JP2004226296A

JP2004226296A - Inside diameter measuring instrument

Info

Publication number: JP2004226296A
Application number: JP2003015886A
Authority: JP
Inventors: Kunio Tomita; 邦夫冨田
Original assignee: Musashi Seimitsu Industry Co Ltd
Current assignee: Musashi Seimitsu Industry Co Ltd
Priority date: 2003-01-24
Filing date: 2003-01-24
Publication date: 2004-08-12
Anticipated expiration: 2023-01-24
Also published as: JP3918737B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inside diameter measuring instrument for accurately measuring an inside diameter regardless of an inside shape of an object to be measured and technical skills of a measuring person. <P>SOLUTION: The inside diameter measuring instrument comprises a cylindrical cover body having a space in an inside and extending in axial direction, a measuring head continuous to one end of the cover body, a plurality of probes held in the state that they can be advanced and retreated to a measuring head in a radial direction; a pressuring part having a tapering part contacted on the plurality of the probes on an edge and for radially moving the probe by advancing and retreating in the axial direction, a rod part arranged at a non-taper part side of the cover body, and a rotation part having a function for axially advancing and retreating the rod part on the other end of the cover body. The inside diameter measuring instrument is provided with a fixing part projected axially protruded from the end face to the measuring head. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、カップ状または円筒状で内周面を有する製品の内径を計測する内径測定具に関する。
【０００２】
【従来の技術】
従来の内径測定具には、図８に示される如きものがあった。この内径測定具１０１は、略円筒状のカバー本体１０２と、カバー本体１０２の一方端部に連続しカバー本体１０２より大径の測定ヘッド１０３と、カバー本体１０２の他方端部に螺合する回転部１１１とを備えている。回転部１１１は、第一回転部１１１ａと、第一回転部１１１ａと連動し、周方向に回転部目盛１１２が記載された第二回転部１１１ｂとよりなる。また、カバー本体１０２の他方端部側にはカバー目盛１１０が軸方向に記載されている。測定ヘッド１０３は、円筒形で周方向に一定の間隔をおいて三個の穴部１０５が形成されており、各々の穴部１０５から径方向に移動可能な状態で測定子１０４が保持されていた。
【０００３】
次に上記内径測定具１０１を用いて被測定物の内径を計測する手順を説明する。
【０００４】
図に示される被測定物は、略カップ形状のハウジング１５１である。このハウジング１５１の内側は、軸方向にストレートに伸びるストレート部１５５と、ストレート部１５５に対し直交する水平部を有する底面１５３と、ストレート部１５５と底面１５３とを連結し傾斜するコーナー部１５４とから形成されている。このハウジング１５１の内径を測定する場合は、まずハウジング１５１内に内径測定具１０１を測定ヘッド１０３側から挿入してストレート部１５５と対向した位置に測定ヘッド１０３を停止させる。次いで第一回転部１１１ａを回転させて測定子１０４を径方向外側へ移動させる。これにより測定子１０４は測定ヘッド１０３の穴部１０５から外側へと突出し、ハウジング１５１のストレート部１５５に当接して停止する。その時点で、回転部目盛１１２とカバー目盛１１０とを読み取り、ハウジング１５１の内径を測定していた。
【０００５】
【発明が解決しようとする課題】
上記の如き内径測定具１０１を用いて上記手順でハウジング１５１の内径を測定する場合、測定ヘッド１０３をハウジング１５１内のコーナー部１５４が形成されている位置まで挿入されてしまうと、コーナー部１５４が測定子１０４に干渉し、正確な計測が困難であるということがあった。また、測定者がハウジング１５１の内径測定位置、つまりストレート部１５５と同位置に内径測定具１０１の測定ヘッド１０３を配置しなければならないので、計測の正確さは測定者の技術に負う部分があった。更に内径測定具１０１が傾いた状態でハウジング１５１内に挿入される場合があり、正確な計測が困難であるということがあった。
