WO2017183593A1 - 雄ねじ体、雌ねじ体、ねじ体設計方法、ねじ山構造 - Google Patents
雄ねじ体、雌ねじ体、ねじ体設計方法、ねじ山構造 Download PDFInfo
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- WO2017183593A1 WO2017183593A1 PCT/JP2017/015372 JP2017015372W WO2017183593A1 WO 2017183593 A1 WO2017183593 A1 WO 2017183593A1 JP 2017015372 W JP2017015372 W JP 2017015372W WO 2017183593 A1 WO2017183593 A1 WO 2017183593A1
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- 238000013461 design Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 18
- 238000012795 verification Methods 0.000 claims description 64
- 238000012360 testing method Methods 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000004323 axial length Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- 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
-
- 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
-
- 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
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
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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
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
- F16B2033/025—Shape of thread; Special thread-forms with left-hand thread
-
- 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
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/06—Screwed connections specially modified in view of tensile load; Break-bolts having regard to possibility of fatigue rupture
Definitions
- the present invention relates to a special screw thread structure, a male screw body and a female screw body having the special screw thread structure, a method for designing the special screw thread, and a screw body having the special screw thread.
- a so-called male screw body such as a bolt
- a so-called female screw body such as a nut
- two types of spiral grooves (for example, a male screw portion by a right spiral groove and a male screw portion by a left spiral groove) having different lead angles and / or lead directions are formed on one male screw body.
- two types of female threaded bodies (for example, a right female threaded body and a left female threaded body) are screwed separately into the two types of spiral grooves, such as a double nut.
- the thread angle is 60 ° for metric coarse threads and metric fine threads, 60 ° for unified coarse threads and unified fine threads, 55 ° for wit coarse threads, and miniature screws. In this case, the angle is 60 °, but the theoretical basis for the angle is not always clear.
- the present invention has been made by the inventors' diligent research in view of the above problems.
- the fastening force is The purpose is to provide technical ideas for maintaining a high level.
- the present invention that achieves the above object is formed on the shaft, the first spiral groove formed on the peripheral surface of the shaft, and set in an appropriate lead angle and / or lead direction, and the peripheral surface of the shaft
- a second spiral groove set in a different lead angle and / or lead direction with respect to the lead angle and / or lead direction, and the first spiral groove and the second spiral groove are When having a thread part formed in a strip shape by being superimposed on the same region in the axial direction of the shaft part, the thread part, when viewing the cross section along the axial direction in the direction orthogonal to the axis,
- the male screw body is characterized in that a mountain angle formed by a pair of slopes extending from the top of the screw thread toward the valley is set to 61 ° or more and 75 ° or less.
- the mountain angle is set to 73 ° or less.
- the mountain angle is set to 65 ° or more.
- the mountain angle is set in a range of 70 ° ⁇ 3 °.
- the present invention that achieves the above object has an internal thread portion, and the internal thread portion constituting the internal thread portion is directed from the top of the internal thread portion to the valley when viewed in the direction perpendicular to the axis in the cross section along the axial direction.
- the female threaded body is characterized in that a mountain angle formed by a pair of slopes extending in the range of 61 ° to 75 ° is set.
- the male screw body In relation to the female screw body, the male screw body according to any one of the above is configured to be screwable.
- the present invention that achieves the above object uses a plurality of verification male screw bodies having different nominal angles and different crest angles and valley diameters, and a plurality of verification female screw bodies that are screwed into the verification male screw bodies.
- the valley diameter that can be in the vicinity of the boundary (hereinafter referred to as the boundary valley diameter) Border
- An axial fracture dominant mountain angle selection step for selecting a specific mountain angle at which the valley diameter can be the maximum value (hereinafter referred to as an axial fracture dominant mountain angle), and a mountain angle approximating the axial fracture dominant mountain angle, and a thread angle determining step applied to the actual male screw body and / or the female screw body at a nominal diameter.
