JP3142828U - Bolt with anti-seizure function - Google Patents
Bolt with anti-seizure function Download PDFInfo
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- JP3142828U JP3142828U JP2008002459U JP2008002459U JP3142828U JP 3142828 U JP3142828 U JP 3142828U JP 2008002459 U JP2008002459 U JP 2008002459U JP 2008002459 U JP2008002459 U JP 2008002459U JP 3142828 U JP3142828 U JP 3142828U
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Abstract
【課題】ボルトと被締結部材の組付けによるかじりや焼付きの発生率を確実に低減することができる、焼付き防止機能付きボルトを提供する。
【解決手段】ネジ部４のネジ山５は、その大部分を形成する一定高さの完全ネジ山６と、完全ネジ山６のボルト先端側に形成され徐々に高さが高くなって完全ネジ山６に連なる先端ネジ山７とを有し、先端ネジ山７は、その断面が完全ネジ山６の断面の相似形状に形成されるとともに、その先端から完全ネジ山６の先端までボルト軸心ａ回りに３０度の角度で形成され、ネジ山５が先端ネジ山７から完全ネジ山６に亙って一定ピッチで形成されている。
【選択図】図１A bolt with an anti-seizure function capable of reliably reducing the occurrence rate of galling and seizure due to the assembly of a bolt and a fastened member.
A screw thread 5 of a screw part 4 is formed with a constant height of a complete screw thread 6 that forms most of the screw thread 4 and a bolt that is formed on the tip side of the bolt of the complete screw thread 6 and gradually increases in height. A tip thread 7 that is continuous with the thread 6, and the tip thread 7 has a cross-sectional shape similar to that of the complete thread 6, and a bolt axis from the tip to the tip of the complete thread 6. The thread 5 is formed at a constant pitch from the tip thread 7 to the complete thread 6.
[Selection] Figure 1
Description
本考案は、一定高さの完全ネジ山のボルト先端側に徐々に高さが高くなって完全ネジ山に連なる先端ネジ山を形成した、焼付き防止機能付きボルトに関するものである。 The present invention relates to a bolt with a seizure-preventing function, in which a tip screw thread that is gradually increased in height and formed at the tip end side of a bolt having a constant height is connected to the complete screw thread.
従来より、ボルト・ナットの組付けによる所謂かじりや焼付きの現象は、ナット（ネジ穴中心）に対してボルト（ボルト軸心）が傾いた状態で、ボルトがナットに無理に螺合され締付けられることが原因で発生する。ここで、従来のボルトにおいて、ネジ部のネジ山が、その大部分を形成する一定高さの完全ネジ山と、この完全ネジ山のボルト先端側に形成され徐々に高さが高くなって完全ネジ山に連なる先端ネジ山とを有するものが公知である（例えば、特許文献１参照）。 Conventionally, the so-called galling and seizure phenomenon due to the bolt / nut assembly is that the bolt is forcibly screwed into the nut and tightened while the bolt (bolt axis) is tilted with respect to the nut (screw hole center). Is caused by Here, in the conventional bolt, the screw thread of the screw part is formed at a certain height of the complete thread, and the complete screw thread is formed on the tip side of the bolt and gradually increases in height. One having a tip thread continuous with the thread is known (see, for example, Patent Document 1).
このボルトによれば、ナットに対してボルトが多少傾いていても、先端ネジ山がナットのネジ穴（ネジ溝）に係合することで、ボルトをナットに螺合させ締付け可能に案内する機能を有する。しかし、先端ネジ山は一般にボルト軸心回りに１８０度〜３６０度程度の角度で形成されていることから、この先端ネジ山がボルトをナットに無理に螺合締付けさせて、かじりや焼付きの発生率を抑制できない虞がある。 According to this bolt, even if the bolt is slightly inclined with respect to the nut, the screw thread is engaged with the screw hole (thread groove) of the nut so that the bolt can be screwed into the nut and guided to be tightened Have However, since the tip thread is generally formed at an angle of about 180 to 360 degrees around the bolt axis, the tip thread forcibly tightens the bolt onto the nut to cause galling or seizure. There is a possibility that the occurrence rate cannot be suppressed.
