave portion has a tapered inner circumference having a predetermined taper angle. It has an inner peripheral surface including a surface portion, and the screw hole of the second nut is opened to the bottom surface of the recess.
- one of the first and second nuts can function as a lower nut that is first fastened to the screw shaft, and the other can function as an upper nut that is fastened to the second screw shaft.
- the tapered outer peripheral surface portion of the convex portion is eccentric with respect to the screw hole of the first nut, and the tapered inner peripheral surface portion of the concave portion is the screw hole of the second nut. On the other hand, they are concentric.
- the tapered inner peripheral surface portion of the concave portion is eccentric with respect to the screw hole of the second nut, and the tapered outer peripheral surface portion of the convex portion is the screw hole of the first nut. Concentric with respect to.
- the locking device is in a state in which the convex portion of the first nut screwed into the screw shaft and the concave portion of the second nut screwed into the screw shaft are eccentrically fitted.
- the tapered outer peripheral surface and the tapered inner peripheral surface interfere with each other in a part in the circumferential direction so that a pressing force along the eccentric direction is generated in the first and second nuts, and the convex portion with respect to the concave portion. It can be configured so that the pressing force increases as the fitting depth increases.
- the outer peripheral surface of the convex portion of the first nut further includes a tip outer peripheral surface portion provided on the tip end side of the convex portion with respect to the tapered outer peripheral surface portion.
- the inner peripheral surface of the concave portion of the second nut further includes a bottom side inner peripheral surface portion provided on the bottom side of the concave portion with respect to the tapered inner peripheral surface portion.
- the outer peripheral surface of the convex portion and the inner peripheral surface of the concave portion can be formed.
- the outer peripheral surface of the convex portion may be a tapered surface having a predetermined taper angle over the entire axial region including the tapered outer peripheral surface portion and the tip outer peripheral surface portion.
- the tapered inner peripheral surface portion of the concave portion may have the same taper angle as the outer peripheral surface of the convex portion.
- the bottom side inner peripheral surface portion of the concave portion may have a taper angle smaller than the outer peripheral surface of the convex portion.
- the tapered inner peripheral surface portion of the concave portion interferes with the tapered outer peripheral surface portion of the convex portion in a part in the circumferential direction, and the bottom portion of the concave portion.
- the side inner peripheral surface portion gradually separates from the tip outer peripheral surface portion of the convex portion in the radial direction toward the bottom side of the concave portion.
- the bottom-side inner peripheral surface portion of the recess may be a right-sided cylindrical surface having a taper angle of 0 °.
- the inner peripheral surface portion on the bottom side of the recess may be formed in a reverse taper shape in which the diameter gradually increases toward the bottom side.
- the first nut having a convex portion can adopt the same configuration as the convex nut of the conventional hard lock nut.
- the second nut having a recess can be easily manufactured only by additional processing of the inner peripheral surface portion on the bottom side.
- the inner peripheral surface of the recess has a taper having a predetermined taper angle over the entire axial region including the tapered inner peripheral surface portion and the bottom side inner peripheral surface portion. It may be a face.
- the tapered outer peripheral surface portion of the convex portion may have the same taper angle as the inner peripheral surface of the concave portion.
- the outer peripheral surface portion of the tip of the convex portion may have a taper angle larger than that of the inner peripheral surface of the concave portion.
- the tapered outer peripheral surface portion of the convex portion interferes with the tapered inner peripheral surface portion of the concave portion in a part in the circumferential direction, and the convex portion
- the outer peripheral surface portion of the tip gradually separates in the radial direction from the inner peripheral surface portion on the bottom side of the recess as it reaches the tip side of the convex portion.
- the tip outer peripheral surface portion of the convex portion may be eccentric with respect to the tapered outer peripheral surface portion.
- the second nut having a recess can adopt the same configuration as the concave nut of the conventional hard lock nut.
- the first nut having a convex portion can be easily manufactured only by additional processing of the outer peripheral surface portion of the tip.
