JP2010053976A - Bolt fastening structure - Google Patents

Bolt fastening structure Download PDF

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JP2010053976A
JP2010053976A JP2008220343A JP2008220343A JP2010053976A JP 2010053976 A JP2010053976 A JP 2010053976A JP 2008220343 A JP2008220343 A JP 2008220343A JP 2008220343 A JP2008220343 A JP 2008220343A JP 2010053976 A JP2010053976 A JP 2010053976A
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bolt
cylindrical member
fastening
fastening structure
screw portion
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Kenjiro Narita
健次郎 成田
Haruyuki Yamazaki
晴幸 山崎
Hiroyuki Doi
裕之 土井
Kazu Kobayashi
計 小林
Hajime Toritani
初 鳥谷
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Hitachi Ltd
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To downsize a fastening structure of a fastening member which stores high-temperature fluid at relatively low cost; to provide the bolt fastening structure capable of securely preventing leakage of the high-temperature fluid inside the fastening member. <P>SOLUTION: The structure comprises: a bolt 4 formed with a male screw part 4a at the axial edge; a cylindrical member 5 formed with a female screw part 5b screwed with the male screw part 4a of the bolt 4 and formed with a male screw part 5a on its outer periphery; a fastening member 3 formed with a female screw part 3b screwed with the male screw part 5a of the cylindrical member 5; and a fastened member 2 positioned between the bolt 4 and the fastening member 3 and equipped with a hole 2a penetrated by the bolt 4. The fastening member 3 is provided with a cylindrical member receiving part 8 which can fix a depth-direction position of the cylindrical member 5. The bolt 4 and the cylindrical member 5 are composed of members having higher strength compared with the fastening member 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、高温流体を収納する容器のフランジ及び蓋のボルト締結構造に係り、特に、高温流体を収納するタービンケーシングや弁などのフランジ及び蓋のボルト締結構造に関する。   The present invention relates to a bolt fastening structure for a flange and a lid of a container that stores a high-temperature fluid, and more particularly to a bolt fastening structure for a flange and a lid such as a turbine casing and a valve that store a high-temperature fluid.

一般に、その内部に高温の流体を収納する蒸気タービン用の弁においては、フランジや蓋をボルト締結することが行われている。図８に蒸気タービン用の蒸気加減弁の一例を示す。図８において、弁の本体２３に弁蓋２２をボルト２４で締結することにより、圧力容器としての加減弁のケーシング２１が形成されている。このケーシング２１内には、弁棒３１を介して弁座３２に対して接離される弁部３３が配設され、弁部３３の外周部に蒸気中の異物を留めるストレーナ３４が設けられている。   In general, in a steam turbine valve that stores a high-temperature fluid therein, a flange or a lid is bolted. FIG. 8 shows an example of a steam control valve for a steam turbine. In FIG. 8, a valve lid 22 is fastened to a valve main body 23 with a bolt 24, thereby forming an adjustable valve casing 21 as a pressure vessel. In the casing 21, a valve portion 33 that is brought into contact with and separated from the valve seat 32 via a valve rod 31 is disposed, and a strainer 34 that holds foreign matter in the steam is provided on the outer peripheral portion of the valve portion 33. .

このボルト締結は、蒸気などの高温流体の漏出を防ぐために、十分な締付け力が必要となり、各ボルト２４には強い引張り力を発生させて、その反作用により被締結体である弁蓋２２を締付けている。   This bolt fastening requires a sufficient tightening force to prevent leakage of a high-temperature fluid such as steam. A strong tensile force is generated in each bolt 24, and the valve lid 22 which is a member to be fastened is tightened by the reaction. ing.

ところで、蒸気タービンの運転時には、弁本体が高温状態に変移するため、各ボルトには、さらに強い引張り力が発生する。このため、一般に、大径のボルトが使用され、発生応力を低く保つことによって締結強度を確保している。このように、大径のボルトと組み合うフランジや蓋からなる大型の締結構造体が多く使用されている。   By the way, during operation of the steam turbine, the valve main body changes to a high temperature state, and thus a stronger tensile force is generated in each bolt. For this reason, generally, a large-diameter bolt is used, and the fastening strength is secured by keeping the generated stress low. As described above, a large-sized fastening structure including a flange and a lid combined with a large-diameter bolt is often used.

このようなボルト締結構造体において、耐熱合金材など高温で高い強度を有する材料を用いれば小規模でコンパクトな締結構造体が可能となるが、耐熱合金材などは一般に高価格であり、全ての部材を耐熱合金材とすれば高コストとなるため、特殊な用途を除いて実用化は難しい。   In such a bolt fastening structure, if a material having high strength at high temperature such as a heat-resistant alloy material is used, a small-scale and compact fastening structure is possible. However, heat-resistant alloy materials are generally expensive and all If the member is made of a heat-resistant alloy material, the cost becomes high, and it is difficult to put it into practical use except for special applications.

一方、水平分割型のガスタービンケーシングの締結構造において、十分に大きなケーシング締め付け力を維持しながら大径のボルトを使用せずにコンパクト化した例として、上側ケーシング内に壁面接線方向にボルト孔を形成し、下側ケーシングとの接合面近傍内周に内ねじを有するねじ穴を設け、ボルト孔下部には外周に内ねじと螺合する外ねじを設けた高強度材料からなる円筒状スリーブを装着し、高強度材料からなる締結ボルトには、先端の締結用ねじ部を下側ケーシングの締結用ねじ部に螺合させたときに、スリーブ上端面と当接する大径部を形成したものがある。（例えば、特許文献１参照。）。   On the other hand, in the fastening structure of the horizontal split type gas turbine casing, as an example of compacting without using a large-diameter bolt while maintaining a sufficiently large casing tightening force, a bolt hole in the tangential direction of the wall surface is formed in the upper casing. A cylindrical sleeve made of a high-strength material is formed and provided with a screw hole having an inner screw in the inner periphery in the vicinity of the joint surface with the lower casing, and an outer screw that is screwed into the outer periphery on the outer periphery of the bolt hole. A fastening bolt made of a high-strength material is formed with a large diameter portion that comes into contact with the upper end surface of the sleeve when the fastening screw portion at the tip is screwed into the fastening screw portion of the lower casing. is there. (For example, refer to Patent Document 1).