【０００６】
従って本発明は上述の如き課題を解決し、被測定物の内側形状や測定者の技術に拘わらず、正確に内径を計測できる内径測定具を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明は以下の如き構成である。
【０００８】
１内部に空間を有し軸方向に延びる筒状のカバー本体と、カバー本体の一方端部に連続する測定ヘッドと、測定ヘッドに径方向に進退可能な状態で保持される複数の測定子と、複数の測定子に当接する先細りのテーパ部を先端に有し軸方向に進退することで測定子を径方向に移動させる押圧部と、押圧部の反テーパ部側に配置される棒部と、カバー本体の他方端部に棒部を軸方向に進退させる機能を有する回転部とを備えた内径測定具において、測定ヘッドに、その端面から軸方向に突出する固定部を設ける。
【０００９】
２固定部は測定ヘッド端面から突出する軸方向長さが変更可能である。
【００１０】
３固定部は測定ヘッドから取り外し可能である。
【００１１】
４固定部は略半球形状である。
【００１２】
【実施例】
以下、本発明の実施例を図１乃至図７に基づいて説明する。
【００１３】
図１は本発明の第一の実施例による内径測定具１を表す。この内径測定具１は、略円筒状のカバー本体２と、カバー本体２の一方端部に連続しカバー本体より大径の測定ヘッド３と、測定ヘッド３の端面１５から突出し固定部端面８が水平部を形成する固定部６と、カバー本体２の他方端部に螺合する回転部１１とを備えている。回転部１１は、第一回転部１１ａと、第一回転部１１ａと連動し、周方向に回転部目盛１２が記載された第二回転部１１ｂとよりなる。また、カバー本体２の他方端部側にはカバー目盛１０が軸方向に記載されている。測定ヘッド３は、円筒形で、図２に示す如く周方向に一定の間隔をおいて三個の穴部５が形成されており、各々の穴部５から径方向に移動可能な状態で測定子４が保持されている。
【００１４】
続いて内径測定具１の内部構造について図３を基に説明する。カバー本体２の内側の径方向略中央部には軸方向に進退可能である棒部１３を備えている。そして、カバー本体２の測定ヘッド３側には、棒部１３と同軸上に先端が先細りのテーパ部１４ａが形成される押圧部１４が配置されている。測定ヘッド３の内側には押圧部１４のテーパ部１４ａと当接し径方向に移動可能である測定子４が板ばね１６によってテーパ部１４ａに押圧された状態で三個配置されている。また固定部６はカバー本体２側に雄螺子部７が形成され、この雄螺子部７が測定ヘッド３の端面側内周に形成された雌螺子部９に螺合し、測定ヘッド３に固定されている。
【００１５】
次に上記内径測定具１を用いて被測定物の内径を計測する手順を図３及び図４を基に説明する。
【００１６】
図４に示される被測定物は、自動車の懸架装置等の連結部に使用されるボールジョイントの一般的な構成部品の一つである略カップ形状のハウジング５１である。このハウジング５１の内側は、軸方向にストレートに伸びるストレート部５５と、ストレート部５５に対し直交する水平部を有する底面５３と、ストレート部５５と底面５３とを連結し傾斜するコーナー部５４とから形成されている。このハウジング５１の内径、つまり被測定部であるストレート部５５の内径を測定する場合は、まずハウジング５１の開口５２へ内径測定具１を測定ヘッド３側から挿入し、固定部６の固定部端面８をハウジング５１の底面５３の水平部に当接させる。次いで第一回転部１１ａを回転させて棒部１３を測定ヘッド３側に移動させ、押圧部１４に当接させて押圧する。棒部１３と一体的に押圧部１４は測定子４側に移動し、テーパ部１４ａが測定子４を径方向外側へ移動させる。これにより測定子４は測定ヘッド３の孔部５から外側へと突出し、ハウジング５１のストレート部５５に当接して停止する。その時点で、回転部目盛１２とカバー目盛１０とを読み取り、ハウジング５１の内径を測定する。
【００１７】
従って第一の実施例によれば、筒状のカバー本体２と、カバー本体２の一方端部に連続する測定ヘッド３と、測定ヘッド３に径方向に進退可能な状態で保持される複数の測定子４と、複数の測定子４に当接する先細りのテーパ部１４ａを先端に有し軸方向に進退することで測定子４を径方向に移動させる押圧部１４と、押圧部１４の反テーパ部側に配置される棒部１３と、カバー本体２の他方端部に棒部１３を軸方向に進退させる機能を有する回転部１１とを備えた内径測定具１であって、測定ヘッド３に、その端面１５から軸方向に突出する固定部６を設けるので、被測定物の水平部に固定部６を当接させることができ、また内径測定具１の軸心が被測定物の軸心に対して傾くことなく挿入できる。
【００１８】
続いて第二の実施例を図５に基づいて説明する。図５に示される被測定物は、第一の実施例で測定した被測定物であるハウジング５１と比較して、コーナー部６４の傾斜角が大きく形成されているハウジング６１である。このハウジング６１のストレート部６５はハウジング５１のストレート部５５と比較して、底面６３から離れた位置から形成されている。このハウジング６１の内径を第一の実施例で示した内径測定具１にて計測するときは、予め固定部６の雄螺子部７を逆方向に回転させて測定ヘッド３の雌螺子部９から後退させ、測定ヘッド３の端面１５からの軸方向の突出量を増加させる。その後は、第一の実施例の場合と同様に被測定物に挿入し、内径を計測する。
【００１９】
従って第二の実施例によれば、固定部６は測定ヘッド３の端面１５から突出する軸方向長さが変更可能であるので、測定ヘッド３の位置を変更できる。
【００２０】