- the tapered outer peripheral surface portion of the convex portion and the tapered inner peripheral surface portion of the concave portion have the same taper angle
- the tip outer peripheral surface portion of the convex portion is the bottom side inner circumference of the concave portion. It may have a taper angle larger than the surface portion.
- the side inner peripheral surface portion gradually separates from the tip outer peripheral surface portion of the convex portion in the radial direction toward the bottom side of the concave portion.
- the bottom-side inner peripheral surface portion of the recess may be a right-sided cylindrical surface having a taper angle of 0 °.
- the inner peripheral surface portion on the bottom side of the recess may be formed in a reverse taper shape in which the diameter gradually increases toward the bottom side.
- the tip outer peripheral surface portion of the convex portion may be eccentric with respect to the tapered outer peripheral surface portion.
- the tapered outer peripheral surface portion of the convex portion may have substantially the same axial length as the tapered inner peripheral surface portion of the concave portion.
- FIG. 1 shows a loosening prevention device 1 according to a first embodiment of the present invention.
- the locking device 1 is composed of a lower nut 10 having a screw hole 11 screwed into the screw shaft S and an upper nut 20 having a screw hole 21 screwed into the screw shaft S.
- the lower nut 10 has a truncated cone-shaped convex portion 12 that projects axially toward the upper nut 20.
- the convex portion 12 projects from the upper surface of the nut body 13.
- the nut body 13 is typically in the form of a hexagon nut, but can have an appropriate outer peripheral surface shape.
- the outer peripheral surface of the convex portion 12 is continuously formed with a tapered outer peripheral surface portion 12a having a predetermined taper angle that gradually becomes smaller toward the tip side and a tip side of the convex portion 12 with respect to the outer peripheral surface portion 12a. Includes the tip outer peripheral surface portion 12b.
- the taper angles of the outer peripheral surface portion 12a and the outer peripheral surface portion 12b are the same. That is, the entire outer peripheral surface of the convex portion 12 including the outer peripheral surface portions 12a and 12b is composed of a single tapered surface.
- the tapered outer peripheral surface portion 12a of the convex portion 12 and the tapered inner peripheral surface portion 22a of the concave portion 22 have the same taper angle
- the tip outer peripheral surface portion 12b of the convex portion 12 is the bottom side inner peripheral surface of the concave portion 22.
- a structure having a taper angle larger than that of the portion 22b is realized.
- the taper angle of the tapered outer peripheral surface portion 12a of the convex portion 12 is preferably 10 ° or more and 30 ° or less, more preferably 15 ° or more and 25 ° or less, and further preferably 18 ° or more and 22 ° or less.
- the screw hole 11 of the lower nut 10 is provided over the nut body 13 and the convex portion 12. That is, the screw hole 11 penetrates the convex portion 12 and the nut body 13 along the axial direction. Further, the screw hole 11 is provided on the inner side in the radial direction with respect to the tip outer peripheral surface portion 12b of the convex portion 12.
- a predetermined amount of play can be provided between the female screw of the screw hole 11 and the male screw of the screw shaft S.
- the load-side flanks of the male and female threads are pressed against each other, and a minute gap is formed between the play-side flanks. It is not necessary that a play is provided between the male screw and the female screw. In this case, it is necessary to take some measures to prevent seizure, but a screw fastening structure that is hard to loosen can be obtained.
- the tapered outer peripheral surface portion 12a of the lower nut 10 is eccentric with respect to the screw hole 11 of the lower nut 10 by a small amount a. That is, the axial center O1 of the tapered outer peripheral surface portion 12a is parallel to the axial center O2 of the screw hole 11, and the distance between the axial center O1 and the axial center O2 is a.
- the upper nut 20 has a concave portion 22 into which the convex portion 12 fits.
- the concave portion 22 has a depth equal to the protruding height of the convex portion 12 or a predetermined amount larger than the protruding height of the convex portion 12.
