JP2023049956A - Bent structure - Google Patents

Bent structure Download PDF

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JP2023049956A
JP2023049956A JP2021160033A JP2021160033A JP2023049956A JP 2023049956 A JP2023049956 A JP 2023049956A JP 2021160033 A JP2021160033 A JP 2021160033A JP 2021160033 A JP2021160033 A JP 2021160033A JP 2023049956 A JP2023049956 A JP 2023049956A
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coil portion
pitch
bending structure
axial direction
bending
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貴史 平田
Takashi Hirata
裕樹 保戸田
Hiroki Hotoda
正紘 稲葉
Masahiro Inaba
悠暉 早川
Yuki Hayakawa
雄太 石山
Yuta ISHIYAMA
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NHK Spring Co Ltd
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NHK Spring Co Ltd
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Abstract

To provide a bent structure of which flexural rigidity is partially changed in an axial direction with a simple structure.SOLUTION: A bent structure comprises an inner coil part 3 and an outer coil part 5, corresponding wound parts 7a, 9a of the inner coil part 3 are fitted between adjacent wound parts 15a, 17a, 19a of the outer coil part 5, and as a whole, bending and extension according to flexural rigidity are possible. By partially changing an amount of deflection against a load in an axial direction of at least one of the inner coil part 3 and the outer coil part 5, the flexural rigidity is partially changed in the axial direction.SELECTED DRAWING: Figure 2

Description

本発明は、ロボット等の関節機能部に供される屈曲構造体に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending structure provided for a joint function part of a robot or the like.

従来の屈曲構造体としては、例えば特許文献1のように、用途等に応じて軸方向で部分的に曲げ剛性を変化させるものがある。 As a conventional bending structure, for example, there is a structure in which the bending rigidity is partially changed in the axial direction according to the application, as disclosed in Patent Document 1.

特許文献1の屈曲構造体は、内視鏡の可撓管であり、コイルパイプと芯材とを備えた剛性可変装置を有する。剛性可変装置は、コイルパイプが屈曲する際の芯材の引張応力を高めることによって、可撓管の曲げ剛性を部分的に向上させる。 The bending structure disclosed in Patent Document 1 is a flexible tube of an endoscope, and has a rigidity variable device that includes a coil pipe and a core material. The rigidity variable device partially improves the bending rigidity of the flexible tube by increasing the tensile stress of the core material when the coil pipe is bent.

かかる屈曲構造体では、コイルパイプと芯材とを協働させる必要があるため、軸方向で部分的に剛性を向上させることはできても、構造が複雑になるという問題があった。 In such a bending structure, the coil pipe and the core material need to work together. Therefore, although the rigidity can be partially improved in the axial direction, the structure becomes complicated.

国際公開第2017/203740号公報International Publication No. 2017/203740

解決しようとする問題点は、軸方向で部分的に剛性を変化させる構造が複雑であった点である。 The problem to be solved is that the structure for partially changing the rigidity in the axial direction is complicated.

本発明は、内コイル部及び外コイル部を備え、前記外コイル部の隣接巻部間に前記内コイル部の対応する巻部が嵌合し全体として曲げ剛性に応じた屈曲及び伸展が可能であり、前記内コイル部及び前記外コイル部の少なくとも一方の軸方向の荷重に対する撓み量を部分的に変化させることにより、前記曲げ剛性を前記軸方向で部分的に変化させた屈曲構造体を提供する。 The present invention includes an inner coil portion and an outer coil portion, and the corresponding winding portions of the inner coil portion are fitted between the adjacent winding portions of the outer coil portion, so that bending and stretching are possible according to the bending rigidity as a whole. and providing a bending structure in which the bending rigidity is partially changed in the axial direction by partially changing the amount of deflection of at least one of the inner coil portion and the outer coil portion against the load in the axial direction. do.

本発明によれば、簡単な構造により軸方向で部分的に曲げ剛性を変化させることができる。 According to the present invention, it is possible to partially change the bending rigidity in the axial direction with a simple structure.

図1は、本発明の実施例1に係る屈曲構造体を示す断面図である。FIG. 1 is a cross-sectional view showing a bending structure according to Example 1 of the present invention. 図2は、図1の屈曲構造体の巻部断面を示す概略断面図である。FIG. 2 is a schematic cross-sectional view showing a winding section of the bending structure of FIG. 図3(A)及び(B)は、図2の屈曲構造体の内コイル部の巻部巻部断面を示す概略断面図であり、図3(A)は本体コイル部、図3(B)は副コイル部である。3A and 3B are schematic cross-sectional views showing cross sections of winding portions of the inner coil portion of the bending structure shown in FIG. is the sub-coil part. 図4(A)~(C)は、図2の屈曲構造体の外コイル部の巻部断面を示す概略断面図であり、図4(A)は本体コイル部、図4(B)及び(C)は副コイル部である。FIGS. 4A to 4C are schematic cross-sectional views showing cross sections of winding portions of the outer coil portion of the bending structure shown in FIG. C) is the sub-coil portion. 図5は、本発明の実施例2に係る屈曲構造体の巻部断面を示す概略断面図である。FIG. 5 is a schematic cross-sectional view showing a cross-section of a winding portion of a bending structure according to Example 2 of the present invention. 図6は、図5の内コイル部の巻部断面を示す概略断面図である。6 is a schematic cross-sectional view showing a cross-section of the winding portion of the inner coil portion of FIG. 5. FIG. 図7は、図5の外コイル部の巻部断面を示す概略断面図である。7 is a schematic cross-sectional view showing a cross-section of the winding portion of the outer coil portion of FIG. 5. FIG. 図8は、本発明の実施例3に係る屈曲構造体の巻部断面を示す概略断面図である。FIG. 8 is a schematic cross-sectional view showing a winding section of a bending structure according to Example 3 of the present invention. 図9(A)及び(B)は、図8の屈曲構造体の内コイル部の巻部断面を示す概略断面図であり、図9(A)は軟コイル部、図9(B)は硬コイル部である。9A and 9B are schematic cross-sectional views showing cross sections of winding portions of the inner coil portion of the bending structure shown in FIG. This is the coil section. 図10は、本発明の実施例4に係る屈曲構造体の巻部断面を拡大して示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing an enlarged cross-section of a winding portion of a bending structure according to Example 4 of the present invention. 図11(A)及び(B)は、図10の屈曲構造体の内コイル部の巻部断面を示す概略断面図であり、図11(A)は小径コイル部、図11(B)は大径コイル部である。11A and 11B are schematic cross-sectional views showing cross sections of winding portions of the inner coil portion of the bending structure shown in FIG. It is a diameter coil part.