- the boundary valley diameter extraction step includes a plurality of the verification male screw bodies in which the crest angle and the nominal diameter are constant and the valley diameters are different, and the verification external threads.
- the individual boundary valley diameter extraction step for extracting the specific valley diameter (hereinafter referred to as the boundary valley diameter) that can be in the vicinity of the boundary between the shaft fracture form and the thread crushing form, and a plurality of the mountain angles different from each other Select each mountain corner Based on the By repeating individual boundary valley ⁇ out process, characterized in that it and a step of extracting the degree of change of the boundary root diameter due to the mountain angle variable.
- the present invention that achieves the above object is a male screw body that is designed based on the above screw body design method.
- the present invention that achieves the above object is an internal thread body that is designed based on the above thread body design method.
- the present invention that achieves the above object is a thread structure applied to an external thread body and / or an internal thread body, and a mountain formed by a pair of slopes extending from the top of the thread to the valley in the thread structure.
- the angle is set to 67 ° or more and 73 ° or less.
- the fastening strength between the male screw body and the corresponding female screw body is improved.
- the fastening force can be maintained at a high level over a long period of time.
- (B) is a top view. It is (A) front sectional drawing of the fastening structure, and (B) side sectional drawing.
- (A) is a front sectional view of the female screw body, and (B) is a front sectional view of the female screw body whose spiral direction is opposite to that of the female screw body.
- (A) is sectional drawing which expands and shows the cross-sectional shape of the screw thread of the same male screw body
- (B) is sectional drawing which expands and shows the cross-sectional shape of the screw thread of the same female screw body.
- (A) is a matrix showing a verification external thread group used in the screw design method according to the embodiment of the present invention
- (B) is a verification internal thread group used in the screw design method according to the embodiment of the present invention. It is a matrix which shows. It is a figure which shows the aspect of the fastening strength test of the external thread body for the verification, and the internal thread body for the verification.
- the fastening structure 1 of the male screw body 10 and the female screw body 100 is configured by screwing the female screw body 100 into the male screw body 10.
- the male screw body 10 is provided with a male screw portion 13 in which a male screw spiral groove is formed from the base side of the shaft portion 12 toward the shaft end.
- the male screw portion 13 has a first spiral groove 14 serving as a right screw configured to be able to be screwed with a female screw-shaped spiral strip serving as a corresponding right screw, and a female screw-shaped serving as a corresponding left screw.
- Two types of male threaded spiral grooves are formed on the same region in the axial direction of the male threaded body 10, with the second spiral groove 15 serving as a left-hand thread configured to be able to screw the spiral strip.
- a single spiral groove region formed by forming a spiral groove in one direction may be provided.
- the first spiral groove 14 can be screwed with a female thread-like spiral strip that is a right-hand thread of the female screw body 100 corresponding to the first spiral groove 14, and the second spiral groove 15 is a female screw body 100 (this is the above-described one). It can be screwed with a female thread-like spiral strip as a left-hand thread (including a case of a separate body from a female thread body having a right thread).
- the male screw portion 13 has a substantially crescent-shaped thread extending in the circumferential direction in the surface direction perpendicular to the axis (screw shaft) C.
- Mountains G are alternately provided on one side (left side in the figure) and the other side (right side in the figure) of the male screw part 13 in the diameter direction. That is, the ridge line of the thread G extends perpendicular to the axis, and the height of the thread G changes so that the center in the circumferential direction becomes higher and both ends in the circumferential direction gradually become lower.
- the male screw portion 13 can be screwed with any of the right and left screw female screw bodies.
- Japanese Patent No. 4666313 related to the inventor of the present application.
- the female screw body 100 is constituted by a cylindrical member 106.
- the tubular member 106 has a so-called hexagonal nut shape and has a through-hole portion 106a at the center.
- the general shape of the female screw body 100 is not limited to the hexagonal nut shape, and can be arbitrarily set as appropriate, such as a cylindrical shape, a shape having a knurled circumferential surface, a square shape, and a star shape.