- the upper nut 20 is typically in the form of a hexagon nut, but may have an appropriate outer peripheral surface shape. Further, preferably, a flange-shaped contact portion can be provided on the outer peripheral portion of the lower end of the upper nut 20 as disclosed in Patent Document 3.
- the inner peripheral surface of the concave portion 22 has a taper angle that matches the taper angle of the outer peripheral surface of the convex portion 12, preferably a tapered inner peripheral surface portion 22a having the same taper angle, and a concave portion 22 rather than the inner peripheral surface portion 22a.
- a bottom side inner peripheral surface portion 22b provided on the bottom side.
- the bottom side inner peripheral surface portion 22b is formed of a straight cylindrical surface, but may be formed of a tapered surface having a taper angle smaller than the taper angle of the outer peripheral surface of the convex portion 12. It may be composed of a reverse taper surface having a negative taper angle, that is, the diameter gradually increases toward the bottom side of the 22.
- the screw hole 21 of the upper nut 20 is open to the bottom surface of the recess 22. That is, the screw hole 21 is located inward in the radial direction with respect to the portion having the smallest diameter on the outer surface of the upper nut 20.
- the convex portion 12 of the lower nut 10 and the concave portion 22 of the upper nut 20 are eccentrically fitted, so that a wedge is driven between the screw shaft S and each of the nuts 10 and 20. It causes such a stress state and exerts a strong anti-loosening effect due to the wedge action.
- the tapered outer peripheral surface portion 12a of the convex portion 12 of the lower nut 10 is eccentric with respect to the screw hole 11, and the concave portion 22 is formed.
- the tapered inner peripheral surface portion 22a and the screw hole 21 are provided concentrically.
- the outer peripheral surface of the convex portion 12 and the inner peripheral surface of the concave portion 22 interfere with each other in a part in the circumferential direction.
- the maximum diameter portion of the tapered outer peripheral surface portion 12a of the convex portion 12 has substantially the same diameter as the maximum diameter portion of the tapered inner peripheral surface portion 22a of the concave portion 22, thereby causing the convex portion 12 to have a maximum diameter portion.
- the lower nut 10 is first fastened to the screw shaft S with a predetermined fastening torque, and then the upper nut 20 is fastened to the screw shaft S with a predetermined fastening torque. Obtained by doing.
- the lower nut 10 is fastened so that the screw holes 11 of the lower nut 10 are concentric with the screw shaft S, whereby an axial force is generated on the screw shaft S and a large bearing surface of the lower nut 10 is generated. Friction force is generated.
- the upper nut 20 can be slightly moved with respect to the screw shaft S by the amount of play between the female screw of the screw hole 21 and the male screw of the screw shaft S. Therefore, due to the eccentric fitting of the convex portion 12 and the concave portion 22, as shown in FIG. 1, the load side flank of the female screw of the screw hole 21 and the male screw of the screw shaft S in a part in the circumferential direction (the screwed portion on the right side of the drawing). While the flanks on the play side and each other are in pressure contact with each other, the female screw of the screw hole 21 is floating from the male screw of the screw shaft S on the side opposite to the pressure contact portion in the radial direction (the screwed portion on the left side of the drawing), or the load side. Only Frank is in light contact.
- the tip portion of the convex portion 12 does not contact the inner peripheral surface of the concave portion 22, the amount of inclination of the upper nut 20 when the upper nut 20 is fastened is suppressed, and the axial center of the upper nut 20 is suppressed even when the fastening is completed.
- O3 is substantially parallel to the axis O2 of the lower nut 10.
- the tapered outer peripheral surface portion 12a of the convex portion 12 and the tapered inner peripheral surface portion 22a of the concave portion 22 are in a surface contact state or line contact at a pressure contact portion of a part in the circumferential direction (contact portion on the left side in FIG. 1).
- the pressing force in the radial direction along the eccentric direction generated in the convex portion 12 is dispersed in the axial direction of the convex portion 12.