そこで、上記課題を解消するために、特許文献１に記載のボルトでは、ネジ部のネジ山が完全ネジ山と先端ネジ山とを有するとともに、ネジ部の先端側に案内ボス部が形成され、この案内ボス部がナットのネジ穴に嵌合されると、ナットに対するボルトの傾きが大きくならないように規制され、また、先端ネジ山は、その断面が完全ネジ部の断面の相似形状に形成されるとともに、その先端から完全ネジ山の先端までボルト軸心回りに５０度〜１００度（好ましくは、９０度〜１００度）で形成されている。 Therefore, in order to solve the above problem, in the bolt described in Patent Document 1, the thread of the thread portion has a complete thread and a tip thread, and a guide boss portion is formed on the tip side of the thread portion, When this guide boss part is fitted in the screw hole of the nut, the inclination of the bolt with respect to the nut is restricted so as not to increase, and the tip thread is formed in a shape similar to the cross section of the complete screw part. At the same time, it is formed at 50 ° to 100 ° (preferably 90 ° to 100 °) around the bolt axis from the tip to the tip of the complete thread.
特許文献２に記載のボルトでは、ネジ部の完全ネジ山の先端部にボルト軸心方向と平行方向に対して１５度〜８０度で傾斜した切欠部が形成され、この完全ネジ部の切欠部に沿って高さが徐々に高くなる不完全ネジ部がボルト軸心回りに５０度未満の角度（好ましくは、１５度）で形成され、また、ネジ部の先端側に案内ボス部が形成され、この案内ボス部がナットのネジ穴に嵌合されると、ナットに対するボルトの傾きが大きくならないように規制され、案内ボス部にはネジ山と同ピッチの螺旋溝が形成されている。 In the bolt described in Patent Document 2, a notch portion that is inclined at 15 to 80 degrees with respect to the direction parallel to the axial direction of the bolt axis is formed at the tip of the complete thread of the threaded portion. An incomplete screw portion whose height gradually increases along the axis of the bolt portion is formed at an angle of less than 50 degrees (preferably 15 degrees) around the bolt axis, and a guide boss portion is formed on the tip end side of the screw portion. When the guide boss portion is fitted into the screw hole of the nut, the inclination of the bolt with respect to the nut is restricted so that the guide boss portion is formed with a spiral groove having the same pitch as the screw thread.
従来のボルトにおいて、ナットに対してボルトが多少傾いていても、ボルトをナットに螺合させ締付け可能に案内する機能を備えるために、完全ネジ山のボルト先端側に徐々に高さが高くなって完全ネジ山に連なる先端ネジ山を形成した場合、先端ネジ山のボルト軸心回りの形成角度を大きくすると、その先端ネジ山を形成するために製造コストが増大する虞がある他、先端ネジ山がボルトをナットに無理に螺合締付けさせて、かじりや焼付きの発生率を抑制できない虞がある。 In the conventional bolt, even if the bolt is slightly inclined with respect to the nut, the height is gradually increased toward the tip of the bolt of the complete thread in order to provide the function of screwing the bolt into the nut and guiding it so that it can be tightened. If the tip thread that is connected to the complete thread is formed, increasing the angle of the tip thread around the bolt axis may increase the manufacturing cost to form the tip thread. There is a possibility that the mountain cannot force the bolts and nuts to be screwed in and suppress the occurrence rate of galling or seizure.
そこで、特許文献１に記載のボルトのように、先端ネジ山のボルト軸心回りの形成角度を一般的な角度（１８０度〜３６０度程度）よりも小さな角度（特許文献１では、５０度〜１００度）にすることが考えられるが、図９に示すように、実施例に係るボルト締付け試験により、先端ネジ山のボルト軸心回りの形成角度を９０度にしたボルトでは、ナットに対するボルトの傾斜角度（７度〜１０度）（以下、傾斜角度という）によっては、焼付きが発生し、その発生率も望むように低く抑えることができない、という結果を得た。 Therefore, like the bolt described in Patent Document 1, the angle formed around the bolt axis of the tip thread is smaller than a general angle (about 180 degrees to 360 degrees) (in Patent Document 1, 50 degrees to However, as shown in FIG. 9, in the bolt tightening test according to the example, in the bolt in which the formation angle around the bolt axis of the tip thread is 90 degrees, Depending on the inclination angle (7 to 10 degrees) (hereinafter referred to as the inclination angle), seizure occurred, and the occurrence rate could not be kept as low as desired.
ここで、傾斜角度を大きくすると、ボルトが空転する割合が高くなり、先端ネジ山のボルト軸心回りの形成角度を９０度にしたボルトでも、図８に示すように、傾斜角度が８度の場合にボルトが空転する割合が２０％になり、傾斜角度が１０度の場合にボルトが空転する割合が６０％になるが、そこでボルトが空転したとしても、ボルト空転状態のまま傾斜角度を小さくしていくと、その傾斜角度が７度〜９度になったところで、焼付きが発生する可能性がある。 Here, when the inclination angle is increased, the rate at which the bolt rotates idly increases, and even with a bolt in which the formation angle around the bolt axis of the tip thread is 90 degrees, the inclination angle is 8 degrees as shown in FIG. In this case, the ratio of the idling of the bolt is 20%, and when the inclination angle is 10 degrees, the ratio of the idling of the bolt is 60%. As a result, seizure may occur when the inclination angle becomes 7 degrees to 9 degrees.
