JP6931532B2 - A fixture and a valve actuator comprising the fixture. - Google Patents

A fixture and a valve actuator comprising the fixture. Download PDF

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JP6931532B2
JP6931532B2 JP2017001696A JP2017001696A JP6931532B2 JP 6931532 B2 JP6931532 B2 JP 6931532B2 JP 2017001696 A JP2017001696 A JP 2017001696A JP 2017001696 A JP2017001696 A JP 2017001696A JP 6931532 B2 JP6931532 B2 JP 6931532B2
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straight portion
inclined surface
bolt
fixture
hole
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JP2018112215A (en
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龍男 山根
龍男 山根
主計 北島
主計 北島
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Seibu Electric and Machinery Co Ltd
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Description

本発明は、固定具及びその固定具を具備するバルブアクチュエータに関する。 The present invention relates to a fixture and a valve actuator comprising the fixture.

ボルト及びナットを有する固定具（特許文献１、２参照）は、２つの物体を固定するものとして普及している。ボルトは、頭部と頭部に連結されたストレート部とを有し、ストレート部にはナットが装着可能なねじ山が形成されている。 Fixtures having bolts and nuts (see Patent Documents 1 and 2) are widely used for fixing two objects. The bolt has a head and a straight portion connected to the head, and the straight portion is formed with a thread on which a nut can be attached.

特開２０１３−２５３６９０号公報Japanese Unexamined Patent Publication No. 2013-253690 特開２０１５−２１５９５号公報JP-A-2015-21595

ボルト及びナットで固定している２つの物体の一方に、ボルトの軸心に垂直な外力が与えられると、外力が与えられた物体からボルトに対して、ボルトの軸心に垂直な力が作用する。そして、ボルトに対し、ボルトの軸心に垂直な力が繰り返し作用すると、ボルトに割れが生じ、最終的にはボルトの切断に至る。切断は、ボルトの頭部とストレート部の連結箇所や、ストレート部のナットの装着箇所で生じることが多い。
本発明は、かかる事情に鑑みてなされるもので、ボルトの頭部付近に割れや切断が生じるのを抑制する固定具及びその固定具を具備するバルブアクチュエータを提供することを目的とする。 When an external force perpendicular to the axis of the bolt is applied to one of the two objects fixed by the bolt and nut, a force perpendicular to the axis of the bolt acts on the bolt from the object to which the external force is applied. do. Then, when a force perpendicular to the axis of the bolt repeatedly acts on the bolt, the bolt cracks and finally the bolt is cut. Cutting often occurs at the connection point between the head of the bolt and the straight portion, or at the mounting location of the nut on the straight portion.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fixture for suppressing cracking or cutting near the head of a bolt, and a valve actuator provided with the fixture.

前記目的に沿う第１の発明に係る固定具は、ナットと、前記ナットが装着されるストレート部、及び、該ストレート部に連結された頭部を有するボルトと、前記ストレート部が挿通する貫通孔が中央に形成され、外縁側から該貫通孔に向かって一定の割合で下り傾斜した傾斜面を一側に有する座金とを備え、前記傾斜面は、前記貫通孔の周りに全周にわたって設けられ、傾斜角度が２０°〜５０°の範囲であり、前記頭部の前記ストレート部側には、該ストレート部に向かって一定の割合で縮径して、前記傾斜面に面接触する縮径領域が形成され、前記ストレート部を曲げる向きの外力が前記ボルトに作用して前記縮径領域の一部が前記傾斜面から離れた状態は、前記座金から前記ボルトに作用する前記傾斜面に垂直な力により、該縮径領域の全体が該傾斜面に面接触する状態に戻される。
なお、座金の一側とは、座金の貫通孔の軸心に沿って一側を意味する。 The fixture according to the first invention according to the above object is a nut, a straight portion to which the nut is mounted, a bolt having a head connected to the straight portion, and a through hole through which the straight portion is inserted. Is provided in the center and has a washer having an inclined surface on one side that is inclined downward from the outer edge side toward the through hole at a constant ratio, and the inclined surface is provided around the through hole over the entire circumference. , The inclination angle is in the range of 20 ° to 50 °, and the diameter of the straight portion side of the head is reduced at a constant rate toward the straight portion, and the diameter is reduced so as to come into surface contact with the inclined surface. Is formed, an external force in the direction of bending the straight portion acts on the bolt, and a part of the reduced diameter region is separated from the inclined surface, which is perpendicular to the inclined surface acting on the bolt from the washer. The force returns the entire reduced diameter region to a state of surface contact with the inclined surface.
The one side of the washer means one side along the axis of the through hole of the washer.