- the gap between the tapered outer peripheral surface portion 12a and the tapered inner peripheral surface portion 22a on the side opposite to the pressure contact portion in the radial direction can be narrowed, preferably brought into contact with each other. A stable anti-loosening effect can be exhibited.
- the outer peripheral surface structure of the convex portion 12 and the inner peripheral surface structure of the concave portion 22 are different from the loosening prevention device 1 of the first embodiment, that is, the convex portion 12
- the tip outer peripheral surface portion 12b has a taper angle larger than that of the tapered outer peripheral surface portion 12a, and is eccentric with respect to the tapered outer peripheral surface portion 12a, but is provided concentrically with respect to the screw hole 11. Has been done.
- the tapered inner peripheral surface portion 22a and the bottom side inner peripheral surface portion 22b of the recess 22 have the same taper angle. That is, the entire inner peripheral surface of the recess 22 including the inner peripheral surface portions 22a and 22b is composed of a single tapered surface.
- the tapered outer peripheral surface portion 12a of the convex portion 12 and the tapered inner peripheral surface portion 22a of the concave portion 22 have the same taper angle
- the tip outer peripheral surface portion 12b of the convex portion 12 is the bottom side inner peripheral surface of the concave portion 22.
- a structure having a taper angle larger than that of the portion 22b is realized.
- the loosening prevention device 1' is composed of a first screw 10'screwed into the screw hole H of the mounted member A having a screw hole H and a second screw 20'screwed into the screw hole H. It is composed.
- the locking device 1' can be used as a set screw for fixing the tubular or rod-shaped member B inserted into the tubular attached member A to the attached member A.
- the attached member A has a screw hole H penetrating in the radial direction, and after fastening and fixing the second screw 20'to the member B, the first screw 10'is attached to the second screw 20'. By fastening the screws, a strong anti-loosening action can be generated.
- the first screw 10' has a truncated cone-shaped convex portion 12'protruding axially toward the second screw 20.
- the convex portion 12' protrudes from the tip surface of the screw body 13'.
- the screw body 13' is in the form of a screw shaft provided with a male screw on the outer circumference. It is preferable to provide a tool engaging hole 14'in which a tool such as a hexagon wrench can be engaged on the outer end surface of the screw body 13'.
- the outer peripheral surface of the convex portion 12' is a tapered outer peripheral surface portion 12a'having a predetermined taper angle that gradually becomes smaller toward the tip side, and the outer peripheral surface portion 12a'on the tip end side of the convex portion 12a'. Includes a continuously formed tip outer peripheral surface portion 12b'.
- the taper angles of the outer peripheral surface portion 12a'and the outer peripheral surface portion 12b' are the same. That is, the entire outer peripheral surface of the convex portion 12'including the outer peripheral surface portions 12a'and 12b' is composed of a single tapered surface.
- the tapered outer peripheral surface portion 12a'of the convex portion 12'and the tapered inner peripheral surface portion 22a' of the concave portion 22' have the same taper angle
- the tip outer peripheral surface portion 12b'of the convex portion 12' is the concave portion 22'.
- a structure having a taper angle larger than that of the inner peripheral surface portion 22b on the bottom side of' is realized.
- the taper angle of the tapered outer peripheral surface portion 12a'of the convex portion 12' is preferably 10 ° or more and 30 ° or less, more preferably 15 ° or more and 25 ° or less, and further preferably 18 ° or more and 22 ° or less. is there.
- the convex portion 12'of the first screw 10' projects to the tip side in the axial direction from the male screw on the outer circumference of the screw body 13'. Further, the diameter of the male screw is larger than the diameter of the maximum diameter portion of the convex portion 12'.
- a predetermined amount of play can be provided between the female screw of the screw hole H and the male screw of the first screw 10'.