簡単な構造により軸方向で部分的に曲げ剛性を変化させるという目的を、屈曲構造体を構成する内コイル部及び外コイル部の少なくとも一方において、軸方向の荷重に対する撓み量を部分的に変化させることにより実現した。 For the purpose of partially changing the bending rigidity in the axial direction with a simple structure, at least one of the inner coil portion and the outer coil portion constituting the bending structure is partially changed in the amount of deflection with respect to the load in the axial direction. It was realized by

すなわち、屈曲構造体(1)は、内コイル部(3)及び外コイル部(5)を備え、外コイル部(5)の隣接巻部(15a、17a、19a)間に内コイル部(3)の対応する巻部(7a、9a)が嵌合し、全体として曲げ剛性に応じた屈曲及び伸展が可能となっている。 That is, the bending structure (1) comprises an inner coil portion (3) and an outer coil portion (5), and between the adjacent winding portions (15a, 17a, 19a) of the outer coil portion (5), the inner coil portion (3) ) are fitted to each other, so that bending and stretching are possible according to the bending rigidity as a whole.

この屈曲構造体(1)は、内コイル部(3)及び外コイル部(5)の少なくとも一方の軸方向の荷重に対する撓み量を部分的に変化させることにより、曲げ剛性が軸方向で部分的に変化している。 In this bending structure (1), the bending rigidity is partially increased in the axial direction by partially changing the amount of bending of at least one of the inner coil portion (3) and the outer coil portion (5) against the load in the axial direction. is changing to

内コイル部(3)及び外コイル部(5)の少なくとも一方は、部分的にピッチが軸方向に拡げられた本体コイル部(7)と、本体コイル部(7)の拡げられたピッチ内に巻部(9a)が位置する一又は複数の副コイル部(9)とを備えた構成としてもよい。この場合、副コイル部(9)は、本体コイル部(7)の拡げられたピッチと同一ピッチとしてもよい。ただし、副コイル部(9)のピッチは、本体コイル部(7)の拡げられたピッチと同一である必要はない。 At least one of the inner coil portion (3) and the outer coil portion (5) is composed of a body coil portion (7) whose pitch is partially widened in the axial direction, and within the widened pitch of the body coil portion (7). It is good also as composition provided with one or a plurality of subcoil parts (9) where winding part (9a) is located. In this case, the secondary coil portion (9) may have the same pitch as the widened pitch of the main coil portion (7). However, the pitch of the sub-coil portion (9) need not be the same as the expanded pitch of the main coil portion (7).

内コイル部(3)及び外コイル部(5)の少なくとも一方は、部分的にピッチが軸方向に狭く形成され、外コイル部(5)の隣接巻部(15a)間への内コイル部(3)の巻部(23a)の嵌合により、狭く形成されたピッチが拡げられて初張力が付与される構成としてもよい。 At least one of the inner coil portion (3) and the outer coil portion (5) is partially narrowed in pitch in the axial direction, and the inner coil portion ( 3) By fitting the winding portion (23a), the narrow pitch may be widened to apply an initial tension.

内コイル部(3)及び外コイル部(5)の少なくとも一方は、相対的に柔らかい材質の軟コイル部(25)と、相対的に硬い材質の硬コイル部(27)とを備えた構成としてもよい。 At least one of the inner coil portion (3) and the outer coil portion (5) is configured to include a soft coil portion (25) made of a relatively soft material and a hard coil portion (27) made of a relatively hard material. good too.

内コイル部(3)及び外コイル部(5)の少なくとも一方は、相対的に巻部(29a)の線径が小径の小径コイル部(29)と、相対的に巻部(31a)の線径が大径の大径コイル部(31)とを備えた構成としてもよい。 At least one of the inner coil portion (3) and the outer coil portion (5) is composed of a small diameter coil portion (29) having a relatively small wire diameter of the winding portion (29a) and a relatively small wire diameter of the winding portion (31a). A large-diameter coil portion (31) having a large diameter may be provided.

図1は、本発明の実施例1に係る屈曲構造体を示す断面図、図2は、屈曲構造体の巻部断面を示す概略断面図である。 FIG. 1 is a cross-sectional view showing a bending structure according to Example 1 of the present invention, and FIG. 2 is a schematic cross-sectional view showing a winding section of the bending structure.