- a first female thread spiral strip 114 as a right-hand thread is formed in the through-hole portion 106a. That is, the first female screw spiral strip 114 of the cylindrical member 106 is screwed with the first spiral groove 14 in the male screw portion 13 of the male screw body 10.
- a second female screw spiral 115 as a left screw may be formed in the through hole portion 106a.
- the second female screw spiral 115 is screwed with the second spiral groove 15 in the male screw portion 13 of the male screw body 10.
- the shape of the thread P of the first female screw spiral 114 of the female screw body 100 and / or the second female screw spiral 115 of the female screw body 101 is the shape of the thread G of the male screw body 10. Therefore, the detailed description is omitted here.
- the nominal diameter of the male screw body 10 of the present embodiment is called with an initial letter N.
- N the diameter of the male threaded body 10 of N16
- the diameter F at the apex Gt of the thread G is 16 mm
- the diameter of the thread valley is 16 mm.
- the thread angle T of the thread G (the thread angle means an angle formed by a pair of slopes extending from the top of the thread G toward the valley) is set in a range of 61 ° to 75 °, More preferably, it is set in the range of 63 ° or more and 73 ° or less, more preferably 65 ° or more and 73 ° or less, and more specifically 70 °.
- the root diameter D of the thread G (that is, the outer diameter when the thread G is omitted in the shaft portion 12 of the male thread body 10) is set to 13.5 mm or more and 14.3 mm or less in the case of N16. It is preferable.
- the valley diameter D in the case of N16 is preferably set to 13.5 mm or more and 14.3 mm or less.
- the valley diameter D in the case of N24 is preferably set to 19.6 mm or more and 20.5 mm or less.
- the valley diameter D in the case of N30 is preferably set to 25.8 mm or more and 26.7 mm or less.
- the valley diameter referred to here is not the effective diameter as used in the conventional metric screw, but corresponds to the diameter of the valley bottom portion.
- the thread angle Q of the thread P is set in the range of 61 ° to 75 °, more preferably 63 ° to 73 °. More preferably, it is set to 65 ° or more and 73 ° or less, and more specifically 70 °.
- the peak diameter E of the apex Pt of the thread P is preferably set to 13.5 mm or more and 14.3 mm or less.
- the peak diameter E in the case of N16 is preferably set to 13.5 mm or more and 14.3 mm or less.
- the peak diameter E in the case of N24 is preferably set to 19.6 mm or more and 20.5 mm or less.
- the peak diameter E in the case of N30 is preferably set to 25.8 mm or more and 26.7 mm or less.
- the setting of the thread diameter of the female screw needs to be set to be equal to or greater than the valley diameter of the male screw body.
- ⁇ Preparation of series of male screw body 10 and female screw body 100 First, regarding the male screw body 10 having the nominal diameter N16, as shown in FIG. 7A, a plurality of different valley diameters D1, D2,..., Dn and a plurality of different mountain angles T1, T2,. .., A plurality of verification external thread bodies 10 (Tn, Dn) are prepared so as to fill a part or all of the matrix conditions composed of Tn.
- the same number of verification female screw bodies 100 that can be screwed together are prepared corresponding to each of the plurality of verification male screw bodies 10 (Tn, Dn). That is, as shown in FIG. 7B, a matrix composed of a plurality of different crest diameters E1, E2,..., En and a plurality of crest angles Q1, Q2,.
- a plurality of verification internal thread bodies 100 (Qn, En) are prepared so as to fill all or part of the conditions.
- the crest diameter En of the verification female screw body 100 (Qn, En) substantially matches the valley diameter Dn of the verification male screw body 10 (Tn, Dn), and the crest angle Qn is equal to the verification male screw body 10. This substantially coincides with the peak angle Tn of (Tn, Dn).
- the verification male screw body 10 (Tn, Dn) and the verification female screw body 100 (Qn, En) existing at the same position on the matrix of FIG. 7A and FIG. Many sets are prepared.
- the axial length W of the verification female screw body 100 (Qn, En) (this is also called the axial length W, see FIG. 1) is the same for all test bodies in the fastening strength test at the nominal diameter N16.