この締結構造においては、ボルトの大径部とスリーブ上端との接触面圧を大きく取ることができるため、大径のボルトを使用せずに、高温状態でのケーシング締め付け力を維持することができる。   In this fastening structure, since the contact surface pressure between the large diameter portion of the bolt and the upper end of the sleeve can be increased, the casing tightening force at a high temperature can be maintained without using a large diameter bolt. .

特開２００１−１０７９２２号公報JP 2001-107922 A

例えば、蒸気タービン用の弁における蓋と弁本体とをボルト締結する場合、次のような締結構造を採用することによりコンパクト化が図れる。   For example, when the lid and the valve body of the steam turbine valve are bolted together, a compact structure can be achieved by adopting the following fastening structure.

図７に蒸気タービン用の弁におけるボルト締結構造の一例を示す。図７の（ａ）において、蒸気タービン用の弁におけるボルト締結構造は、締結部材である弁本体３に、高強度部材からなるボルト４の雄ねじ部４ａよりも径大な雌ねじ部３ｂを形成し、この雌ねじ部３ｂに外周を雄ねじ部５ａとした高強度部材からなる円筒部材５を、弁本体３の外側から螺合してセットし、ボルト４を被締結部材である弁蓋２の貫通孔２ａを通じて、円筒部材５の雌ねじ部５ｂに螺合し、締め付けて、図７の（ｂ）に示すように、円筒部材５と弁本体３、及び、ボルト４と円筒部材５の各ねじ結合力によって、弁本体３と弁蓋２とをボルト締結する。   FIG. 7 shows an example of a bolt fastening structure in a steam turbine valve. In FIG. 7A, the bolt fastening structure in the steam turbine valve is formed by forming a female screw portion 3b having a diameter larger than the male screw portion 4a of the bolt 4 made of a high-strength member in the valve body 3 which is a fastening member. The cylindrical member 5 made of a high-strength member whose outer periphery is a male screw portion 5a is set to the female screw portion 3b by screwing from the outside of the valve body 3, and the bolt 4 is a through-hole of the valve lid 2 which is a member to be fastened. The screw coupling force of the cylindrical member 5 and the valve main body 3, and the bolt 4 and the cylindrical member 5, as shown in FIG. Thus, the valve body 3 and the valve lid 2 are bolted.

この締結構造によれば、弁本体３の雌ねじ部３ｂはボルト４の雄ねじ部４ａよりも径大であり、そのため、雌ねじ部３ｂの螺旋方向におけるねじ長さが長く確保される。このことは、高強度部材でない弁本体３の雌ねじ部３ｂのねじ山の応力を低くすることになる。それゆえ、円筒部材５と弁本体３とのねじ結合部の耐力を大きく確保し得えて、円筒部材５についても、弁本体３に対しねじ抜けしにくいしっかりした螺合状態を得られる。したがって、蒸気タービンの運転時等の高温状態にあっても、大径のボルトを使用せずに、弁本体３と弁蓋２とを、しっかりした締結状態にすることができる。   According to this fastening structure, the female thread portion 3b of the valve main body 3 has a larger diameter than the male thread portion 4a of the bolt 4, and thus the screw length in the spiral direction of the female thread portion 3b is ensured to be long. This lowers the stress of the thread of the female thread portion 3b of the valve body 3 that is not a high-strength member. Therefore, it is possible to ensure a large proof strength of the screw coupling portion between the cylindrical member 5 and the valve main body 3, and it is possible to obtain a firm screwed state in which the cylindrical member 5 is difficult to be screwed out with respect to the valve main body 3. Therefore, even when the steam turbine is in a high temperature state such as during operation, the valve body 3 and the valve lid 2 can be firmly fastened without using a large-diameter bolt.

しかしながら、上記の締結構造は、以下の点において更なる改善が要求されている。例えば、図７の（ｂ）に示すように、ボルト４を締め付けていく時に、弁本体３にセットした円筒部材５が、ボルト４と共に回転してしまい、弁本体３の雌ねじ部３ｂの奥に位置してしまう場合がある。このように、円筒部材５と弁蓋２の間に隙間が生じると、弁蓋２と弁本体３との接触面積が小さくなり、これらの接触面圧を高めることになる。この結果、この接触面の変形が生じやすくなり、変形が生じた場合には、高温の蒸気や流体を漏出させてしまうという問題がある。ボルト４の回転方向と逆ねじを円筒部材５の外周に設けることにより、円筒部材５と弁蓋２の間の隙間を解消することは可能であるが、この場合、ボルト４の締め付けにより円筒部材５が逆に上方に持ち上がり、弁本体３と弁蓋２の間に隙間を生じさせてしまう。この結果、高温の蒸気や流体が、この隙間から漏出するという問題を引き起こす。   However, the above fastening structure requires further improvement in the following points. For example, as shown in FIG. 7B, when the bolt 4 is tightened, the cylindrical member 5 set on the valve body 3 rotates together with the bolt 4, and is located behind the female thread 3b of the valve body 3. May be located. Thus, when a clearance gap arises between the cylindrical member 5 and the valve lid 2, the contact area of the valve lid 2 and the valve main body 3 will become small, and these contact surface pressures will be raised. As a result, deformation of the contact surface is likely to occur, and when deformation occurs, there is a problem that high-temperature steam or fluid is leaked. It is possible to eliminate the gap between the cylindrical member 5 and the valve lid 2 by providing the rotation direction of the bolt 4 and a reverse screw on the outer periphery of the cylindrical member 5. In this case, the cylindrical member is tightened by tightening the bolt 4. On the contrary, 5 is lifted upward, and a gap is generated between the valve body 3 and the valve lid 2. As a result, there is a problem that high-temperature steam or fluid leaks from this gap.

本発明は、上記事項に基づいてなされたもので、その目的は、高温流体を収納する容器の締結構造体を、比較的低コストでコンパクト化すると共に、締結部材内部の高温流体の漏出を確実に防止できるボルト締結構造を提供することにある。   The present invention has been made on the basis of the above-described matters, and an object of the present invention is to downsize a fastening structure of a container for storing a high-temperature fluid at a relatively low cost and to reliably leak out the high-temperature fluid inside the fastening member. Another object of the present invention is to provide a bolt fastening structure that can be prevented.

