JP5708229B2 - How to remove the bush - Google Patents

How to remove the bush Download PDF

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JP5708229B2
JP5708229B2 JP2011110090A JP2011110090A JP5708229B2 JP 5708229 B2 JP5708229 B2 JP 5708229B2 JP 2011110090 A JP2011110090 A JP 2011110090A JP 2011110090 A JP2011110090 A JP 2011110090A JP 5708229 B2 JP5708229 B2 JP 5708229B2
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bush
housing
bolt
tap
screw
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JP2012240134A (en
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春男 西岡
春男 西岡
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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Description

本発明はブッシュの抜き取り方法に関し、ハウジングに嵌合された薄い肉厚の例えば０．５ｍｍ〜２．０ｍｍ程度のブッシュをハウジングを損傷することなく容易に抜き取ることができるようにしたもので、特に搬送用チェーンの多数のローラリンクのブッシュの抜き取りなどに好適なものである。   The present invention relates to a method for extracting a bush, which is a thin walled bush fitted to a housing, for example, about 0.5 mm to 2.0 mm, which can be easily extracted without damaging the housing. It is suitable for extracting bushes of a large number of roller links of the conveying chain.

各種の装置や機械器具の軸体の回転部分や摺動部分の支持にブッシュが用いられ、ハウジングの穴に嵌合して使用されており、例えば、図４に示すように、搬送用チェーンのローラリンクＲにもブッシュＢが嵌合されている。
このようなブッシュＢに摩耗や破損が生じた場合、あるいは予め定めた時間が経過した場合の精度の維持のために、ブッシュＢを交換することが行われる。 Bush is used to support the rotating part and sliding part of the shafts of various devices and machinery and is used by fitting into holes in the housing. For example, as shown in FIG. A bush B is also fitted to the roller link R.
In order to maintain accuracy when such bush B is worn or damaged, or when a predetermined time has elapsed, the bush B is replaced.

このようなハウジングＨの穴ａに嵌合されたブッシュＢを抜く方法としては、例えば、図５に示すように、ハウジングＨのブッシュＢと反対側から硬い棒状の素材ｂをブッシュＢに当て、ハンマーｃで叩いて力を加えて抜き取る方法があるが、ハウジングＨの穴ａの直径に合わせた棒状素材ｂによって穴ａの内周面に傷をつけてしまい、ブッシュ交換後の回転や摺動の精度を狂わせる怖れがある。   As a method of removing the bush B fitted in the hole a of the housing H, for example, as shown in FIG. 5, a hard rod-shaped material b is applied to the bush B from the opposite side to the bush B of the housing H, There is a method of applying a force by pulling it with a hammer c, but the rod-shaped material b matched to the diameter of the hole a of the housing H damages the inner peripheral surface of the hole a, and rotation and sliding after bush replacement There is a fear of madness of accuracy.

そこで、専用の工具として、例えば、図６に示すように、ブッシュプーラー１００を用意し、ブラケット１０１をハウジングＨに設置し、昇降ブロック１０２の複数の係止爪１０３，１０３をブッシュＢの内径段差部に係止し、昇降ブロック１０２の昇降用のナット１０４にねじ込まれたガイドボルト１０５を回転することによってブッシュＢをハウジングＨの穴ａから引き抜くことが提案されている(特許文献1参照)。   Therefore, as a dedicated tool, for example, as shown in FIG. 6, a bush puller 100 is prepared, the bracket 101 is installed in the housing H, and the plurality of locking claws 103, 103 of the elevating block 102 are connected to the inner diameter step of the bush B. It is proposed that the bush B is pulled out from the hole a of the housing H by rotating the guide bolt 105 that is locked to the portion and screwed into the lifting nut 104 of the lifting block 102 (see Patent Document 1).

さらに、専用工具１１０として、例えば、図７に示すように、ハウジングＨに設置されるカラーリング１１１にねじ機構１１２で昇降する本体１１３を設け、この本体１１３の先端部のタップ部分１１４でブッシュＢの内径部分にねじ溝を形成しながらねじ込んでおき、本体１１３をねじ機構１１２で回転することによってブッシュＢをハウジングＨの穴ａから引き抜くことが提案されている(特許文献２参照)。   Further, as the dedicated tool 110, for example, as shown in FIG. 7, a main body 113 that moves up and down by a screw mechanism 112 is provided on a color ring 111 installed in a housing H, and a bush B is formed by a tap portion 114 at the tip of the main body 113. It is proposed that the bush B is pulled out from the hole a of the housing H by screwing while forming a thread groove in the inner diameter portion of the housing and rotating the main body 113 by the screw mechanism 112 (see Patent Document 2).