屈曲構造体1は、マニピュレーター、ロボット、アクチュエーター等の医療用や産業用等の各種の機器の関節機能部に適用されるものであり、屈曲・伸展動作によって両側に結合された機器側の部材を相対的に変位可能とする。 The bending structure 1 is applied to the joint function parts of various devices such as manipulators, robots, and actuators for medical and industrial purposes. Relatively displaceable.

本実施例の屈曲構造体1は、内コイル部3及び外コイル部5を備え、軸方向で部分的に剛性が変化するように構成されている。軸方向とは、屈曲構造体1の軸心に沿った方向を意味し、厳格に解する必要はなく、軸心に対して僅かに傾斜した方向も含む。 The bending structure 1 of this embodiment includes an inner coil portion 3 and an outer coil portion 5, and is configured such that the rigidity thereof varies partially in the axial direction. The axial direction means a direction along the axis of the bending structure 1, and does not need to be interpreted strictly, and includes directions slightly inclined with respect to the axis.

本実施例の屈曲構造体1では、内コイル部3及び外コイル部5の双方において、軸方向の荷重に対する撓み量を部分的に変化させることにより、部分的に曲げ剛性が変化している。 In the bending structure 1 of this embodiment, both the inner coil portion 3 and the outer coil portion 5 partially change the bending rigidity by partially changing the amount of bending against the load in the axial direction.

なお、屈曲構造体1の曲げ剛性を部分的に変化させるには、内コイル部3及び外コイル部5の少なくとも一方において、軸方向の荷重に対する撓み量を部分的に変化させればよい。 In order to partially change the flexural rigidity of the bending structure 1, at least one of the inner coil portion 3 and the outer coil portion 5 should be partially changed in the amount of deflection against the load in the axial direction.

この屈曲構造体1は、全体として曲げ剛性に応じた屈曲及び伸展が可能となっており、相対的に曲げ剛性が高い部分が屈曲し難くなっている。 The bending structure 1 as a whole is capable of bending and extending according to the bending rigidity, and the portion having relatively high bending rigidity is difficult to bend.

図3(A)及び(B)は、屈曲構造体1の内コイル部3の巻部断面を示す概略断面図であり、図3(A)は本体コイル部7、図3(B)は副コイル部9である。 3A and 3B are schematic cross-sectional views showing cross sections of winding portions of the inner coil portion 3 of the bending structure 1. FIG. 3A is the main body coil portion 7, and FIG. It is the coil part 9 .

内コイル部3は、図2及び図3のように、本体コイル部7と、副コイル部9とを備えている。 The inner coil portion 3 includes a main coil portion 7 and a sub-coil portion 9 as shown in FIGS. 2 and 3 .

本体コイル部7は、金属や樹脂等の弾性を有する不等ピッチコイルばねであり、軸方向の一側が小ピッチ部11、同他側が大ピッチ部13となっている。 The body coil portion 7 is an elastic unequal pitch coil spring made of metal, resin, or the like, and has a small pitch portion 11 on one side in the axial direction and a large pitch portion 13 on the other side.

小ピッチ部11は、相対的に小さい一定のピッチを有し、大ピッチ部13は、相対的に大きい一定のピッチを有する。従って、本体コイル部7は、第ピッチ部13において、部分的にピッチが軸方向に拡げられた構成となっている。なお、ピッチは、本体コイル部7の隣接する巻部7a間の軸方向の隙間である。 The small pitch portion 11 has a relatively small constant pitch, and the large pitch portion 13 has a relatively large constant pitch. Therefore, the body coil portion 7 has a configuration in which the pitch is partially expanded in the axial direction at the first pitch portion 13 . The pitch is the axial gap between adjacent winding portions 7a of the body coil portion 7. As shown in FIG.

本体コイル部7は、巻部7aの断面形状が円形であり、線径が一定となっている。なお、本体コイル部7の材質、巻部7aの断面形状や線径等は、適宜のものを採用すればよい。 The body coil portion 7 has a winding portion 7a with a circular cross-sectional shape and a constant wire diameter. Note that the material of the body coil portion 7, the cross-sectional shape and wire diameter of the winding portion 7a, and the like may be appropriately selected.

本体コイル部7の中心径は、小ピッチ部11及び大ピッチ部13で一定になっている。ただし、本体コイル部7の中心径は、軸方向で変化させることも可能である。 The center diameter of the body coil portion 7 is constant between the small pitch portion 11 and the large pitch portion 13 . However, the center diameter of the body coil portion 7 can also be changed in the axial direction.

副コイル部9は、金属や樹脂等の弾性を有するコイルばねである。副コイル部9は、本体コイル部7の拡げられたピッチ、つまり大ピッチ部13と同一ピッチとなっている。副コイル部9の中心径は、本体コイル部7と同一である。 The sub-coil portion 9 is an elastic coil spring made of metal, resin, or the like. The secondary coil portion 9 has the same pitch as the widened pitch of the main body coil portion 7 , that is, the pitch of the large pitch portion 13 . The center diameter of the sub-coil portion 9 is the same as that of the main body coil portion 7 .