（１）上記目的を達成するために、本発明は、軸先端に雄ねじ部が形成されたボルトと、前記ボルトの雄ねじ部と螺合する雌ねじ部が形成されると共に外周部に雄ねじ部が形成された円筒部材と、前記円筒部材の雄ねじ部と螺合する雌ねじ部が形成された締結部材と、前記ボルトと前記締結部材との間に位置すると共に前記ボルトが貫通する穴を備えた被締結部材とを備え、前記ボルトによって前記被締結部材を前記締結部材に締結するボルト締結構造であって、前記締結部材には、前記円筒部材の深さ方向位置を固定できる円筒部材受け部が設けられ、前記円筒部材の深さ方向位置は、前記被締結部材と接触する側において前記円筒部材の表面と前記締結部材の表面がほぼ同一位置になるように構成し、且つ前記ボルトおよび前記円筒部材は、前記締結部材と比べ、より高強度の部材からなるものとする。   (1) In order to achieve the above object, according to the present invention, a bolt in which a male screw portion is formed at the shaft tip, a female screw portion that is screwed with the male screw portion of the bolt, and a male screw portion are formed in the outer peripheral portion. Fastened with a cylindrical member formed, a fastening member formed with a female screw part screwed with a male screw part of the cylindrical member, and a hole that is located between the bolt and the fastening member and through which the bolt penetrates A bolt fastening structure in which the fastened member is fastened to the fastening member by the bolt, and the fastening member is provided with a cylindrical member receiving portion capable of fixing a position in the depth direction of the cylindrical member. The position of the cylindrical member in the depth direction is such that the surface of the cylindrical member and the surface of the fastening member are substantially in the same position on the side in contact with the member to be fastened, and the bolt and the cylindrical member , Compared to the fastening member, and made of a higher strength of the member.

（２）上記（１）において、好ましくは、前記ボルトは、一方の軸先端に雄ねじ部が形成され、他方の軸先端に締付け頭部を供えたものとする。   (2) In the above (1), preferably, the bolt is provided with a male screw portion at one shaft tip and a tightening head at the other shaft tip.

（３）上記（１）において、好ましくは、前記ボルトは、軸の両先端に雄ねじ部が形成され、一方の軸先端雄ねじ部はナットにより締付け可能に構成されたものとする。   (3) In the above (1), preferably, the bolt is configured such that male screw portions are formed at both ends of the shaft, and one of the shaft tip male screw portions can be tightened by a nut.

（４）上記（３）において、好ましくは、前記ナットは、前記ボルト軸先端のねじ部を包むことが可能な袋状ナットであるものとする。   (4) In the above (3), preferably, the nut is a bag-like nut capable of wrapping the threaded portion at the tip of the bolt shaft.

（５）上記（１）において、好ましくは、クリープ強度が問題となる高温時において、前記ボルトもしくは前記ボルト、ナットおよび前記円筒部材は、雌ねじ部が形成された前記締結部材と比べ、より高強度となる部材とする。   (5) In the above (1), preferably, the bolt or the bolt, nut, and the cylindrical member have higher strength than the fastening member in which the female thread portion is formed at a high temperature at which creep strength is a problem. It becomes the member which becomes.

（６）上記（５）において、好ましくは、前記ボルトの部材としてニッケル基合金、前記円筒部材として12-Cr鋼、前記締結部材としてCr-Mo-V低合金鋼を用いたものとする。   (6) In the above (5), preferably, a nickel base alloy is used as the bolt member, 12-Cr steel is used as the cylindrical member, and Cr-Mo-V low alloy steel is used as the fastening member.

（７）上記（１）において、好ましくは、前記ボルト頭部の径は、前記円筒部材の径とほぼ等しいものとする。   (7) In the above (1), preferably, the diameter of the bolt head is substantially equal to the diameter of the cylindrical member.

（８）上記（３）において、好ましくは、前記ナットの径は、前記円筒部材の径とほぼ等しいものとする。   (8) In the above (3), preferably, the diameter of the nut is substantially equal to the diameter of the cylindrical member.

（９）上記（１）において、好ましくは、前記円筒部材は、頭部に工具と係合する凹部もしくは凸部が形成され、前記工具により前記締結部材へ螺合することが可能に構成されたものとする。   (9) In the above (1), preferably, the cylindrical member is configured such that a concave portion or a convex portion that engages with a tool is formed on a head, and can be screwed to the fastening member by the tool. Shall.

（１０）上記（１）において、好ましくは、前記円筒部材受け部は、前記締結部材の雌ねじ部の底部に前記締結部材と一体に形成されたものとする。   (10) In the above (1), preferably, the cylindrical member receiving portion is formed integrally with the fastening member at the bottom of the female screw portion of the fastening member.

（１１）上記（１）において、好ましくは、前記円筒部材受け部は、前記締結部材の雌ねじ部の底部にリング状の部材を挿入して設けたものとする。   (11) In the above (1), preferably, the cylindrical member receiving portion is provided by inserting a ring-shaped member into a bottom portion of the female screw portion of the fastening member.

本発明によれば、高温流体を収納する締結部材のボルト締結構造において、高強度部材の円筒部材を介して高強度部材のボルトと、通常部材からなる締結部材を連結したので、ボルト貫通孔を小さくすることができると共に、締結部材のねじ山の応力を低くすることができる。この結果、ボルト締結構造を比較的低コストでコンパクト化できる。また、締結部材には、円筒部材受け部が設けられたので、ボルト締め付け時に生じていた円筒部材の有害な回転が防止でき、被締結部材と締結部材の間に隙間が生じない。このことから、締結部材内部の高温流体の漏出を防止することができる。   According to the present invention, in the bolt fastening structure of the fastening member that stores the high temperature fluid, the bolt of the high strength member and the fastening member made of the normal member are connected via the cylindrical member of the high strength member. While being able to make small, the stress of the thread of a fastening member can be made low. As a result, the bolt fastening structure can be made compact at a relatively low cost. Further, since the fastening member is provided with the cylindrical member receiving portion, harmful rotation of the cylindrical member that has occurred at the time of bolt tightening can be prevented, and no gap is generated between the fastened member and the fastening member. For this reason, leakage of the high-temperature fluid inside the fastening member can be prevented.