実公平１−３７７７９号公報No. 1-337779 特開昭６３−２３２９８３号公報JP-A-63-2322983

ところが、特許文献１に開示されたブッシュプーラー１００を用いることで通常のブッシュＢは抜き取ることができるものの、特に肉厚が１ｍｍ程度の薄肉のブッシュＢの場合には、係止爪１０３，１０３の引っ掛かり部分が少なく、引き抜くための充分な力を伝えることができないばかりか、ハウジングＨの穴ａの内周面を引っ掻いてしまい、傷をつけてブッシュ交換後の回転や摺動の精度を狂わせる怖れがあるという問題がある。
さらに、ローラリンクＲの場合のように、薄肉ブッシュＢがハウジングＨの穴ａの全長に嵌合されずに、段差部ｄを形成して段差部ｄに突き当たるまで薄肉ブッシュＢが嵌合されている場合には、一層ブッシュＢに引き抜くための力を伝え難いという問題がある。
また、特許文献２では、タップ部分１１４を備えた専用工具１１０を用いる場合に、タップ部分１１４によるねじの切り始めにブッシュＢに対し専用工具１１０のタップ部分１１４が斜めに食いつき易く、このままねじを形成すると、ブッシュＢが螺旋状に破断し、ブッシュＢを抜き辛くなるとともに、破断したブッシュＢのバリでハウジングＨの穴ａの内周面を傷つけてしまうという問題がある。 However, although the normal bush B can be removed by using the bush puller 100 disclosed in Patent Document 1, in the case of a thin bush B having a thickness of about 1 mm, the locking claws 103 and 103 are not provided. There are few catching parts, and not only can not transmit enough force to pull out, but it also scratches the inner peripheral surface of the hole a of the housing H, and scars may damage the accuracy of rotation and sliding after replacing the bush There is a problem that there is.
Further, as in the case of the roller link R, the thin bush B is not fitted to the entire length of the hole a of the housing H, but the thin bush B is fitted until the stepped portion d is formed and hits the stepped portion d. If there is, there is a problem that it is difficult to transmit the force for pulling out the bush B further.
Further, in Patent Document 2, when the dedicated tool 110 having the tap portion 114 is used, the tap portion 114 of the dedicated tool 110 tends to bite diagonally against the bush B at the beginning of thread cutting by the tap portion 114, and the screw is used as it is. When formed, the bush B breaks spirally, making it difficult to pull out the bush B, and the burrs of the broken bush B damage the inner peripheral surface of the hole a of the housing H.

発明は、かかる従来技術の問題点に鑑みてなされたもので、肉厚が０．５ｍｍ〜２．０ｍｍ程度の薄肉のブッシュであってもハウジングから抜き取ることができ、作業者の熟練度に依ることなくハウジングの穴内周面の交換後の精度を損なわずに、容易に抜き取ることができるブッシュの抜き取り方法を提供しようとするものである。   The invention has been made in view of the problems of the prior art, and even a thin bush having a thickness of about 0.5 mm to 2.0 mm can be removed from the housing, and depends on the skill level of the operator. Therefore, an object of the present invention is to provide a method for extracting a bush that can be easily extracted without impairing the accuracy after replacement of the inner peripheral surface of the hole of the housing.