尚、特許文献１に記載のボルトでは、先端ネジ山のボルト軸心回りの形成角度を５０度〜１００度にするとともに、ネジ部の先端側に案内ボス部を形成し、この案内ボス部をナットのネジ穴に嵌合させて、ナットに対するボルトの傾きが大きくならないように規制しているが、案内ボス部を設ける分、ボルトが大型化し製造コストが増大する。 In addition, in the bolt described in Patent Document 1, the angle of formation around the bolt axis of the tip thread is set to 50 degrees to 100 degrees, a guide boss is formed on the tip side of the thread, and the guide boss is Although it is regulated so that the inclination of the bolt with respect to the nut does not increase by being fitted into the screw hole of the nut, the bolt is enlarged and the manufacturing cost is increased by providing the guide boss portion.
特許文献２に記載のボルトでは、ネジ部の完全ネジ山の先端部にボルト軸心方向と平行方向に対して傾斜した切欠部を形成する必要があるため、製造コストが増大し、また、不完全ネジ部の断面が完全ネジ部の断面と相似形状ではく、切欠部によりボルト・ナットが螺合し易くなることから、かじりや焼付きが発生する虞がある傾斜角度では、ボルト・ナットが不適切に螺合して締付けられ、即ち、かじりや焼付きの発生率が高くなる可能性がある。 In the bolt described in Patent Document 2, it is necessary to form a notch portion that is inclined with respect to the direction parallel to the axial direction of the bolt at the tip of the complete screw thread of the screw portion. The cross section of the complete thread portion is not similar to the cross section of the complete thread portion, and the bolts and nuts are easy to be screwed together by the cutouts. There is a possibility that the occurrence rate of galling and seizure increases.
本考案の目的は、ボルトと被締結部材の組付けによるかじりや焼付きの発生率を確実に低減し、そのために、被締結部材に対するボルトの傾斜角度が所定角度を境に切換わることで、かじりや焼付きの発生を極力抑制して、ボルトを被締結部材に適切に螺合させ締付けできる動作状態と空転させる動作状態とに切換わり、ボルト空転時には、ボルトと被締結部材の損傷を抑えるとともに、組付け作業者がボルト空転状態を知り、ボルト空転状態のまま傾斜角度を所定角度よりも小さく修正することで、ボルトを被締結部材に適切に螺合させ締付けることができる、焼付き防止機能付きボルトを提供することである。 The purpose of the present invention is to reliably reduce the occurrence rate of galling and seizure due to the assembly of the bolt and the fastened member, and for that purpose, the inclination angle of the bolt with respect to the fastened member is switched at the predetermined angle, Suppress the occurrence of galling and seizure as much as possible, and switch between the operating state in which the bolt can be properly screwed into the tightened member and tightened, and the operating state in which the bolt is idled, and during the idling of the bolt, damage to the bolt and the to-be-fastened member is suppressed. At the same time, the assembly operator knows the bolt idling state and corrects the tilt angle to be smaller than the predetermined angle while the bolt idling state, so that the bolt can be properly screwed into the fastening member and tightened to prevent seizure. It is to provide a bolt with a function.
請求項１の焼付き防止機能付きボルトは、被締結部材のネジ穴に螺合されるネジ部を有するものであり、前記ネジ部のネジ山が、その大部分を形成する一定高さの完全ネジ山と、この完全ネジ山のボルト先端側に形成され徐々に高さが高くなって完全ネジ山に連なる先端ネジ山とを有し、前記先端ネジ山は、その断面が完全ネジ山の断面の相似形状に形成されるとともに、その先端から完全ネジ山の先端までボルト軸心回りに１０度以上５０度未満の角度で形成されたことを特徴とする。 The bolt with an anti-seizure function according to claim 1 has a screw portion that is screwed into a screw hole of a member to be fastened, and the screw thread of the screw portion is a constant height that forms most of the screw portion. A screw thread and a tip thread formed on the bolt tip side of the complete thread and gradually increasing in height and continuing to the complete thread, the tip thread having a cross section of the complete thread It is characterized by being formed at an angle of not less than 10 degrees and less than 50 degrees around the axis of the bolt from its tip to the tip of the complete thread.