- the predetermined ratio ⁇ (0 ⁇ ⁇ 1) specific to the material with respect to the nominal diameter N16 that is, in the case of N16, the axial length W of the verification female screw body 100 (Qn, En) is set to 16 mm ⁇ ⁇ .
- the value of W is calculated by multiplying a predetermined ratio ⁇ that is a material specific value for each nominal diameter.
- the axially applied length W is approximately the tensile strength H that the axially perpendicular section 12A of the shaft portion 12 of the male screw body 10 can withstand, and the thread of the male screw body 10 at the axially applied length W.
- a value is selected such that the shear strength S of the peripheral surface J composed of the basal plane GL of G (see FIG. 6A) can be approximated.
- the coefficients a1 and a2 vary depending on the material of the base material, etc., but according to the study of the present inventor, in this embodiment, a general-purpose steel material such as S45C or SCM435 is selected as the base material, and W is the above-described value. It is known that the tensile strength H and shear strength S are very close to each other when set as described above. As a result, the fastening strength between the verification female screw body 100 (Qn, En) and the verification male screw body 10 (Tn, Dn) changes in the mountain angle T and the valley diameter D. It becomes slightly larger or the tensile strength H side becomes slightly larger. Which is superior may be verified by a fastening strength test, and the boundary between the shear strength S-dominant state and the tensile strength H-dominant state can be found by experiment.
- the valley diameter D, the mountain angle T, and the like are varied using the matrix shown in FIG. 7 is illustrated, but in actuality, for verification, all the locations of the matrix are filled. It is not necessary to prepare the male screw body 10 (Tn, Dn) and the verification female screw body 100 (Qn, En), and it is not necessary to form a matrix. As will be described later, any mode may be used as long as the optimum value can be extracted by a combination of the verification external thread body and the verification internal thread body in which the valley diameter D and the peak angle T vary within a certain range.
- a verification male screw body 10 (Tn, Dn) and a verification female screw body 100 (Qn, En) (hereinafter referred to as a verification bolt and nut set) are screwed together to perform a fastening strength test.
- a verification bolt and nut set a verification bolt and nut set
- the verification external thread body 10 (Tn, Dn) and the verification internal thread body 100 (Qn, En) are relatively separated in the axial direction (see arrow A).
- a so-called screw tightening test for verifying the torque, axial force, and rotation angle of the screw body may be used, and there is a correlation between these test results and the tensile test results. It has been confirmed that there is sex.
- a fastening strength test is performed on all the bolt and nut sets for verification, and the result is a shaft fracture form in which the fastening is released by breaking at the shaft portion 12 of the male screw body 100, or the thread G is deformed or collapsed. It is judged whether it becomes the screw thread collapse form which fastening is cancelled
- Fig. 9 shows an example of a graph of this determination result.
- the horizontal axis is set to the peak angle Tn
- the vertical axis is set to the valley diameter Dn
- the verification bolt and nut set in the shaft fracture configuration is indicated by ⁇
- the verification bolt and nut set in the screw thread collapse configuration is indicated by ⁇ .
- This boundary line K is defined as the change in the peak angle Tk and the boundary valley when the value of the maximum valley diameter that can cause the axial fracture form corresponding to a specific peak angle Tk is defined as the boundary valley diameter Dk. This means a correlation of changes in the diameter Dk.
- the design philosophy of setting the crest angle T to 68 ° and the shank valley diameter D to 14.1 mm or more belongs to the thread collapse region X. This means that there is a high possibility that a thread crushing form will occur, and it can be considered that the design is such that the strength of the shaft portion is wasted.
- the design concept of setting the peak angle T to 68 ° and the valley diameter D of the shaft portion to 13.6 mm is easy to obtain a shaft fracture form at the time of fastening release, but the boundary valley diameter Dk is about 14.05 mm. Therefore, if it is within that range, it means that the valley diameter D of the shaft portion can be set larger and the tensile strength can be increased, which means that the design is inefficient.