前記課題を解決するため、発明の請求項１に記載のブッシュの抜き取り方法は、ハウジングに嵌合されたブッシュを抜き取るに際し、前記ブッシュの内径と略同径のガイド部を先端に備え、前記ブッシュにねじを切るねじ切り部を備えたタップに、前記ハウジングに当てることで、前記ブッシュの肉厚以下のねじ溝深さに規制する規制カラーを取り付け、ハウジングに嵌合された前記ブッシュに前記タップのガイド部を差し込んで、前記規制カラーで規制されるまで当該タップを回転してブッシュの肉厚以下の深さのねじ溝を形成した後、このブッシュのねじ溝にハウジング外方からボルトをねじ込んで装着し、次いで、ハウジングの前記ボルト装着側と反対の外方からブッシュ内に抜き出し用ロッドを挿入して前記ボルトの先端面に当て、この抜き出し用ロッドを介して前記ボルトごと前記ブッシュを抜き取ることを特徴とするものである。   In order to solve the above-mentioned problem, a method for extracting a bush according to claim 1 of the present invention is provided with a guide portion having a diameter substantially the same as the inner diameter of the bush at the tip when the bush fitted to the housing is extracted. By attaching to the housing a tap provided with a threaded portion for threading a screw, a regulation collar for regulating the thread groove depth below the wall thickness of the bush is attached, and the bush of the tap fitted to the housing is attached. Insert the guide part and rotate the tap until it is regulated by the regulation collar to form a screw groove with a depth less than the thickness of the bush, and then screw the bolt into the bush groove groove from the outside of the housing. Next, insert the extraction rod into the bush from the outside opposite to the bolt mounting side of the housing and hit the tip end surface of the bolt, Through the extraction rod of the is characterized in that extracting the bush by said bolt.

本発明の請求項２に記載のブッシュの抜き取り方法は、請求項１記載の構成に加え、前記ボルトのねじ山高さを、前記タップのねじ溝深さに合わせたテーパ状に形成して、ブッシュのねじ溝にねじ込むことを特徴とするものである。  According to a second aspect of the present invention, there is provided a bush extraction method, wherein, in addition to the configuration of the first aspect, the screw thread height of the bolt is formed in a taper shape matching the thread groove depth of the tap. It is characterized by being screwed into the screw groove.

本発明の請求項１に記載のブッシュの抜き取り方法によれば、ハウジングに嵌合されたブッシュを抜き取るに際し、タップの先端のガイド部をブッシュに差し込むことで、垂直度を高めた状態にし、その後ねじを切り始めることで、ブッシュを損傷することなくねじ溝を形成することができる。また、タップのねじ切り部に規制カラーを取り付けてハウジングに当たるまでねじを切ることで、ブッシュの肉厚以下のねじ溝を形成することができ、熟練度に依らず、ハウジングの穴内周面に傷をつけずに短時間にねじを切ることができる。
さらに、ブッシュに形成されたねじにボルトをねじ込み、反対側から抜き出し用ロッドを当てて押出すことで、ボルトを介してブッシュに十分な力を伝えて抜き取ることができる。 According to the bush extraction method of the first aspect of the present invention, when extracting the bush fitted to the housing, the guide portion at the tip of the tap is inserted into the bush, thereby increasing the perpendicularity. By starting to cut the screw, the thread groove can be formed without damaging the bush. Also, by attaching a restriction collar to the threaded part of the tap and cutting the screw until it hits the housing, a thread groove with a thickness less than the thickness of the bush can be formed, and the inner peripheral surface of the hole in the housing is damaged regardless of the level of skill. The screw can be cut in a short time without attaching.
Furthermore, a bolt is screwed into a screw formed on the bush, and a rod for extraction is applied from the opposite side and pushed out, whereby a sufficient force can be transmitted to the bush via the bolt and extracted.

本発明の請求項２に記載のブッシュの抜き取り方法によれば、ボルトをねじ込んでもブッシュのねじ溝の損傷、或いはその外周のハウジングの損傷を防止して、ブッシュごとハウジングから抜き取ることができる。  According to the bush extraction method of the present invention, even if the bolt is screwed in, the bushing groove or the outer housing can be prevented from being damaged, and the bush can be extracted from the housing.