- the screw 10' is fastened to the screw hole H, the load-side flanks of the male and female screws are pressed against each other, and a minute gap is formed between the play-side flanks. It is not necessary that a play is provided between the male screw and the female screw. In this case, it is necessary to take some measures to prevent seizure, but a screw fastening structure that is hard to loosen can be obtained.
- the tapered outer peripheral surface portion 12a'of the screw 10' is eccentric with respect to the male screw 11'of the screw 10' by a small amount.
- the second screw 20' has a recess 22'to which the convex portion 12'fits.
- the concave portion 22' has a depth similar to the protruding height of the convex portion 12'or a predetermined amount larger than the protruding height of the convex portion 12'.
- the screw 20' may be in the form of a screw shaft provided with a male screw on the outer circumference.
- the inner peripheral surface of the concave portion 22' is from a tapered inner peripheral surface portion 22a'having a taper angle matching the taper angle of the outer peripheral surface of the convex portion 12', preferably the same taper angle, and the inner peripheral surface portion 22a'. Also includes a bottom side inner peripheral surface portion 22b'provided on the bottom side of the recess 22'.
- the bottom side inner peripheral surface portion 22b' is formed of a straight cylindrical surface, but may be formed of a tapered surface having a taper angle smaller than the taper angle of the outer peripheral surface of the convex portion 12'.
- the diameter gradually increases toward the bottom side of the recess 22', in other words, it may be composed of a reverse taper surface having a negative taper angle.
- a tool engaging hole 24'for engaging a rotary tool such as a hexagon wrench is provided on the bottom side (back side) of the recess 22 composed of the tapered inner peripheral surface portion 22a and the bottom side inner peripheral surface portion 22b. It is preferable to keep it.
- the inner peripheral surface of the tool engaging hole 24' is not a tapered surface, and the tool engaging hole 24'is a non-circular hole that matches the shape of the tool.
- the hole 24' is formed as an opening on the bottom surface of the recess 22 inside the inner peripheral surface portion 22a on the bottom side in the radial direction.
- the male screw 21'of the screw 20' is provided over the entire axial length of the screw 20'. That is, the recess 22'is located inward in the radial direction of the male screw 21'.
- the convex portion 12'of the screw 10'and the concave portion 22'of the screw 20' are eccentrically fitted to each other between the screw hole H and the screws 10'and 20'. It creates a stress state as if a screw was driven into the machine, and exerts a strong anti-loosening effect due to the wedge action.
- the tapered outer peripheral surface portion 12a'of the convex portion 12' is eccentric with respect to the male screw 11', and the concave portion 22 is formed.
- the tapered inner peripheral surface portion 22a'and the male screw 21' are provided concentrically.
- the outer peripheral surface of the convex portion 12'and the inner peripheral surface of the concave portion 22' interfere with each other in a part in the circumferential direction.
- the maximum diameter portion of the tapered outer peripheral surface portion 12a'of the convex portion 12' has substantially the same diameter as the maximum diameter portion of the tapered inner peripheral surface portion 22a'of the concave portion 22'. The greater the fitting depth of the convex portion 12'with respect to the concave portion 22', the greater the repulsive force along the eccentric direction.
- the stress state when the screws 10'and 20' are fastened and the contact state of the load side flank and the play side flank of the screw are the same as those in the first embodiment.
- the present invention is not limited to the above-mentioned embodiment structure, and the design can be appropriately changed within the scope of the invention described in the claims.