第１の発明に係る固定具において、前記ボルトはリーマボルトであるのが好ましい。 In the fixture according to the first invention, the bolt is preferably a reamer bolt.

前記目的に沿う第２の発明に係るバルブアクチュエータは、駆動源と、前記駆動源の駆動力を弁体に伝える動力伝達機構とを有して、前記弁体を開閉するバルブアクチュエータにおいて、前記動力伝達機構は、ウォームと、前記ウォームに噛み合ったウォームホイルと、外周に前記ウォームホイルが取り付けられた円筒状のスリーブと、前記ウォームホイルを前記スリーブに固定する固定具とを具備し、前記固定具は、ナットと、前記スリーブの一部及び前記ウォームホイルを貫通し、前記ナットが装着されたストレート部、及び、該ストレート部に連結された頭部を有するボルトと、前記ストレート部が挿通する貫通孔が中央に形成され、外縁側から該貫通孔に向かって一定の割合で下り傾斜した傾斜面を一側に有し、他側が前記ウォームホイル又は前記スリーブに接触する座金とを備え、前記傾斜面は、前記貫通孔の周りに全周にわたって設けられ、傾斜角度が２０°〜５０°の範囲であり、前記頭部の前記ストレート部側には、該ストレート部に向かって一定の割合で縮径して、前記傾斜面に面接触した縮径領域が形成され、前記ストレート部を曲げる向きの外力が前記ボルトに作用して前記縮径領域の一部が前記傾斜面から離れた状態は、前記座金から前記ボルトに作用する前記傾斜面に垂直な力により、該縮径領域の全体が該傾斜面に面接触する状態に戻される。
なお、座金の一側及び他側とは、座金の貫通孔の軸心に沿って一側及び他側をそれぞれ意味する。 A valve actuator according to a second invention according to the above object has a drive source and a power transmission mechanism for transmitting the driving force of the drive source to the valve body, and is a valve actuator that opens and closes the valve body. The transmission mechanism includes a worm, a worm foil that meshes with the worm, a cylindrical sleeve having the worm foil attached to the outer periphery thereof, and a fixture for fixing the worm foil to the sleeve. Penetrates the nut, a part of the sleeve and the worm foil, and the straight portion to which the nut is mounted, and a bolt having a head connected to the straight portion, and the straight portion are inserted through the bolt. The hole is formed in the center, has an inclined surface that is inclined downward at a constant ratio from the outer edge side toward the through hole on one side, and has a washer that contacts the worm foil or the sleeve on the other side. The surface is provided around the through hole over the entire circumference, the inclination angle is in the range of 20 ° to 50 °, and the straight portion side of the head is contracted at a constant rate toward the straight portion. A state in which a reduced diameter region that is in surface contact with the inclined surface is formed and an external force in the direction of bending the straight portion acts on the bolt and a part of the reduced diameter region is separated from the inclined surface is described. By the force perpendicular to the inclined surface acting on the bolt from the washer, the entire reduced diameter region is returned to the state of being in surface contact with the inclined surface .
The one side and the other side of the washer mean one side and the other side along the axis of the through hole of the washer, respectively.