- the permissible range of the boundary mountain angle Tk that allows the male threaded body to be in an axially fractured form corresponding to the change in the boundary valley diameter Dk (this is referred to as the boundary mountain angle region Ts). Can be determined).
- a peak angle (hereinafter referred to as an axial fracture dominant peak angle Tp) at which the boundary valley diameter Dk can be the maximum value is selected in the boundary line K.
- the shaft fracture dominant mountain angle Tp is 70.5 °. Even if the shaft portion is made as thick as possible and the tensile strength is increased, the shaft breaking dominant mountain angle Tp has the highest mountain angle that is easy to lead to the shaft breaking mode, that is, the shear strength S on the mountain G side. It can be explained as an easy mountain angle.
- the design is performed by applying a crest angle approximating the determined shaft fracture dominant crest angle Tp to the actual male screw body 10 and / or the female screw body 100 at the nominal diameter N16.
- the valley diameter D can be set large.
- a specific valley diameter D for example, about 14.25 mm is preferable.
- FIG. 10 shows a graph of the verification result in the case of the nominal diameter N24
- FIG. 11 shows a graph of the verification result in the case of the nominal diameter N30.
- the axial break dominant peak angle Tp is in the range of 61 ° to 75 °, more preferably in the range of 65 ° to 73 °, and generally 70 °.
- the thread angle is not 60 °, which is the conventional common sense, but a value larger than that is suitable, and the vicinity of 70 ° is the optimum value. I understand that.
- the pair of the first spiral groove 14 and the female screw spiral thread 114 and the pair of the second spiral groove 15 and the female thread spiral thread 115 are in a reverse screw relationship (although the case where the lead angle is the same and the lead direction is opposite is illustrated, the present invention is not limited to this.
- the first spiral groove 14 and the female thread spiral 114, and the second spiral groove 15 and the female thread spiral 115 having the same lead direction (L1, L2) and different lead angles may be employed. it can.
- a spiral groove having a different lead angle is formed on the first spiral groove 14 so as to overlap with the first spiral groove 14 having a lead L1 (lead angle ⁇ 1) and a lead L2 (lead angle ⁇ 2).
- the second spiral groove 15 is formed with the screw directions aligned.
- the threads G1 and G2 since the first thread G1 of the first spiral groove 14 and the second thread G2 of the second spiral groove 15 are not shared but are separated, at least one of the threads G1 and G2 is provided.
- the present invention may be applied and may be applied to both.
- the thread angle of the first thread G1 and the thread angle of the second thread G2 may be different from each other.
- the case of the male screw body 10 having a double helix structure is illustrated.
- the present invention is not limited to this, and even in the male screw body 10 having a single helix structure, the above-described design procedure is optimal. It is possible to theoretically and / or experimentally clarify the peak angle.