本発明のブッシュの抜き取り方法の一実施形態に用いる工具にかかる正面図、右側面図およびボルトの正面図である。It is the front view concerning the tool used for one Embodiment of the extraction method of the bush of this invention, the right view, and the front view of a volt | bolt. 本発明のブッシュの抜き取り方法の一実施形態にかかる工程説明図である。It is process explanatory drawing concerning one Embodiment of the extraction method of the bush of this invention. 本発明のブッシュの抜き取り方法の一実施形態にかかる工程説明図である。It is process explanatory drawing concerning one Embodiment of the extraction method of the bush of this invention. 本発明のブッシュの抜き取り方法の適用対象の１例にかかる搬送用チェーンのローラリンクの一部分を拡大して示す断面図である。It is sectional drawing which expands and shows a part of roller link of the conveyance chain concerning one example of the application object of the bush extraction method of this invention. 従来のブッシュの抜き取り方法を説明する断面図である。It is sectional drawing explaining the extraction method of the conventional bush. 従来のブッシュの抜き取り方法に用いるブッシュプーラーの断面図である。It is sectional drawing of the bush puller used for the extraction method of the conventional bush. 従来のブッシュの抜き取り方法に用いる専用工具の断面図である。It is sectional drawing of the exclusive tool used for the extraction method of the conventional bush.

以下、本発明の一実施の形態について、図面に基づき詳細に説明する。
本発明のブッシュの抜き取り方法は、肉厚が０．５ｍｍから２．０ｍｍ程度の薄肉のブッシュBを抜き取り対象とするものであり、例えば図４で説明した搬送用チェーンのローラリンクRのブッシュＢを挙げることができ、特にハウジングHの穴ａに形成された段差部ｄに突き当たるまでブッシュＢが嵌合されている場合に好適である。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
The bush extraction method of the present invention is intended to extract a thin bush B having a thickness of about 0.5 mm to 2.0 mm. For example, the bush B of the roller link R of the conveyance chain described in FIG. This is particularly suitable when the bush B is fitted to the stepped portion d formed in the hole a of the housing H.

本発明のブッシュの抜き取り方法においては、図１に示すように、抜き取り用工具１０が用いられ、タップ１１の先端に、ブッシュＢの内径と略同径の円柱状のガイド部１２が一体に形成されるとともに、ねじ切り部１３が設けられ、ブッシュＢの肉厚部分にねじ溝を切ることができるものが使用される。そして、タップ１１のねじ切り部１３は、先端が細く次第に太くなるテーパ状であり、ストッパーとして規制カラー１４をねじ切り部１３にボルト１５で締め付けて取り付けてある。
そして、タップ１１のねじ切り部１３によってブッシュＢにねじ溝が切られるが、そのねじ溝は、ねじ切り部１３が回転して進むに従って深くなり、ブッシュＢの肉厚部分を越えて、ハウジングＨまでねじ溝が形成される怖れがあるが、ストッパーとしての規制カラー１４がハウジングＨに当たり、タップ１１の回転を停止して形成されるブッシュＢのねじ溝深さを前記ブッシュＢの肉厚以下に規制する。ブッシュＢのねじ溝深さは、ブッシュＢが破断しないように前記ブッシュＢの肉厚よりも０．２ｍｍ以下であることが好ましい。 In the bush extraction method of the present invention, as shown in FIG. 1, an extraction tool 10 is used, and a cylindrical guide portion 12 having the same diameter as the inner diameter of the bush B is integrally formed at the tip of the tap 11. In addition, a threaded portion 13 is provided, and a threaded groove can be cut in the thick portion of the bush B. The threaded portion 13 of the tap 11 has a tapered shape with a thin tip and gradually thickens, and a restriction collar 14 is fastened to the threaded portion 13 with a bolt 15 as a stopper.
Then, the thread groove 13 is cut in the bush B by the threaded portion 13 of the tap 11, and the thread groove becomes deeper as the threaded portion 13 rotates and advances to the housing H beyond the thick portion of the bush B. There is a fear that a groove is formed, but the restriction collar 14 as a stopper hits the housing H, and the thread groove depth of the bush B formed by stopping the rotation of the tap 11 is restricted to the thickness of the bush B or less. To do. The depth of the thread groove of the bush B is preferably 0.2 mm or less than the thickness of the bush B so that the bush B is not broken.