請求項２の焼付き防止機能付きボルトは、請求項１の考案において、前記先端ネジ山がボルト軸心回りに２５度〜３５度の角度で形成されたことを特徴とし、請求項３の焼付き防止機能付きボルトは、請求項１又は２の考案において、前記ネジ山が先端ネジ山から完全ネジ山に亙って一定ピッチで形成されたことを特徴とする。 The bolt with anti-seizure function according to claim 2 is characterized in that, in the device according to claim 1, the tip thread is formed at an angle of 25 to 35 degrees around the bolt axis. The bolt with an anti-stick function according to claim 1 or 2, wherein the screw thread is formed at a constant pitch from the tip thread to the complete thread.
請求項１の焼付き防止機能付きボルトによれば、被締結部材のネジ穴に螺合されるネジ部を有し、ネジ部のネジ山が、その大部分を形成する一定高さの完全ネジ山と、この完全ネジ山のボルト先端側に形成され徐々に高さが高くなって完全ネジ山に連なる先端ネジ山とを有し、先端ネジ山を、その断面が完全ネジ山の断面の相似形状に形成するとともに、その先端から完全ネジ山の先端までボルト軸心回りに１０度以上５０度未満の角度で形成したので、ボルトと被締結部材の組付けによる焼付きの発生率を確実に低減することができ、そのために、被締結部材に対するボルトの傾斜角度が所定角度を境に切換わることで、焼付きの発生を極力抑制して、ボルトを被締結部材に適切に螺合させ締付けできる動作状態と空転させる動作状態とが切換わるようにすることができ、故に、ボルト空転時には、ボルトと被締結部材の損傷を抑えるとともに、組付け作業者がボルト空転状態を知り、ボルト空転状態のまま傾斜角度を所定角度よりも小さく修正することで、ボルトを被締結部材に適切に螺合させ締付けることができる。 According to the bolt with a seizure prevention function according to claim 1, the screw has a screw portion that is screwed into the screw hole of the member to be fastened, and the screw thread of the screw portion forms a large part of the complete screw with a constant height. And a tip thread formed on the tip side of the bolt of this complete thread that gradually increases in height and continues to the complete thread. The tip thread is similar to the section of the complete thread. Since it is formed into a shape and formed at an angle of 10 degrees or more and less than 50 degrees around the bolt axis from the tip to the tip of the complete thread, the occurrence rate of seizure due to the assembly of the bolt and the fastening member is ensured. For this purpose, the inclination angle of the bolt with respect to the member to be fastened is switched from the predetermined angle as a boundary to suppress the occurrence of seizure as much as possible, and the bolt is properly screwed to the member to be fastened and tightened. The operation state that can be Therefore, at the time of idling of the bolt, the damage of the bolt and the member to be fastened is suppressed, and the assembly operator knows the idling condition of the bolt and corrects the tilt angle to be smaller than the predetermined angle while the idling condition of the bolt is kept. By doing so, the bolt can be appropriately screwed to the fastened member and tightened.
請求項２の焼付き防止機能付きボルトによれば、先端ネジ山をボルト軸心回りに２５度〜３５度の角度で形成したので、傾斜角度が所定角度（例えば、８度）を境に切換わることで、焼付きの発生を無くして、ボルトを被締結部材に適切に螺合させ締付けできる動作状態と空転させる動作状態とに切換わるようにすることができ、焼付きの発生率を著しく低減することができる。 According to the bolt with anti-seizure function of claim 2, since the tip thread is formed at an angle of 25 to 35 degrees around the bolt axis, the inclination angle is cut at a predetermined angle (for example, 8 degrees). In other words, the seizure can be eliminated, and the bolt can be properly screwed onto the tightened member to be switched between an operating state in which the bolt can be fastened and an operating state in which the bolt is idled. Can be reduced.
請求項３の焼付き防止機能付きボルトは、ネジ山を先端ネジ山から完全ネジ山に亙って一定ピッチで形成したので、ボルトと被締結部材の組付けによる焼付きと共にかじりの発生率を確実に低減することができる。 Since the bolt with the seizure prevention function according to claim 3 is formed at a constant pitch from the tip thread to the complete thread, the seizure rate due to the seizure caused by the assembly of the bolt and the fastening member is reduced. It can be surely reduced.