この副コイル部9は、巻部9aが本体コイル部7の大ピッチ部13のピッチ内に位置している。副コイル部9の巻部9aの位置は、本体コイル部7の隣接巻部7a間の中間である。 The secondary coil portion 9 has a winding portion 9 a positioned within the pitch of the large pitch portion 13 of the main coil portion 7 . The position of the winding portion 9 a of the sub coil portion 9 is in the middle between the adjacent winding portions 7 a of the main coil portion 7 .

これにより、内コイル部3の他側である副コイル部9と大ピッチ部13との組み合わせ部分は、小ピッチ部11と同一のピッチを有する。すなわち、内コイル部3は、全体として一定のピッチを有する。 As a result, the combined portion of the secondary coil portion 9 and the large pitch portion 13 on the other side of the inner coil portion 3 has the same pitch as the small pitch portion 11 . That is, the inner coil portion 3 has a constant pitch as a whole.

また、内コイル部3は、副コイル部9及び大ピッチ部13のピッチがそれぞれ拡がっていることにより、軸方向の一側よりも軸方向の他側での荷重に対する撓み量が小さくなっている。これにより、内コイル部3は、曲げ剛性が向上している。 In the inner coil portion 3, the pitches of the sub-coil portion 9 and the large-pitch portion 13 are widened, respectively, so that the deflection amount against the load on the other side in the axial direction is smaller than that on the one side in the axial direction. . Thereby, the bending rigidity of the inner coil portion 3 is improved.

なお、副コイル部9と大ピッチ部13との組み合わせは、小ピッチ部11と同一のピッチを有する必要はないので、小ピッチ部11よりも小さいピッチであってもよい。 The combination of the sub-coil portion 9 and the large pitch portion 13 does not need to have the same pitch as the small pitch portion 11 , so the pitch may be smaller than that of the small pitch portion 11 .

図4(A)~(C)は、図2の屈曲構造体の外コイル部の巻部断面を示す概略断面図であり、図4(A)は本体コイル部、図4(B)及び(C)は副コイル部である。 FIGS. 4A to 4C are schematic cross-sectional views showing cross sections of winding portions of the outer coil portion of the bending structure shown in FIG. C) is the sub-coil portion.

外コイル部5は、図2及び図4のように、本体コイル部15と、副コイル部17、19とを備えている。 The outer coil section 5 includes a main coil section 15 and sub-coil sections 17 and 19, as shown in FIGS.

本体コイル部15は、金属や樹脂等の弾性を有するコイルばねである。本体コイル部15は、内コイル部3の小ピッチ部11と同一のピッチを有し、巻部15aの断面形状が円形であり、線径が一定となっている。なお、本体コイル部15の材質、巻部15aの断面形状や線径等は、適宜のものを採用すればよい。 The body coil portion 15 is an elastic coil spring made of metal, resin, or the like. The main body coil portion 15 has the same pitch as the small pitch portion 11 of the inner coil portion 3, the winding portion 15a has a circular cross-sectional shape, and a constant wire diameter. Note that the material of the body coil portion 15, the cross-sectional shape and wire diameter of the winding portion 15a, and the like may be appropriately selected.

本体コイル部15は、中心径が内コイル部3よりも大きく形成されており、内コイル部3の小ピッチ部11の外側に螺合されている。これにより、本体コイル部15の巻部15aが、内コイル部3の小ピッチ部11の巻部7a間に嵌合する。 The body coil portion 15 has a center diameter larger than that of the inner coil portion 3 and is screwed to the outside of the small pitch portion 11 of the inner coil portion 3 . As a result, the winding portion 15 a of the main body coil portion 15 is fitted between the winding portions 7 a of the small pitch portion 11 of the inner coil portion 3 .

副コイル部17、19は、金属や樹脂等の弾性を有するコイルばねである。副コイル部17、19は、内コイル部3の本体コイル部7の大ピッチ部13と同一ピッチとなっている。副コイル部17、19の中心径は、外コイル部5の本体コイル部15と同一である。 The sub-coil portions 17 and 19 are elastic coil springs made of metal, resin, or the like. The sub-coil portions 17 and 19 have the same pitch as the large pitch portion 13 of the main coil portion 7 of the inner coil portion 3 . The center diameters of the sub-coil portions 17 and 19 are the same as that of the main body coil portion 15 of the outer coil portion 5 .

これら副コイル部17、19は、内コイル部3の他側である大ピッチ部13と副コイル部9との組み合わせ部分の外側に螺合されている。これら副コイル部17、19の巻部17a、19aは、それぞれ内コイル部3の巻部7a、9a間に嵌合している。 These sub-coil portions 17 and 19 are screwed to the outside of the combined portion of the large-pitch portion 13 and the sub-coil portion 9 on the other side of the inner coil portion 3 . The winding portions 17a and 19a of the sub-coil portions 17 and 19 are fitted between the winding portions 7a and 9a of the inner coil portion 3, respectively.

副コイル部17、19は、それらの組合せによって本体コイル部15と同一のピッチを有する。従って、外コイル部5は、全体として一定のピッチを有する。 The secondary coil portions 17 and 19 have the same pitch as the main coil portion 15 due to their combination. Therefore, the outer coil section 5 has a constant pitch as a whole.

また、外コイル部5は、副コイル部17、19の2条で形成されることにより、軸方向の一側よりも軸方向の他側での荷重に対する撓み量が小さくなっている。これにより、外コイル部5の副コイル部17、19に相当する箇所は、本体コイル部15に相当する箇所に対して曲げ剛性が向上している。 In addition, since the outer coil portion 5 is formed of the two sub-coil portions 17 and 19, the deflection amount against the load on the other side in the axial direction is smaller than that on the one side in the axial direction. As a result, the portions corresponding to the sub-coil portions 17 and 19 of the outer coil portion 5 have improved bending rigidity compared to the portion corresponding to the main body coil portion 15 .