以下に、本発明のボルト締結構造の実施の形態を図面を用いて説明する。
図１は、本発明のボルト締結構造の第１の実施の形態を示す縦断面図である。この図１において、ボルト締結構造体１は、軸先端に雄ねじ部４ａが形成されたボルト４と、ボルト４の雄ねじ部４ａと螺合する雌ねじ部５ｂが形成されると共に外周部に雄ねじ部５ａが形成された円筒部材５と、円筒部材５の雄ねじ部５ａと螺合する雌ねじ部３ｂが形成された締結部材としての弁本体３と、ボルト４と弁本体３の間に位置すると共にボルト４が貫通する貫通孔２ａを備えた被締結部材としての弁蓋２とを備えている。ここで、円筒部材５の外径を、例えば、ボルト４の頭部径と等しい径で形成してもよい。 Embodiments of the bolt fastening structure of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a bolt fastening structure of the present invention. In FIG. 1, a bolt fastening structure 1 includes a bolt 4 having a male threaded portion 4a formed at the tip of a shaft, a female threaded portion 5b screwed with the male threaded portion 4a of the bolt 4, and a male threaded portion 5a on the outer peripheral portion. Is located between the bolt body 4 and the valve body 3, and the bolt body 4 as a fastening member formed with the inside thread section 3b screwed with the male thread section 5a of the cylindrical member 5. And a valve lid 2 as a member to be fastened provided with a through hole 2a. Here, the outer diameter of the cylindrical member 5 may be formed with a diameter equal to the head diameter of the bolt 4, for example.

また、弁本体３の雌ねじ部３ｂの底部には、円筒部材５の表面と弁本体３の上部表面をほぼ同一位置にすべく円筒部材５の深さ方向位置を固定できる円筒部材受け部８が、弁本体３と一体に形成されている。さらに、ボルト４及び円筒部材５は弁本体３と比べ、より高強度な部材が用いられている。これらの高強度の部材としては、従来耐熱合金鋼として使用されているCr-Mo-V低合金鋼（クロムーモリブデンーバナジウム低合金鋼）などの耐熱合金鋼より高耐熱である例えば、インコネル等のニッケル基合金、オーステナイト系耐熱鋼、及び、１２Ｃｒ鋼等の高クロムフェライト鋼等が好ましい。   A cylindrical member receiving portion 8 that can fix the position in the depth direction of the cylindrical member 5 so that the surface of the cylindrical member 5 and the upper surface of the valve main body 3 are substantially at the same position is provided at the bottom of the female screw portion 3b of the valve body 3. The valve body 3 is formed integrally. Furthermore, the bolt 4 and the cylindrical member 5 are members having higher strength than the valve body 3. These high-strength members have higher heat resistance than heat-resistant alloy steels such as Cr-Mo-V low-alloy steels (chromium-molybdenum-vanadium low-alloy steels) conventionally used as heat-resistant alloy steels, such as Inconel Of these, nickel-base alloys, austenitic heat-resisting steels, high chromium ferritic steels such as 12Cr steel, and the like are preferable.

また、これらのボルト締結構造は、締結部材である弁本体３の雌ねじ部３ｂに、高強度部材からなる円筒部材５を弁本体３の外側から螺合してセットし、高強度部材からなるボルト４を被締結部材である弁蓋２の貫通孔２ａを通じて円筒部材５の雌ねじ部５ｂに螺合し、締め付ける。円筒部材５と弁本体３、及びボルト４と円筒部材５の各ねじ結合力によって、弁本体３と弁蓋２とをボルト締結するものである。   Further, these bolt fastening structures are such that a cylindrical member 5 made of a high-strength member is screwed from the outside of the valve body 3 to a female thread portion 3b of the valve body 3 that is a fastening member, and a bolt made of a high-strength member. 4 is screwed into the female screw portion 5b of the cylindrical member 5 through the through hole 2a of the valve lid 2 which is a member to be fastened, and tightened. The valve main body 3 and the valve lid 2 are bolted by the screw coupling forces of the cylindrical member 5 and the valve main body 3 and the bolt 4 and the cylindrical member 5.

本発明のボルト締結構造の第１の実施の形態によれば、ボルト４の径を細くしてねじ山の応力が高くなっても、高強度な部材を用いているため、ボルト４およびボルト４のねじ山の強度は十分に確保できる。円筒部材５も高強度な部材を用いているため、ボルト４の雄ねじ部４ａと螺合する円筒部材５の雌ねじおよび外周部の雄ねじのねじ山の強度も確保できる。円筒部材５の雄ねじ部５ａと螺合締結する締結部材である弁本体３のねじの径は十分大きいため、発生する応力は十分低くなり、弁本体３のねじ山の強度を確保できる。このように全てのねじ締結部で十分な強度を確保できることになる。   According to the first embodiment of the bolt fastening structure of the present invention, even if the diameter of the bolt 4 is reduced to increase the stress of the thread, a high-strength member is used. The strength of the thread can be sufficiently secured. Since the cylindrical member 5 is also a high-strength member, it is possible to ensure the strength of the threads of the female screw of the cylindrical member 5 and the male screw of the outer peripheral portion that are screwed into the male screw portion 4a of the bolt 4. Since the diameter of the screw of the valve body 3 which is a fastening member to be screwed and fastened with the male screw portion 5a of the cylindrical member 5 is sufficiently large, the generated stress is sufficiently low, and the strength of the thread of the valve body 3 can be secured. Thus, sufficient strength can be secured at all the screw fastening portions.

また、締結部材である弁本体３に円筒部材５の深さ方向位置を固定できる円筒部材受け部８が設けられているため、ボルト締付け時に円筒部材５の有害な回転が無くなり、円筒部材５の表面と弁本体３の表面はほぼ同一位置となり、弁本体３と弁蓋２の隙間が生じないため高温の蒸気や流体の漏れを防止できる。さらに、十分な接触面積な確保でき適切な接触面圧となるため接触部の局所変形を防止できる。   Further, since the cylindrical member receiving portion 8 that can fix the position in the depth direction of the cylindrical member 5 is provided on the valve body 3 that is a fastening member, the harmful rotation of the cylindrical member 5 is eliminated at the time of bolt tightening. Since the surface and the surface of the valve body 3 are substantially in the same position and no gap is formed between the valve body 3 and the valve lid 2, leakage of high-temperature steam or fluid can be prevented. Furthermore, since a sufficient contact area can be ensured and an appropriate contact surface pressure is obtained, local deformation of the contact portion can be prevented.

このように全てのねじ締結部で十分な強度を確保しつつボルト４の径を細くすることが可能となるため、被締結部材である弁蓋２のボルト貫通穴２ａを小さくでき、弁蓋２外径も小さくすることができ、結局ボルト締結構造体１の全体をコンパクト化できるようになる。   As described above, since it is possible to reduce the diameter of the bolt 4 while ensuring sufficient strength at all the screw fastening portions, the bolt through hole 2a of the valve lid 2 which is a member to be fastened can be reduced, and the valve lid 2 The outer diameter can also be reduced, and eventually the entire bolt fastening structure 1 can be made compact.