本考案の焼付き防止機能付きボルトは、被締結部材のネジ穴に螺合されるネジ部を有し、ネジ部のネジ山が、その大部分を形成する一定高さの完全ネジ山と、この完全ネジ山のボルト先端側に形成され徐々に高さが高くなって完全ネジ山に連なる先端ネジ山とを有し、先端ネジ山は、その断面が完全ネジ山の断面の相似形状に形成されるとともに、その先端から完全ネジ山の先端までボルト軸心回りに１０度以上５０度未満の角度で形成されている。 The bolt with an anti-seizure function of the present invention has a screw portion that is screwed into the screw hole of the member to be fastened, and the screw thread of the screw portion forms a large part of the complete screw thread of a certain height, This complete thread has a tip thread that is formed on the bolt end side and gradually increases in height and continues to the complete thread, and the tip thread has a cross-sectional shape similar to that of the complete thread. At the same time, it is formed at an angle of 10 degrees or more and less than 50 degrees around the bolt axis from the tip to the tip of the complete thread.
図１〜図４に示すように、焼付き防止機能付きボルト１は、ボルト頭部２とボルト軸部３とからなり、ボルト軸部３に被締結部材である例えばナット１０（図７参照）のネジ穴１１に螺合されるネジ部４が形成され、ネジ部４のネジ山５は、その大部分を形成する一定高さの完全ネジ山６と、完全ネジ山６のボルト先端側に形成され徐々に高さが高くなって完全ネジ山６に連なる先端ネジ山７とを有する。 As shown in FIGS. 1 to 4, the bolt 1 with an anti-seizure function includes a bolt head 2 and a bolt shaft portion 3, and is a member to be fastened to the bolt shaft portion 3, for example, a nut 10 (see FIG. 7). A screw part 4 to be screwed into the screw hole 11 is formed. A screw thread 5 of the screw part 4 is formed on a complete screw thread 6 of a fixed height that forms most of the screw part 4 and a bolt tip side of the screw thread 6. It has a tip thread 7 that is formed and gradually increases in height and continues to the complete thread 6.
先端ネジ山７は、その断面（略２等辺三角形の断面）が完全ネジ山６の断面（略２等辺三角形の断面）の相似形状に形成されるとともに、その先端から完全ネジ山６の先端までボルト軸心ａ回りに３０度の角度で形成され、ネジ山５が先端ネジ山７から完全ネジ山６に亙って一定ピッチＰ１で形成されている。 The tip thread 7 has a cross-section (substantially isosceles triangle cross-section) similar in shape to the cross-section (substantially isosceles triangle cross-section) of the complete thread 6 and from the tip to the tip of the complete thread 6. The screw thread 5 is formed around the bolt axis a at an angle of 30 degrees, and is formed at a constant pitch P 1 from the tip thread thread 7 to the complete thread thread 6.
ここで、本願考案者は、図７に示すように、前記の焼付き防止機能付きボルト１を用いて、そのボルト１とナット１０を組付ける際、ナット１０のネジ穴中心ｂに対するボルト１のボルト軸心ａの傾斜角度（以下、単に傾斜角度という）を５度〜１０度まで１度ずつ変えて、その各傾斜角度においてボルト１をナット１０に締付けるようにする、ボルト締付け試験を行った。また、本考案の焼付き防止機能付きボルト１と比較するために、従来のボルト１００を用いて、前記同様のボルト締付け試験を行った。 Here, as shown in FIG. 7, the inventor of the present application uses the bolt 1 with seizure prevention function to assemble the bolt 1 and the nut 10 with the bolt 1 with respect to the screw hole center b of the nut 10. A bolt tightening test was performed in which the tilt angle of the bolt axis a (hereinafter simply referred to as the tilt angle) was changed by 1 degree from 5 degrees to 10 degrees, and the bolt 1 was tightened to the nut 10 at each tilt angle. . Moreover, in order to compare with the bolt 1 with a seizure prevention function of the present invention, a bolt tightening test similar to the above was performed using a conventional bolt 100.
その従来のボルト１００は、ネジ部１０４のネジ山１０５が完全ネジ山１０６と先端ネジ山１０７とを有し、先端ネジ山１０７は、その断面が完全ネジ山１０６の断面の相似形状に形成されるとともに、その先端から完全ネジ山１０６の先端までボルト軸心ａ回りに９０度の角度で形成され、ネジ山１０５が先端ネジ山１０７から完全ネジ山１０６に亙って一定ピッチＰ１で形成されたものであり、本考案の焼付き防止機能付きボルト１に対して、その先端ネジ山７のみを変更したものである。 In the conventional bolt 100, the thread 105 of the threaded portion 104 has a complete thread 106 and a tip thread 107, and the tip thread 107 has a cross-sectional shape similar to that of the complete thread 106. In addition, from the tip of the screw thread 106 to the tip of the complete screw thread 106 is formed at an angle of 90 degrees around the bolt axis a, and the screw thread 105 is formed from the tip screw thread 107 to the complete screw thread 106 at a constant pitch P1. In the present invention, only the tip thread 7 is changed with respect to the bolt 1 with a seizure prevention function of the present invention.