続いて第三の実施例を図６に基づいて説明する。図６に示される被測定物は、本発明の第二の実施例で示した被測定物であるハウジング６１と比較して、コーナー部７４の傾斜角が大きく形成されているハウジング７１である。このハウジング７１のストレート部７５はハウジング６１のストレート部６５と比較して、底面７３から離れた位置から形成されている。このハウジング７１の内径を第一の実施例で示した内径測定具１にて計測するときは、予め固定部６の雄螺子部７を逆方向に回転させて測定ヘッド３の雌螺子部９から後退させて、固定部６を測定ヘッド３から離脱させる。次いで固定部６と比較して軸方向長さが長い第二固定部２６の雄螺子部を測定ヘッド３の雌螺子部と螺合させ、測定へッド３に第二固定部２６を固定する。その後は、第一の実施例の場合と同様に被測定物に挿入し、内径を計測する。
【００２１】
従って第三の実施例によれば、固定部６は測定ヘッド３から取り外し可能であるので、固定部を交換することができる。
【００２２】
続いて第四の実施例を図７に基づいて説明する。図７に示される内径測定具３１は殆どの構造が内径測定具１と同一であるので、異なる部分のみを説明する。この内径測定具３１の固定部３６は、略半球形状である。
【００２３】
従って第四の実施例によれば、固定部３６が略半球形状であるので、被測定物の底面の水平部とは点接触となる。
【００２４】
尚、上記実施例では被測定物としてカップ形状のハウジングを使用したため水平部が被測定物の底面に形成されたが、被測定物が円筒形状である場合は、被測定物を載置する治具などに水平部を形成し、円筒状の被測定物が載置された治具などの水平部をカップ状の被測定物の底面に形成された水平部と同様に見なして、内径測定具を用いて内径を計測することができる。
【００２５】
【発明の効果】
以上のように本発明によれば、内部に空間を有し軸方向に延びる筒状のカバー本体と、カバー本体の一方端部に連続する測定ヘッドと、測定ヘッドに径方向に進退可能な状態で保持される複数の測定子と、複数の測定子に当接する先細りのテーパ部を先端に有し軸方向に進退することで測定子を径方向に移動させる押圧部と、押圧部の反テーパ部側に配置される棒部と、カバー本体の他方端部に棒部を軸方向に進退させる機能を有する回転部とを備えた内径測定具において、測定ヘッドに、その端面から軸方向に突出する固定部を設けるので、被測定物の被測定物と内径又は形状の異なる異形部が形成されていても、異形部に干渉されることなく、内径を計測することができる。また、固定部により測定ヘッドが配置される位置が決まるので、測定者の技術に拘わらず一定の箇所で測定できる。更に内径測定具の軸芯が被測定物の軸芯に対して傾くことなく挿入できるので、内径測定具が被測定物に対して傾くことがないため、正確に内径を計測できる。
【００２６】
また、固定部は測定ヘッド端面から突出する軸方向長さが変更可能であると、被測定物の内周面の大きさや形状に合わせて測定ヘッドの位置を変更できるので、同一の内径測定具を用いて内周形状の異なる被測定物の内径を所定の位置で計測することができる。
【００２７】
更に、固定部は測定ヘッドから取り外し可能であると、被測定物の大きさや内周形状に合わせて固定部を交換することができるので、より広い範囲の被測定物の内径を固定部を交換するだけで同一の内径測定具で計測することができる。
【００２８】
更に加えて、固定部は略半球形状であると、固定部を当接させる水平部に点接触で固定できるので、計測時における水平部が狭くても、固定部を水平部に固定できるので、正確に計測できる。
【図面の簡単な説明】
【図１】本発明の第一の実施例による内径測定具を表す正面図である。
【図２】本発明の第一の実施例による内径測定具を表す底面図である。
【図３】本発明の第一の実施例による内径測定具における図２のＡ−Ａ一部断面図である。
【図４】本発明の第一の実施例による内径測定具による被測定物の計測状態を表す部分断面正面図である。
【図５】本発明の第二の実施例による内径測定具による被測定物の計測状態を表す部分断面正面図である。
【図６】本発明の第三の実施例による内径測定具による被測定物の計測状態を表す部分断面正面図である。
【図７】本発明の第四の実施例による内径測定具を表す正面図である。
【図８】従来の内径測定具による被測定物の計測状態を表す部分断面正面図である。
【符号の説明】
１内径測定具
２カバー本体
３測定ヘッド
４測定子
６固定部
１１回転部
１３棒部
１４テーパ部
１５（測定ヘッド）端面
３６固定部[0001]
[Industrial applications]
The present invention relates to an inner diameter measuring instrument for measuring the inner diameter of a cup-shaped or cylindrical product having an inner peripheral surface.
[0002]
[Prior art]
FIG. 8 shows a conventional inner diameter measuring instrument. The inner diameter measuring device 101 includes a substantially cylindrical cover main body 102, a measuring head 103 which is continuous with one end of the cover main body 102 and has a larger diameter than the cover main body 102, and a rotation which is screwed to the other end of the cover main body 102. A part 111. The rotating section 111 includes a first rotating section 111a and a second rotating section 111b