なお、副コイル部17、19は、本体コイル部15と同一のピッチを有する必要はないので、本体コイル部15よりも小さいピッチであってもよい。 Since the sub-coil portions 17 and 19 do not need to have the same pitch as the main coil portion 15 , the pitch may be smaller than that of the main coil portion 15 .

また、外コイル部5と内コイル部3の構成は逆にしてもよい。内コイル部3及び外コイル部5の少なくとも一方において、軸方向の荷重に対する撓み量を部分的に変化させればよいので、外コイル部5又は内コイル部3を軸方向の一側から他側まで連続する等ピッチのコイルばね等によって構成してもよい。 Also, the configurations of the outer coil portion 5 and the inner coil portion 3 may be reversed. In at least one of the inner coil portion 3 and the outer coil portion 5, the deflection amount against the load in the axial direction may be partially changed. It may be configured by a coil spring or the like with an equal pitch that continues up to.

かかる外コイル部5が全体として内コイル部3の外側に螺合していることにより、簡単な構造で軸方向の一部の曲げ剛性を変化させることができる。 Since the outer coil portion 5 as a whole is screwed to the outside of the inner coil portion 3, it is possible to partially change the flexural rigidity in the axial direction with a simple structure.

また、外コイル部5と内コイル部3との螺合により、外コイル部5の一側の巻部15a間及び他側の巻部17a、19a間に内コイル部3の対応する巻部7a又は9aが嵌合している。 Further, by screwing the outer coil portion 5 and the inner coil portion 3 together, the corresponding winding portions 7a of the inner coil portion 3 are connected between the winding portions 15a on one side of the outer coil portion 5 and between the winding portions 17a and 19a on the other side of the outer coil portion 5. Or 9a is fitted.

この構造により、屈曲構造体1は、軸方向の圧縮に耐え得るものとなっている。また、屈曲構造体1は、屈曲時において、屈曲の内側で外コイル部5の隣接する巻部15a、17a、及び19a間の隙間が小さくなり、屈曲の外側で外コイル部5の隣接する巻部15a、17a、及び19a間の隙間が大きくなる。従って、屈曲時の外コイル部5の軸心における長さが直状時と比較して変化しないようになっている。 This structure allows the bending structure 1 to withstand compression in the axial direction. In addition, when the bending structure 1 is bent, the gaps between the adjacent winding portions 15a, 17a, and 19a of the outer coil portion 5 on the inner side of the bending become smaller, and the adjacent windings of the outer coil portion 5 on the outer side of the bending. The gap between portions 15a, 17a and 19a is increased. Therefore, the length of the outer coil portion 5 at the axial center when bent does not change compared to when it is straight.

このため、屈曲構造体1は、その内周側にプッシュプルケーブル等の可撓部材を軸方向で移動可能にガイドするように用いる場合、可撓部材の経路長を一定に保つことができる。 Therefore, when the bending structure 1 is used to guide a flexible member such as a push-pull cable on its inner peripheral side so as to be movable in the axial direction, the path length of the flexible member can be kept constant.

また、本実施例の屈曲構造体1は、軸方向の一側の曲げ剛性が相対的に低く、軸方向の他側の曲げ剛性が相対的に高いので、例えば内視鏡に適用するような場合に挿入性を高めることができる。 In addition, the bending structure 1 of this embodiment has a relatively low bending rigidity on one side in the axial direction and a relatively high bending rigidity on the other side in the axial direction. In some cases, insertability can be improved.

なお、本実施例では、屈曲構造体1の一部分である他側の剛性を向上させたのみであるが、軸方向の複数個所において剛性を向上させてもよい。 In this embodiment, only the other side, which is a part of the bending structure 1, is improved in rigidity, but the rigidity may be improved in a plurality of locations in the axial direction.

図5は、本発明の実施例2に係る屈曲構造体の巻部断面を示す概略断面図、図6は、屈曲構造体の内コイル部の巻部断面を示す概略断面図、図7は、屈曲構造体の外コイル部の巻部断面を示す概略断面図である。なお、実施例2では、基本構成が実施例1と共通するため、対応する構成に同符号を付して重複した説明を省略する。 FIG. 5 is a schematic cross-sectional view showing a cross section of the winding portion of the bending structure according to Example 2 of the present invention, FIG. 6 is a schematic cross-sectional view showing a cross section of the winding portion of the inner coil portion of the bending structure, and FIG. FIG. 4 is a schematic cross-sectional view showing a cross-section of a winding portion of an outer coil portion of a bending structure; In addition, since the basic configuration of the second embodiment is common to that of the first embodiment, the same reference numerals are given to the corresponding configurations, and redundant explanations are omitted.

実施例2では、内コイル部3のピッチが部分的に狭く形成されたものである。すなわち、内コイル部3は、軸方向の一側の一側コイル部21と軸方向の他側の他側コイル部23とを備えたコイルばねで構成したものである。外コイル部5は、軸方向の一側から他側にわたって等ピッチのコイルばねからなる。その他は、実施例1と同一である。 In Example 2, the pitch of the inner coil portion 3 is partially narrowed. That is, the inner coil portion 3 is composed of a coil spring having a one-side coil portion 21 on one side in the axial direction and a other-side coil portion 23 on the other side in the axial direction. The outer coil portion 5 is composed of a coil spring with an equal pitch from one side to the other side in the axial direction. Others are the same as the first embodiment.