ボルト締付け試験は、所定のボルト・ナット組付け装置（図示略）を用いて、固定されたナット１０に対して、そのナット１０のネジ穴中心ｂとボルト１，１００の先端部のボルト軸心ａの位置とを略一致させた状態で、ボルト１，１００をボルト軸心ａ回りに回転させて押付けるようにして行い、その試験条件として、推力（押し付け力）を６１Ｎ、せり力（ボルト１，１００がそのボルト軸心ａをナット１０のネジ穴中心ｂと一致させる側に起き上がる力に対抗する最大抗力）を０．７Ｎ・ｍ、５度〜１０度の各傾斜角度に対するボルト１，１００の各々のサンプル数を１０として行った。 The bolt tightening test is performed by using a predetermined bolt / nut assembly device (not shown) and fixing the nut 10 to the screw hole center b of the nut 10 and the bolt axis at the tip of the bolt 1100. The bolts 1 and 100 are rotated around the bolt axis a and pressed in a state where the position of “a” is substantially matched. As test conditions, the thrust (pressing force) is 61 N, and the thrust force (bolt 1,100 is the maximum drag force against the force that rises to the side where the bolt axis a coincides with the screw hole center b of the nut 10). The number of samples in each of 100 was set to 10.
先ず、従来のボルト１００を用いて行ったボルト締付け試験の結果、図９に示すように、傾斜角度が５度と６度の場合、ボルト１００をナット１０に適切に螺合させ締付けることができた成功率が１００％になった。しかし、傾斜角度が７度〜１０度の場合、ボルト１００がナット１０に無理に螺合され締付けられることに原因がある焼付きが発生し、その焼付き発生率は、傾斜角度が７度と８度の場合に２０％、傾斜角度が９度の場合に８０％、傾斜角度が１０度の場合に４０％に達した。 First, as a result of the bolt tightening test performed using the conventional bolt 100, as shown in FIG. 9, when the inclination angle is 5 degrees and 6 degrees, the bolt 100 can be appropriately screwed into the nut 10 and tightened. The success rate reached 100%. However, when the inclination angle is 7 to 10 degrees, seizure occurs due to the bolt 100 being forcibly screwed into the nut 10 and tightened, and the seizure occurrence rate is 7 degrees. It reached 20% when it was 8 degrees, 80% when the inclination angle was 9 degrees, and 40% when the inclination angle was 10 degrees.
また、傾斜角度が８度と１０度の場合、ボルト１００がナット１０に螺合されずに空転し、その空転率は、傾斜角度が８度の場合に１０％、傾斜角度が１０度の場合に６０％になった。尚、傾斜角度が１１％以上の場合、成功率は０で、焼付き発生率は低下し、空転率は上昇すると推測できる。 Further, when the inclination angle is 8 degrees and 10 degrees, the bolt 100 is idled without being screwed to the nut 10, and the idling rate is 10% when the inclination angle is 8 degrees, and the inclination angle is 10 degrees. 60%. When the inclination angle is 11% or more, it can be estimated that the success rate is 0, the seizure occurrence rate decreases, and the idling rate increases.
このボルト締付け試験の結果から判るように、先端ネジ山１０７のボルト軸心ａ回りの形成角度を９０度にしたボルト１００では、傾斜角度が７度〜１０度の場合、焼付きが発生し、その発生率も望むように低く抑えることができない。 As can be seen from the results of the bolt tightening test, in the bolt 100 in which the formation angle of the tip thread 107 around the bolt axis a is 90 degrees, seizure occurs when the inclination angle is 7 degrees to 10 degrees, The incidence cannot be kept as low as desired.
傾斜角度を大きくすると、ボルト１００が空転する割合が高くなり、前記のように、傾斜角度が８度の場合にボルトが空転する割合が２０％になり、傾斜角度が１０度の場合にボルトが空転する割合が６０％になるが、そこでボルト１００が空転したとしても、ボルト空転状態のまま傾斜角度を小さくしていくと、その傾斜角度が７度〜９度になったところで、焼付きが発生する可能性がある。 Increasing the inclination angle increases the rate at which the bolt 100 idles, and as described above, the rate at which the bolt idles when the inclination angle is 8 degrees is 20%, and the bolt rotates when the inclination angle is 10 degrees. Although the idling ratio is 60%, even if the bolt 100 is idling there, if the tilt angle is reduced while the bolt is idling, seizure occurs when the tilt angle becomes 7 to 9 degrees. May occur.