さらに、本実施の形態によれば、ボルト４の頭部径を円筒部材５の外径とほぼ等しい構成とすることができる。これによりクリープ強度が問題となる高温時においても、ボルト４の頭部と被締結部材である弁蓋２の接触部、および円筒部材５と弁蓋２の接触部において十分広い接触面積を確保できるため、接触部の面圧を下げ十分な強度を確保できる。   Furthermore, according to the present embodiment, the head diameter of the bolt 4 can be made substantially equal to the outer diameter of the cylindrical member 5. Thus, a sufficiently wide contact area can be secured at the contact portion between the head of the bolt 4 and the valve lid 2 that is the member to be fastened and the contact portion between the cylindrical member 5 and the valve lid 2 even at high temperatures where creep strength is a problem. For this reason, the surface pressure of the contact portion can be lowered to ensure sufficient strength.

さらに、本実施の形態によれば、クリープ強度が問題となる高温時において、締結部材である弁本体３と比べ、より高強度となる部材をボルト４および円筒部材５へ適用することが可能となる。これによりクリープ強度が問題となる高温時においても、全てのねじ締結部で十分な強度を確保でき、ボルト締結構造体１の全体をコンパクト化できる。具体的には、例えば、ボルト４の材料としてニッケル基合金、円筒部材５の材料として12Cr鋼、弁本体３の材料としてCr-Mo-V低合金鋼を用いることができる。これによりクリープ強度が問題となる高温時において、弁本体３と比べより高強度となる部材をボルト４および円筒部材５へ適用することが可能となる。   Furthermore, according to the present embodiment, it is possible to apply a member having higher strength to the bolt 4 and the cylindrical member 5 at a high temperature at which creep strength is a problem as compared with the valve body 3 that is a fastening member. Become. As a result, even at a high temperature where the creep strength becomes a problem, sufficient strength can be secured at all the screw fastening portions, and the entire bolt fastening structure 1 can be made compact. Specifically, for example, a nickel base alloy can be used as the material of the bolt 4, 12Cr steel can be used as the material of the cylindrical member 5, and Cr—Mo—V low alloy steel can be used as the material of the valve body 3. As a result, a member having higher strength than the valve body 3 can be applied to the bolt 4 and the cylindrical member 5 at a high temperature at which creep strength is a problem.

図２は、本発明のボルト締結構造の第２の実施の形態を示す縦断面図である。なお、以下の説明において第１の実施の形態と同一の部分または相当する部分には同一の符合を付し、その部分の説明は省略する。
本実施の形態においては、円筒部材受け部８ａが第１の実施の形態における円筒部材受け部８と異なる。つまり、円筒部材５の表面と弁本体３の上部表面を同一位置にすべく円筒部材５の深さ方向位置を固定できるリング状の円筒部材受け部８ａが、弁本体３の雌ねじ部３ｂの底部に、挿入されて設置されている。 FIG. 2 is a longitudinal sectional view showing a second embodiment of the bolt fastening structure of the present invention. In the following description, the same reference numerals are given to the same or corresponding parts as those in the first embodiment, and the description of those parts is omitted.
In the present embodiment, the cylindrical member receiving portion 8a is different from the cylindrical member receiving portion 8 in the first embodiment. That is, the ring-shaped cylindrical member receiving portion 8 a that can fix the position in the depth direction of the cylindrical member 5 so that the surface of the cylindrical member 5 and the upper surface of the valve main body 3 are located at the same position is the bottom of the female screw portion 3 b of the valve main body 3. It is inserted and installed.

本発明のボルト締結構造の第２の実施の形態によれば、上述した第１の実施の形態と同様な効果を得ることができると共に、締結部材である弁本体３に円筒部材５の深さ方向位置を固定できるリング状の円筒部材受け部８ａが設置されているため、ボルト締付け時に円筒部材５の有害な回転が無くなり、弁本体３と弁蓋２の隙間が生じないため高温の蒸気や流体の漏れを防止できる。   According to the second embodiment of the bolt fastening structure of the present invention, the same effect as that of the first embodiment described above can be obtained, and the depth of the cylindrical member 5 in the valve body 3 that is a fastening member can be obtained. Since the ring-shaped cylindrical member receiving portion 8a capable of fixing the directional position is installed, harmful rotation of the cylindrical member 5 is eliminated at the time of bolt tightening, and a gap between the valve body 3 and the valve lid 2 is not generated. Fluid leakage can be prevented.

このように円筒部材５の深さ方向位置を固定できるものであれば、締結部材である弁本体３を削り出す必要はなく、スペーサの役目をなすものを設置して円筒部材受け部８ａとして用いることができる。この結果、ボルト締結構造の製作コストを低減することができ、適用設備の経済性を向上させることができる。   As long as the position in the depth direction of the cylindrical member 5 can be fixed in this way, it is not necessary to cut out the valve body 3 that is a fastening member, and a member that serves as a spacer is installed and used as the cylindrical member receiving portion 8a. be able to. As a result, the manufacturing cost of the bolt fastening structure can be reduced, and the economic efficiency of the applied equipment can be improved.

図３は、本発明のボルト締結構造の第３の実施の形態を示す縦断面図である。なお、以下の説明において第１の実施の形態と同一の部分または相当する部分には同一の符合を付し、その部分の説明は省略する。   FIG. 3 is a longitudinal sectional view showing a third embodiment of the bolt fastening structure of the present invention. In the following description, the same reference numerals are given to the same or corresponding parts as those of the first embodiment, and the description of those parts is omitted.

本実施の形態において、ボルト締結構造体１は、軸の両先端に雄ねじ部４ａが形成されたボルト４と、ボルト４の一方の雄ねじ部４ｃと螺合するナット６と、ボルト４の他方の雄ねじ部４ａと螺合する雌ねじ部５ｂが形成されると共に外周部に雄ねじ部５ａが形成された円筒部材５と、円筒部材５の雄ねじ部５ａと螺合する雌ねじ部３ｂが形成された締結部材としての弁本体３と、ボルト４と弁本体３の間に位置すると共にボルト４が貫通する貫通孔２ａを備えた被締結部材としての弁蓋２とを備えている。ここで、円筒部材５の外径を、例えば、ナット６の径とほぼ等しい径で形成してもよい。   In the present embodiment, the bolt fastening structure 1 includes a bolt 4 in which male screw portions 4 a are formed at both ends of a shaft, a nut 6 screwed with one male screw portion 4 c of the bolt 4, and the other bolt 4. A cylindrical member 5 in which a female screw portion 5b that is screwed with the male screw portion 4a is formed and a male screw portion 5a is formed on the outer peripheral portion, and a fastening member in which a female screw portion 3b that is screwed with the male screw portion 5a of the cylindrical member 5 is formed. And a valve lid 2 as a member to be fastened, which is located between the bolt 4 and the valve body 3 and has a through hole 2a through which the bolt 4 passes. Here, the outer diameter of the cylindrical member 5 may be formed with a diameter substantially equal to the diameter of the nut 6, for example.