- the inner peripheral surface portion on the bottom side of the concave portion is formed over the entire circumference, but the tapered inner circumference is formed only in the circumferential portion where the convex portion and the concave portion are pressure-contacted by eccentric fitting. It is also possible to provide a bottom side inner peripheral surface portion having a taper angle smaller than that of the surface portion.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
- Connection Of Plates (AREA)
- Fuel-Injection Apparatus (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Processing Of Meat And Fish (AREA)
- Revetment (AREA)
- Window Of Vehicle (AREA)
Abstract
Description
10 第1のナット(第1のねじ部材)
11 ねじ(雌ねじ)
12 凸部
12a テーパー状外周面部分
12b 先端外周面部分
20 第2のナット(第2のねじ部材)
21 ねじ(雌ねじ)
22 凹部
22a テーパー状内周面部分
22b 底部側内周面部分
1’ 緩み止め装置
10’ 第1のスクリュー(第1のねじ部材)
11’ ねじ(雄ねじ)
12’ 凸部
12a’ テーパー状外周面部分
12b’ 先端外周面部分
20’ 第2のスクリュー(第2のねじ部材)
21’ ねじ(雄ねじ)
22’ 凹部
22a’ テーパー状内周面部分
22b’ 底部側内周面部分
Claims (4)
- 被取付部材に螺合するねじを有する第1のねじ部材と、前記被取付部材に螺合するねじを有する第2のねじ部材とを備え、
第1のねじ部材は、第2のねじ部材に向かって軸方向に突出する凸部を有し、該凸部は、所定のテーパー角を有するテーパー状外周面部分を含む外周面を有し、
第2のねじ部材は、前記凸部が嵌合する凹部を有し、該凹部は、所定のテーパー角を有するテーパー状内周面部分を含む内周面を有し、
前記凸部のテーパー状外周面部分が第1のねじ部材のねじに対して偏心され且つ前記凹部のテーパー状内周面部分が第2のねじ部材のねじに対して同心状であるか、若しくは、前記凹部のテーパー状内周面部分が第2のねじ部材のねじに対して偏心され且つ前記凸部のテーパー状外周面部分が第1のねじ部材のねじに対して同心状であり、
前記被取付部材に螺合された第1のねじ部材の前記凸部と前記被取付部材に螺合された第2のねじ部材の前記凹部とが偏心嵌合した状態で、第1及び第2のねじ部材に前記偏心方向に沿う押圧力が生じるように周方向一部において前記テーパー状外周面と前記テーパー状内周面とが干渉するとともに、前記凸部の前記凹部に対する嵌合深さが大きい程前記押圧力が大きくなるように構成された緩み止め装置において、
第1のねじ部材の前記凸部の外周面は、前記テーパー状外周面部分よりも前記凸部の先端側に設けられた先端外周面部分をさらに含み、
第2のねじ部材の前記凹部の内周面は、前記テーパー状内周面部分よりも前記凹部の底部側に設けられた底部側内周面部分をさらに含み、
前記被取付部材に螺合された第1のねじ部材の前記凸部と前記被取付部材に螺合された第2のねじ部材の前記凹部とが偏心嵌合した状態で、前記凸部のテーパー状外周面部分が周方向一部において前記凹部のテーパー状内周面部分に干渉するが、前記凸部の先端外周面部分と前記凹部の底部側内周面部分との間に全周にわたって隙間が形成されるように、前記凸部の外周面及び前記凹部の内周面が構成されており、
前記凸部の外周面は、前記テーパー状外周面部分及び前記先端外周面部分を含む軸方向の領域全体に亘って所定のテーパー角を有するテーパー面であり、
前記凹部のテーパー状内周面部分は前記凸部の外周面と同じテーパー角を有し、前記凹部の底部側内周面部分は前記凸部の外周面よりも小さなテーパー角を有し、
前記凸部と前記凹部とが偏心嵌合した状態で、前記凹部のテーパー状内周面部分は周方向一部において前記凸部のテーパー状外周面部分に干渉し、前記凹部の底部側内周面部分は前記凹部の底部側に至るにしたがって前記凸部の先端外周面部分から徐々に径方向に離反するよう構成されている、
緩み止め装置。 - 請求項1に記載の緩み止め装置において、
前記凹部の底部側内周面部分は、テーパー角が0°の直円筒面である、緩み止め装置。 - 請求項1又は2に記載の緩み止め装置において、
前記被取付部材はねじ軸からなり、第1及び第2のねじ部材はそれぞれ前記ねじ軸に螺号するナットからなり、第1及び第2のねじ部材の前記ねじは雌ねじからなる、緩み止め装置。 - 請求項1又は2に記載の緩み止め装置において、
前記被取付部材はねじ穴を有し、第1及び第2のねじ部材はそれぞれ前記ねじ穴に螺合するスクリューからなり、第1及び第2のねじ部材の前記ねじは雄ねじからなる、緩み止め装置。
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2020409196A AU2020409196A1 (en) | 2019-12-20 | 2020-09-29 | Loosening prevention device |