一方、本考案の焼付き防止機能付きボルト１を用いて行ったボルト締付け試験の結果、図８に示すように、傾斜角度が５度〜７度の場合、ボルト１をナット１０に適切に螺合させ締付けることができた成功率が１００％になり、傾斜角度が９度と１０度の場合、ボルト１がナット１０に螺合されずに空転する空転率が１００％になり、傾斜角度が１１％以上の場合の空転率も１００％になると推測でき、また、傾斜角度が８度の場合、成功率が５０％になり、空転率が５０％になった。 On the other hand, as a result of the bolt tightening test performed using the bolt 1 with seizure prevention function of the present invention, as shown in FIG. 8, when the inclination angle is 5 degrees to 7 degrees, the bolt 1 is appropriately screwed onto the nut 10. When the success rate that can be tightened together is 100% and the inclination angle is 9 degrees and 10 degrees, the idle rotation ratio that the bolt 1 is idled without being screwed to the nut 10 is 100%, and the inclination angle is It can be estimated that the idling rate in the case of 11% or more is 100%, and when the tilt angle is 8 degrees, the success rate is 50% and the idling rate is 50%.
このボルト締付け試験の結果から判るように、先端ネジ山７のボルト軸心ａ回りの形成角度を３０度にした焼付き防止機能付きボルト１の場合、傾斜角度に関わらず、焼付きの発生が無くなり、傾斜角度が７度の場合に従来のボルト１と比べて成功率が上昇した。 As can be seen from the results of this bolt tightening test, in the case of the bolt 1 with a seizure prevention function in which the forming angle of the tip thread 7 around the bolt axis a is 30 degrees, seizure occurs regardless of the inclination angle. The success rate increased compared to the conventional bolt 1 when the inclination angle was 7 degrees.
このように、焼付き防止機能付きボルト１によれば、先端ネジ山７を、その断面が完全ネジ山６の断面の相似形状に形成するとともに、その先端から完全ネジ山６の先端までボルト軸心ａ回りに１０度以上５０度未満の角度（３０度）で形成したので、ボルト１とナット１０の組付けによる焼付きの発生率を確実に低減することができ、そのために、ナット１０に対するボルト１の傾斜角度が所定角度を境に切換わることで、焼付きの発生を極力抑制して、ボルト１をナット１０に適切に螺合させ締付けできる動作状態と空転させる動作状態とに切換わるようにすることができ、故に、ボルト１の空転時には、ボルト１とナット１０の損傷を抑えるとともに、組付け作業者がボルト１の空転状態を知り、ボルト１の空転状態のまま傾斜角度を所定角度（８度）よりも小さく修正することで、ボルト１をナット１０に適切に螺合させ締付けることができる。 As described above, according to the bolt 1 with the seizure prevention function, the tip thread 7 is formed to have a cross-sectional shape similar to that of the complete thread 6, and the bolt shaft from the tip to the tip of the complete thread 6. Since it is formed at an angle (30 degrees) of 10 degrees or more and less than 50 degrees around the center a, the occurrence rate of seizure due to the assembly of the bolt 1 and the nut 10 can be surely reduced. By switching the inclination angle of the bolt 1 at a predetermined angle, the occurrence of seizure is suppressed as much as possible, and the operation state is switched between the operation state in which the bolt 1 can be appropriately screwed into the nut 10 and tightened and the operation state in which the bolt 1 is idled. Therefore, when the bolt 1 is idling, the damage of the bolt 1 and the nut 10 is suppressed, and the assembling operator knows the idling state of the bolt 1, and the tilt angle is kept in the idling state of the bolt 1. By modifying smaller than the constant angle (8 degrees), the bolt 1 can be tightened properly so screwed into the nut 10.
特に、先端ネジ山６をボルト軸心ａ回りに２５度〜３５度の３０度の角度で形成したので、傾斜角度が８度を境に切換わることで、ボルト１とナット１０の焼付きの発生を無くして、ボルト１をナット１０に適切に螺合させ締付けできる動作状態と空転させる動作状態とに切換わるようにすることができ、ボルト１とナット１０の組付けによる焼付きの発生率を著しく低減することができ、更に、ネジ山５が先端ネジ山７から完全ネジ山６に亙って一定ピッチＰ１で形成されたので、ボルト１とナット１０の組付けによる焼付きと共にかじりの発生率を確実に低減することができる。 In particular, since the tip thread 6 is formed at an angle of 30 degrees from 25 to 35 degrees around the bolt axis a, the bolt 1 and the nut 10 are seized by switching the inclination angle at 8 degrees. The occurrence of seizure can be switched between an operation state in which the bolt 1 can be appropriately screwed and tightened to the nut 10 and an operation state in which the bolt 1 is idled. Further, since the screw thread 5 is formed at a constant pitch P1 from the tip screw thread 7 to the complete screw thread 6, the seizure of the screw 1 and the nut 10 can be reduced. The occurrence rate can be reliably reduced.