第１の発明に係る固定具及び第２の発明に係るバルブアクチュエータは、座金の傾斜面が、座金の貫通孔の周りに全周にわたって設けられ、ボルトの頭部のストレート部側には、ストレート部に向かって一定の割合で縮径して、傾斜面に面接触する縮径領域が形成されているので、ボルトを曲げる方向に力が作用して、ボルトの頭部の縮径領域が傾斜面に面接触していない状態になった際には、傾斜面から縮径領域に対して、縮径領域が傾斜面に面接触するようにボルトの頭部の配置を修正する力が作用する。ボルトの頭部にかかる負荷の偏りは、縮径領域が傾斜面に面接触していない状態が、縮径領域が傾斜面に面接触している状態に比べ大きくなることから、第１の発明に係る固定具及び第２の発明に係るバルブアクチュエータは、ボルトの頭部付近に割れや切断が生じるのを抑制可能である。 In the fixture according to the first invention and the valve actuator according to the second invention, the inclined surface of the washer is provided all around the through hole of the washer, and the straight portion side of the head of the bolt is straight. Since the diameter of the bolt is reduced at a constant rate toward the portion to form a diameter-reduced region that comes into surface contact with the inclined surface, a force acts in the direction of bending the bolt, and the diameter-reduced region of the head of the bolt is inclined. When the surface is not in surface contact, a force for correcting the arrangement of the bolt head so that the reduced diameter region is in surface contact with the inclined surface acts from the inclined surface to the reduced diameter region. .. The bias of the load applied to the head of the bolt is larger in the state where the reduced diameter region is not in surface contact with the inclined surface than in the state where the reduced diameter region is in surface contact with the inclined surface. The fixture according to the above and the valve actuator according to the second invention can suppress cracking or cutting near the head of the bolt.

（Ａ）は本発明の一実施の形態に係る固定具の側面図であり、（Ｂ）はボルトの頭部と座金の説明図である。(A) is a side view of a fixture according to an embodiment of the present invention, and (B) is an explanatory view of a bolt head and a washer. （Ａ）、（Ｂ）はそれぞれ、ボルトの側面図及び正面図である。(A) and (B) are a side view and a front view of the bolt, respectively. 座金の説明図である。It is explanatory drawing of a washer. （Ａ）、（Ｂ）はそれぞれ、本発明の一実施の形態に係る固定具による固定の様子を示す説明図である。(A) and (B) are explanatory views which show the state of fixing by the fixture which concerns on one Embodiment of this invention, respectively. 同固定具を具備するバルブアクチュエータの説明図である。It is explanatory drawing of the valve actuator provided with the fixture. 同固定具でウォームホイルとスリーブを固定した様子を示す説明図である。It is explanatory drawing which shows the state that the worm foil and the sleeve were fixed by the same fixture.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
図１（Ａ）、（Ｂ）、図２（Ａ）、（Ｂ）、図３に示すように、本発明の一実施の形態に係る固定具１０は、ナット１１と、ナット１１が装着されるストレート部１２及びストレート部１２に連結された頭部１３を有するボルト１４と、ストレート部１２が挿通する貫通孔１５が中央に形成された座金１６とを備えている。以下、詳細に説明する。 Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
As shown in FIGS. 1A, 1B, 2A, 2B, and 3B, the fixture 10 according to the embodiment of the present invention is equipped with a nut 11 and a nut 11. A bolt 14 having a straight portion 12 and a head portion 13 connected to the straight portion 12 and a washer 16 having a through hole 15 through which the straight portion 12 is inserted are provided in the center. Hereinafter, a detailed description will be given.

ナット１１は、金属製で、図１（Ａ）に示すように、内側に雌螺子構造を有する六角ナットである。
ボルト１４は、金属製で、図２（Ａ）、（Ｂ）に示すように、先側に雄螺子領域１７が設けられた円柱状のストレート部１２と、ストレート部１２の基側に連結された頭部１３を有している。ストレート部１２の雄螺子領域１７とナット１１の雌螺子構造は嵌合可能であり、ナット１１は、図１（Ａ）に示すように、ストレート部１２の雄螺子領域１７に装着される。 The nut 11 is a hexagon nut made of metal and having a female screw structure inside as shown in FIG. 1 (A).
As shown in FIGS. 2A and 2B, the bolt 14 is made of metal and is connected to a columnar straight portion 12 provided with a male screw region 17 on the front side and a base side of the straight portion 12. It has a head 13. The male screw region 17 of the straight portion 12 and the female screw structure of the nut 11 can be fitted, and the nut 11 is mounted on the male screw region 17 of the straight portion 12 as shown in FIG. 1 (A).