interlocked with the first rotating section 111a and having a rotating section scale 112 described in a circumferential direction. A cover scale 110 is provided on the other end of the cover body 102 in the axial direction. The measuring head 103 is cylindrical and has three holes 105 formed at regular intervals in the circumferential direction. The measuring element 104 is held in a state where it can be moved in the radial direction from each hole 105. Was.
[0003]
Next, a procedure for measuring the inner diameter of the measured object using the inner diameter measuring tool 101 will be described.
[0004]
An object to be measured shown in the figure is a substantially cup-shaped housing 151. The inside of the housing 151 includes a straight portion 155 extending straight in the axial direction, a bottom surface 153 having a horizontal portion orthogonal to the straight portion 155, and a corner portion 154 connecting and inclining the straight portion 155 and the bottom surface 153. Is formed. When measuring the inner diameter of the housing 151, first, the inner diameter measuring tool 101 is inserted into the housing 151 from the measuring head 103 side, and the measuring head 103 is stopped at a position facing the straight portion 155. Next, the first rotating part 111a is rotated to move the tracing stylus 104 radially outward. As a result, the tracing stylus 104 protrudes outward from the hole 105 of the measuring head 103 and abuts against the straight portion 155 of the housing 151 to stop. At that time, the rotary scale 112 and the cover scale 110 were read, and the inner diameter of the housing 151 was measured.
[0005]
[Problems to be solved by the invention]
When the inner diameter of the housing 151 is measured by the above procedure using the inner diameter measuring tool 101 as described above, if the measuring head 103 is inserted into the housing 151 at a position where the corner 154 is formed, the corner 154 is formed. Interference with the tracing stylus 104 may make accurate measurement difficult. Further, since the measurer must arrange the measuring head 103 of the inner diameter measuring instrument 101 at the inner diameter measuring position of the housing 151, that is, at the same position as the straight portion 155, the accuracy of the measurement depends on the skill of the measurer. Was. Further, there is a case where the inner diameter measuring tool 101 is inserted into the housing 151 in a state where the inner diameter measuring tool 101 is inclined, so that accurate measurement is sometimes difficult.