ここで、先端ネジ山６のボルト軸心ａ回りの形成角度を、２５度〜３５度の３０度以外の角度として、先端ネジ山６のボルト軸心ａ回りの形成角度が３０度の場合の効果と同様の効果を期待できる。また、先端ネジ山６のボルト軸心ａ回りの形成角度を、１０度〜２５度の角度、或いは、３５度〜５０度の角度として、先端ネジ山６のボルト軸心ａ回りの形成角度が３０度の場合の効果と類する効果を期待できる。 Here, when the formation angle around the bolt axis a of the tip thread 6 is an angle other than 30 degrees of 25 to 35 degrees, the formation angle around the bolt axis a of the tip thread 6 is 30 degrees. The same effect as the effect can be expected. Further, the formation angle of the tip screw thread 6 around the bolt axis a is set to an angle of 10 degrees to 25 degrees, or an angle of 35 degrees to 50 degrees, and the formation angle of the tip screw thread 6 around the bolt axis a is The effect similar to the effect in the case of 30 degrees can be expected.
その他、本考案の趣旨を逸脱しない範囲において、種々の構成を採用可能である。例えば、図示省略するが、焼付き防止機能付きボルト１において、ネジ部５の先端側に先端軸部を形成し、この先端軸部がナットのネジ穴に嵌合されることで、ナットに対するボルトの傾きが大きくならないように規制するようにしてもよい。そして、本考案については、種々のボルトに適用可能であり、また、本考案のボルトが螺合される被締結部材としてナットに限らず種々の被締結部材としてもよい。 In addition, various configurations can be employed without departing from the spirit of the present invention. For example, although not shown in the drawings, in the bolt 1 with a seizure prevention function, a tip shaft portion is formed on the tip end side of the screw portion 5, and the tip shaft portion is fitted into the screw hole of the nut, so that the bolt to the nut You may make it regulate so that inclination of may not become large. The present invention can be applied to various bolts, and the member to be fastened to which the bolt of the present invention is screwed is not limited to a nut but may be various members to be fastened.
１ 焼付き防止機能付きボルト
４ ネジ部
５ ネジ山
６ 完全ネジ山
７ 先端ネジ山
１０ ナット
１１ ネジ穴
1 Bolt with anti-seizure function 4 Thread part 5 Thread 6 Complete thread 7 Tip thread 10 Nut 11 Screw hole
Claims (3)
前記ネジ部のネジ山が、その大部分を形成する一定高さの完全ネジ山と、この完全ネジ山のボルト先端側に形成され徐々に高さが高くなって完全ネジ山に連なる先端ネジ山とを有し、
前記先端ネジ山は、その断面が完全ネジ山の断面の相似形状に形成されるとともに、その先端から完全ネジ山の先端までボルト軸心回りに１０度以上５０度未満の角度で形成されたことを特徴とする焼付き防止機能付きボルト。 In the bolt with an anti-seizure function having a screw part screwed into the screw hole of the fastened member,
The screw thread of the screw part is a complete screw thread of a certain height that forms most of the thread part, and a tip screw thread that is formed on the bolt tip side of this complete screw thread and gradually increases in height and continues to the complete screw thread And
The tip thread has a cross section formed in a shape similar to that of the full thread, and is formed at an angle of 10 degrees or more and less than 50 degrees around the bolt axis from the tip to the tip of the complete thread. Bolt with anti-seizure function characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008002459U JP3142828U (en) | 2008-04-17 | 2008-04-17 | Bolt with anti-seizure function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008002459U JP3142828U (en) | 2008-04-17 | 2008-04-17 | Bolt with anti-seizure function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP3142828U true JP3142828U (en) | 2008-06-26 |
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ID=43292809
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008002459U Expired - Lifetime JP3142828U (en) | 2008-04-17 | 2008-04-17 | Bolt with anti-seizure function |
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| Country | Link |
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| JP (1) | JP3142828U (en) |
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2008
- 2008-04-17 JP JP2008002459U patent/JP3142828U/en not_active Expired - Lifetime
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