内コイル部3の一側コイル部21は、等ピッチのコイルばねからなり、外コイル部5と同一ピッチとなっている。他側コイル部23は、密着コイルばねからなり、軸方向で隣接する巻部23aが相互に密着している。つまり、他側コイル部23は、ピッチが狭く形成されている。一側コイル部21と他側コイル部23とは、一体に連続している。 The one-side coil portion 21 of the inner coil portion 3 is made of a coil spring with an equal pitch, and has the same pitch as the outer coil portion 5 . The other side coil portion 23 is made of a tight coil spring, and axially adjacent winding portions 23a are in tight contact with each other. That is, the other side coil portion 23 is formed with a narrow pitch. The one-side coil portion 21 and the other-side coil portion 23 are integrally continuous.

なお、他側コイル部23は、一側コイル部21よりもピッチが狭ければ、密着コイルばねでなくてもよい。また、一側コイル部21のピッチは、外コイル部5のピッチよりも小さくしてもよい。逆に、外コイル部5のピッチを内コイル部3の一側コイル部21のピッチより小さくしてもよい。また、外コイル部5と内コイル部3の構成は逆にしてもよい。また、軸方向複数個所においてピッチを狭くしてもよい。 Note that the other-side coil portion 23 may not be a tight coil spring as long as the pitch is narrower than that of the one-side coil portion 21 . Also, the pitch of the one-side coil portion 21 may be smaller than the pitch of the outer coil portion 5 . Conversely, the pitch of the outer coil portion 5 may be smaller than the pitch of the one-side coil portion 21 of the inner coil portion 3 . Also, the configurations of the outer coil portion 5 and the inner coil portion 3 may be reversed. Also, the pitch may be narrowed at a plurality of locations in the axial direction.

この屈曲構造体1では、内コイル部3と外コイル部5とが螺合し、外コイル部5の巻部15a間へ内コイル部3の巻部23aが嵌合することにより、内コイル部3の他側コイル部23の巻部23a間の狭く形成されたピッチが拡げられる。これにより、外コイル部5の巻部15a間に内コイル部3の巻部23aが付勢により相対的に高い摩擦力をもって密着する。 In this bending structure 1, the inner coil portion 3 and the outer coil portion 5 are screwed together, and the winding portion 23a of the inner coil portion 3 is fitted between the winding portions 15a of the outer coil portion 5, whereby the inner coil portion The narrow pitch between the winding portions 23a of the other side coil portion 23 of No. 3 is widened. As a result, the winding portions 23a of the inner coil portion 3 are urged to closely contact the winding portions 15a of the outer coil portion 5 with a relatively high frictional force.

この結果、屈曲構造体1の他側は、初張力が付与され、曲げ剛性が向上する。従って、本実施例でも、簡単な構造で軸方向の一部の曲げ剛性を変化させることができる。 As a result, an initial tension is applied to the other side of the bending structure 1, and bending rigidity is improved. Therefore, also in this embodiment, it is possible to partially change the flexural rigidity in the axial direction with a simple structure.

なお、実施例1の構造でも、実施例2のように、内コイル部3等のピッチを小さくしてもよいことは上記のとおりである。 As described above, even in the structure of the first embodiment, the pitch of the inner coil portions 3 and the like may be reduced as in the second embodiment.

図8は、本発明の実施例3に係る屈曲構造体の巻部断面を示す概略断面図、図9(A)及び(B)は、屈曲構造体の内コイル部の巻部断面を示す概略断面図であり、図9(A)は軟コイル部、図9(B)は硬コイル部である。なお、実施例3では、基本構成が実施例1と共通するため、対応する構成に同符号を付して重複した説明を省略する。 8 is a schematic cross-sectional view showing a winding section of a bending structure according to Example 3 of the present invention, and FIGS. 9A and 9B are schematic cross-sections showing a winding section of an inner coil section of the bending structure. It is sectional drawing, FIG.9(A) is a soft coil part, FIG.9(B) is a hard coil part. In addition, since the basic configuration of the third embodiment is common to that of the first embodiment, the same reference numerals are given to the corresponding configurations, and redundant explanations are omitted.

実施例3では、内コイル部3を軸方向の一側の軟コイル部25と軸方向の他側の硬コイル部27とを備えたコイルばねで構成したものである。 In Example 3, the inner coil portion 3 is configured by a coil spring having a soft coil portion 25 on one side in the axial direction and a hard coil portion 27 on the other side in the axial direction.

軟コイル部25及び硬コイル部27は、等ピッチのコイルばねであるが、材質が異なる。すなわち、軟コイル部25は、相対的に柔らかい材質からなり、硬コイル部27は、相対的に硬い材質からなる。 The soft coil portion 25 and the hard coil portion 27 are coil springs with an equal pitch, but are made of different materials. That is, the soft coil portion 25 is made of a relatively soft material, and the hard coil portion 27 is made of a relatively hard material.

この材質の違いにより、硬コイル部27は、軟コイル部25よりも軸方向の荷重に対する撓み量が小さい。 Due to this difference in material, the hard coil portion 27 flexes less than the soft coil portion 25 with respect to an axial load.