ボルト１４の頭部１３には、図２（Ａ）、（Ｂ）に示すように、六角レンチが差し込まれる六角穴１８が形成されている。頭部１３のストレート部１２側には、図１（Ｂ）、図２（Ａ）に示すように、ストレート部１２に向かって一定の割合で縮径する縮径領域１９が形成されている。
本実施の形態では、ボルト１４がリーマボルトである。
座金１６は、図３に示すように、環状であり、中央にストレート部１２が挿通する貫通孔１５が形成され、図１（Ｂ）に示すように、一側（貫通孔１５の軸心に沿って一側）に外縁側から貫通孔１５に向かって一定の割合で下り傾斜した傾斜面２０を有している。 As shown in FIGS. 2A and 2B, a hexagonal hole 18 into which a hexagon wrench is inserted is formed in the head portion 13 of the bolt 14. As shown in FIGS. 1B and 2A, a reduced diameter region 19 is formed on the straight portion 12 side of the head portion 13 so as to reduce the diameter toward the straight portion 12 at a constant rate.
In this embodiment, the bolt 14 is a reamer bolt.
As shown in FIG. 3, the washer 16 is annular, and a through hole 15 through which the straight portion 12 is inserted is formed in the center, and as shown in FIG. 1 (B), one side (at the axis of the through hole 15) is formed. It has an inclined surface 20 that is inclined downward at a constant rate from the outer edge side toward the through hole 15 (on one side along the line).

傾斜面２０は、貫通孔１５の周りに全周にわたって設けられており、本実施の形態では、傾斜面２０の傾斜角度θが２０°〜５０°の範囲である。
縮径領域１９は、縮径領域１９が傾斜面２０の貫通孔１５の周りの全周の領域に面接触可能な割合で縮径しており、縮径領域１９は、傾斜面２０全体に密着することができる。
次に、図４（Ａ）、（Ｂ）を参照して、固定具１０による２つの部材２１、２２の固定について説明する。 The inclined surface 20 is provided around the entire circumference of the through hole 15, and in the present embodiment, the inclined surface 20 has an inclined angle θ in the range of 20 ° to 50 °.
In the reduced diameter region 19, the reduced diameter region 19 is reduced in diameter at a ratio that allows surface contact with the region around the entire circumference of the through hole 15 of the inclined surface 20, and the reduced diameter region 19 is in close contact with the entire inclined surface 20. can do.
Next, the fixing of the two members 21 and 22 by the fixture 10 will be described with reference to FIGS. 4 (A) and 4 (B).

部材２１には、図４（Ａ）に示すように、平面部２３及び円柱状の貫通孔２４が設けられており、部材２２には、平面部２５、円柱状の貫通孔２６及び貫通孔２６に連続して形成された円柱状の穴２７が設けられている。貫通孔２６及び穴２７は同心上に配置され、穴２７の径は貫通孔２６の径より大きく、貫通孔２４、２６の径は同じ大きさである。
部材２１、２２は、平面部２３、２５が面接触し、貫通孔２４、２６が同心上に配された状態で、固定具１０によって固定される。 As shown in FIG. 4A, the member 21 is provided with a flat surface portion 23 and a columnar through hole 24, and the member 22 is provided with a flat surface portion 25, a columnar through hole 26, and a through hole 26. A columnar hole 27 formed continuously is provided in the hole 27. The through holes 26 and 27 are arranged concentrically, the diameter of the holes 27 is larger than the diameter of the through holes 26, and the diameters of the through holes 24 and 26 are the same.
The members 21 and 22 are fixed by the fixture 10 in a state where the flat surfaces 23 and 25 are in surface contact with each other and the through holes 24 and 26 are concentrically arranged.