[0006]
Accordingly, it is an object of the present invention to solve the above-described problems and to provide an inner diameter measuring instrument capable of accurately measuring an inner diameter irrespective of an inner shape of an object to be measured or a technique of a measurer.
[0007]
[Means for Solving the Problems]
The present invention has the following configuration.
[0008]
1. A cylindrical cover main body having a space inside and extending in the axial direction, a measuring head continuous to one end of the cover main body, and a plurality of tracing styluses held by the measuring head so as to be able to advance and retreat in a radial direction. A pressing portion that has a tapered tapered portion at the tip that comes into contact with a plurality of measuring elements and moves the measuring element in the radial direction by moving forward and backward in the axial direction, and a rod portion disposed on the anti-tapered portion side of the pressing portion. In the inner diameter measuring tool having a rotating portion having a function of moving the rod portion in the axial direction at the other end of the cover body, the measuring head is provided with a fixing portion projecting in the axial direction from the end face.
[0009]
2. The length of the fixing portion in the axial direction protruding from the end face of the measuring head can be changed.
[0010]
3 The fixing part is removable from the measuring head.
[0011]
4 The fixing part is substantially hemispherical.
[0012]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0013]
FIG. 1 shows an inner diameter measuring instrument 1 according to a first embodiment of the present invention. The inner diameter measuring device 1 has a substantially cylindrical cover body 2, a measuring head 3 that is continuous with one end of the cover body 2, and has a larger diameter than the cover body, and protrudes from an end face 15 of the measuring head 3 and has a fixed section end face 8. It has a fixed part 6 forming a horizontal part and a rotating part 11 screwed to the other end of the cover body 2. The rotating part 11 includes a first rotating part 11a and a second rotating part 11b which is linked with the first rotating part 11a and has a rotating part scale 12 described in a circumferential direction. A cover scale 10 is provided on the other end of the cover body 2 in the axial direction. The measuring head 3 has a cylindrical shape and is formed with three holes 5 at regular intervals in the circumferential direction as shown in FIG. The child 4 is held.
[0014]
Next, the internal structure of the inner diameter measuring instrument 1 will be described with reference to FIG. A rod 13 is provided at a substantially central portion in the radial direction inside the cover main body 2 so as to be able to advance and retreat in the axial direction. On the measuring head 3 side of the cover main body 2, a pressing portion 14 having a tapered portion 14 a having a tapered tip is formed coaxially with the rod portion 13. Inside the measuring head 3, three tracing styluses 4 which come into contact with the tapered portion 14a of the pressing portion 14 and are movable in the radial direction are arranged in a state pressed by the tapered portion 14a by the leaf spring 16. The fixing portion 6 has a male screw portion 7 formed on the cover body 2 side, and the male screw portion 7 is screwed into a female screw portion 9 formed on the inner periphery of the end face side of the measuring head 3 and fixed to the measuring head 3. Have been.
[0015]
Next, a procedure for measuring the inner diameter of the measured object using the inner diameter measuring tool 1 will be described with reference to FIGS.
[0016]
An object to be measured shown in FIG. 4 is a substantially cup-shaped housing 51 which is one of the general components of a ball joint used for a connection portion of a suspension device of an automobile or the like. The inside of the housing 51 includes a straight portion 55 extending straight in the axial direction, a bottom surface 53 having a horizontal portion orthogonal to the straight portion 55, and a corner portion 54 connecting and inclining the straight portion 55 and the bottom surface 53. Is formed. When measuring the inner diameter of the housing 51, that is, the inner diameter of the straight portion 55, which is the portion to be measured, first insert the inner diameter measuring tool 1 into the opening 52 of the housing 51 from the measuring head 3 side, and fix the end face of the fixed portion 6 8 is brought into contact with the horizontal portion of the bottom surface 53 of the housing 51. Next, the rod 13 is moved to the measuring head 3 side by rotating the first rotating part 11 a, and is pressed against the pressing part 14. The pressing part 14 moves to the tracing stylus 4 side integrally with the rod part 13, and the tapered part 14 a moves the tracing stylus 4 radially outward. As a result, the tracing stylus 4 protrudes outward from the hole 5 of the measuring head 3 and comes into contact with the straight portion 55 of the housing 51 to stop. At that time, the rotary scale 12 and the cover scale 10 are read, and the inner diameter of the housing 51 is measured.