また、弁本体３の雌ねじ部３ｂの底部には、円筒部材５の表面と弁本体３の上部表面をほぼ同一位置にすべく円筒部材５の深さ方向位置を固定できる円筒部材受け部８が、弁本体３と一体に形成されている。さらに、ボルト４、ナット６及び円筒部材５は弁本体３と比べ、より高強度な部材が用いられている。   A cylindrical member receiving portion 8 that can fix the position in the depth direction of the cylindrical member 5 so that the surface of the cylindrical member 5 and the upper surface of the valve main body 3 are substantially at the same position is provided at the bottom of the female screw portion 3b of the valve body 3. The valve body 3 is formed integrally. Further, the bolt 4, the nut 6, and the cylindrical member 5 are members having higher strength than the valve body 3.

本発明のボルト締結構造の第３の実施の形態によれば、上述した第１の実施の形態と同様な効果を得ることができると共に、ナット６で締結する構成としたため、ボルト４とナット６を用いて締結するフランジや蓋の締結などに適用可能となり、十分な強度を確保でき、さらにボルト締結構造体１の全体をコンパクト化できる。   According to the third embodiment of the bolt fastening structure of the present invention, the same effect as that of the first embodiment described above can be obtained, and the bolt 6 and the nut 6 can be fastened with the nut 6. It can be applied to the fastening of a flange and a lid that are fastened using, so that sufficient strength can be secured, and the entire bolt fastening structure 1 can be made compact.

また、本実施の形態によれば、ナット６の径を円筒部材５の外径とほぼ等しい構成とすることができる。これによりクリープ強度が問題となる高温時においても、ナット６部と被締結部材である弁蓋２の接触部、および円筒部材５と弁蓋２の接触部において十分広い接触面積を確保できるため、接触部の面圧を下げ十分な強度を確保できる。   Further, according to the present embodiment, the diameter of the nut 6 can be made substantially equal to the outer diameter of the cylindrical member 5. As a result, a sufficiently wide contact area can be secured at the contact portion between the nut 6 and the valve lid 2 that is the member to be fastened, and the contact portion between the cylindrical member 5 and the valve lid 2 even at a high temperature at which creep strength becomes a problem. Sufficient strength can be secured by reducing the surface pressure of the contact portion.

さらに、本実施の形態によれば、クリープ強度が問題となる高温時において、締結部材である弁本体３と比べ、より高強度となる部材をボルト４、ナット６および円筒部材５へ適用することが可能となる。これによりクリープ強度が問題となる高温時においても、全てのねじ締結部で十分な強度を確保でき、ボルト締結構造体１の全体をコンパクト化できる。   Furthermore, according to the present embodiment, a member having higher strength than the valve body 3 that is a fastening member is applied to the bolt 4, the nut 6, and the cylindrical member 5 at a high temperature at which creep strength is a problem. Is possible. As a result, even at a high temperature where the creep strength becomes a problem, sufficient strength can be secured at all the screw fastening portions, and the entire bolt fastening structure 1 can be made compact.

図４は、本発明のボルト締結構造の第４の実施の形態を示す縦断面図である。なお、以下の説明において第１の実施の形態と同一の部分または相当する部分には同一の符合を付し、その部分の説明は省略する。   FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the bolt fastening structure of the present invention. In the following description, the same reference numerals are given to the same or corresponding parts as those of the first embodiment, and the description of those parts is omitted.

本実施の形態においては、袋状ナット６ａが第３の実施の形態におけるナット６と異なる。つまり、ボルト締結構造体１は、軸の両先端に雄ねじ部が形成されたボルト４の一方の雄ねじ部４ｃに螺合する袋状ナット６ａを備えている。   In the present embodiment, the bag-like nut 6a is different from the nut 6 in the third embodiment. That is, the bolt fastening structure 1 includes a bag-like nut 6a that is screwed into one male screw portion 4c of the bolt 4 having male screw portions formed at both ends of the shaft.

本発明のボルト締結構造の第４の実施の形態によれば、上述した第１の実施の形態と同様な効果を得ることができると共に、袋状ナット６ａで締結する構成としたため、締結部やボルト締付部で蒸気や流体の漏れを極力嫌う容器のフランジや蓋の締結などにも適用可能となり、十分な強度を確保でき、さらにボルト締結構造体１の全体をコンパクト化できる。   According to the fourth embodiment of the bolt fastening structure of the present invention, it is possible to obtain the same effect as that of the first embodiment described above, and because the configuration is fastened by the bag-like nut 6a, The bolt tightening portion can be applied to fastening of a flange and a lid of a container that does not want to leak steam or fluid as much as possible, and sufficient strength can be secured, and the entire bolt fastening structure 1 can be made compact.

また、本実施の形態によれば、クリープ強度が問題となる高温時において、締結部材である弁本体３と比べ、より高強度となる部材をボルト４、袋状ナット６ａおよび円筒部材５へ適用することが可能となる。これによりクリープ強度が問題となる高温時においても、全てのねじ締結部で十分な強度を確保でき、ボルト締結構造体１の全体をコンパクト化できる。   Further, according to the present embodiment, a member having higher strength than the valve body 3 that is a fastening member is applied to the bolt 4, the bag-like nut 6a, and the cylindrical member 5 at a high temperature at which creep strength is a problem. It becomes possible to do. As a result, even at a high temperature where the creep strength becomes a problem, sufficient strength can be secured at all the screw fastening portions, and the entire bolt fastening structure 1 can be made compact.