固定具１０によって部材２１、２２を固定する際、座金１６をストレート部１２に装着した状態で、ストレート部１２を貫通孔２４、２６に嵌入することによって、図４（Ａ）、（Ｂ）に示すように、傾斜面２０が縮径領域１９に面接触し、座金１６の他側（貫通孔１５の軸心に沿って他側）が穴２７の底に密着し、雄螺子領域１７が、貫通孔２４から突出した状態にする。そして、ナット１１を雄螺子領域１７に装着し、図４（Ａ）に示すように、ナット１１が部材２１に密着するようにして、固定具１０による部材２１、２２の固定が完了する。 When the members 21 and 22 are fixed by the fixture 10, the straight portion 12 is fitted into the through holes 24 and 26 with the washer 16 attached to the straight portion 12, so that the members 21 and 22 are shown in FIGS. 4 (A) and 4 (B). As shown, the inclined surface 20 is in surface contact with the reduced diameter region 19, the other side of the washer 16 (the other side along the axial center of the through hole 15) is in close contact with the bottom of the hole 27, and the male screw region 17 is formed. It is in a state of protruding from the through hole 24. Then, the nut 11 is attached to the male screw region 17, and as shown in FIG. 4A, the nut 11 is brought into close contact with the member 21, and the fixing of the members 21 and 22 by the fixture 10 is completed.

固定具１０によって部材２１、２２を固定している状態で、座金１６から頭部１３に対しては、図４（Ｂ）に示すように、くさび効果によって、傾斜面２０に垂直な力Ｒが作用している。このため、座金１６からボルト１４に作用する垂直な力Ｒにより、ボルト１４の軸心は貫通孔２４、２６の軸心に配置される。
従って、ボルト１４に、ストレート部１２を曲げる向きの外力が作用して、全体が傾斜面２０に面接触していた縮径領域１９の一部が傾斜面２０から離れた場合、頭部１３の配置は、力Ｒによって、縮径領域１９全体が傾斜面２０に面接触するように戻される。 With the members 21 and 22 fixed by the fixture 10, a force R perpendicular to the inclined surface 20 is applied to the washer 16 to the head 13 due to the wedge effect as shown in FIG. 4 (B). It's working. Therefore, the axial center of the bolt 14 is arranged at the axial center of the through holes 24 and 26 by the vertical force R acting on the bolt 14 from the washer 16.
Therefore, when an external force in the direction of bending the straight portion 12 acts on the bolt 14, and a part of the reduced diameter region 19 that is in surface contact with the inclined surface 20 is separated from the inclined surface 20, the head 13 The arrangement is returned by the force R so that the entire reduced diameter region 19 is in surface contact with the inclined surface 20.

ここで、傾斜面２０の傾斜角度θが小さすぎると、一部が傾斜面２０から離れた縮径領域１９を全体が傾斜面２０に面接触するように頭部１３を配置しようとする作用が弱くなり、傾斜面２０の傾斜角度θが大きすぎると、縮径領域１９の傾斜角度が大きくなって、ボルト１４の設計の自由度が制限される。これらを踏まえ、傾斜面２０の傾斜角度θの好ましい範囲を鋭意検討し、本実施の形態では、傾斜面２０の傾斜角度θを２０°〜５０°の範囲にしている。 Here, if the inclination angle θ of the inclined surface 20 is too small, there is an action of arranging the head 13 so that the entire reduced diameter region 19 partially separated from the inclined surface 20 is in surface contact with the inclined surface 20. If it becomes weak and the inclination angle θ of the inclined surface 20 is too large, the inclination angle of the diameter reduction region 19 becomes large, and the degree of freedom in designing the bolt 14 is limited. Based on these, the preferable range of the inclination angle θ of the inclined surface 20 is diligently examined, and in the present embodiment, the inclination angle θ of the inclined surface 20 is set to the range of 20 ° to 50 °.

縮径領域１９の一部が傾斜面２０から離れていることは、ストレート部１２の頭部１３への連結箇所に、ストレート部１２を切断する向きの負荷が生じていることを意味する。
よって、縮径領域１９の一部が傾斜面２０から離れた状態を、縮径領域１９全体が傾斜面２０に面接触する状態に直ぐに戻すことで、ストレート部１２の頭部１３への連結箇所に破損が生じるのを抑制できる。 The fact that a part of the reduced diameter region 19 is separated from the inclined surface 20 means that a load in the direction of cutting the straight portion 12 is generated at the connecting portion of the straight portion 12 to the head portion 13.
Therefore, by immediately returning the state in which a part of the reduced diameter region 19 is separated from the inclined surface 20 to the state in which the entire reduced diameter region 19 is in surface contact with the inclined surface 20, the connecting portion of the straight portion 12 to the head 13 is formed. It is possible to suppress the occurrence of damage to the head.