[0017]
Therefore, according to the first embodiment, a cylindrical cover main body 2, a measurement head 3 continuous to one end of the cover main body 2, and a plurality of measurement heads 3 held in a state capable of moving forward and backward in the radial direction. A tracing stylus 4, a pressing portion 14 having a tapered taper portion 14 a at the tip which comes into contact with the plurality of tracing styluses 4, and moving the stylus 4 in the radial direction by moving in the axial direction, and an anti-taper of the pressing portion 14. The inner diameter measuring tool 1 includes a rod portion 13 disposed on the side of the inner portion and a rotating portion 11 having a function of moving the rod portion 13 in the axial direction at the other end of the cover body 2. Since the fixing portion 6 which protrudes in the axial direction from the end face 15 is provided, the fixing portion 6 can be brought into contact with the horizontal portion of the object to be measured, and the axis of the inner diameter measuring instrument 1 is adjusted to the axis of the object to be measured. Can be inserted without tilting.
[0018]
Next, a second embodiment will be described with reference to FIG. The object to be measured shown in FIG. 5 is a housing 61 in which a corner portion 64 has a larger inclination angle than the housing 51 which is the object to be measured measured in the first embodiment. The straight portion 65 of the housing 61 is formed at a position farther from the bottom surface 63 than the straight portion 55 of the housing 51. When the inner diameter of the housing 61 is measured by the inner diameter measuring tool 1 shown in the first embodiment, the male screw 7 of the fixing part 6 is rotated in the reverse direction in advance, and the female screw 9 of the measuring head 3 is rotated. The measurement head 3 is retracted, and the amount of protrusion in the axial direction from the end face 15 of the measurement head 3 is increased. After that, as in the first embodiment, it is inserted into the object to be measured, and the inner diameter is measured.
[0019]
Therefore, according to the second embodiment, since the length of the fixing portion 6 in the axial direction protruding from the end face 15 of the measuring head 3 can be changed, the position of the measuring head 3 can be changed.
[0020]
Next, a third embodiment will be described with reference to FIG. An object to be measured shown in FIG. 6 is a housing 71 in which a corner 74 has a larger inclination angle than the housing 61 which is the object to be measured shown in the second embodiment of the present invention. The straight portion 75 of the housing 71 is formed at a position farther from the bottom surface 73 than the straight portion 65 of the housing 61. When the inner diameter of the housing 71 is measured by the inner diameter measuring instrument 1 shown in the first embodiment, the male screw 7 of the fixing part 6 is rotated in the reverse direction in advance and the female screw 9 of the measuring head 3 is rotated. By retracting, the fixing unit 6 is separated from the measuring head 3. Next, the male screw part of the second fixing part 26 having a longer axial length than the fixing part 6 is screwed with the female screw part of the measuring head 3, and the second fixing part 26 is fixed to the measuring head 3. . After that, as in the first embodiment, it is inserted into the object to be measured, and the inner diameter is measured.
[0021]
Therefore, according to the third embodiment, since the fixing part 6 is detachable from the measuring head 3, the fixing part can be replaced.
[0022]
Next, a fourth embodiment will be described with reference to FIG. Since the inner diameter measuring instrument 31 shown in FIG. 7 has almost the same structure as the inner diameter measuring instrument 1, only different portions will be described. The fixing portion 36 of the inner diameter measuring tool 31 has a substantially hemispherical shape.
[0023]
Therefore, according to the fourth embodiment, since the fixing portion 36 has a substantially hemispherical shape, point contact is made with the horizontal portion on the bottom surface of the measured object.
[0024]
In the above embodiment, the horizontal portion was formed on the bottom surface of the object to be measured because the cup-shaped housing was used as the object to be measured. However, when the object to be measured has a cylindrical shape, the mounting of the object to be measured is performed. A horizontal part is formed on a fixture, etc., and a horizontal part such as a jig on which a cylindrical DUT is placed is regarded as a horizontal part formed on the bottom of a cup-shaped DUT. Can be used to measure the inner diameter.