外コイル部5は、軸方向の一側から他側にわたって等ピッチのコイルばねからなる。その他は、実施例1と同一である。 The outer coil portion 5 is composed of a coil spring with an equal pitch from one side to the other side in the axial direction. Others are the same as the first embodiment.

従って、本実施例でも、内コイル部3と外コイル部5とが螺合することにより、簡単な構造で軸方向の一部の曲げ剛性を変化させることができる。 Therefore, in this embodiment as well, by screwing the inner coil portion 3 and the outer coil portion 5 together, it is possible to partially change the flexural rigidity in the axial direction with a simple structure.

なお、軟コイル部25を軸方向の他側に設け、硬コイル部27を軸方向の一側に設けてもよい。また、外コイル部5と内コイル部3の構成は逆にしてもよい。また、外コイル部5と内コイル部3の双方に、軟コイル部及び硬コイル部を設けてもよい。さらに、軸方向複数個所に軟コイル部及び硬コイル部の一方又は双方を設けてもよい。 The soft coil portion 25 may be provided on the other side in the axial direction, and the hard coil portion 27 may be provided on the one side in the axial direction. Also, the configurations of the outer coil portion 5 and the inner coil portion 3 may be reversed. Also, both the outer coil portion 5 and the inner coil portion 3 may be provided with a soft coil portion and a hard coil portion. Furthermore, one or both of the soft coil portion and the hard coil portion may be provided at a plurality of locations in the axial direction.

また、実施例1において、実施例3と同様に、副コイル部9、17、19等を硬コイル部としてもよい。また、実施例2においても、他側コイル部23を硬コイル部として、一側コイル部21に溶接等によって結合することも可能である。 Further, in the first embodiment, as in the third embodiment, the sub-coil portions 9, 17, 19, etc. may be hard coil portions. Also in the second embodiment, it is possible to make the other side coil portion 23 a hard coil portion and connect it to the one side coil portion 21 by welding or the like.

図10は、本発明の実施例4に係る屈曲構造体の巻部断面を示す概略断面図、図11(A)及び(B)は、屈曲構造体の内コイル部の巻部断面を示す概略断面図であり、図11(A)は小径コイル部、図11(B)は大径コイル部である。なお、実施例4では、基本構成が実施例1と共通するため、対応する構成に同符号を付して重複した説明を省略する。 10 is a schematic cross-sectional view showing a winding section of a bending structure according to Example 4 of the present invention, and FIGS. 11A and 11B are schematic cross-sections showing a winding section of an inner coil section of the bending structure. It is sectional drawing, FIG.11(A) is a small diameter coil part, FIG.11(B) is a large diameter coil part. In addition, since the basic configuration of the fourth embodiment is common to that of the first embodiment, the same reference numerals are given to the corresponding configurations, and redundant explanations will be omitted.

実施例4では、内コイル部3を軸方向の一側の小径コイル部29と軸方向の他側の大径コイル部31とを備えたコイルばねで構成したものである。 In Example 4, the inner coil portion 3 is configured by a coil spring having a small-diameter coil portion 29 on one side in the axial direction and a large-diameter coil portion 31 on the other side in the axial direction.

小径コイル部29及び大径コイル部31は、等ピッチのコイルばねであるが、巻部29a、31aの線径が異なる。すなわち、小径コイル部29は、相対的に巻部29aの線径が小径であり、大径コイル部31は、相対的に巻部31aの線径が大径である。 The small-diameter coil portion 29 and the large-diameter coil portion 31 are coil springs with an equal pitch, but the wire diameters of the winding portions 29a and 31a are different. That is, the small-diameter coil portion 29 has a winding portion 29a with a relatively small wire diameter, and the large-diameter coil portion 31 has a winding portion 31a with a relatively large wire diameter.

この線径の違いにより、大径コイル部31は、小径コイル部29よりも軸方向の荷重に対する撓み量が小さい。外コイル部5は、軸方向の一側から他側にわたって等ピッチのコイルばねからなる。その他は、実施例1と同一である。 Due to this difference in wire diameter, the large-diameter coil portion 31 flexes less than the small-diameter coil portion 29 against an axial load. The outer coil portion 5 is composed of a coil spring with an equal pitch from one side to the other side in the axial direction. Others are the same as the first embodiment.

従って、本実施例でも、内コイル部3と外コイル部5とが螺合することにより、簡単な構造で軸方向の一部の曲げ剛性を変化させることができる。 Therefore, in this embodiment as well, by screwing the inner coil portion 3 and the outer coil portion 5 together, it is possible to partially change the flexural rigidity in the axial direction with a simple structure.

なお、小径コイル部29を軸方向の他側に設け、大径コイル部31を軸方向の一側に設けてもよい。また、外コイル部5と内コイル部3の構成は逆にしてもよい。また、外コイル部5と内コイル部3の双方に、小径コイル部及び大径コイル部を設けてもよい。さらに、軸方向複数個所に小径コイル部及び大径コイル部の一方又は双方を設けてもよい。 The small-diameter coil portion 29 may be provided on the other side in the axial direction, and the large-diameter coil portion 31 may be provided on the one side in the axial direction. Also, the configurations of the outer coil portion 5 and the inner coil portion 3 may be reversed. Further, both the outer coil portion 5 and the inner coil portion 3 may be provided with a small diameter coil portion and a large diameter coil portion. Furthermore, one or both of the small-diameter coil portion and the large-diameter coil portion may be provided at a plurality of locations in the axial direction.