次に、図５、図６を参照して、固定具１０を具備するバルブアクチュエータ３０について説明する。
本発明の一実施の形態に係るバルブアクチュエータ３０は、図５に示すように、駆動源３１と、駆動源３１の駆動力を弁体３２に伝える動力伝達機構３３とを有して、円盤状の弁体３２を開閉するものである。バルブアクチュエータ３０は、円環状の枠体３４に回転可能に取り付けられた弁体３２に連結されている。 Next, the valve actuator 30 including the fixture 10 will be described with reference to FIGS. 5 and 6.
As shown in FIG. 5, the valve actuator 30 according to the embodiment of the present invention has a drive source 31 and a power transmission mechanism 33 that transmits the driving force of the drive source 31 to the valve body 32, and has a disk shape. The valve body 32 of the above is opened and closed. The valve actuator 30 is connected to a valve body 32 rotatably attached to an annular frame body 34.

カバー体３５内に収容された動力伝達機構３３は、図５、図６に示すように、駆動源３１の図示しない出力軸に連結され、駆動源３１の作動によって回転する水平配置されたシャフト３６と、シャフト３６に装着されたウォーム３７と、ウォーム３７に噛み合った歯部３８を有するウォームホイル３９と、外周にウォームホイル３９が取り付けられた円筒状のスリーブ４０を備えている。駆動源３１の出力軸は右回転及び左回転が可能であり、シャフト３６及びウォーム３７は、駆動源３１の出力軸と同方向に回転する。 As shown in FIGS. 5 and 6, the power transmission mechanism 33 housed in the cover body 35 is connected to an output shaft (not shown) of the drive source 31, and is a horizontally arranged shaft 36 that rotates by the operation of the drive source 31. A worm 37 mounted on the shaft 36, a worm foil 39 having tooth portions 38 meshed with the worm 37, and a cylindrical sleeve 40 having the worm foil 39 attached to the outer periphery thereof are provided. The output shaft of the drive source 31 can rotate clockwise and counterclockwise, and the shaft 36 and the worm 37 rotate in the same direction as the output shaft of the drive source 31.

スリーブ４０の外周の一部領域には、図６に示すように、周方向に設けられた（周方向に長い）突出部４１が形成され、ウォームホイル３９は、突出部４１に上側から密着する突出部４２を有している。突出部４１、４２は、密着した状態で、複数の固定具１０によって固定されている。
ボルト１４は、頭部１３が下側に配され、ストレート部１２が密着して噛み合った突出部４１、４２を垂直に貫通し、雄螺子領域１７が突出部４２から上方に突出した状態である。座金１６は、ストレート部１２に挿通され、一側及び他側が頭部１３及び突出部４１にそれぞれ面接触し、ナット１１は、雄螺子領域１７に装着されて突出部４２に密着している。 As shown in FIG. 6, a protruding portion 41 provided in the circumferential direction (long in the circumferential direction) is formed in a part of the outer peripheral region of the sleeve 40, and the worm foil 39 comes into close contact with the protruding portion 41 from above. It has a protruding portion 42. The protrusions 41 and 42 are fixed by a plurality of fixtures 10 in close contact with each other.
The bolt 14 is in a state in which the head portion 13 is arranged on the lower side, the straight portion 12 vertically penetrates the protruding portions 41 and 42 that are in close contact with each other, and the male screw region 17 protrudes upward from the protruding portion 42. .. The washer 16 is inserted through the straight portion 12, one side and the other side are in surface contact with the head portion 13 and the protruding portion 41, respectively, and the nut 11 is attached to the male screw region 17 and is in close contact with the protruding portion 42.