[0025]
【The invention's effect】
As described above, according to the present invention, a cylindrical cover main body having a space therein and extending in the axial direction, a measuring head continuous to one end of the cover main body, and a state in which the measuring head can reciprocate in the radial direction. A plurality of tracing styluses held by a pressing portion, which has a tapered taper portion at the tip which comes into contact with the plurality of tracing styluses, and which moves the measuring stylus in the radial direction by moving in the axial direction, and an anti-taper of the pressing portion. In the inner diameter measuring device having a rod portion disposed on the side of the portion and a rotating portion having a function of moving the rod portion in the axial direction at the other end of the cover body, the measuring head projects axially from the end face thereof. Since the fixed portion is provided, even if a deformed portion having a different inner diameter or shape from the measured object is formed, the inner diameter can be measured without interference with the deformed portion. In addition, since the position where the measuring head is arranged is determined by the fixing portion, the measurement can be performed at a fixed location regardless of the skill of the measurer. Furthermore, since the axis of the inner diameter measuring tool can be inserted without tilting with respect to the axis of the object to be measured, the inner diameter measuring instrument does not tilt with respect to the object to be measured, so that the inner diameter can be accurately measured.
[0026]
In addition, if the length of the fixed portion protruding from the end face of the measuring head can be changed, the position of the measuring head can be changed according to the size and shape of the inner peripheral surface of the object to be measured. Can be used to measure the inner diameter of the measured object having a different inner peripheral shape at a predetermined position.
[0027]
Furthermore, if the fixed part can be removed from the measuring head, the fixed part can be replaced according to the size and inner peripheral shape of the object to be measured. The measurement can be performed with the same inner diameter measuring tool just by performing the operation.
[0028]
In addition, when the fixing portion is substantially hemispherical, it can be fixed by point contact to the horizontal portion where the fixing portion abuts, so even if the horizontal portion at the time of measurement is narrow, the fixing portion can be fixed to the horizontal portion. Can be measured accurately.
[Brief description of the drawings]
FIG. 1 is a front view showing an inner diameter measuring device according to a first embodiment of the present invention.
FIG. 2 is a bottom view showing the inner diameter measuring device according to the first embodiment of the present invention.
FIG. 3 is a partial cross-sectional view of the inner diameter measuring device according to the first embodiment of the present invention, taken along the line AA of FIG. 2;
FIG. 4 is a partial cross-sectional front view showing a measurement state of an object to be measured by an inner diameter measuring instrument according to the first embodiment of the present invention.
FIG. 5 is a partial cross-sectional front view showing a measurement state of an object to be measured by an inner diameter measuring instrument according to a second embodiment of the present invention.
FIG. 6 is a partial cross-sectional front view showing a state of measuring an object to be measured by an inner diameter measuring instrument according to a third embodiment of the present invention.
FIG. 7 is a front view showing an inner diameter measuring device according to a fourth embodiment of the present invention.
FIG. 8 is a partial cross-sectional front view showing a state of measuring an object to be measured by a conventional inner diameter measuring instrument.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner diameter measuring tool 2 Cover main body 3 Measuring head 4 Measuring element 6 Fixed part 11 Rotating part 13 Bar part 14 Tapered part 15 (measuring head) end face 36 Fixed part

Claims

A cylindrical cover body (2) having a space therein and extending in the axial direction, a measuring head (3) continuous to one end of the cover body (2), and a radially extending measuring head (3). A plurality of tracing styluses (4) held in a state in which the tracing stylus can be moved, and a tapered tapered portion (14a) abutting on the plurality of tracing styluses (4) at a distal end thereof, and the stylus is moved back and forth in the axial direction. (4) a pressing portion (14) for radially moving the pressing portion (14), a rod (13) arranged on the side of the pressing portion (14) opposite to the taper portion, and the other end of the cover body (2). In the inner diameter measuring tool (1) having a rotating part (11) having a function of moving the rod part (13) in the axial direction, the measuring head (3) protrudes from the end face (15) in the axial direction. An inner diameter measuring instrument provided with a fixing portion (6).

The inner diameter measuring device according to claim 1, wherein the fixing portion (6) has a variable axial length protruding from the measuring head end surface (15).

The inner diameter measuring instrument according to claim 1, wherein the fixing portion is detachable from the measuring head.

4. An inner diameter measuring instrument according to claim 1, wherein said fixing portion has a substantially hemispherical shape.