CA3165301A CA3165301C (en) | 2019-12-20 | 2020-09-29 | Anti-loosening device |
CN202080088766.3A CN114867947A (zh) | 2019-12-20 | 2020-09-29 | 防松装置 |
PE2022001154A PE20221436A1 (es) | 2019-12-20 | 2020-09-29 | Dispositivo anti-aflojamiento |
BR112022012012A BR112022012012A2 (pt) | 2019-12-20 | 2020-09-29 | Dispositivo anti-afrouxamento |
US17/786,690 US20230020266A1 (en) | 2019-12-20 | 2020-09-29 | Loosening prevention device |
KR1020227024602A KR20220114070A (ko) | 2019-12-20 | 2020-09-29 | 풀림 방지 장치 |
EP20903780.3A EP4080071A4 (en) | 2019-12-20 | 2020-09-29 | DEVICE FOR PREVENTING LOOSENING |
MX2022007612A MX2022007612A (es) | 2019-12-20 | 2020-09-29 | Dispositivo anti-aflojamiento. |
ZA2022/06828A ZA202206828B (en) | 2019-12-20 | 2022-06-20 | Loosening prevention device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2019230031A JP6762591B1 (ja) | 2019-12-20 | 2019-12-20 | 緩み止め装置 |
JP2019-230031 | 2019-12-20 |
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WO2021124636A1 true WO2021124636A1 (ja) | 2021-06-24 |
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PCT/JP2020/036847 WO2021124636A1 (ja) | 2019-12-20 | 2020-09-29 | 緩み止め装置 |
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US (1) | US20230020266A1 (ja) |
EP (1) | EP4080071A4 (ja) |
JP (2) | JP6762591B1 (ja) |
KR (1) | KR20220114070A (ja) |
CN (1) | CN114867947A (ja) |
AU (1) | AU2020409196A1 (ja) |
BR (1) | BR112022012012A2 (ja) |
CA (1) | CA3165301C (ja) |
CL (1) | CL2022001665A1 (ja) |
MX (1) | MX2022007612A (ja) |
PE (1) | PE20221436A1 (ja) |
TW (1) | TWI748680B (ja) |
WO (1) | WO2021124636A1 (ja) |
ZA (1) | ZA202206828B (ja) |
Cited By (1)
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JP7116899B1 (ja) * | 2021-01-30 | 2022-08-12 | 株式会社貴匠技研 | 緩み防止機能を有するコンビネーションナット |
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CL2022001665A1 (es) | 2023-01-20 |
TWI748680B (zh) | 2021-12-01 |
JP6762591B1 (ja) | 2020-09-30 |
CA3165301C (en) | 2023-12-19 |
US20230020266A1 (en) | 2023-01-19 |
KR20220114070A (ko) | 2022-08-17 |
AU2020409196A1 (en) | 2022-07-07 |
JP2021099114A (ja) | 2021-07-01 |
CA3165301A1 (en) | 2021-06-24 |
JP2021099156A (ja) | 2021-07-01 |
ZA202206828B (en) | 2023-11-29 |
PE20221436A1 (es) | 2022-09-21 |
EP4080071A4 (en) | 2024-01-10 |
CN114867947A (zh) | 2022-08-05 |
TW202126920A (zh) | 2021-07-16 |
BR112022012012A2 (pt) | 2022-08-30 |
EP4080071A1 (en) | 2022-10-26 |
MX2022007612A (es) | 2022-09-26 |
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