固定具１０は、傾斜面２０及び縮径領域１９が面接触しており（図１（Ｂ）参照）、座金１６からボルト１４に対し、傾斜面２０の貫通孔１５の周りの全周で、傾斜面２０に垂直な力が作用している。
従って、弁体３２を開閉する際、仮にボルト１４に対し力が作用して、縮径領域１９の一部が傾斜面２０から離れた状態になったとしても、ボルト１４は、瞬時に縮径領域１９の全体が傾斜面２０に密着した状態に戻ることができ、ボルト１４の破損を抑制可能である。 In the fixture 10, the inclined surface 20 and the reduced diameter region 19 are in surface contact with each other (see FIG. 1 (B)), and the washer 16 to the bolt 14 are all around the circumference of the through hole 15 of the inclined surface 20. A force perpendicular to the inclined surface 20 is acting.
Therefore, when opening and closing the valve body 32, even if a force acts on the bolt 14 and a part of the diameter reduction region 19 is separated from the inclined surface 20, the diameter of the bolt 14 is instantly reduced. The entire region 19 can be returned to a state of being in close contact with the inclined surface 20, and damage to the bolt 14 can be suppressed.

以上、本発明の実施の形態を説明したが、本発明は、上記した形態に限定されるものでなく、要旨を逸脱しない条件の変更等は全て本発明の適用範囲である。
例えば、ボルトはリーマボルトである必要はなく、ボルトの雄螺子領域はストレート部全体に形成されていてもよい。
また、ボルトの頭部に六角穴を設ける必要はなく、例えば、頭部の外周を六角形にしてもよい。バルブアクチュエータの動力伝達機構において、座金の他側をスリーブ（の突出部）に接触させたが、ウォームホイル（の突出部）に接触させることもできる。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not deviate from the gist are within the scope of the present invention.
For example, the bolt does not have to be a reamer bolt, and the male screw region of the bolt may be formed over the entire straight portion.
Further, it is not necessary to provide a hexagonal hole in the head of the bolt, and for example, the outer circumference of the head may be hexagonal. In the power transmission mechanism of the valve actuator, the other side of the washer is brought into contact with the sleeve (protruding portion), but it can also be brought into contact with the worm foil (protruding portion).

１０：固定具、１１：ナット、１２：ストレート部、１３：頭部、１４：ボルト、１５：貫通孔、１６：座金、１７：雄螺子領域、１８：六角穴、１９：縮径領域、２０：傾斜面、２１、２２：部材、２３：平面部、２４：貫通孔、２５：平面部、２６：貫通孔、２７：穴、３０：バルブアクチュエータ、３１：駆動源、３２：弁体、３３：動力伝達機構、３４：枠体、３５：カバー体、３６：シャフト、３７：ウォーム、３８：歯部、３９：ウォームホイル、４０：スリーブ、４１、４２：突出部 10: Fixture, 11: Nut, 12: Straight part, 13: Head, 14: Bolt, 15: Through hole, 16: Washer, 17: Male screw area, 18: Hexagonal hole, 19: Reduced diameter area, 20 : Inclined surface, 21, 22: Member, 23: Flat part, 24: Through hole, 25: Flat part, 26: Through hole, 27: Hole, 30: Valve actuator, 31: Drive source, 32: Valve body, 33 : Power transmission mechanism, 34: Frame body, 35: Cover body, 36: Shaft, 37: Warm, 38: Teeth, 39: Warm foil, 40: Sleeve, 41, 42: Protruding part

Claims (4)