図５、図６は本発明のボルト締結構造の第５の実施の形態を示すもので、図５は、本発明のボルト締結構造の第５の実施の形態に係る円筒部材を示す正面図、図６は、本発明のボルト締結構造の第５の実施の形態に係る円筒部材を示す縦断面図である。なお、以下の説明において第１の実施の形態と同一の部分または相当する部分には同一の符合を付し、その部分の説明は省略する。   5 and 6 show a fifth embodiment of the bolt fastening structure of the present invention, and FIG. 5 is a front view showing a cylindrical member according to the fifth embodiment of the bolt fastening structure of the present invention. FIG. 6 is a longitudinal sectional view showing a cylindrical member according to a fifth embodiment of the bolt fastening structure of the present invention. In the following description, the same reference numerals are given to the same or corresponding parts as those of the first embodiment, and the description of those parts is omitted.

図５及び図６に示すように、円筒部材５の頭部には、ボルト４の雄ねじ部４ａが螺合する雌ねじ部５ｂが形成されたねじ穴９の他に、穴状の凹部７が２か所形成されている。例えば、一組の凸部を備えたコ字状の工具をこの凹部７，７に嵌合させ、円筒部材５の軸を中心としてこの工具を回転させることにより、締結部材である弁本体３へ容易に取付け取り外すことが可能になる。   As shown in FIGS. 5 and 6, in addition to the screw hole 9 in which the female screw part 5 b into which the male screw part 4 a of the bolt 4 is screwed is formed at the head of the cylindrical member 5, there are two hole-like concave parts 7. The place is formed. For example, by fitting a U-shaped tool having a pair of convex portions into the concave portions 7 and 7 and rotating the tool about the axis of the cylindrical member 5, the valve body 3 as a fastening member is obtained. It can be easily installed and removed.

本発明のボルト締結構造の第５の実施の形態によれば、締結部材である弁本体３と円筒部材５の取付け取り外しが容易になることから、ボルト締結構造体１のボルト締結時間を短縮することができ、作業効率の向上を図ることができる。   According to the fifth embodiment of the bolt fastening structure of the present invention, it is easy to attach and detach the valve body 3 and the cylindrical member 5 which are fastening members, so that the bolt fastening time of the bolt fastening structure 1 is shortened. Therefore, the work efficiency can be improved.

また、本実施の形態によれば、ボルト４もしくはボルト４、ナット６が酸化もしくは劣化した場合においても、円筒部材５を容易に取り外すことが可能であるため、ボルト４、ナット６および円筒部材５の交換が可能で容易に行える。この結果、締結部材である弁本体３を交換する必要がなくなり、ボルト締結構造体１の寿命を延ばすことが可能となりコスト上の長所が得られる。   Further, according to the present embodiment, even when the bolt 4 or the bolt 4 and the nut 6 are oxidized or deteriorated, the cylindrical member 5 can be easily removed, so that the bolt 4, the nut 6 and the cylindrical member 5 are removed. Can be exchanged easily. As a result, it is not necessary to replace the valve main body 3 that is a fastening member, the life of the bolt fastening structure 1 can be extended, and a cost advantage can be obtained.

なお、上述した実施の形態においては、円筒部材５の頭部に穴状の凹部７を形成し、工具により弁本体３へ螺合することが可能となる場合を説明したが、これに限らない。例えば、頭部に工具と係止する凹部もしくは凸部が形成され、工具により弁本体３へ螺合することが可能に構成されていれば本発明と同様の効果が得られる。   In the above-described embodiment, the case where the hole-like recess 7 is formed in the head of the cylindrical member 5 and can be screwed into the valve main body 3 with a tool has been described. However, the present invention is not limited thereto. . For example, the same effect as that of the present invention can be obtained if a concave portion or a convex portion to be engaged with the tool is formed on the head and the valve main body 3 can be screwed with the tool.

本発明のボルト締結構造の第１の実施の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 1st Embodiment of the bolt fastening structure of this invention. 本発明のボルト締結構造の第２の実施の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the bolt fastening structure of this invention. 本発明のボルト締結構造の第３の実施の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 3rd Embodiment of the bolt fastening structure of this invention. 本発明のボルト締結構造の第４の実施の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 4th Embodiment of the bolt fastening structure of this invention. 本発明のボルト締結構造の第５の実施の形態に係る円筒部材を示す正面図である。It is a front view which shows the cylindrical member which concerns on 5th Embodiment of the bolt fastening structure of this invention. 本発明のボルト締結構造の第５の実施の形態に係る円筒部材を示す縦断面図である。It is a longitudinal cross-sectional view which shows the cylindrical member which concerns on 5th Embodiment of the bolt fastening structure of this invention. 従来の蒸気タービン用の弁のボルト締結構造を説明する縦断面図である。It is a longitudinal cross-sectional view explaining the bolt fastening structure of the valve | bulb for conventional steam turbines. 従来の蒸気タービン用加減弁の内部を示す縦断面図である。It is a longitudinal cross-sectional view which shows the inside of the conventional steam turbine control valve.

符号の説明Explanation of symbols

１ 締結構造体
２ 被締結部材（弁蓋）
２ａ 貫通孔
３ 締結部材（弁本体）
３ｂ 雌ねじ部
４ ボルト
４ａ 雄ねじ部
４ｃ 雄ねじ部
５ 円筒部材
５ａ 雄ねじ部
５ｂ 雌ねじ部
６ ナット
６ａ 袋状ナット
７ 凹部
８ 円筒部材受け部
８ａ 円筒部材受け部（スペーサ） 1 Fastening structure 2 Fastened member (valve cover)
2a Through hole 3 Fastening member (valve body)
3b Female thread part 4 Bolt 4a Male thread part 4c Male thread part 5 Cylindrical member 5a Male thread part 5b Female thread part 6 Nut 6a Bag-shaped nut 7 Recess 8 Cylindrical member receiving part 8a Cylindrical member receiving part (spacer)

Claims (11)