また、実施例1において、実施例3と同様に、副コイル部9、17、19等を大径コイル部としてもよい。また、実施例2において、他側コイル部23を硬コイル部として、一側コイル部21に溶接等によって結合することも可能である。さらに、実施例3において、硬コイル部27をさらに大径コイル部としてもよい。 Moreover, in Example 1, as in Example 3, the sub-coil portions 9, 17, 19, etc. may be large-diameter coil portions. Further, in the second embodiment, it is also possible to make the other side coil portion 23 a hard coil portion and combine it with the one side coil portion 21 by welding or the like. Furthermore, in Example 3, the hard coil portion 27 may be a large-diameter coil portion.

その他、実施例1~4の構造を適宜組み合わせて、屈曲構造体1の剛性を軸方向で変化させることが可能である。 In addition, by appropriately combining the structures of Examples 1 to 4, it is possible to change the rigidity of the bending structure 1 in the axial direction.

1 屈曲構造体
3 内コイル部
5 外コイル部
7 本体コイル部(内コイル部)
7a、9a 巻部
9 副コイル部(内コイル部)
11 小ピッチ部
13 大ピッチ部
15 本体コイル部
15a、17a、19a巻部
17、19 副コイル部(外コイル部)
25 軟コイル部
27 硬コイル部
29 小径コイル部
31 大径コイル部
1 bending structure 3 inner coil portion 5 outer coil portion 7 body coil portion (inner coil portion)
7a, 9a Winding portion 9 Sub-coil portion (inner coil portion)
11 Small pitch portion 13 Large pitch portion 15 Body coil portions 15a, 17a, 19a Winding portions 17, 19 Sub-coil portion (outer coil portion)
25 soft coil portion 27 hard coil portion 29 small diameter coil portion 31 large diameter coil portion

Claims (6)

内コイル部及び外コイル部を備え、
前記外コイル部の隣接巻部間に前記内コイル部の対応する巻部が嵌合し全体として曲げ剛性に応じた屈曲及び伸展が可能であり、
前記内コイル部及び前記外コイル部の少なくとも一方の軸方向の荷重に対する撓み量を部分的に変化させることにより、前記曲げ剛性を前記軸方向で部分的に変化させた、
屈曲構造体。
Equipped with an inner coil section and an outer coil section,
The corresponding winding portions of the inner coil portion are fitted between the adjacent winding portions of the outer coil portion, and the bending and stretching as a whole is possible according to the bending rigidity,
The bending rigidity is partially changed in the axial direction by partially changing the amount of deflection of at least one of the inner coil portion and the outer coil portion against the load in the axial direction,
bending structure.
請求項1記載の屈曲構造体であって、
前記内コイル部及び前記外コイル部の少なくとも一方は、部分的にピッチが前記軸方向に拡げられた本体コイル部と、前記本体コイル部の前記拡げられたピッチ内に巻部が位置する一又は複数の副コイル部とを備えた、
屈曲構造体。
The bending structure according to claim 1,
At least one of the inner coil portion and the outer coil portion includes a main body coil portion whose pitch is partially widened in the axial direction, and a winding portion positioned within the widened pitch of the main body coil portion. with a plurality of sub-coil parts,
bending structure.
請求項2記載の屈曲構造体であって、
前記副コイル部は、前記本体コイル部の前記拡げられたピッチと同一ピッチである、
屈曲構造体。
The bending structure according to claim 2,
The secondary coil portion has the same pitch as the expanded pitch of the main body coil portion,
bending structure.
請求項1~3の何れか一項に記載の屈曲構造体であって、
前記内コイル部及び前記外コイル部の少なくとも一方は、部分的にピッチが前記軸方向に狭く形成され、前記外コイル部の隣接巻部間への前記内コイル部の巻部の嵌合により前記狭く形成されたピッチが拡げられて初張力が付与される、
屈曲構造体。
The bending structure according to any one of claims 1 to 3,
At least one of the inner coil portion and the outer coil portion is partially formed with a narrow pitch in the axial direction, and the winding portions of the inner coil portion are fitted between the adjacent winding portions of the outer coil portion to form the coil. The narrowly formed pitch is widened and the initial tension is applied,
bending structure.
請求項1~4の何れか一項に記載の屈曲構造体であって、
前記内コイル部及び前記外コイル部の少なくとも一方は、相対的に柔らかい材質の軟コイル部と、相対的に硬い材質の硬コイル部とを備えた、
屈曲構造体。
The bending structure according to any one of claims 1 to 4,
At least one of the inner coil portion and the outer coil portion includes a soft coil portion made of a relatively soft material and a hard coil portion made of a relatively hard material,
bending structure.
請求項1~5の何れか一項に記載の屈曲構造体であって、
前記内コイル部及び前記外コイル部の少なくとも一方は、相対的に前記巻部の線径が小径の小径コイル部と、相対的に前記巻部の線径が大径の大径コイル部とを備えた、
屈曲構造体。
The bending structure according to any one of claims 1 to 5,
At least one of the inner coil portion and the outer coil portion includes a small-diameter coil portion having a relatively small wire diameter and a large-diameter coil portion having a relatively large wire diameter. prepared,
bending structure.
JP2021160033A 2021-09-29 2021-09-29 Bent structure Pending JP2023049956A (en)

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Country Status (1)

Country Link
JP (1) JP2023049956A (en)

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