ナットと、
前記ナットが装着されるストレート部、及び、該ストレート部に連結された頭部を有するボルトと、
前記ストレート部が挿通する貫通孔が中央に形成され、外縁側から該貫通孔に向かって一定の割合で下り傾斜した傾斜面を一側に有する座金とを備え、
前記傾斜面は、前記貫通孔の周りに全周にわたって設けられ、傾斜角度が２０°〜５０°の範囲であり、
前記頭部の前記ストレート部側には、該ストレート部に向かって一定の割合で縮径して、前記傾斜面に面接触する縮径領域が形成され、前記ストレート部を曲げる向きの外力が前記ボルトに作用して前記縮径領域の一部が前記傾斜面から離れた状態は、前記座金から前記ボルトに作用する前記傾斜面に垂直な力により、該縮径領域の全体が該傾斜面に面接触する状態に戻されることを特徴とする固定具。 With nuts
A straight portion to which the nut is mounted, and a bolt having a head connected to the straight portion.
A washer having a through hole through which the straight portion is inserted is formed in the center, and has an inclined surface on one side that is inclined downward at a constant ratio from the outer edge side toward the through hole.
The inclined surface is provided all around the through hole, and the inclination angle is in the range of 20 ° to 50 °.
On the straight portion side of the head, a reduced diameter region is formed in which the diameter is reduced toward the straight portion at a constant ratio to make surface contact with the inclined surface, and an external force in the direction of bending the straight portion is applied. When a part of the reduced diameter region is separated from the inclined surface by acting on the bolt, the entire reduced diameter region becomes the inclined surface by a force perpendicular to the inclined surface acting on the bolt from the washer. A fixture characterized by being returned to a state of surface contact. 請求項１記載の固定具において、駆動源の駆動力を弁体に伝える動力伝達機構を有するバルブアクチュエータの該動力伝達機構が具備するウォームホイルを、円筒状のスリーブの外周に固定することを特徴とする固定具。 The fixture according to claim 1 is characterized in that a worm foil provided by the power transmission mechanism of a valve actuator having a power transmission mechanism for transmitting the driving force of a drive source to a valve body is fixed to the outer periphery of a cylindrical sleeve. Fixture. 請求項１又は２記載の固定具において、前記ボルトはリーマボルトであることを特徴とする固定具。 The fixture according to claim 1 or 2, wherein the bolt is a reamer bolt. 駆動源と、前記駆動源の駆動力を弁体に伝える動力伝達機構とを有して、前記弁体を開閉するバルブアクチュエータにおいて、
前記動力伝達機構は、ウォームと、前記ウォームに噛み合ったウォームホイルと、外周に前記ウォームホイルが取り付けられた円筒状のスリーブと、前記ウォームホイルを前記スリーブに固定する固定具とを具備し、
前記固定具は、ナットと、前記スリーブの一部及び前記ウォームホイルを貫通し、前記ナットが装着されたストレート部、及び、該ストレート部に連結された頭部を有するボルトと、前記ストレート部が挿通する貫通孔が中央に形成され、外縁側から該貫通孔に向かって一定の割合で下り傾斜した傾斜面を一側に有し、他側が前記ウォームホイル又は前記スリーブに接触する座金とを備え、
前記傾斜面は、前記貫通孔の周りに全周にわたって設けられ、傾斜角度が２０°〜５０°の範囲であり、
前記頭部の前記ストレート部側には、該ストレート部に向かって一定の割合で縮径して、前記傾斜面に面接触した縮径領域が形成され、前記ストレート部を曲げる向きの外力が前記ボルトに作用して前記縮径領域の一部が前記傾斜面から離れた状態は、前記座金から前記ボルトに作用する前記傾斜面に垂直な力により、該縮径領域の全体が該傾斜面に面接触する状態に戻されることを特徴とするバルブアクチュエータ。 In a valve actuator that has a drive source and a power transmission mechanism that transmits the driving force of the drive source to the valve body and opens and closes the valve body.
The power transmission mechanism includes a worm, a worm foil that meshes with the worm, a cylindrical sleeve having the worm foil attached to the outer periphery thereof, and a fixture for fixing the worm foil to the sleeve.
The fixture includes a nut, a straight portion penetrating a part of the sleeve and the worm foil, and a straight portion to which the nut is mounted, a bolt having a head connected to the straight portion, and the straight portion. A through hole to be inserted is formed in the center, and one side has an inclined surface that is inclined downward from the outer edge side toward the through hole at a constant ratio, and the other side is provided with a washer that contacts the worm foil or the sleeve. ,
The inclined surface is provided all around the through hole, and the inclination angle is in the range of 20 ° to 50 °.
On the straight portion side of the head, a reduced diameter region is formed in which the diameter is reduced toward the straight portion at a constant ratio and in surface contact with the inclined surface, and an external force in the direction of bending the straight portion is applied. When a part of the reduced diameter region is separated from the inclined surface by acting on the bolt, the entire reduced diameter region becomes the inclined surface by a force perpendicular to the inclined surface acting on the bolt from the washer. A valve actuator characterized in that it is returned to a surface contact state.
JP2017001696A 2017-01-10 2017-01-10 A fixture and a valve actuator comprising the fixture. Active JP6931532B2 (en)

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