軸先端に雄ねじ部が形成されたボルトと、
前記ボルトの雄ねじ部と螺合する雌ねじ部が形成されると共に外周部に雄ねじ部が形成された円筒部材と、
前記円筒部材の雄ねじ部と螺合する雌ねじ部が形成された締結部材と、
前記ボルトと前記締結部材との間に位置すると共に前記ボルトが貫通する穴を備えた被締結部材とを備え、前記ボルトによって前記被締結部材を前記締結部材に締結するボルト締結構造であって、
前記締結部材には、前記円筒部材の深さ方向位置を固定できる円筒部材受け部が設けられ、前記円筒部材の深さ方向位置は、前記被締結部材と接触する側において前記円筒部材の表面と前記締結部材の表面がほぼ同一位置になるように構成し、且つ前記ボルトおよび前記円筒部材は、前記締結部材と比べ、より高強度の部材からなることを特徴とするボルト締結構造。 A bolt with a male thread formed on the shaft tip;
A cylindrical member in which a female screw portion that is screwed with a male screw portion of the bolt is formed and a male screw portion is formed on the outer peripheral portion;
A fastening member in which a female screw portion that is screwed with a male screw portion of the cylindrical member is formed,
A bolt fastening structure that is located between the bolt and the fastening member and has a fastening member provided with a hole through which the bolt passes, and that fastens the fastening member to the fastening member with the bolt;
The fastening member is provided with a cylindrical member receiving portion that can fix the depth direction position of the cylindrical member, and the depth direction position of the cylindrical member is the surface of the cylindrical member on the side in contact with the fastened member. The bolt fastening structure is configured such that surfaces of the fastening members are substantially at the same position, and the bolt and the cylindrical member are made of a member having higher strength than the fastening member. 請求項１に記載のボルト締結構造において、
前記ボルトは、一方の軸先端に雄ねじ部が形成され、他方の軸先端に締付け頭部を供えたことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
The bolt has a male screw portion formed at one shaft tip and a fastening head provided at the other shaft tip. 請求項１に記載のボルト締結構造において、
前記ボルトは、軸の両先端に雄ねじ部が形成され、一方の軸先端雄ねじ部はナットにより締付け可能に構成されたことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
The bolt has a male screw portion formed at both ends of the shaft, and one of the shaft tip male screw portions can be tightened with a nut. 請求項３に記載のボルト締結構造において、
前記ナットは、前記ボルト軸先端のねじ部を包むことが可能な袋状ナットであることを特徴とするボルト締結構造。 In the bolt fastening structure according to claim 3,
The bolt fastening structure according to claim 1, wherein the nut is a bag-shaped nut capable of wrapping a screw portion at a tip end of the bolt shaft. 請求項１に記載のボルト締結構造において、
クリープ強度が問題となる高温時において、前記ボルトもしくは前記ボルト、ナットおよび前記円筒部材は、雌ねじ部が形成された前記締結部材と比べ、より高強度となる部材とすることを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
Bolt fastening, wherein the bolt or the bolt, nut, and the cylindrical member are members having higher strength than the fastening member having the female screw portion at a high temperature where creep strength is a problem. Construction. 請求項５に記載のボルト締結構造において、
前記ボルトの部材としてニッケル基合金、前記円筒部材として12-Cr鋼、前記締結部材としてCr-Mo-V低合金鋼を用いたことを特徴とするボルト締結構造。 In the bolt fastening structure according to claim 5,
A bolt fastening structure using a nickel base alloy as the bolt member, 12-Cr steel as the cylindrical member, and Cr-Mo-V low alloy steel as the fastening member. 請求項１に記載のボルト締結構造において、
前記ボルト頭部の径は、前記円筒部材の径とほぼ等しいことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
The bolt fastening structure is characterized in that a diameter of the bolt head is substantially equal to a diameter of the cylindrical member. 請求項３に記載のボルト締結構造において、
前記ナットの径は、前記円筒部材の径とほぼ等しいことを特徴とするボルト締結構造。 In the bolt fastening structure according to claim 3,
A bolt fastening structure, wherein a diameter of the nut is substantially equal to a diameter of the cylindrical member. 請求項１に記載のボルト締結構造において、
前記円筒部材は、頭部に工具と係合する凹部もしくは凸部が形成され、前記工具により前記締結部材へ螺合することが可能に構成されたことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
A bolt fastening structure, wherein the cylindrical member is formed with a concave portion or a convex portion that engages with a tool on a head, and can be screwed to the fastening member by the tool. 請求項１に記載のボルト締結構造において、
前記円筒部材受け部は、前記締結部材の雌ねじ部の底部に前記締結部材と一体に形成されたことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
The cylindrical member receiving portion is formed integrally with the fastening member at the bottom of the female screw portion of the fastening member. 請求項１に記載のボルト締結構造において、
前記円筒部材受け部は、前記締結部材の雌ねじ部の底部にリング状の部材を挿入して設けたことを特徴とするボルト締結構造。 The bolt fastening structure according to claim 1,
The bolt fastening structure, wherein the cylindrical member receiving portion is provided by inserting a ring-shaped member at the bottom of the female screw portion of the fastening member.
JP2008220343A 2008-08-28 2008-08-28 Bolt fastening structure Pending JP2010053976A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013174282A (en) * 2012-02-24 2013-09-05 Sumitomo Rubber Ind Ltd Screw bush mounting implement
JP7487009B2 (en) 2020-05-26 2024-05-20 株式会社東芝 Fastening materials

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JPS6061405A (en) * 1983-09-14 1985-04-09 Matsushita Electric Works Ltd Belt conveyor device
JPS61152911A (en) * 1984-12-26 1986-07-11 Toshiba Corp Turbine casing
JPS63138405A (en) * 1986-11-29 1988-06-10 Sharp Corp Timing control device for drive mechanism
JPH0471197A (en) * 1990-07-10 1992-03-05 Tohoku Electric Power Co Inc Ground discharge preventive device of ion active emission type
JPH0674224A (en) * 1992-05-21 1994-03-15 Mitsubishi Heavy Ind Ltd High-temperature bolt material
JP2001107922A (en) * 1999-10-08 2001-04-17 Mitsubishi Heavy Ind Ltd Fastening structure of flangeless casing
JP2002510260A (en) * 1997-04-18 2002-04-02 コンチネンタル・テベス・アーゲー・ウント・コンパニー・オーハーゲー Motor drive
JP2002235721A (en) * 2001-02-13 2002-08-23 Japan Steel Works Ltd:The Bolt fastening structure of pressure equipment component

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JPS6061405A (en) * 1983-09-14 1985-04-09 Matsushita Electric Works Ltd Belt conveyor device
JPS61152911A (en) * 1984-12-26 1986-07-11 Toshiba Corp Turbine casing
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JPH0471197A (en) * 1990-07-10 1992-03-05 Tohoku Electric Power Co Inc Ground discharge preventive device of ion active emission type
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013174282A (en) * 2012-02-24 2013-09-05 Sumitomo Rubber Ind Ltd Screw bush mounting implement
JP7487009B2 (en) 2020-05-26 2024-05-20 株式会社東芝 Fastening materials

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