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Abstract
Description
図1及び図2に示すように、本実施形態に係る雄ねじ体10及び雌ねじ体100の締結構造1は、雌ねじ体100を雄ねじ体10に螺合させることによって構成される。
次に、雄ねじ体10及び雌ねじ体100の設計手法及び設計根拠について以下に説明する。なお、ここでは呼び径N16の雄ねじ体10を設計する際の事例を紹介する。
先ず、呼び径N16と成る雄ねじ体10に関して、図7(A)に示すように、相異なる複数の谷径D1,D2,・・・,Dnと、相異なる複数の山角度T1,T2,・・・,Tnから構成されるマトリクス条件の一部又は全部を埋めるように、複数の検証用雄ねじ体10(Tn,Dn)を準備する。
次に、対となる検証用雄ねじ体10(Tn,Dn)と、検証用雌ねじ体100(Qn,En)(以下、検証用ボルトナットセットという)をそれぞれ螺合させて締結強度試験を行う。ここでの締結強度試験は、図8に示すように、検証用雄ねじ体10(Tn,Dn)と検証用雌ねじ体100(Qn,En)を、軸方向に離れる方向(矢印A参照)に相対移動させて、締結状態(螺合状態)を強制的に解除させる引張試験を意味するが、特にこれに限定されず、繰り返し雄ねじ体100(Tn,Dn)と雌ねじ体100(Qn,En)とを相対離反させる疲労試験の他、ねじ体のトルク・軸力・回転角を検証するための所謂ねじ締付試験等であってもよく、これらの試験結果と引張試験の結果との間に相関性があることが確認されている。全ての検証用ボルトナットセットについて締結強度試験を行い、その結果が、雄ねじ体100の軸部12で破断することで締結が解除される軸破断形態となるか、ねじ山Gが変形又は崩れることで締結が解除されるねじ山崩れ形態となるかを判定する。
境界谷径抽出工程が終了した後、境界線Kの中で、前記境界谷径Dkが最大値と成り得る山角度(以下、軸破断優位山角度Tp)を選定する。図9のグラフでは、境界線Kのピーク値から、軸破断優位山角度Tpは70.5°となる。この軸破断優位山角度Tpは、軸部を極力太くして引張強度を高めたとしても、締結解除に関しては軸破断形態に導き易い山角度、即ち、山G側の剪断強度Sが最も高く成り易い山角度、と説明できる。
最後に、決定される軸破断優位山角度Tpと近似する山角度を、呼び径N16における実際の雄ねじ体10及び/又は雌ねじ体100に適用して設計を行う。例えば、実際の山角度Tを70°に設定すれば、谷径Dを大きく設定することが可能になる。具体的な谷径Dとしては、例えば14.25mm程度が好ましいことになる。
10 雄ねじ体
12 軸部
13 雄ねじ部
100 雌ねじ体
106 筒状部材
G、P ねじ山
Claims (11)
- 軸部と、
上記軸部の周面に形成され、適宜のリード角及び/又はリード方向に設定される第一螺旋溝と、
上記軸部の周面に形成され、上記リード角及び/又はリード方向に対して相異なるリード角及び/又はリード方向に設定される第二螺旋溝と、を備え、
上記第一螺旋溝と上記第二螺旋溝とが、上記軸部の軸方向における同一領域上に重畳形成されることで条状に形成されるねじ山部を有し、
上記ねじ山部は、上記軸方向に沿う断面を軸直交方向視する際において、該ねじ山の頂部から谷に向かって延在する一対の斜面の成す山角度が61°以上且つ75°以下に設定されることを特徴とする雄ねじ体。 - 前記山角度が73°以下に設定されることを特徴とする請求の範囲1に記載の雄ねじ体。
- 前記山角度が65°以上に設定されることを特徴とする請求の範囲1又は2に記載の雄ねじ体。
- 前記山角度が、70°±3°の範囲に設定されることを特徴とする請求の範囲1乃至3の何れかに記載の雄ねじ体。
- 雌ねじ部を有し、該雌ねじ部を構成する雌ねじ山部は、軸方向に沿う断面における軸直交方向視において、該雌ねじ部のねじ山の頂部から谷に向かって延在する一対の斜面の成す山角度が61°以上75°以下に設定されることを特徴とする雌ねじ体。
- 請求の範囲1乃至4のいずれかに記載の雄ねじ体と螺合可能に構成されることを特徴とする請求の範囲5に記載の雌ねじ体。
- 呼び径を一定として前記山角度及び谷径を相異ならせた複数の検証用雄ねじ体と、上記検証用雄ねじ体と螺合する複数の検証用雌ねじ体を用い、上記検証用雄ねじ体に上記検証用雌ねじ体を螺合させて軸方向に相対離反させる締結強度試験を行う場合において、上記検証用雄ねじ体が軸部で破断して締結状態が解除される軸破断形態、及び、上記検証用雄ねじ体のねじ山が変形若しくは剪断することによって締結状態が解除されるねじ山崩れ形態の双方の形態の破壊を生じさせることで、上記軸破断形態と上記ねじ山崩れ形態の境界近傍と成り得る上記谷径(以下、境界谷径と称す)について、前記山角変量に起因する変化度合いを抽出する境界谷径抽出工程と、