また、本発明のブッシュの抜き取り方法においては、図１(ｃ)に示すように、前述したねじ溝にねじ込むボルト１６が用意され、ブッシュＢに形成したねじ溝にねじ込まれる。
さらに、本発明のブッシュの抜き取り方法においては、図３に示すように、ブッシュＢに形成したねじ溝にねじ込んだボルト１６を、ハウジングＨの反対側から押し出すため、例えば外径がブッシュＢの内径より小さい円柱体に頭部が一体に形成されたボルト状の抜き出し用ロッド１７が用意される。 In the bush extraction method of the present invention, as shown in FIG. 1C, the bolt 16 to be screwed into the above-described screw groove is prepared and screwed into the screw groove formed in the bush B.
Furthermore, in the method of extracting the bush of the present invention, as shown in FIG. 3, the bolt 16 screwed into the thread groove formed in the bush B is pushed out from the opposite side of the housing H. A bolt-shaped extraction rod 17 having a head formed integrally with a smaller cylindrical body is prepared.

次に、抜き取り用工具１０を用いた本発明のブッシュの抜き取り方法について、図２および図３により具体的に説明する。
まず、ハウジングＨの穴ａに嵌合されているブッシュＢに、その内径に適合するガイド部１２を先端に有する抜き取り用工具１０を差し込んで垂直度を確保し、この垂直状態を維持してタップ１１を回転してねじ切りを開始する(図２(ａ)参照)。
この後、タップ１１を回転してねじ切りを進め、規制カラー１４がハウジングＨに当たるまでねじ切りを行い、例えば７〜１０山程度のねじ溝を形成する（図２(ｂ)参照）。
こうすることで、薄肉のブッシュＢでも熟練を要さず、ハウジングＨの穴ａの内周面に傷をつけることもなく、短時間でブッシュＢの肉厚部分に精度良くねじ溝を形成することができる。
次いで、ブッシュＢに形成したねじ溝にボルト１６をねじ込んで装着する（図２(ｃ)参照）。 Next, the bush extraction method of the present invention using the extraction tool 10 will be specifically described with reference to FIGS.
First, a vertical tool is secured by inserting a removal tool 10 having a guide portion 12 that fits the inner diameter of the bush B fitted in the hole a of the housing H, and the vertical state is maintained to tap. 11 is rotated to start threading (see FIG. 2A).
Thereafter, the tap 11 is rotated to advance threading, and threading is performed until the restriction collar 14 contacts the housing H, and, for example, about 7 to 10 threads are formed (see FIG. 2B).
In this way, even the thin bush B does not require skill, and the inner peripheral surface of the hole a of the housing H is not damaged, and the thread groove is accurately formed in the thick portion of the bush B in a short time. be able to.
Next, the bolts 16 are screwed into the thread grooves formed in the bush B (see FIG. 2C).

最後に、ボルト１６を装着したブッシュＢと反対側のハウジングＨの外方から、抜き出し用ロッド１７を挿入してボルト１６の先端面に当てた状態とし、図示しないハンドプレスなどを用いて抜き出し用ロッド１７を衝撃を加えることなく押し出してブッシュＢをハウジングＨの穴ａから抜き取る（図３参照）。   Finally, from the outside of the housing H on the opposite side of the bush B to which the bolt 16 is mounted, the extraction rod 17 is inserted and brought into contact with the front end surface of the bolt 16 and is extracted using a hand press (not shown). The rod 17 is pushed out without applying an impact, and the bush B is extracted from the hole a of the housing H (see FIG. 3).

以上のような工程を経ることで、ハウジングＨの穴ａの段差部ｄに突き当たるまで嵌合された薄肉のブッシュＢであっても、衝撃を加えることなく容易に抜き取ることができる。
これにより、ハウジングＨからブッシュＢを抜き取る際に、ハウジングＨの穴ａの内周面を損傷することがなく、ブッシュＢを交換した後も、交換前と同様に高精度に回転や摺動を維持することができる。
したがって、例えばプリフォームをブロー成形する前の加熱工程で、プリフォームを搬送する回転軸を支持する搬送チェーンに埋め込まれたブッシュを定期的に交換する場合にも、ハウジングに損傷を与えることなくブッシュを抜き取って交換することができ、１度に交換する数が大量で、しかも、ブッシュ交換後の回転軸の回転や摺動の精度が要求される場合でも、短時間に交換でき、コスト削減を図ることができる。 Through the above-described steps, even the thin bush B fitted until it hits the stepped portion d of the hole a of the housing H can be easily extracted without applying an impact.
As a result, when the bush B is extracted from the housing H, the inner peripheral surface of the hole a of the housing H is not damaged, and the bush B can be rotated and slid with high accuracy in the same manner as before the replacement. Can be maintained.
Therefore, for example, when the bush embedded in the conveying chain that supports the rotating shaft that conveys the preform is periodically replaced in the heating process before the preform is blow-molded, the bushing is not damaged. Even if a large number of parts are exchanged at a time and the accuracy of rotation and sliding of the rotating shaft after bush replacement is required, it can be exchanged in a short time, reducing costs. Can be planned.

なお、前記の実施形態では、ローラリンクＲの片側の１個のブッシュを抜き取る場合を例に説明したが、片側の２つのブッシュを抜き取るようにしても良く、こうすることで抜き出し用ロッドによる押出しの際の押出し力が集中せず、ローラリンクＲのハウジングに分散させて支持することができる。   In the above-described embodiment, the case where one bush on one side of the roller link R is extracted has been described as an example. However, two bushes on one side may be extracted. In this case, the extrusion force is not concentrated and can be dispersed and supported in the housing of the roller link R.

１０ 抜き取り用工具
１１ タップ
１２ ガイド部
１３ ねじ切り部
１４ 規制カラー
１５ ボルト
１６ ボルト
１７ 抜き出し用ロッド
Ｂ ブッシュ
Ｈ ハウジング
ａ 穴
ｄ 段差部 DESCRIPTION OF SYMBOLS 10 Tool for extraction 11 Tap 12 Guide part 13 Thread cutting part 14 Restriction collar 15 Bolt 16 Bolt 17 Extraction rod B Bushing H Housing a Hole d Stepped part

Claims (2)

ハウジングに嵌合されたブッシュを抜き取るに際し、
前記ブッシュの内径と略同径のガイド部を先端に備え、前記ブッシュにねじを切るねじ切り部を備えたタップに、前記ハウジングに当てることで前記ブッシュの肉厚以下のねじ溝深さに規制する規制カラーを取り付け、
ハウジングに嵌合された前記ブッシュに前記タップのガイド部を差し込んで前記規制カラーで規制されるまで当該タップを回転して、ブッシュの肉厚以下の深さのねじ溝を形成した後、このブッシュのねじ溝にハウジング外方からボルトをねじ込んで装着し、次いで、ハウジングの前記ボルト装着側と反対の外方からブッシュ内に抜き出し用ロッドを挿入して前記ボルトの先端面に当て、この抜き出し用ロッドを介して前記ボルトごと前記ブッシュを抜き取ることを特徴とするブッシュの抜き取り方法。 When removing the bush fitted in the housing,
A guide portion having a diameter substantially the same as the inner diameter of the bush is provided at the tip, and a tap having a threaded portion for cutting a screw in the bush is applied to the housing to regulate the thread groove depth to be equal to or less than the thickness of the bush. Install the regulation collar,
After inserting the guide portion of the tap into the bush fitted to the housing and rotating the tap until it is regulated by the regulation collar, a screw groove having a depth less than the thickness of the bush is formed, and then the bush. Screw the bolt into the screw groove from the outside of the housing, then insert the extraction rod into the bush from the outside opposite the bolt mounting side of the housing and hit the tip of the bolt. A method for extracting a bush, wherein the bush is extracted together with the bolt via a rod. 前記ボルトのねじ山高さを、前記タップのねじ溝深さに合わせたテーパ状に形成して、ブッシュのねじ溝にねじ込むことを特徴とする請求項１記載のブッシュの抜き取り方法。  The bush extraction method according to claim 1, wherein the thread height of the bolt is formed in a taper shape matching the thread groove depth of the tap and screwed into the thread groove of the bush.
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WO2018038728A1 (en) * 2016-08-25 2018-03-01 Halliburton Energy Services, Inc. Two=piece guide bushing
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Publication number Priority date Publication date Assignee Title
WO2018038728A1 (en) * 2016-08-25 2018-03-01 Halliburton Energy Services, Inc. Two=piece guide bushing
US11059154B2 (en) 2016-08-25 2021-07-13 Halliburton Energy Services, Inc. Two-piece guide bushing
US11543041B2 (en) 2016-08-25 2023-01-03 Halliburton Energy Services, Inc. Two-piece guide bushing

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