上記境界谷径の変化度合いに基づいて、該境界谷径が最大値と成り得る特定の前記山角度(以下、軸破断優位山角度と称す)を選定する軸破断優位山角度選定工程と、
上記軸破断優位山角度と近似する山角度を、前記呼び径における実際の前記雄ねじ体及び/又は前記雌ねじ体に適用する山角度決定工程と、
を有することを特徴とするねじ体設計方法。 - 前記境界谷径抽出工程は、
前記山角度及び前記呼び径が一定で、該谷径を相異ならせた複数の前記検証用雄ねじ体と、該検証用雄ねじ体と螺合する複数の前記検証用雌ねじ体を用い、前記検証用雄ねじ体に前記検証用雌ねじ体を螺合させて軸方向に相対離反させる締結強度試験を行う場合において、前記検証用雄ねじ体が軸部で破断して締結が解除される軸破断形態、及び、前記検証用雄ねじ体のねじ山が変形若しくは剪断することによって締結が解除されるねじ山崩れ形態の双方の形態の破壊を生じさせることで、前記軸破断形態と前記ねじ山崩れ形態の境界近傍と成り得る特定の前記谷径(以下、境界谷径と称す)を抽出する個別境界谷径抽出工程と、
互いに異なる複数の前記山角度を選定し、各山角度に基づいて、前記個別境界谷径抽出工程を繰り返し行うことで、前記山角度変量に起因する前記境界谷径の変化度合いを抽出する工程と、
を有することを特徴とする請求の範囲7のねじ体設計方法。 - 請求の範囲7又は8の前記ねじ体設計方法に基づいて設計されたものであることを特徴とする雄ねじ体。
- 請求の範囲7又は8の前記ねじ体設計方法に基づいて設計されたものであることを特徴とする雌ねじ体。
- 雄ねじ体及び/又は雌ねじ体に適用されるねじ山構造であって、該ねじ山構造におけるねじ山の頂部から谷に向かって延在する一対の斜面の成す山角度が61°以上且つ75°以下に設定されることを特徴とするねじ山構造。
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US16/094,436 US20190101151A1 (en) | 2016-04-18 | 2017-04-14 | Male screw body, female screw body, screw body design method, screw thread structure |
KR1020187029541A KR20180132693A (ko) | 2016-04-18 | 2017-04-14 | 수나사체, 암나사체, 나사체 설계 방법, 나사산 구조 |
CN201780024191.7A CN109072965A (zh) | 2016-04-18 | 2017-04-14 | 公螺纹体、母螺纹体、螺纹体设计方法、螺峰构造 |
EP17785931.1A EP3447316A4 (en) | 2016-04-18 | 2017-04-14 | EXTERNAL SCREW BODY, INTERNAL SCREW BODY, SCREW BODY CONSTRUCTION PROCEDURE, SCREW THREADED STRUCTURE |
KR1020227028408A KR102445528B1 (ko) | 2016-04-18 | 2017-04-14 | 나사체 설계 방법 |
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US11724804B2 (en) * | 2019-04-11 | 2023-08-15 | Textron Innovations Inc. | Aircraft coupling mechanism |
EP4279852B1 (de) * | 2022-05-19 | 2024-06-05 | Zehnder Group International AG | Gewindekörper |
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CN109072965A (zh) | 2018-12-21 |
TW201738467A (zh) | 2017-11-01 |
EP3447316A4 (en) | 2019-11-27 |
JP2017194079A (ja) | 2017-10-26 |
TWI737717B (zh) | 2021-09-01 |
KR102445528B1 (ko) | 2022-09-21 |
EP3447316A1 (en) | 2019-02-27 |
US20190101151A1 (en) | 2019-04-04 |
KR20180132693A (ko) | 2018-12-12 |
KR20220119526A (ko) | 2022-08-29 |
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